Construction SPT

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Master Thesis

Development and Evaluation of a Small Punch

Testing Device

Jan Benjamin Ottosson

Linköping 2010

LIU-IEI-TEK-A–10/00870–SE

Division of Engineering MaterialsDepartment of Management and Engineering (IEI)

Linköpings universitet, SE-581 83 Linköping, Sweden


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Testing Device

Master’s thesis project conducted at

Division of Engineering Materials

Linköpings universitetby



Supervisor and Examiner: Håkan Brodin

Linköping, 10 June, 2010


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Avdelning, Institution

Division, Department

Department of Management and EngineeringDivision of Engineering MaterialsLinköpings universitetS-581 83 Linköping, Sweden

Datum

Date

2010-006-10

Språk

Language

Svenska/Swedish

Engelska/English

Rapporttyp

Report category

Licentiatavhandling

Examensarbete

C-uppsats

D-uppsats

Övrig rapport

URL för elektronisk version

ISBN

—

ISRN


Serietitel och serienummerTitle of series, numbering

ISSN

—

TitelTitle Development and Evaluation of a Small Punch Testing Device

FörfattareAuthor


Sammanfattning

AbstractIn the turbine industry today, thermal barrier coatings are a commonly used, theseare 0.1-2mm thick. So to be able to do some type of mechanical testing to receivematerial data so one can build an opinion regarding the health of the material. Oneneeds a procedure that can work with small specimens and achieve clear resultsthat can be transformed and compared with known data and known procedures.One of those methods is Small Punch Testing.

This thesis describes one way to develop and test a functioning prototype of aSmall Punch Testing device. The thesis includes; the reason it was developed inthe beginning and how it has been developed throughout the decades, also in whichareas the main research is made. It also shortly describes a working procedure inAnsys to get a Finite Element Method [FEM] model working.

This method showed itself as useful, when just a small sample is at hand. Thetrials in this thesis also show that repetitive test can be done with good results

which can be compared with real and FEM analysis data such as σuts.

Inom turbin industrin idag så är keramiska värme barriärer vanligt förekom-mande dessa är normalt 0,1-2mm tjocka. För att kunna utföra mekanisk provningsom grund för att bilda en åsikt om materialets kondition. Så behöver man enmetod som kan åstadkomma tydliga data med små provbitar, Small Punch Test-ing är en av dem.

Den här rapporten beskriver hur man kan gå tillväga för att få en fungerandeprototyp. Den tar upp metodens ursprung och hur den har utvecklats under årtiondena, också mot vad den nuvarande forskningen riktar sig. Den beskriver ävenkort hur man ställer upp en finita element metod [FEM] modell i Ansys.

Metoden visade sig användbar när man bara har en liten provbit att tillgå.Försöken visade att repetitiva tester kan göras med bra resultat som går att jäm-föra med verkliga och FEM analys data.

Nyckelord

Keywords Small Punch, Ansys, Ultimate Tensile Strenght


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Abstract

In the turbine industry today, thermal barrier coatings are a commonly used, theseare 0.1-2mm thick. So to be able to do some type of mechanical testing to receivematerial data so one can build an opinion regarding the health of the material. Oneneeds a procedure that can work with small specimens and achieve clear resultsthat can be transformed and compared with known data and known procedures.One of those methods is Small Punch Testing.

This thesis describes one way to develop and test a functioning prototype of aSmall Punch Testing device. The thesis includes; the reason it was developed in

the beginning and how it has been developed throughout the decades, also in whichareas the main research is made. It also shortly describes a working procedure inAnsys to get a Finite Element Method [FEM] model working.

This method showed itself as useful, when just a small sample is at hand. Thetrials in this thesis also show that repetitive test can be done with good resultswhich can be compared with real and FEM analysis data such as σuts.

Inom turbin industrin idag så är keramiska värme barriärer vanligt förekom-mande dessa är normalt 0,1-2mm tjocka. För att kunna utföra mekanisk provningsom grund för att bilda en åsikt om materialets kondition. Så behöver man enmetod som kan åstadkomma tydliga data med små provbitar, Small Punch Testingär en av dem.

Den här rapporten beskriver hur man kan gå tillväga för att få en fungerandeprototyp. Den tar upp metodens ursprung och hur den har utvecklats under årtiondena, också mot vad den nuvarande forskningen riktar sig. Den beskriver ävenkort hur man ställer upp en finita element metod [FEM] modell i Ansys.

