Based on your description, i guess you want to model foam or some type of particel composite. There are two basic approaches as follows n1) Microstructure n2) Material Homogenisation Material modelnMicrostructure Method involves creating the RVE using procedural design offered in Grasshopper plugin, dynamo or by creating some python scriptsnMaterial Homogenisation involves using the test data of foam or particle composite and use an material model to analyse the response. This method is fast and effective and easy for beginners.nChoose a method and comment down for better support in furthernCheers nRamn