LS Dyna Tutorial

7/24/2019 LS Dyna Tutorial

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Example Impact

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DefnitionA Shell Elements drop and rebounds rom a elastic plate.Plate measure 40*40*1 mm !1" elements#

Dropped shell has 10mm side len$th and % mm thic&ness.

Drop hei$ht is 10mm

Element ormulation is 'elutsch&o()sa

Defne a surace to surace contact +ith % +a detection.

Defne the elastic plate as ,aster and impactin$ shell as sla-e.Initial elocit is 100/000 mmsec -erticall

End )ime is 0.000% sec.

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Set(p2or model setup +e use -arious option in the preprocessor tab.3reate % areas +ith reuired dimension as sho+n belo+ !Preprocessor(,odelin$(create(#.

)ransorm drop shell to reuired drop hei$ht.


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,eshin$

Part Material Element Type Realconstant

1 1 1 1

% 1 1 %

Defne Element )pe 1" !Preprocessor(Element tpe(addeditdelete(#Part should be defned usin$ ri$ht combination o material / real contact / element

tpe. 'eore meshin$ this has set and can be confrmed at status bar.

Status

'ar4


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,eshin$ cont5Defne 6eal 3onstant to assi$n section properties

or thic&nesses. 2or each thic&ness there should beone real constant. !Preprocessor(6eal 3onstants#

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,eshin$ 3ont5,aterial PropertiesDefne material properties or -arious parts usin$ option

sho+n belo+. !Preprocessor(,aterial Props(,aterial,odels#

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3reatin$ PartsAssi$n the correct material/ section properties and element tpe to

create parts.

2or 8S(Dna to reco$ni9e a part/ its should be a $roup o elementsthat ha-e the same combination o element tpe/ real constant set/and material reerence numbers

6epeat this to all areacomponents !Preprocessor(,eshin$ : ,esh

Attributes#

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6e-isitin$ ,eshin$Set line seedin$ or element si9e. !Preprocessor(,eshin$(,esh tool(Set#,esh olume /Areas and lines to $enerate solid/ shell or beam

elements.

6eer ima$es belo+ to access the meshin$ tool.

e and plate>n or elementand node components. 6eer ima$es belo+ to access the menuoptions.

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Addin$ 3onstrains to ,odel)he plate is fxed at its boundaries !Preprocessor(8S(D@A(3onstraints(Bn odes#3reate a node component or select the desired nodes to appl the constrains.

6eer ima$es belo+ to access the menu options to add constrain.

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Defnin$ contactsIn this model +e +ill create a Automatic Surace to Surace 3ontact.

3hoose the mo-in$ plate as contact surace and fxed plate astar$et surace. !Preprocessor(8S(D@A(3ontact(Defne3ontact#

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Initial elocit)he mo-in$ plate has initial -elocit o 100/000 mms in -ertical direction.Initial -elocit can be applied usin$ option under 8S(Dna Bption tab as

sho+ belo+. !Preprocessor(8S(D@A(Initial elocit(+odal 6otate#

1%


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Solution Settin$As per problem defnition end time is 0.000% sec/ remember

that most o impact problem occur o-er a time o ms.

=e no+ use option in the solution tab !Solution : )ime3ontrols : Solution )ime#

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Butput 3ontrols

In output controls +e6euest or both Anss and 8S(Dna 6esult ormatsSet the reuenc at +hich result fles are +ritten6euest or Special Ascii fles +hich has inormation on sstem ener$ies/ odal and Elemental results.Select the components or +hich )ime(Cistor results has to be +ritten.

@ou could reuest or 10Ascii fles at a time the mostreuent used arelobal statistics data'oundar condition orcesand ener$,aterial ener$ies summareometr contact entitiesode data

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Solution and 6esults3lic& on the Sol-e option in run the simulation !Solution : Sol-e#

As Discussed beore this example Post processin$ option areeneral Post Proc

)ime Cistor Post Pro

Attached is the animation o the sol-ed problem.

tilit ,enu Plot3trls Animate B-er 6esults

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test.a-i


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)ime( Cistor Post Processin$)imeCist Postpro ariable ie+er 2ile

Bpen Explicit Dnamics 6esults!*.his# Fobname.his

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