Structural modeling and mechanical behavior of Metal-Porous- Polymer-Composites (MPPCs) with different polymer volume fractions /Yishi Su a , Zhiqiang Li a , Xiaolu Gong b , Qiubao Ouyang a , Qiang Guo a , Cuiping Guo a , Jie Zhang a , Di Zhang a, ⇑ - Su,Yishi