基于SiPESC的焊缝疲劳分析模块开发

Design and development of weld fatigue analysis based on SiPESC

焊缝处由于存在应力集中、焊接缺陷、残余应力等影响,是焊接结构的疲劳薄弱环节。结构应力法相较于传统的疲劳评估方法,具有SN曲线数据离散性小、网格不敏感等特点,已被纳入ASME标准。国内对结构应力法的应用基本为直接使用国外商业疲劳分析软件fesafe或对商业有限元软件进行二次开发。本文基于SiPESC平台开发了结构应力法焊缝疲劳分析模块,程序具备了雨流计数法,SN材料库,损伤累积,单通道及多通道载荷谱定义,平均应力修正等通用疲劳分析功能,具有一定的通用性。同时,结构应力法模块可支持同阶数同自由度混合壳或实体单元焊缝定义,支持焊线处节点单元自动排序。后续的其他算法和功能可在SiPESC平台通过插件的方式动态添加,具有良好的开放性。通过与国外商业软件的算例结果对比,验证了本文所开发的程序计算结果的精确性。

Due to the influence of stress concentration , welding defects and residual stress , the welding seam is theweak point of the welding structure. Compared with the traditional fatigue assessment method , the structural stressmethod has the characteristics of smaller SN curve data dispersion and less grid sensitivity , and has been includedin the ASME standard. Domestic application of structural stress method is basically to directly use foreign commer­cial fatigue analysis software fesafe or secondary development of commercial finite element software. Based onSil^ESC platform , this paper developed a fatigue analysis module of weld seam based on structural stress method. The program has such general fatigue analysis functions as rain flow counting method , SN material database , dam­age accumulation , single channel and multi-channel load spectrum definition , average stress correction and so on ,which have certain universality. At the same time , the strjictural stress method module can support the definition of welding seam of mixed shell or solid element with the same order and degree of freedom , and support the automatic sequencing of node element at welding line. The following other algorithms and functions can be added dynamically in SilESC platform by means of plug-in , which has good openness. Compared with the results of commercial soft-ware in other countries, the accuracy of the program developed in this paper is verified.