Element creation

Umehr Beebeejaun

Hello, i'm simulating a scenario where i'm crashing a seat with its frame against a floor and i wanted to add an energy absorption component between the frame and the seat, in order to reduce the impact on the seat/dummy. I tried using a spring but the spring springs back somehow in the simulation, which i don't want. 

 

The idea behind is that the energy absorbing component takes all the energy and deforms itself, which will reduce the acceleration on the seat in the crash  

 

Any idea what type of Elements/Components i can use here? and the related properties to it? 

Thanks, 
Umehr