Learning Forum

[tinerdc]

In crash simulations which we have studied, the inputs to the simulation are vehicle configuration, material properties, velocity, hit points, and time interval to complete collision.

• Now, is it reasonable to assume the time interval? Why cannot we obtain it as a result? (Obviously, this time interval is a dependent variable!)

• Anyway, if the solving procedures are developed as stated above, we propose the following method:

Carry out the simulation for pre-assumed few time intervals, then obtain the strain energy stored after the collision for each time interval. Then select the suitable time interval for which the stored strain energy is closest to the kinetic energy of the body prior to collision.

[Armin]

Hello,

I believe by "time interval" you're referring to the time step size in an explicit analysis for your crash simulation. If so, the video below provides good guidelines on the time step size and how to be cautious when using numerical techniques (such as mass scaling) to increase the time step size:

Time Step in Explicit Dynamics - Lesson 2 (youtube.com)

[tinerdc]

Hello Armin,

Thank you so much for your support.