摘要
为了提高连接件疲劳寿命分析的预测精度,对应力严重系数(SSF)法中存在的问题进行了研究和改进。依据连接件疲劳破坏现象,将连接件的疲劳破坏危险点定义在垂直于总体载荷的孔边。对连接件进行了接触有限元分析,考虑了三维应力集中与二维应力集中之间的折算关系,获得了危险点处的挤压应力集中系数和挤压分布系数,并由此获得了改进的SSF法。应用改进的SSF法完成了两个连接件算例,结果表明改进后疲劳寿命的预测精度有所提高。
In the present work,a few problems existing in the stress severity factor（SSF） approach used for the fatigue life analysis of joints were studied and an improvement of the approach was accomplished.Based on the observation of the fatigue damage failures,the point at the edge of the hole which is vertical to the overall loading direction was defined to be the fatigue damage dangerous point.2D and 3D contact finite element analyses of the joints were carried out.Taking into consideration of converting relation between the three-dimension stress concentration and the two-dimension stress concentration,the extrusion stress concentration factor and extrusion distribution factor were gotten,and thus the modified SSF approach was obtained.Two examples of the fatigue life analysis of joints were accomplished using the modified SSF approach and the results demonstrated that this modified SSF approach gives a more accurate prediction for the fatigue life.
出处
《机械科学与技术》
CSCD
北大核心
2012年第5期855-860,共6页
Mechanical Science and Technology for Aerospace Engineering
关键词
连接件
疲劳寿命
应力严重系数
接触算法
三维应力集中
joints
fatigue life
stress severity factor
contact algorithm
three-dimension stress concentration
