DAMAGE TOLERANCE AND FATIGUE LIFE ESTIMATION FOR PIPE/ROD BAR STRUCTURE

作     者：Dura Hari Bahadur 吴铁鹰 吴志功 Dura Hari Bahadur;Wu Tieying;Wu Zhigong

作者机构：南京航空航天大学能源与动力学院 

出 版 物：《Transactions of Nanjing University of Aeronautics and Astronautics》 (南京航空航天大学学报（英文版）)

年 卷 期：2011年第28卷第2期

页      面：169-175页

核心收录：

学科分类：08[工学] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）] 

主　　题：fatigue crack propagation circumferential crack stress intensity factor pipe/rod bar 

摘      要：The damage tolerance for pipe/rod bar in the auxiliary power units （APUs） support system is studied. The main objective is to study whether planes can safely land when the fatigue crack appears on the bar. Firstly, the stress intensity factors （K~） of two bar structures are computed, and the iso-stress intensity factor （iso-Kl） model is presented. The model uses the finite element model （FEM） instead of the parameters of material to com- pute the crack propagation. Then, the general relations between Kt vs crack size are obtained for different mate- rials, inner to outer diameter ratios （D^n/Dout） and external crack propagation angles （0）. Finally, the FEM anal- ysis results are input to the ANSYS parametric design language（ANSYS-APDL） software. And the fatigue life of damaged bar is estimated under the condition of loading spectrum.