Fatigue behavior of aluminum stiffened plate subjected to random vibration loading  

随机振动加载条件下铝合金加筋板的疲劳行为(英文)

作　　者：胡海涛[1] 李玉龙[1] 索涛[1] 赵峰 苗应刚[1] 薛璞[1] 邓琼[1] 

机构地区：[1]西北工业大学航空学院,西安710072 [2]顶峰多尺度科学研究所,成都610064

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第5期1331-1336,共6页中国有色金属学报（英文版）

基　　金：Project(10932008)supported by the National Natural Science Foundation of China;Project(B07050)supported by the Program of Introducing Talents of Discipline to Universities(111 Project),China;Project(2012GY2-26)supported by the Key Industry Program of Shaanxi Province,China

摘　　要：Vibration tests were carried out on three types of stiffened aluminum plates with fully clamped boundaries under random base excitation. During the test, the response of the specimens was monitored using strain gauges. Based on the strain history, the accumulation of fatigue damage of the stiffened plates was estimated by means of the rainflow cycle counting technique and the Miner linear damage accumulation model in the time domain. Utilizing the change of natural frequencies, a nonlinear model was fitted for predicting the fatigue damage of plate and then the foregone failure criterion of 5% reduction in natural frequency is improved. The influence of section and spacing of the stiffeners on the vibration fatigue behavior of the aluminum plate was investigated. The results show that the fatigue life of aluminum plate increases with adding either T or L section riveted stiffeners. With the same cross-sectional area of stiffener, the T section stiffened plate shows longer fatigue life than L section stiffened plate. Meanwhile, the vibration fatigue life also shows great sensitivity to the spacing between the stiffeners.基于基础激励对固支的3类铝合金加筋板进行振动测试。测试过程中采用应变片监测试样的动态响应。在应变历程的基础上用雨流计数法和Miner线性累积模型得到时域内加筋板的疲劳累积损伤。利用固有频率的改变,拟合用于预测板结构疲劳损伤的新模型,改进先前固有频率下降5%的失效判据。同时,还研究了筋条截面形状与筋间距对铝合金板振动疲劳行为的影响。结果表明,加装T型或L型截面的铆接筋条后铝板的疲劳寿命延长,对于筋条截面积大小相同的筋条,T型截面筋条的加筋板其疲劳寿命长于L型的。此外,振动疲劳寿命表现出对筋间距的敏感性。

关 键 词：stiffened plate vibration fatigue vibration test fatigue life natural frequency 

分 类 号：TG146.21[一般工业技术—材料科学与工程]