Material Cards for Structural Analysis

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  1. 1. APRIL 28, 2015 CYTEC.COM Cytec Industries Material Cards For Structural Analysis Fabio Bressan
  2. 2. 2 Cytec Industries Goals MC meaning MC importance MC methodology
  3. 3. 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. 4. 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/mm] 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. 5. 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. 6. 6 Cytec Industries Productivity imperfections Elasto-plastic behavior Deterministic vs Probabilistic What I Learned From My Experience
  7. 7. 7 Cytec Industries Ferrari vs Cytec Material Card High correlation between virtual non- linear CYTEC Material Card and experimental compressions curve CYTEC non-linear Material card has slight low elastic modulus in tensionWrong Material Card Experimental Curve TENSILE ASTM 3039 COMPRESSION ASTM D695
  8. 8. 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. 9. 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
  10. 10. APRIL 28, 2015 CYTEC.COM Cytec Industries Thank You