复合材料胶接修理对含腐蚀损伤铝板力学性能的影响

目的研究复合材料胶接修理对含腐蚀损伤铝板静强度和疲劳寿命的影响。方法设计加工模拟铝合金腐蚀损伤的试验件,采用复合材料胶接修理技术对试验件进行修理,通过有限元分析和试验验证的方法考核该修理技术对试验件力学性能的影响。结果有限元计算结果表明,复合材料胶接修理技术能够有效缓解试验件的应力集中情况。试验件修理后与修理前的对比静强度和疲劳试验结果表明,Ⅰ型试验件的破坏载荷提升了45.9%,疲劳寿命增加了9.3倍;Ⅱ型试验件的破坏载荷提升了11.4%,疲劳寿命增加了3.6倍。结论复合材料胶接修理技术是一种高效的飞机铝合金结构腐蚀损伤修理方法。

Effects of Composite Patching on the Mechanical Properties of the Corroded Aluminium Plates

Objective To study the effects of adhesively bonded composite patching on the static strength and fatigue life of corroded aluminum plates. Methods Specimens were designed and fabricated to simulate corroded aluminum plates. The specimens were repaired by adhesively bonded composite patches. The effects of composite patching on the mechanical properties of the specimens were studied by finite element analysis (FEA) method and mechanical test. Results The FEA results showed that the stress concentration in the repaired specimen was greatly reduced. The static and fatigue data indicated that there was a 45. 9% increase in the fracture load of specimen type I, and that the fatigue life was multiplied 10. 3 times after the composite repair. The fracture load of repaired specimen type II increased 11. 4% , and the fatigue life was 4. 6 times longer than that of the unrepaired specimen. Conclusion Adhesively bonded composite patching was proved to be an effective method to repair corroded aircraft aluminum structures.