Metoden visade sig användbar när man bara har en liten provbit att tillgå.Försöken visade att repetitiva tester kan göras med bra resultat som går att jäm-

föra med verkliga och FEM analys data.

v


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Acknowledgements

This master thesis is made as a final project in the programme for a Master of Sci-ence degree in Mechanical Engineering, at the Division of Engineering Materials.I would like to thank my supervisor Håkan Brodin and all the people at the division

for their help and I would also like to thank the workshop staff.


vii


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Contents

1 Introduction 31.1 Aim and purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Method 52.1 Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1.1 Analytical method . . . . . . . . . . . . . . . . . . . . . . . 62.2 Specimen holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Results 9

4 Discussion 114.1 Clamp Force . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164.2 Performing the test . . . . . . . . . . . . . . . . . . . . . . . . . . . 164.3 Possible error sources . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.3.1 Ansys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5 Conclusion 19

A SPT drawings 21

B Ansys 25B.1 What to think about when modelling a 3-D modell in Ansys . . . . 25

B.1.1 Last minute results . . . . . . . . . . . . . . . . . . . . . . . 27

Bibliography 29


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x Contents


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Testing Device


June 14, 2010


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2 Contents

Nomenclature and Equations

d = disc diameter [mm ]

t = disc thickness [mm ]

E = E modulus [GPa ]

σ = tensile strength [MPa ]

= strain[% ]

σuts = ultimate tensile strength [MPa ]

dF = displacement at failure [mm ]

Lu = ultimate load [N ]

Cl = die clearance

D = ball diameter [mm ]

A = lower die diameter [mm ]

A = 1.5

D = 1

Equations 1, 2 and has been examined by S.D. Norris and J.D. Parker[1]

σuts = Lu

t (2.32D − 0.9Cl + 0.56) (1)

σuts = Lu

t ∗ (0.14D − 0.82Cl + 2.17dF + 0.6) (2)

Cl = A− (D + 2t)


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Chapter 1

Introduction

The ability of performing material investigations on small specimens is of greatimportance, especially when it comes to parts that are or has been in service. Smallpunch testing [SPT] has been developed for just that case e.g. to investigate apipe in a nuclear reactor that is still in service, this type of testing can be seen asa non destructive test due to the small specimen size.

1.1 Aim and purpose

The aim of this thesis work is to design and evaluate a SPT device for roomtemperature testing and to see to which theory it corresponds, i.e. uniaxial tensiletest [UTT] or other known methods. It was decided to use a device for roomtemperature testing to start with because it has not previously been done here atLinköping University, it can be seen as a pre-study to a high temperature device.The materials that will be examinined are Al 2524-t3, iron SS1312 and In792,these materials span from ductile to the not that ductile In792.

1.2 History

This type of technique has been around since the early eighties [2][3], foremost tostudy creep in high temperature alloys used in nuclear plants. The first two coun-tries where it started are the USA and Japan. There are two ways to look at SPTtime dependant, for example creep examination at different temperatures thanroom temperature and time independent, examination made at room temperatureto examine e.g. σuts

Nowadays it is mainly used in two different areas, high temperature alloys andultra high molecular weight polyethylene [UHMWPE] in biomaterials [4]. It has itgrounds in that one wants to be able to extract information from small volumes of

material. It can be used for shear force examinations, but in that case one uses aflat punch instead of the ball that is used to examine σuts. In steels one also usesSPT to find out ductile to brittle transition temperature [DBTT] [5]. They look at

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4 Introduction

the difference between Charpy test [CVN] and SPT the conclusion that they didfind was that the SPT results in a much lower transition temperature, the reasonswhy is closer discussed in the paper. The technique is applicable where there is anecessity to examine a product far too small to be able to produce normal sized

test specimen. The thermal barrier coating [TBC] of turbine shovels is a goodexample, due to the small thickness of the TBC, 0.1-0.25mm. A common typeof SPT uses transmission electron microscope [TEM] sample sized specimens i.e.3mm in diameter and between 0.1 and 0.5mm in thickness [6]. This is the SPTcommonly known as small punch test, which shall examined closer. One couldbelieve that the disc thickness is not of importance, but in [7] they have lookedcloser at the influence of disc size and one can see that the deflection stays thesame but the thicker the specimen the more force is needed, which one wouldhope to see. In [8] it is mentioned that a aspect ratio, disc diameter/thicknessshould be less than 60 otherwise the specimens showed signs of local deformation

