摘要
针对金属结构失效中,超过80%都是由疲劳引起的现象,以压力容器中的开孔接管结构为例,用ANSYS软件对其进行弹性和弹-塑性分析。根据有限元分析结果,分别采用ASMEⅧ-2规范和EN 13445规范中的方法进行疲劳评定。比较各种疲劳设计方法得到的许用循环次数与试验寿命,讨论异同和适用性。结果表明:规范中的疲劳评定方法预测的寿命都小于试样的实际寿命。ASMEⅧ-2弹-塑性分析法和EN 13445详细评定法得出的疲劳寿命最接近实际值。
Over 80% of metal structural failure is caused by fatigue. In opening nozzle case,the parametric model of pipe connection structure was established by ANSYS. According to the results of elastic and elastic-plastic stress analysis,fatigue assessments were carried out respectively with the methods of ASME Ⅷ-2 code and EN 13445 code.Detailed comparison of fatigue life was made between numerical simulation and fatigue experiment. The results show that all the permissible numbers of cycles obtained from different assessment methods are less than the actual life of specimen. The elastic stress analysis method from ASME Ⅷ-2 code and the detailed assessment of fatigue life from EN13445 code are closer to the test value than others.
出处
《轻工机械》
CAS
2016年第2期42-48,共7页
Light Industry Machinery
