论文部分内容阅读
采用单向硼/环氧复合材料补片真空袋压工艺单面修复含中心裂纹不同厚度铝合金板,测试了修复试件的疲劳性能,从疲劳寿命、疲劳裂纹扩展速率和裂纹扩展纹线考察不同厚度铝合金板修复后疲劳性能的差异。结果表明:硼/环氧补片胶接修复后,铝合金板的疲劳寿命大幅度提高,且疲劳寿命提高幅度随铝合金板厚度增大而降低。厚度为1.76 mm、5.20 mm和10.20 mm 3种铝合金板修复试件的疲劳寿命分别是未修复试件的22.30倍、12.84倍和8.40倍。厚度为1.76 mm铝合金板修复试件在铝合金板完全断裂后还能继续承担疲劳载荷,而厚度为5.20 mm和10.20 mm 2种铝合金板修复试件在铝合金板断裂后完全破坏。裂纹扩展速率和归一化裂纹长度差均随铝合金板厚度增大而增大。
The uniaxial boron / epoxy composite vacuum bagging process was used to repair single-sided aluminum alloy plates with different thickness of central crack. The fatigue properties of the repaired samples were tested. The fatigue life, fatigue crack growth rate and crack propagation were investigated Difference in fatigue properties of aluminum alloy plates with different thickness after repair. The results show that the fatigue life of the aluminum alloy plate increases greatly after the boron / epoxy patch is bonded and repaired, and the fatigue life increase rate decreases as the thickness of the aluminum alloy plate increases. The fatigue life of the three kinds of aluminum alloy plates with thickness of 1.76 mm, 5.20 mm and 10.20 mm were 22.30 times, 12.84 times and 8.40 times that of the uncorrected pieces respectively. The thickness of 1.76 mm aluminum alloy plate repair specimens can continue to bear the fatigue load after the aluminum alloy plate is completely broken, while the thickness of 5.20 mm and 10.20 mm 2 kinds of aluminum alloy plate repair test pieces completely rupture after the fracture of the aluminum alloy plate. Both the crack propagation rate and the normalized crack length increase with increasing thickness of the aluminum alloy plate.