and are not acceptable for use, with a aspect ratio over 118 local wrinkling andplastic instability occurs which is useless when a repeatable result is needed. Theyalso mention a thickness tolerance of +-0.0013mm but +-0.0051mm is a nominalacceptable value. Otherwise there is one standardized type with a disc diameterof 8mm and a thickness of 0.5mm used for metals [9][10] and for UHMWPE a discdiameter of 6.4mm and a thickness of 0.5mm[11]. The small sample size makes itcompatible with other non destructive tests. It also makes it possible to actuallytake a sample to examine from a product in use, which is a big advantage. As faras it comes to the design of the test equipment that was seen as the best to go for,has it grounds in two papers [12][13]. But the actual design is made from scratch

with the inner dimensions corresponding to the others.


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Chapter 2

Method

2.1 Method

At first a literature study was done, to see what has been done so far, and howit has been made i.e. history. Are there any standards applicable? Then followedthe actual CAD process to bring forth a working prototype, this took longer thanexpected because that it is my first prototype that I have made and I had very littleknowledge in the CAD programme Pro/Engineer 4 before I started. The wholeapparatus will be fitted in a 858 Mini Bionix R II system with a 10kN loading-cell

which will be more than sufficient to provide accurate test data. To have a moreexact measurement of the deflection an extensometer will be added under the die tomeasure directly the specimens deflection without any regards to ball compressionetc. In two of the materials that shall be examined, iron SS 1312 and Al 2524-t3,there will also be a UTT done to see how the two different methods correspond toeach other. The TEM sized samples will be produced through different methods,the Al 4010, Al 2524-t3 and SS 1312 will be punched from UTT specimens, In792discs will be produced through cutting a disc and there after follows grinding tothe correct thickness and from those plates the TEM sized specimen will be cutwith electronic discharge machining [EDM]. All the specimens are grinded with

500 SiC paper and In792 finished off with 1200 SiC paper. When the discs hadbeen produced the thickness of each was established with a digital dial indicator.The thickness was decided with three significant numbers. Due to the design of this device a thickness of maximum 0.25mm is a must. Larger thickness will leadto something equivalent to deep drawing of aluminium cans, highly undesirable.

Performing the test

The actual test was performed with a speed of 0.15mm/min which results in in-

formation about force and deflection during the test. The clamping force for Al2524-t3 ended up at 750-850N if more was applied the plate was plastically de-formed. For SS 1312 and In792 a higher clamp force was applied 1150-1350N.

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6 Method

2.1.1 Analytical method

The analytical methods used for comparison is the computer software Ansys Work-bench v.12 and equations 1 and 2 derived by S.D. Norris and J.D. Parker for moreinformaiton about the equations see [1].

Ansys

A model was created in Ansys Workbench Static Structural which is a modernFEM software with graphical interface, to have more numerical data to comparewith. When it came to achieve a working model in Ansys, there were a lot of problems getting it right due to all the constraints working in the model. Allthese questions had to be answered before implementing them: friction betweendifferent types of materials acting together? what type of load should be applied?2-D or 3-D? Which type of mesh gives most relying result in the model? The lastquestion could actually be answered after the model was working by trial and error.Some types of mesh gave some really disturbing results for example, deformationthat cannot occur. Due to the complexity of the model friction coefficients hadto be decided for each contact surface Cambridge Engineering Selector[14] wasused in combination with [15] to establish them. Two types of elements tetragonaland quad was tried, also different mesh concentrations, from 4500 up to 6500.The difference in deflection is 0.6% which for my application is negligible and inthe stresses measured according to von-Mises the difference was 2% which alsois negligible. So the simulations are run with the lower mesh with quad mesh,

to lower the time needed to do the calculations. The model used in this case isin 3-D to make it simpler to understand. The mesh used is in Ansys referred toas SOLD186, quad with 20 nodes. In Appendix B deeper information about theprocedures in Ansys can be found.

