基于ANSYS的焊接结构疲劳强度分析

摘要

针对焊接结构不同焊接接头具有不同的疲劳强度许用应力,根据焊接接头的形状与应力集中情况将焊缝与母材分为不同的等级,基于DIN15018-1报告给出的疲劳强度评定方法确定了不同等级的焊缝和母材的最大应力、最小应力、平均应力、应力比、应力幅和疲劳安全系数.提出了对于ANSYS平台的结果文件进行二次开发.通过FORTRAN语言编程提取出ANSYS结果二进制文件中所存储的方向应力,依据特定疲劳标准选行疲劳分析,并且将疲劳强度分析的结果数据放入ANSYS的结果文件中,实现在ANSYS平台的后处理模块中示疲劳强度的分析结果,提高疲劳强度分析结果的可视性.%In consider of the fact that different welding joints have different fatigue permissible stresses weld zone and metal base are divided into various levels depending on the shape of welding joints and the stress concentration situation.According to the method to evaluating fatigue strength which is given by DIN 15018-1 report,maximum stress,minimum stress,average stress,stress ratio,stress amplitude and factor of safety are calculated.The secondly development of the result file which is provided by ANSYS is raised.The nodal component stresses in result file are extracted and calculated by programming in FORTRAN language,according to specific fatigue design standard the results of analyzing fatigue strength are worked out,and the results of analyzing fatigue strength are written back into result file.The results of analyzing fatigue strength are displayed by post processing module of ANSYS.The second development which is described in this article has improved the visibility of the results of analyzing fatigue strength.