玻璃纤维-铝合金层合板补强拉伸性能及破坏机理研究

对含预置孔缺陷的玻璃纤维-铝合金层合板修补前后进行了拉伸试验,讨论了拉伸过程中载荷随拉伸位移的变化趋势,并分析了补强片对于材料拉伸强度的影响及断裂破坏形式。结果表明,修补前后的玻璃纤维-铝合金层合板在拉伸过程中均经历了屈服阶段,修补后的层合板表现出了更明显的屈服现象,且载荷在破坏前出现了较大波动,孔直径为6 mm、10 mm、12 mm的缺陷试样在补强后的极限强度修复率分别为17.7%、13.2%、20.6%,补强片使层合板在拉伸破坏后在断裂位置呈现双扇形损伤,补强片的破坏为胶膜的剪切破坏,破坏界面位于铝合金表面。

RESEARCH OF REPAIRING PERFORMANCE AND FAILURE MECHANISM OF GLASS FIBER-ALUMINUM LAMINATES

The tensile test was carried out before and after the repairing of the glass fiber-aluminum laminates with presetting hole defects.The influence of the load on the tensile displacement during the stretching process was discussed,and the influence of the reinforcing sheet on the tensile strength of the material was analyzed.The results show that all the glass fiber-aluminum laminates have experienced the yield stage,the repaired laminates exhibit a more obvious yield phenomenon,and the load fluctuates greatly before the damage.The ultimate strength of the repair rate was 17.7％,13.2％,20.6％,respectively,for the aminates,containing 6 mm,10 mm,12 mm hole defects.Due to the repairing plates,the laminates showed double fan damage in the fracture position after the tensile fracture.The damage form of the repairing plates was shear failure of the film,which occurred on the surface of the aluminum alloy.