I face with this error in my job. The ratio of deformation speed to wave speed exceeds 1.0000 in at least one element. This usually indicates an error with the model definition. Additional diagnostic information may be found in the message file. Is it probably about the material property definition?
Thanks
This means that you are deforming the element faster than a stress wave can propogate across it.
Possible solutions:
1. Try to reduce the mass scaling factor ( if you are using automatic mass scaling, you may be scaling too much and asking ABAQUS to increase the density of the material too far)
2. Make loading rate smoother and modify BC
3. It may caused by inconsistent units. Be sure that your material density is correct in terms of its unit.
4.In ABAQUS/Explicit there is an option called "distortion control". This option puts a hard stop on the element, preventing them from exceeding the deformation ratio. This may solve your symptom, but I think it would be better to find out the underlaying cause and solve that instead.
Hope this helps.
this may also be the problem , when you have not provided the required boundary condition
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