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Output data base can't reflect input file when using abaqus UMAT

Submitted by icin on
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Hi~~ 

i tried to model simple thing with abaqus UMAT.

and i changed the input file like
----------------------------------------------------------------------------------- 

from 

*USER MATERIAL,CONSTANTS=2

17240, 0.3

to 

*USER MATERIAL,CONSTANTS=2

1724, 0.3 

how to convert umat to vumat

Submitted by 1366060 on
research

hi every body

i want to model microforming processes using crystal plasicity,,, i have Dr huang single crystal code writing in umat inteface,,, i want to model some forming processes i abqus/explicit so i should write or convert above code to VUMAT code ,

 can anybody guide me how to do it? 

any help would be appreciated 

relation between the Euler-Lagrange strain tensor and the 2nd Piola-Kirchhoff stress tensor

Submitted by xalbert76 on
research

At finite deformations, the 2nd Piola-Kirchhoff stress tensor S_{IJ} is work-conjugate to the Euler-Lagrange strain tensor E_{IJ}, i.e. the work done by the stress S_{IJ} at developing a strain E_{IJ} per unit volume in the reference configuration is

W = 1/2 S_{IJ} E_{IJ}  (Einstein summation over repeated indices implied)

I would like to express this in the same form as used in linear elasticity, i.e. to write S_{IJ} = M_{IJKL} E_{KL}, which would give me

W = 1/2 M_{IJKL} E_{IJ} E_{KL}

How can a zero length torsional spring element be modeled in ANSYS?

Submitted by Abulhware on
research
carbon nanotubes

Aoa

Hello

brothers

Currently,

I‘m working on the determination of the mechanical properties of carbon nanotubes

for different loading cases using ANSYS software ( i need to use them in my

model). My Finite Element model of graphene and carbon nanotube is working fine with beam188 element, but I have

some technical problems in my simulation. These problem are summarized in

points as follow;

Negative to positive strain rate sensitivity in 5xxx series aluminum alloys

Submitted by Amit Pandey on
research
Plasticity
strain rate
Aluminum alloy

In continuation to our previous work on 5xxx series Al alloys

Experimental and numerical investigations of yield surface, texture, and deformation mechanisms in AA5754 over low to high temperatures and strain rates

node/14353

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