wnmascare
Petroleum
- May 18, 2012
- 37
Hi everyone.
I got the real stress-strain curve illustrated in the attached figure for AISI 1045 steel and I need to get the data set for an elastoplastic analysis in Abaqus, i.e., I need to get the data pairs true stress-true plastic strain.
You can observe that the curve deviates from ideal behavior, i.e., it has a plateau region at a stress level of about 500 MPa. In this case, according to standard ASTM E8E8M, two yield strengths will be obtained: upper and lower yield strengths. The red line is the line for the offset strain of 0.2%.
When we have an ideal stress-strain curve, we obtain the yield point by getting the intersection point between the 0.2% offset line and the stress-strain curve. This point will be the first one of the elastoplastic data set and the other ones can be easily calculated. Thus, my question is: how can I get the elastoplastic data set (true stress x true plastic strain) when I have a stress-strain curve which deviates from the ideal curve? Should I disregard the plateau region and translate the nonlinear portion to the point where it intersect with the linear region and then calculate the other points?
What do you guys think? Have you ever faced such situation before?
Thanks in advance. Any help will be appreciated.
I got the real stress-strain curve illustrated in the attached figure for AISI 1045 steel and I need to get the data set for an elastoplastic analysis in Abaqus, i.e., I need to get the data pairs true stress-true plastic strain.
You can observe that the curve deviates from ideal behavior, i.e., it has a plateau region at a stress level of about 500 MPa. In this case, according to standard ASTM E8E8M, two yield strengths will be obtained: upper and lower yield strengths. The red line is the line for the offset strain of 0.2%.
When we have an ideal stress-strain curve, we obtain the yield point by getting the intersection point between the 0.2% offset line and the stress-strain curve. This point will be the first one of the elastoplastic data set and the other ones can be easily calculated. Thus, my question is: how can I get the elastoplastic data set (true stress x true plastic strain) when I have a stress-strain curve which deviates from the ideal curve? Should I disregard the plateau region and translate the nonlinear portion to the point where it intersect with the linear region and then calculate the other points?
What do you guys think? Have you ever faced such situation before?
Thanks in advance. Any help will be appreciated.