fatigue analysis
hi,
Is it necessary to carryout the linear static analysis first before doing the fatigue analysis.
If the stress exceeds the UTS , still can we caryyout the fatigue analysis.
sagar.
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dynamic crack initiation
Hello everyone, I am studying the dynamic crack initiation problem of composite material. Just like the below imagine ,a crack perpendicular to the interface of two different materials, under dynamic load, the crack will propagate, at the crack tip I use the singular element to simulate the stress and strain state. after I have the crack tip stress, how can I calculate the energy release rate of different direction, for example, also along the original crack line or perpendicular to the original crack line., or kink from the 45 degree of original crack line.
Probelm with Abaqus/Explicit
Hi,
I am using cohesive elements to model the interface around a
circular inclusion. First I used Abaqus/standard I got proper results
but when I used same values with an amplitude curve (tabular, linearly
applied) to apply load quasi-statically in Abaqus/Explicit, I could not get a converged
solution. Field variables are oscillating and elements getting
distorted excessively. In Abaqus/Explicit I am applying load very
slowly but even though same problem persists.
Regards
Gouse
LS DYNA User Defined Failure Criterion
Hi:
I am simulating a projectile impact on a plate and using LS - DYNA for the same.
I have to use Barlat's anistropic plasticity model with the Johnson Cook Failure Criterion.
Now, Although Barlat's Model is in built into LS DYNA, how do I implement JC Failure criterion ? Is there a feature of User defined failure criterion in DYNA ?
If not, Is implementing a UMAT consisting of Barlat's consitutive eqn and JC failure criterion the only other option ?
Thank You,
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Symmetry of Infinitesimal (linear) strain tensor
Hello everyone,
Why do we have the infinitesimal (linear) strain tensor to be symmetric? The reasons, which I have understood so far are:
1. It is defined to be symmetric so that it behaves like a tensor.
2. The stress tensor, which is its energy conjugate, is symmetric, and hence the skew-symmetric part has no contribution towards strain energy.
Can anyone suggest more fundamental reason(s) for the symmetry of linear strain tensor, like the moment equlibrium leading to symmetry of the Cauchy stress tensor?
Thanks in advance,
Issue of "COMMENTS FIELD IS REQUIRED"
Hi everyone,
Sometimes while replying for the answered queries, I face the issue of "COMMENTS FIELD IS REQUIRED" inspite comments field is filled. I have attached the same in the presentation. Please go through it help in this regard.
Thanks and Regards
M Gopalakrishnan