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billowriver's blog

How to calculate a shockwave profile

Submitted by billowriver on

For a steady shock wave, since we know Rankine–Hugoniot relations,and Equation of state,

from downstream values, we can directly calculate upstream values, we know all the quantities, density, particle velocity, specific energy are functions of z (where z=x-ct), but, how to relate these quantities to z, and how to plot a S-Shape curve like density vs. z.  

A question about deformation gradient in ABAQUS user subroutine VUMAT

Submitted by billowriver on

I have a question about deformation gradient in VUMAT.

When I use one element, Vumat works well and there is no any problem. Initially, only the diagonal part of deformation gradient is one, the others are zero. However, the problem is when several elements are considered, all the components of deformaiton gradient are equal to one at very beginning.