活塞有限元分析及形状几何因子的拟合  

A FEM Analysis and Fitting of Geometry Shape Factor to a Piston

作　　者：石海燕[1] 袁晓亮 王延遐[1] 

机构地区：[1]山东理工大学交通与车辆工程学院,山东淄博255049 [2]颐中(潍坊)实业公司,山东潍坊261200

出　　处：《农业装备与车辆工程》2008年第10期9-12,共4页Agricultural Equipment & Vehicle Engineering

摘　　要：利用"自上而下"的子结构模型法添加裂纹体,并通过ANSYS中的J积分,计算了机械应力场中一组裂纹的应力场强度因子值。计算值与应力强度因子手册中给出的理论值非常吻合,最大误差不超过6%。并利用最小二乘法,拟合出活塞形状几何因子的表达式。计算结果对活塞的疲劳可靠性分析提供了理论基础。A crack body has been added to the FEM model by using substructure model method from top to bottom, and the stress field intensity factor of a group of cracks in machinery stress field has been calculated. The calculated value is match to the theoretical value and largest error is not big than 6%. The expression of piston geometry shape factor has been fitted by using Least squares method. The obtained result is helpful to the fatigue analysis of piston.

关 键 词：应力强度因子 疲劳 裂纹 活塞 有限元分析 

分 类 号：TH123.4[机械工程—机械设计及理论]