复合材料孔板在湿热环境下的力学性能研究

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

研究了湿热环境对中心开孔复合材料层压板力学性能的影响。通过试验测定了室温和湿热环境下铺层为[45/45/90/0]s的玻璃纤维(MXB7701/7781)复合材料层压孔板的极限压缩破坏载荷及破坏应力,并对试验结果进行了数理统计处理分析;探讨了湿热环境对复合材料孔板强度及压缩设计许用值的影响。结果表明,湿热会降低由基底性能主导的压缩强度、刚度等复合材料性能,吸湿后70℃环境下试验件压缩强度保持率约为85%,破坏应力基准值保持率约为83%,环境因子约为1.2。因此,该复合材料孔板在湿热环境下具有较高的压缩力学性能保持率,仍具备良好的力学性能。

The basic static meehanical 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.