盐雾环境对复合材料修复铝合金板疲劳性能的影响  

Impact on Fatigue Properties by Salty Spray of Bonded Composite Repair of Aluminum Substrates

作　　者：王跃然[1] 肖加余[1] 肖希海[2] 曾竟成[1] 江大志[1] 邢素丽[1] 

机构地区：[1]国防科技大学航天与材料工程学院 [2]中国人民解放军61213部队

出　　处：《航空材料学报》2010年第5期67-72,共6页Journal of Aeronautical Materials

摘　　要：采用单向碳/环氧复合材料补片真空袋压工艺单面修复含中心裂纹铝合金板,进行0-1700h盐雾梯度腐蚀试验,测试并对比分析了各腐蚀时间结点上试件修复前后的疲劳性能,从疲劳寿命、疲劳临界裂纹长度和Paris公式材料常数(C和m)的变化三个方面考察不同盐雾腐蚀深度对铝合金裂纹板修复前后的疲劳性能差异。结果表明:碳/环氧补片胶接修复铝合金板能大幅度提高疲劳寿命,且未经修复的裂纹板在腐蚀1700小时后疲劳寿命下降53.8%,而修复板仅为38.6%。修复板疲劳裂纹临界长度acr大于未修复裂纹板,且随盐雾腐蚀时间延长,裂纹板和修复板acr变化不大,可作准判据使用。由试验数据得到的不同腐蚀时间上试样的材料常数C和m随腐蚀时间延长而减小。利用Paris公式可较好拟合铝合金板疲劳寿命及Paris区内的疲劳裂纹扩展行为,但疲劳寿命预测值与实际值的差异由未经腐蚀时的5%左右增大到腐蚀1500h时的10%左右。Taking vacuum bag techniques for patches of carbon fiber/epoxy（Cf/ epoxy） composites,this study tested the corrosion fatigue properties of bonded and non-bonded aluminum alloy plate with different time of salty spray.The fatigue life,critical crack length and constant C and m in the Paris law are investigated under different corrosion time.The results show that bonded Cf / epoxy patches repair increase fatigue life.After 1700h＇s corrosion,the fatigue life of non-bonded center-cracked aluminum alloy decreases by 53.8%,while the bonded ones only by 38.6%.The critical crack length turns longer after bonding.Along with the extending of corrosion,the critical crack dimension of bonded and non-bonded aluminum alloy change little.Both constant C and m in Paris law depress with the extending of corrosion.Paris law is suitable to predict the fatigue life and the behavior of crack-growth in the region of Paris,but the errors between prediction and experiment increase form 5%（0h） to 10%（1500h）.

关 键 词：复合材料修复 铝合金 疲劳性能 盐雾 

分 类 号：TB332[一般工业技术—材料科学与工程]