2.2 Specimen holder

The first thing done was a literature study to find information, if there was astandard, if not which dimensions where most commonly used for the TEM sized

specimens. Drawings were not found but applicable dimensions, but then therewas the shape, outer size and function to determine. At this stage consultaionswas made, with different persons working at the university and my supervisor anddiscussed different prototypes and concluded that according to this principle thatthe current prototype is built by is the most probable to succeed. Another obstacleencountered was how narrow should the different dimensions be, especially thespecimen clamper with its small diameter hole and the area under the sample witha radius of 0.2mm to prevent shearing to occur. The material for the device wasalso to be determined and after many different propositions Uddeholm Vanadis R 4Extra was chosen for the critical parts(A.1., A.3.) due to its good properties, high

wear resistance and high ductility which leads to high resistance against adhesivewearing and chipping. Through hardening, a hardness up to 66 HRC is achievable,which is in our application desirable. For the non critical parts steel will be used.


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2.2 Specimen holder 7

Besides that the force will be measured as well as the deflection. To be able todo this a holder for the SPT device had to be made. Here some problem due tothe physical limitations of the 858 Mini Bionix R II was encountered. To holdthe specimens under clamp force. It was designed so that disc springs can be

used to apply a different clamp force if it becomes necessary to change betweendifferent materials, which is most likely to be done between aluminium and In792.To be able to screw it together some type of grip had to be implemented, millingmachines have a similar shape as the prototype has. So specifications for howC-Spanners work was included into the design. As punch Cr-steel balls with ahardness of 60/66HRC will be used and as ball pusher a rod of 99.7% Al2O3 willbe used all this to minimize malfunction and interference during testing.

Figure 2.1. Device setup

Figure 2.1 shows the device setup in the machine, showing the black load celland with its puncher.


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8 Method


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Chapter 3

Results

With the designed small punch testing equipment repetitive tests have been madeand they show consistency which is a requirement to be able to draw conclusionsfrom the received data. When the data for the different materials was obtained, anaverage was calculated too and that value was compared withdata and the resultfrom Ansys.An example is shown in Figure 3.1 which represents a typical curve.

Figure 3.1. A typicall Load/Displacement curve

There is a concave part of the Load Displacement curve that can be derivedfrom the fact that the plate receives a larger contact area with the ball and at thesame time undergoes work hardening.

This shape of curve makes it more or less impossible to be able, by any means,to receive a yield stress so the focus has been set on σuts. To calculate σuts forAl2524-t3 and SS1312 Equation 1 has been used and Equation 2 for In792.

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10 Results

Table 3.1. Test data

Material Calulated σuts Ansys σuts Handbook σuts UTT σuts2524-t3 312 528 405-450 515

SS 1312 320 666 360-460 320

In 792 1320 1274 845

These are the data recived from tests with the other data available on theexamined materials. The handbook gives a span for σuts, the UTT for my specificmaterials are also represented.

Figure 3.2. Curves for the three examined materials

As seen above the SPT results in to similar curves for the tested materials.


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Chapter 4

Discussion

The calculated σuts for In792 is really close to the value from Ansys.

The Al 2524-t3 shows good correlation between the Ansys result and the UTT,but a significant difference to the calculatded value.For SS 1312 the calculated σuts and the UTT it is a perfect match but betweenAnsys and UTT the value received from Ansys is more than twice as high as forthe other values.As stated in [7] equation 1 and 2 are a good point of origin to find a more specificequation for the material that one is conducting research on at the moment, theneed to do that can easily be deduced from the analyzed data. If there hadbeen more consistency between the materials it would have been better. Of threedifferent pairing options all three were hit but this probably lies in the fact that

three very different types of materials was chosen, this to induce variating resultswhich was received. The method is not perfect but when properly used a reallygood option.

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12 Discussion

Figure 4.1. Whole curve with rupture

Figure 4.2. UTT 2524-t3

In Figure 4.1 the plastic deformation and the rupture is clearly seen but thewhere exactly does the transition from elastic deformation to plastic deformationoccur?. Figure 4.2 shows a UTT 2524-t3 test for comparison with a familiar datatype. With the three known steps, elastic deformation, plastic deformation andrupture of the material. Nevertheless, the curve in Figure 4.1 is really interesting,one should have in mind that this method affects the material in biaxial directions,

not uniaxial which is the most used procedure. As seen in 3.2, this type of curvewas seen in all the materials but the knee became less noticeable with increasingthickness. When the UTT values in Table 3.1 and the graphs in Figure 3.2 are


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13

compared, they correlate good between each other. SS1312 with the lowest valuealso has the lowest value in the graph which further supports the theory that thismethod gives repeatable and reliable results. The graphs curvature supports pre-vious work done in the field which also supports the statement of a working device.

