A: SMAC dynamically models the loading and unloading of the vehicle structure so the CRASH 'A coefficient' is not needed. Secondly the AKV (crush stiffness input for SMAC) is similar to the CRASH 'B coefficient' however it is generally less since the CRASH 'B coefficient' includes the reduction in crush due to restitution for the given speed(s). The SMAC input AKV is the loading stiffness of the vehicle structure.
- We currently have a working version of msmac which makes use of CRASH A & B coefficients for automatic calculation of restitution coefficients (we haven’t announced/activated it yet (we have a lot of research going on on various aspects of all our simulation modeling and reconstruction techniques).
- You may note that you no longer need Coefficient of Restitution inputs on Card 14. You can delete it since we have defaults built in for the coefficients if no CRASH A & B coefficients are input)
- The CRASH A & B Coefficients are based on measurements made to damaged vehicle (s) after crash tests at a known impact speed. CRASH equates the impact speed and the residual crush with no consideration for the resitution.
- The SMAC AKV crush stiffness input is the structural crush stiffness that is observed and measured in crash tests.
For additional information please see our Review of CRASH Damage Analysis