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基于空气炮冲击试验装置在不同冲击角度下进行了TC4钛合金平板试件的外物损伤模拟试验,采用逐级加载试验方法测试获得了光滑和冲击损伤试件的高循环疲劳(high cycle fatigue,HCF)强度,研究了冲击角度、冲击位置以及冲击损伤宏观几何尺寸与HCF强度的关系.结果表明:不同冲击角度下的损伤对HCF强度的影响程度不同.冲击损伤在试件边缘时,30°冲击使试件HCF强度的下降幅度最大;冲击损伤在试件表面时,60°冲击使试件HCF强度的下降幅度最大.试件边缘产生的缺口使HCF强度的下降幅度一般大于试件表面产生弹坑的影响.但在60°冲击时,冲击缺口损伤的影响要小于冲击弹坑损伤的影响.冲击损伤宏观几何尺寸一定程度上可以表征损伤试件HCF强度下降的严重程度.
Based on the air gun impact test device, the damage simulation test of TC4 titanium alloy flat plate was carried out under different impact angles. The high cycle fatigue of the smooth and impact damaged test piece was obtained by the step loading test. HCF), the relationship between impact angle, impact position and macro-geometry of impact damage and HCF strength was studied.The results show that the impact of different impact angles on the strength of HCF is different.The impact damage at the edge of the specimen, 30 ° The maximum decrease of HCF strength was observed when impact damage was applied on the surface of specimen, and the largest decrease of HCF strength was observed by 60 ° impact on the specimen surface. The notch at edge of specimen decreased HCF intensity more than the surface of specimen However, at 60 ° impact, the impact of impact notched damage is smaller than that of impact crater. The macroscopic geometry of impact damage can characterize the severity of HCF intensity decrease to a certain extent.