Sarvesh Rathi
Subscriber

Im not entirely sure what you mean by this: 

I push to material into compression, it will stretch.  In other words, negative stress, gives a positive strain.

But in my understanding when air is induced in the internal compartment it should inflate. And yes, the material is silicone rubber.

Refer to this link for the simulation output I am looking for :

">full strain soft-robot hyper-elastic actuator - YouTube