Thermal-structural response and low-cycle fatigue damage of channel wall nozzle

作     者：Cheng Cheng Wang Yibai Liu Yu Liu Dawei Lu Xingyu 

作者机构：School of Astronautics Beihang University 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2013年第26卷第6期

页      面：1449-1458页

核心收录：

学科分类：080703[工学-动力机械及工程] 082502[工学-航空宇航推进理论与工程] 08[工学] 0807[工学-动力工程及工程热物理] 0825[工学-航空宇航科学与技术] 

主　　题：Channel wall nozzle Damage Life Low cycle fatigue Reusable engine Thermal structural response 

摘      要：To investigate the thermo-mechanical response of channel wall nozzle under cyclic working loads,the fnite volume fluid-thermal coupling calculation method and the fnite element thermal-structural coupling analysis technique are *** combination with the material lowcycle fatigue behavior,the modifed continuous damage model on the basics of local strain approach is adopted to analyze the fatigue damage distribution and accumulation with increasing nozzle work *** results have shown that the variation of the non-uniform temperature distribution of channel wall nozzle during cyclic work plays a signifcant role in the thermal-structural response by altering the material properties;the thermal-mechanical loads interaction results in serious deformation mainly in the front region of slotted *** particular,the maximal cyclic strains appear in the intersecting regions of liner gas side wall and symmetric planes of channel and rib,where the fatigue failure takes place initially;with the increase in nozzle work cycles,the residual plastic strain accumulates linearly,and the strain amplitude and increment in each work cycle are separately equal,but the fatigue damage grows up *** a result,a simplifed nonlinear damage accumulation approach has been suggested to estimate the fatigue service life of channel wall *** predicted node life is obviously conservative to the Miner＇s *** addition,several workable methods have also been proposed to improve the channel wall nozzle durability.