基于有限元分析的DFR法  

DFR Method Based on Finite Element Analysis

作　　者：陈滨琦[1] 曾建江[1] 贾建东[2] 童明波[1] 

机构地区：[1]南京航空航天大学飞行器先进设计技术国防重点学科实验室,南京210016 [2]成都飞机工业(集团)有限责任公司技术中心,成都610091

出　　处：《南京航空航天大学学报》2012年第6期888-892,共5页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：以名义应力为参数量的细节疲劳额定值(Detail fatigue rating,DFR)法进行疲劳可靠性分析的关键之一在于获取钉孔附近真实的名义应力,解析法难以分析复杂结构和载荷下的应力分布,不便于工程应用。本文参考了连接件及周边平衡载荷系的等效方法,提出了用于DFR法分析的有限元法名义应力的求解。编制了基于有限元分析的DFR法分析软件FEM-DFR,对MSC.Nastran输入输出文件进行后处理,自动完成DFR法疲劳寿命的相关计算。算例结果表明本文提出的基于有限元分析的DFR法算法合理,编制的FEM-DFR软件通用、有效。The real nominal stress around pin holes is the key to fatigue reliability analysis using detail fa- tigue rating （DFR） method. The stress cannot be obtained easily by analytical method under complex structures and loading boundaries. Therefore analytical method is not convenient for engineering appli- cations. A new method for calculating the nominal stress is raised based on equivalent method of loads balance system in the region of the hole. To get the true nominal stress, finite element method is applied to DFR method. Setting an interface with MSC. Nastran, a fatigue reliability calculating software, which termed FEM-DFR, is given. The results show that the fatigue life estimation is in agreement with the experimental data, and the software is universal and effective.

关 键 词：疲劳可靠性 细节疲劳额定值 有限元 名义应力 

分 类 号：V222[航空宇航科学与技术—飞行器设计]