摘要
针对O形圈处在高温工况容易发生热膨胀及应力松弛并导致失效的情况,利用有限元软件分析比较考虑温度时和不考虑温度时O形圈的应力及应力随着时间的松弛情况,并使用响应面法,计算出O形圈的剪切破坏失效、密封失效及多失效的可靠度。结果表明:高温对O形圈的应力分布和松弛速率的影响很大;O形圈的剪切破坏可靠度及泄漏失效可靠度随时间呈下降趋势,初期会发生急剧下降而后期下降速度减小;O形圈的多失效可靠度前期急剧减小然后基本达到稳定,表明O形圈在使用初期没有发生失效,则其在后期发生失效的概率较低。
Aimed at the failure of the O-rings caused by thermal expansion and stress relaxation under the high tempera-ture working condition,both the stress and its time varying relaxation of O-rings were studied by taking and not taking the temperature into consideration.The reliability degree of shear failure,sealing failure and multiple failure was discussed by using the response surface method.The results indicate that high temperature has a great influence on the stress distribution and relaxation speed of O-rings.The reliability degree of shear failure and sealing failure is in a downward trend with time, which is decreased rapidly at the initial stage and then decreased slowly to be stable.The reliability degree of multiple fail-ure is decreased sharply at the beginning and then becomes steady,indicating that the o-rings will have a low probability of failure if they are judged not fail in the early stage.
出处
《润滑与密封》
CAS
CSCD
北大核心
2014年第12期63-68,共6页
Lubrication Engineering
基金
中国博士后科学基金项目(2013M542387)
关键词
O形圈
应力松弛
剪切失效
泄漏失效
可靠性
O-ring
stress relaxation
shear failure
sealing failure
reliability
