复合材料修复含中心裂纹铝合金薄板和厚板破坏模式研究

采用T300碳纤维增强环氧树脂复合材料补片单面修复含中心裂纹铝合金(LY12CZ)板,板厚为1.76mm和5.20mm.测试了修复试件准静态拉伸和疲劳性能,分析了修复试件的准静态和疲劳破坏模式,考察了裂纹长度对修复效果的影响.结果表明:厚度为1.76mm修复试件的拉伸破坏是由补片与铝合金板之间的胶黏剂层脱粘控制,而厚度为5.20mm修复试件是由铝合金板中的裂纹扩展控制.对于厚度为1.76mm修复试件,其准静态拉伸性能随裂纹长度增大而降低,而疲劳性能随裂纹长度增大而提高.然而,厚度为5.20mm修复试件的准静态拉伸和疲劳性能均随裂纹长度增大而降低.

Tensile Fracture Mode of the Damaged Thin and Thick Aluminum Plates Repaired with Composite Patches

The present study investigated the quasi-static tensile and fatigue properties of the center-cracked thin and thick aluminum plate single-side repaired with T300 carbon fiber reinforced epoxy composite patches. The repair efficiency of the damaged thin and thick aluminum plates was compared with the tensile and fatigue properties, and the effect of the initial crack length on the properties of the repaired specimens was studied. Then, the tensile fracture mode of the repaired specimens was analyzed. The results have shown that the repair efficiency of the thin aluminum plate is far higher than that of the thick aluminum plate, and the tensile fracture mode of the repaired specimens has two kinds: the crack growth of the aluminum plate in the repaired specimen and the adhesive debond between the patch and the aluminum plate.