DFR法在结构疲劳优化设计中的应用

 提出了基于有限元分析的细节疲劳额定值(DFR)疲劳可靠性分析方法,将有限元分析与疲劳分析进行关联,编写基于有限元分析的DFR法分析软件(FEM-DFR),对试验件进行疲劳寿命分析,与试验对比吻合较好,验证了方法的准确性。在此基础上,针对疲劳优化周期长和效率低的问题,开发了集成Patran/Nastran、FEM-DFR和iSIGHT的疲劳优化平台,在此平台上完成了某型飞机作动筒支座细节的优化,该平台数据传输流畅、操作效率高、优化质量好,具有一定的工程应用价值。

Application of DFR Method to Optimal Fatigue Design of Structures

A new method to analyze fatigue reliability based on detail fatigue rating (DFR) is presented which integrates finite element analysis and fatigue analysis. Fatigue reliability calculating software (FEM-DFR) is written with the help of finite element analysis. The agreement between the simulation results calculated by FEM-DFR and the experimental data proves the effectiveness of the method. On this basis, a general platform which integrates Patran/Nastran, FEM-DFR and iSIGHT is developed to overcome the shortcomings of long time-consumption and low efficiency of structure fatigue optimization. A detailed bracket of an actuator cylinder is optimized on the platform. The results show that the platform is stable, data transmission is smooth, operational efficiency is high, and the optimized quality is good.