Effects of hygrothermal environment on static properties of laminated composites with a circular open hole

The basic static mechanical properties of 8-ply glassfiber composite laminates with a circular open hole are tested in hygrothermal conditions.The ultimate compression failure loads and failure stresses are obtained using the standard test method for open-hole compressive strength of composite laminates.The influences of hygrothermal environmental are analyzed based on statistic methodology.The results show that the retention rate of compressive strength and basis value of failure stresses are about 85% and 83% respectively.The environmental factor is about 1.2.Therefore,the studied fiberglass composite material MXB7701/7781 can keep good mechanical properties in hygrothermal environment.