Experimental investigation on the energy absorption and contact force of unstiffened and grid-stiffened composite cylindrical shells under lateral compression /Majid Moeinifard a , Gholamhossein Liaghat a,b, ⇑ , Gholamhossein Rahimi a , Ali Talezadehlari a , Homayoun Hadavinia b - Moeinifard,Majid