I am modeling a low-velocity impact with drop-weight in a composite plate using Abaqus Explicit. I am using S4R elements for the laminas and cohesive surfaces with SFM elements.
In this case (image below) I set an initial velocity to the bullet to have an impact energy of 12J, which is the initial value of the kinetic energy. Then during the impact, this kinetic energy should transform to internal energy, reaching it up to this 12J also, if I understand it correctly, and then fall again until it remains stable.
Does somebody know what could be the reason why the internal energy does not reach the 12J that I have established as the impact energy of the model?
Thank you!
Dear Alex,
During LVI impact, total energy should not be changed. In this example, total energy increasing is because of creating artificial strain energy ALLAE during analysis. It's better to decrease stable time increments by scale factor of 0.9 in step definition to reduce artificial strain energy creation.
Also total energy is sum of all energy terms in problem that include fictional dissipated energy. Therefore add ALLFD to ALLIE and check its' equality with ETOTAL.
Regards,
M. Khodaei
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