I would like to model a sandwich structure of a barge cover made by powder impression moulding. It involves a skin of polyethylene with a polyethylene foam core. I would like to model its rigidity to model its sagging behaviour and see whether design changes can be made to stiffen the structure while still this PE & PE foam construction.
In terms of characterizing behaviour of foam which tests would be best applied? Compression, tension and shear enough under different strain rates/temperatures? I have read somewhere that a volumetric compression test is useful data for foams, is this true?
Any advice would be most helpful.