Unity 2D - How to calculate weight/strain?

Hi!

Is there a way to calculate the weigth of all physic objects, which are on top of another one. I want to make a physics object destructable, and the relativeVelocity is not enough to determine if it should be destroyed.

Think about a contruction simulation, where somthing breaks, if there is too much strain.

Does anyone has an idea to get this working?

Thanks!