Quasi-static axial crushing experiment study of foam-ﬁlled CFRP and aluminum alloy thin-walled structures /Nianfei Gan a,b , Yanan Feng a , Hanfeng Yin a,b , Guilin Wen a,b, ⇑ , Duohua Wang a , Xinyi Huang a - Gan,Nianfei