BaYao cheng

I'm a doctoral student from Huazhong University of Science and Technology in China. The paper 'Levenberg–Marquardt vs Powell’s dogleg method for Gurson–Tvergaard–Needleman plasticity model' was wonderful. I had tried my best to test the gtn code based on the website netlib.org/slatec/src/dnls1.f, but I found it always could not converge. when I used the 'powell-lm.f90' code and 'gtn-st-1fet-usr.inp' in abumpack4. the job aborted due to unrecovered error, the log showed 'too many function evaluations'....

I'm a doctoral student from Huazhong University of Science and Technology in China. The paper 'Levenberg–Marquardt vs Powell’s dogleg method for Gurson–Tvergaard–Needleman plasticity model' was wonderful. I had tried my best to test the gtn code based on the website netlib.org/slatec/src/dnls1.f, but I found it always could not converge. when I used the 'powell-lm.f90' code and 'gtn-st-1fet-usr.inp' in abumpack4. the job aborted due to unrecovered error, the log showed 'too many function evaluations'....

I'm a doctoral student from Huazhong University of Science and Technology in China. The paper 'Levenberg–Marquardt vs Powell’s dogleg method for Gurson–Tvergaard–Needleman plasticity model' was wonderful. I had tried my best to test the gtn code based on the website netlib.org/slatec/src/dnls1.f, but I found it always could not converge. when I used the 'powell-lm.f90' code and 'gtn-st-1fet-usr.inp' in abumpack4. the job aborted due to unrecovered error, the log showed 'too many function evaluations'....