Krishna Kumar

4 Questions 3 Answers 0 Followers

Questions related from Krishna Kumar

How can I find the equivalent plastic strain increment for the Johnson-Cook damage model?

I have developed a VUMAT material model for Johnson-Cook plasticity. Now, I have to add Johnson-Cook damage/failure model to my code. Johnson-Cook Damage model : D = ∑ εp(eff)/εf Fracture...

07 July 2018 659 4 View

How do I add Damage evolution to my VUMAT user subroutine?

I am writing a VUMAT for Johnson-Cook plasticity model and J-C fracture/failure model and comparing its results from in-built J-C model in ABAQUS/Explicit. While modeling on ABAQUS, input file...

07 July 2018 3,011 3 View

How to find the Triaxiality ratio for flat plate specimen?

According to Bridgman’s analysis, the initial stress triaxility( σ )* for axisymmetric rounded specimens can be obtained with the subsequent expression: ( σ )* = 1/3 + ln(1 + r/2R) But In case...

06 June 2018 2,346 2 View

What are some good software packages for curve fitting of non-linear equations?

I have to fit my curve based on Marquardt method and universal global optimization method. My equation is y = (a + b*exp(-c/3)*(1+d*ln(x)) Is there any software package to fit this curve?

06 June 2018 674 4 View