In Figure 4.3 and Figure 4.4 fractures are shown for the different materials. Asexpected the crack propagation seem to have started at the top where the stressesaccording to Ansys are highest Figure 4.5.

Figure 4.3. Fracture In792


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14 Discussion

Figure 4.4. Fracture Al 2524-t3

Figure 4.5. Typicall stress distribution under force


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15

As seen in Figure 4.6 the stresses are spread out throughout the top of thespecimen which in reallity transforms into the microcracks seen in Figure 4.7.

Figure 4.6. Typicall stress distribution under force from beneath

Figure 4.7. Micro cracks in In792


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16 Discussion

Table 4.1. Serie 2524-t3

σuts 309 322 294 313 318 301 311Average 310

In Table 4.1 ultimate strenght is shown for AL 2524-t3, it is to be seen thatthe average value has a deviation of +4% and -5% which can be seen as goodconsistency regarding all unknown parameters that was declared at the beginning.

4.1 Clamp Force

The clamping force in this case was there to prevent slipping of the disc, so it

can be seen as clamped disc. It is also corresponds to how the test are commonlyperformed. The actuall affect of the clamping brings some questions. As statedpreviously large plastic deformation was observed when to high force was applied,was the estamination of how much the force must be reduced correct? or did itstill affect the material, but not at a macro level but at micro level and therefor not visible. They clamping force should there for be weak enough to leave noirreversible deformation but strong enough to prevent slipping. Equation 1 and2 do not take clamp force into regard, thus they are empiricall so they build onexperiments with know boundary conditions, so with similar conditions it shouldwork. The fact that the method is a plate with clamped edge can bring in the

question if [16] can be used, that is plate bending theory. The handbook shows twodifferent scenarios, plate with clamped edges and freely supported plate, and inSPT the scenario is a mixture of the two based on the fact that a radius of 0.2mmhas been implemented to prevent shearing that can occur. In the beginning it wasregarded as one solution but later on as more informatio came forth that idea wasdiscarde.

4.2 Performing the test

The velocity of 0.15mm/min was set at the beginning of the trails but highervelocities where also tried but they caused immediate failure of the ceramic staff,so the speed was kept at 0.15mm/min. One solution to prevent it from happeningcould have been to use a staff consisting of a harder ceramic.

4.3 Possible error sources

As possible error sources, some type of micro work hardening due to grinding. For

the Al 2524-t3 and SS 1312, surface roughness may play a part, only being grindedwith 500 SiC paper not 1200 as with In792. Was the friction between ball anddisc always the same. Was the clamping force exactly the same?


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4.3 Possible error sources 17

4.3.1 Ansys

In Ansys some obvious error sources are the defined parameters as friction coef-ficients, clamp force, the fact that it is not a transient analasis(it does not useconstant speed), mesh type and size. Most of these are taken into consideration

but there is always room for errors.


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18 Discussion


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Chapter 5

Conclusion

In this report small punch testing has been examined and discusses different typesof conclusion one can draw from the recieved data. And the results are encouragingto that point that they are repetitive and shows good consistency.The general equations used gives a rule of thumb about where the σuts will be.For further analasis a recommendation to perform trials at 0.10, 0.15, 0.20 and0.25mm thickness should be done with eight specimens of each thickness andremove the specimens with the highest and lowest value. This to minimize theaffect of anomalies thar can occur during testing.

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20 Conclusion


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Appendix A

SPT drawings

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22 SPT drawings

Konstruerad av

Artikel nr/Referens

Ägare

Utgåva Blad

Titel/Benämning

SkalaVyplacering jämnhet, RaGenerell yt-

Ritningsnummer

Pos nr Antal

Granskad av Generell toleransGodkänd av - datumSS-ISO2768-1

Titel/Benämning, beteckning, material, dimension o.d.

IEILinköpings universitet

Godkänd av-datum Ändr nr Ändringens art/Ändringsmeddelande

M52x1.5

21.5-0.1

3 7 ± 0 .

5

3 0 ± 0 .

5

1.5+0.1

3 .

2 - 0 .

0 5

2 1 + 0 .

5

1 - 0 .

1

4 ± 0 .

5

6.3

6.85±0.5

A-ASECTION

R4

B-BSECTION

0.2x45°R0.2

1x45°


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23

Konstruerad av

Artikel nr/Referens

Ägare

Utgåva Blad

Titel/Benämning


Ritningsnummer

Pos nr Antal





70.00±1

M52.00x1.5

3 5 .

