We need to get the minimum stable time increment of elements in the whole model using ABAQUS software to carry out tensile strength simulation of the CFRP.
Dear Ahmed
Determine the critical time step as follow:
Critical time step=L/C
where L is the minimum distance between element nodes (choose the smallest element) and C is the sound velocity in the material.
Finally, chosen time step for the analysis must be smaller than calculated critical time step.
It should be noted that the sound velocity is different in various materials. For example, the sound velocity in the steel material is about 5240 m/sec and is 1478 m/sec in the water.
You can use the Verify mesh command in the mesh module to check estimated stable time increments throughout your model. Also when you run it, you get a summary of the lowest ones in your .sta file.
Best regards,
David
You can determine the stable time increment Δt as follow:
Δt=Le/Cd
where Le is the minimum distance between element nodes (you should choose the smallest element from the mesh in the whole model) and Cd is the sound velocity in the material.
The sound velocity for a linear elastic material with Poisson's ratio equal to zero is given by:
Cd= sqrt(E/ρ).
Finally, the chosen time step for the analysis must be smaller than the calculated stable time increment.
It should be noted that the sound velocity is different in various materials. For example, the sound velocity in the steel material is about 5240 m/sec, is 6320 m/s in aluminum and approximately 3400 m/s in concrete.
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