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缺陷对单搭胶接接头力学性能的影响

, PP. 157-163

Keywords: 单搭胶接接头,缺陷,破坏模式,单向板,拉伸试验

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Abstract:

通过单向拉伸试验对比分析了两种接头的破坏模式及载荷-位移曲线,研究了T700/TDE85复合材料单向层合板单搭接胶层内缺陷对接头破坏行为的影响。试验结果表明,接头破坏的主导模式为界面破坏,胶层中微小缺陷对接头强度的影响不大。为研究接头的失效机制,采用有限元方法对两种接头失效进行数值分析,模拟了接头搭接区界面剥离应力及剪切应力分布情况,并分析了缺陷位置变化及面积变化对接头强度的影响。结果表明,随着缺陷位置距接头搭接区自由端部越近,接头强度越小,且缺陷位置距接头搭接区自由端部2.5mm以内,缺陷对接头强度影响较大;接头强度随缺陷面积的增大而减小,并且缺陷面积占搭接区面积的比率在4.4%以内,缺陷对接头强度的影响较小;数值计算结果与实验结果吻合较好。

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