摘要
干涉配合是提高螺栓连接疲劳寿命的有效工艺方法,针对钛合金高锁螺栓的干涉配合静态压入过程,建立有限元模型并进行数值模拟。分析不同干涉量下螺栓上最大应力、孔壁上最大应力值和叠层板上应力分布特点。结果表明,采用静态压入方法的最大干涉量为2.0%,并分析塑性区随干涉量的变化特点及数值模拟结果中的凸瘤大小。在数值模拟的基础上进行高锁螺栓液压压入试验,通过对比试验和模拟压入力的峰值、历史曲线和孔出口处凸瘤大小,有限元模拟得到了验证,利用有限元结果分析带孔边压痕的试验件孔口易产生裂纹的根本原因,并分析试件孔口凸瘤范围大小对结构疲劳磨损的影响,得出干涉量不宜超过2.0%。
Interference fit is an effective process method for improving fatigue life of bolted joints. The finite element model （FEM） is developed and the process of oversized titanium alloy hi-lock bolt pressed into a hole is simulated. At different interference fit size, the maximum stress values on hi-lock bolt and hole wall and the stress distribution characteristics of lap plates are presented, the simulation result shows that maximum interference fit size is 2.0% for hi-lock bolt static installation, then the law of plastic zone size and protuberance size on lap plates with the interference fit size increasing are also investigated. Base on the numerical simulation, the experimental test of hi-lock bolt installation is done, by the comparison of test result and simulation prediction on squeeze force and protuberance height at hole exit, the numerical simulation is validated. The reason of cracking or latency crack at hole exit of specimen having the concavity around holes is studies, and the experimental protuberance scope size effected on the fatigue fretting of bolted joints is also analyzed, which shows that the interference-fit size should be less than 2.0%.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第3期145-152,共8页
Journal of Mechanical Engineering
基金
国家自然科学基金(51275463)
中央高校基本科研业务费专项科研基金(2011FZA4002)资助项目
关键词
高锁螺栓
干涉配合
数值模拟
最大应力
凸瘤
Hi-lock bolt
Interference fit
Numerical simulation
Maximum stress
Protuberance
