排序方式: 共有4条查询结果,搜索用时 15 毫秒
1
1.
The constitutive equation under the low-cycle fatigue (LCF) was discussed, and a two-dimensional (2-D) model for simulating fatigue crack extension was put forward in order to propose a new cyclic J-integral. The definition, primary characteristics, physical interpretations and numerical evaluation of the new parameter were investigated in detail. Moreover, the new cyclic J-integral for LCF behaviors was validated by the compact tension (CT) specimens. Results show that the calculated values of the new parameter can correlate well with LCF crack growth rate, during constant-amplitude loading. In addition, the phenomenon of fatigue retardation was explained through the viewpoint of energy based on the concept of the new parameter. 相似文献
2.
3.
4.
弯曲载荷作用下,双槽圆形截面管的角裂纹具有两个不同的奇异应力场和相应的应力强度因子,针对该异型薄壁管裂纹问题,提出了一种简单实用的应力强度因子求解方法。即利用守恒律,通过选取适当的三维积分路径,并结合初等力学的应力位移计算方法,显化了应力强度因子对J_2积分的贡献,建立了一个求解应力强度因子的方程。由于该方程不足以求解两个应力强度因子,利用材料力学平截面保持平面的变形假设,建立了应力强度因子之间的补充方程。将J_2积分与补充方程联立求解,既可得到弯曲载荷作用下双槽圆形截面管角裂纹的应力强度因子。对于其他异型薄壁管裂纹问题,该方法同样适用,计算过程简单。 相似文献
1