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high velocity impact

When to use equation of state models in modeling high velocity impacts?

Equation of state models (Mie-Gruneisen equation of state etc) have been widely used to study hydrodynamic response of material during explosive deformation, ballistic impacts for a long time. As far as I understand, a hydrodynamic response is required to be incorporated in a model if the pressure of impact leads to an increase volumetric strength. That is the stress wave speed in the material exceeds the speed of sound in the material (v = sqrt(elastic modulus/density)).  Ballistic impacts occur at strain rates close to 10^9 to 10^12/s.

Ramathasan Thevamaran's picture

Dynamic creation and evolution of gradient-nano-grained structures in single-crystal metallic microcubes

In an article published today in Science, we have demonstrated the creation of an extreme gradient-nano-grained (GNG) structure in single-crystal microcubes through high-velocity impact. We use the defect-free single-crystal silver microcubes, synthesized using a seed-growth process, as the model system, and fire them at supersonic velocities onto a rigid target to create the GNG structure.

error in lsprepost file

Hi there,

 

I'm using LS-DYNA as a tool in my study. Currently, i'm facing this problem:

 

Run-time check failure#3 - the variable 'count_ntime' is being used without being initialized

 

Please...help me...I've done so many new models, yet the same error keep occurring...

 

Thanks... 

 

p/s: i can be reached by this e-mail: man@ppinang.uitm.edu.my 

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