Creep life assessment of aero-engine recuperator based on continuum damage mechanics approach  

作　　者：Pengpeng LIAO Yucai ZHANG Guoyan ZHOU Xiancheng ZHANG Wenchun JIANG Shantung TU 

机构地区：[1]Key Laboratory of Pressurized System and Safety,MOE,School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China [2]State Key Laboratory of Heavy Oil Processing,College of Chemical Engineering,China University of Petroleum(East China),Qingdao 266555,China

出　　处：《Frontiers of Mechanical Engineering》2022年第4期273-284,共12页机械工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51675181);grateful for the Innovation Program of Shanghai Municipal Education Commission,China(Grant No.2019-01-07-00-02-E00068)。

摘　　要：The creep life of an aeroengine recuperator is investigated in terms of continuum damage mechanics by using finite element simulations.The effects of the manifold wall thickness and creep properties of brazing filler metal on the operating life of the recuperator are analyzed.Results show that the crack initiates from the brazing filler metal located on the outer surface of the manifold with the wall thickness of 2 mm and propagates throughout the whole region of the brazing filler metal when the creep time reaches 34900 h.The creep life of the recuperator meets the requirement of 40000 h continuous operation when the wall thickness increases to 3.5 mm,but its total weight increases by 15%.Decreasing the minimum creep strain rate with the enhancement of the creep strength of the brazing filler metal presents an obvious effect on the creep life of the recuperator.At the same stress level,the creep rupture time of the recuperator is enhanced by 13 times if the mismatch between the minimum creep rate of the filler and base metal is reduced by 20%.

关 键 词：CREEP life assessment brazed joint continuum damage mechanics aeroengine recuperator 

分 类 号：V23[航空宇航科学与技术—航空宇航推进理论与工程]