0 0 ± 1

2 1 .

0 0 ± 0 .

5

8 . 0

0 ± 0 .

5

2 0 .

0 0 - 0 .

5

1.00±0.5

4 .

0 0 ± 0 .

5

10.85

6.30

1 5 .

0 0 ± 0 .

5

B-BSECTION

1x45°

1x45°

1x45°

1x45°

A-ASECTIONR4

Figure A.1. A.2 Die top


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24 SPT drawings

Konstruerad av

Artikel nr/Referens

Ägare

Utgåva Blad

Titel/Benämning


Ritningsnummer

Pos nr Antal





21+0.1

8±0.2

3.1+0.05

1.05±0.01

1 + 0 .

1

1 5 ± 0 .

5

1 9 ± 0 .

5

A-ASECTION

C-CSECTION1x45°

Figure A.2. A.3 Specimen clamper


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Appendix B

Ansys

B.1 What to think about when modelling a 3-D

modell in Ansys

In this thesis Ansys Workbench v. 12 Static Structural was used. The problemsdo not only lie in the choosing of mesh, in my case that was the easy part. Thereal problem was to find what specific commands that has to be turned on whenworking with a 3-D non-linear model with large deformation. How to define theproper connections and constraints. Here follows a short list with the most critical

settings in my modell.

In Commands file;

CNCHECK, AUTO

In the outline tree

Behaviour: Asymmetric

Formulation: Augmented Lagrange

Normal Stiffness: Manual

Normal Stiffness Factor: between 0.01-0.04

Large Deflection: ON

Weak Springs: Program Controlled

In Solutions be careful for what you want, think twice when defining in Scopewhich bodies/surfaces one want to receive data from, most probably not the wholesystem.

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26 Ansys

For the analasis made, some material parameters had to be stated in Ansysand a non-linear model was uses and then Ansys need the following data.

Density

Young’s Modulus

Poisson’s Ration

Yield Strenght

Tangent Modulus

Figure B.1. Defined modell in Ansys

Figure B.1 shows how the applied forces and limitations was applied. The onlything changing between the test was the material of the disc in this model. Thiswas done to have so few variables as possible.The clamping force was set to 2000 N, but using the limitation of displacement, so

the compacting of the disc was limited to maximum 0.015mm. The punch force of 500 N was set on the fact that most of the other tests done in this field has useda 500 N load cell to perform this type test.


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B.1 What to think about when modelling a 3-D modell in Ansys 27

B.1.1 Last minute results

A last minute change was done, this change was to increase the step length so itcorresponds to resluts received in the SPT tests for each material, that is the timeit took for the specimen to reach maximum force.

For the different materials better data was the result, higher accuracy comparedwith handbook data was achieved for SS1312 and AL 2524-t3 the new data canbe seen in the table below.

Table B.1. Ansys last minute data

Material Ansys σuts Handbook σuts2524-t3 339 405-450

SS 1312 362 360-460In 792 1274 845

But In792 received the same value, so is that because of that it is a more brittlematerial or has it some other ground? That is for future tests to decide.


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28 Ansys


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Bibliography

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[2] Jai-Man Baik, J. Kameda, and O. Buck. Small punch test evaluation of inter-granular embrittlement of an alloy steel. Scripta Metallurgica , 17(12):1443–1447, 12 1983.

[3] G. E. Lucas. The development of small specimen mechanical test techniques.Journal of Nuclear Materials , 117:327–339, 7 1983.

[4] S. M. Kurtz, C. W. Jewett, J. S. Bergström, J. R. Foulds, and A. A. Edidin.Miniature specimen shear punch test for uhmwpe used in total joint replace-ments. Biomaterials , 23(9):1907–1919, 5 2002.

[5] M. A. Contreras, C. Rodríguez, F. J. Belzunce, and C. Betegón. Use of thesmall punch test to determine the ductile-to-brittle transition temperature of structural steels. Fatigue and Fracture of Engineering Materials and Struc-tures , 31(9):727–737, 2008. Cited By (since 1996): 1.

[6] T. Misawa, T. Adachi, M. Saito, and Y. Hamaguchi. Small punch tests forevaluating ductile-brittle transition behavior of irradiated ferritic steels. Jour-nal of Nuclear Materials , 150(2):194–202, 10 1987.

[7] Zhao-Xi Wang, Hui-Ji Shi, Jian Lu, Pan Shi, and Xian-Feng Ma. Small punch

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