APRIL 28, 2015
CYTEC.COM
© Cytec Industries
Material Cards For Structural Analysis
Fabio Bressan
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Goals
MC meaning
MC importance
MC methodology
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The MC for FRP LAMINA are a set of parameters that describe the stiffness and strength performance in direction 1, 2 and 3.
Material Card Meaning
Stiffness Strength
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MTM49-3 T700S
Modulus of elasticity in longitudinal direction E1 [MPa] XXXXXX
Modulus of elasticity in transversal direction E2 [MPa] XXXXXX
Poisson's ratio NU12 - XXXXXX
Inplane shear modulus G12 [MPa] XXXXXX
Transverse shear modulus for shear in 1-Z plane G13 (G1,Z) [MPa] XXXXXX
Transverse shear modulus for shear in 2-Z plane G23 (G2,Z) [MPa] XXXXXX
Mass density RHO [ton/mm³] XXXXXX
Tension stress limit Xt (11) [MPa] XXXXXX
Compression stress limit Xc (11) [MPa] XXXXXX
Tension stress limit (transverse direction) Yt (22) [MPa] XXXXXX
Compression stress limit (transverse direction) Yc (22) [MPa] XXXXXX
Shear stress limit S [MPa] XXXXXX
Interlaminar Shear stress ILSS (SB) [MPa] XXXXXX
Thickness (single ply) th [mm] XXXXXX
Example Of Linear Material Card
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LINEAR ANALYSIS
FPF
Linear Analysis First Ply Failure
IMPLICIT NON LINEAR
ANALYSIS PPFA
Progress Ply Failure Analysis
EXPLICIT NON LINEAR
ANALYSIS Crash with:
Rupture Delamination and
Failure Modes
Failure Criteria
80% of Classic Designs
20% of Classic Designs
100% of Crash Designs
Homogeneous Anisotropic (Composite)
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Productivity
imperfections
Elasto-plastic behavior
Deterministic vs
Probabilistic
What I Learned From My Experience
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Ferrari vs Cytec Material Card
High correlation between virtual non-linear CYTEC Material Card and
experimental compression’s curve
CYTEC non-linear Material card has slight low elastic
modulus in tension Wrong Material Card
Experimental Curve
TENSILE ASTM 3039
COMPRESSION ASTM D695
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Cytec Methodology
Stress/strain curves editing by standard mechanical test (ASTM) and in parallel Virtual modelling of mesoscale FE
Create Linear and non-linear virtual material cards for FEM for different kind of code (RADIOSS, NASTRAN, etc.)
Prove Material Cards with Correlation of Experimental-Numerical test for Bending and Torsional with a flexible Jig
1
2
3
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MC are not a simple collection of ASTM data
Accurate MC can save a lot of money and time
MC are non linear for complex failure (crash)
Conclusions
Methodology to create MC and a Methodology to prove the accuracy
MC are stochastic and not deterministic
MC can help to design and compare new CYTEC
materials virtually
APRIL 28, 2015
CYTEC.COM
© Cytec Industries
Thank You