bilinear material in abaqus 1

[gkunal]

I have doubt regarding how to model bilinear material in abaqus. once I define elastic properties how to define plastic properties? tangent modulus, yield strength and plastic strain?

 

[Dave442]

Hi gkunal,

You can define a linear elastic material as follows:

*MATERIAL, NAME=STEEL
*ELASTIC
200.E9, 0.3

Here, the Young's modulus and Poisson's ratio are set at 200 GPa and 0.3 (-). You can define a perfect elastic-plastic material as follows:

*MATERIAL, NAME=STEEL
*ELASTIC
200.E9, 0.3
*PLASTIC
380.E6,0.0

Here, the Yield stress at zero plastic strain is set at 380 MPa and no hardening is included. You can define a bilinear elastic-plastic material as follows:

*MATERIAL, NAME=STEEL
*ELASTIC
200.E9, 0.3
*PLASTIC
380.E6,0.0
580.E6, 0.35

Here, the Yield stress rises from 380 MPa to 580 MPa at a plastic strain of 0.35. This is all covered really well in the "Getting Started with Abaqus" manuals (nboth the interactive and keyword versions). They go through several examples too. You should give them a read.

Good luck,
Dave