APRIL 28, 2015

CYTEC.COM

© Cytec Industries

Material Cards For Structural Analysis

Fabio Bressan

2 © Cytec Industries

Goals

MC meaning

MC importance

MC methodology

3 © Cytec Industries

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

4 © Cytec Industries

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

5 © Cytec Industries

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)

6 © Cytec Industries

Productivity

imperfections

Elasto-plastic behavior

Deterministic vs

Probabilistic

What I Learned From My Experience

7 © Cytec Industries

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

8 © Cytec Industries

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

9 © Cytec Industries

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