NX Nastran composite tensile/compression properties
NX Nastran composite tensile/compression properties
(OP)
I am using Nastran NX 8.0. I'm using the MAT8 card to input 2D properties for a unidirectional CF. The material properties I have specify different tensile and compression modulus and Poisson's ratio. My load case is complex so bending is impossible to predict.
Is there a way to input different tensile and compression properties? If not, what is the preferred method of selecting which material property values to use?
Is there a way to input different tensile and compression properties? If not, what is the preferred method of selecting which material property values to use?





RE: NX Nastran composite tensile/compression properties
In order to enter MAT8 NX NASTRAN (the solver) card data in NX 8.0 AdvSim (the pre/post) you need to select ORTHOTROPIC material properties, if not by default you are defining an isotropic material. Then in the interface you will see request for:
• Young’s Modulus (E1)
• Young’s Modulus (E2)
• Young’s Modulus (E3)
Also, in the Strength tab, Orthotropic properties, you can enter Allowable stress and strain for laminate failure analysis, with Stress/Strain Limits at:
• Tension (ST1, ST2, ST3).
• Compression (SC1, SC2, SC3)
• Shear (S12, S13, S23)
Also you can define the Tsai-Wu Interaction Coefficient (F12).
Best regards,
Blas.
~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director
IBERISA
48011 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog de FEMAP & NX Nastran: http://iberisa.wordpress.com/
RE: NX Nastran composite tensile/compression properties
RE: NX Nastran composite tensile/compression properties
So I think you probably need to use nonlinear solution sequences for this problem.
RE: NX Nastran composite tensile/compression properties
RE: NX Nastran composite tensile/compression properties
RE: NX Nastran composite tensile/compression properties
To the best of my knowledge, no, you cannot specify both a tensile and a compressive modulus. Doing so would essentially create two different ABD matrices (laminate theory) and thus two different solutions.
For what it's worth, my general approach is to average the tensile and compressive moduli in each direction...
RE: NX Nastran composite tensile/compression properties