滚压钛合金导管振动疲劳特性分析  

Vibration Fatigue Properties Analysis of Titanium Alloy Tubes Connected by Rolling

作　　者：邵闯[1] 李益萱[1] 邱明星[2] 吴为[3] 

机构地区：[1]中航工业中国飞机强度研究所 [2]中航工业沈阳发动机设计研究所 [3]中航工业北京航空制造工程研究所

出　　处：《航空制造技术》2014年第19期98-101,共4页Aeronautical Manufacturing Technology

摘　　要：按照振动疲劳试验方法和失效准则进行了滚压连接形式的钛合金导管振动疲劳极限寿命测试,利用激光位移传感器测试自由端位移,用电阻应变计测定了试件根部的应变,根据位移和应变响应谱确定试件第一阶频率,并进行定频振动疲劳极限测试。预试验发现,试件第一阶响应频率随载荷增加发生明显下降(超过1%)。为满足产品定寿要求,采用递进式扫频试验,消除滚压试件的连接间隙,直至试件频率响应稳定,再进行定频振动疲劳试验。通过此次测试得到滚压连接的钛合金导管在2×107循环基数,可靠度为95%时的振动疲劳极限为115MPa。Tile fatigue limit testing of titanium alloy tubes connected by rolling is carried out according to the vibration fatigue test method and the failure rule. Tile amplitude of the free end of the specimen and the boot strain of the specimen are measured. The sine-fixed- 17equency method is used to do the vibration fatigue limit test. Because of the effects of rolling connected properties, the first resonance frequency declines obviously （exceed- ing 1%）. In order to define the lives of the rolling tubes, the stair method of sweep test is used to remove the effect of connection gap, and then the vibration fatigue of every specimen is tested at the last resonance frequency. The testing results show that the vibration fatigue limit of the rolling tube is l l5MPa at 2 × 107 cycles under 95% reli- ability.

关 键 词：振动疲劳 疲劳极限 扫频 定频 

分 类 号：TH113.1[机械工程—机械设计及理论]