188
Appendix A – Constituent level
It should be noted that these equations are only valid up until necking of the material.
From the converted true stress-strain relationship the yield stress as function of the plastic strain can be extracted as pairs of values. This is illustrated graphically in in the following figure using the example of Ureol under compression. The eventually implemented material models are given in appendix A3.
Yield stress
Plastic strain
20.1871
0.0
26.9850
0.0049
30.2125
0.0175
31.5531
0.0398
41.0303
0.3378
Appendix A – Constituent level
It should be noted that these equations are only valid up until necking of the material.
From the converted true stress-strain relationship the yield stress as function of the plastic strain can be extracted as pairs of values. This is illustrated graphically in in the following figure using the example of Ureol under compression. The eventually implemented material models are given in appendix A3.
Yield stress
Plastic strain
20.1871
0.0
26.9850
0.0049
30.2125
0.0175
31.5531
0.0398
41.0303
0.3378