The Anisotropy Effect of Closed-Cell Polyisocyanurate (PIR) Rigid Foam under Quasi-Static Compression Loads

摘要

Lightweight polymeric cellular materials are increasingly used in many industrial applications because of their height mechanical and energy absorption properties. This paper investigates the effect of foam anisotropy under quasi-static compression tests. A 35 kg/m~3 closed-cell rigid Polyisocyanurate (PIR) structural foam was tested in the experimental programme with a loading speed of 10 mm/min. Experimental results show that the investigated foam presents a highlighted anisotropic behavior and the main mechanical properties such as Young's modulus, yield stress, plateau stress and onset strain of densification varies with changing the loading direction. In addition, during compression, the energy absorption performance of PIR foam is strongly affected by the anisotropy.