喷丸残余应力及夹杂影响小裂纹仿真概率模型  

Probabilistic model of small crack simulation considering shot peening residual stress and inclusion influence

作　　者：杨茂[1] 陆山[1] 潘容 张永刚 刘小桃 秦仕勇 YANG Mao;LU Shan;PAN Rong;ZHANG Yonggang;LIU Xiaotao;QIN Shiyong(School of Power and Energy,Northwestern Polytechnical University,Xi’an 710129,China;Sichuan Gas Turbine Establishment,Aero Engine Corporation of China,Chendu 610500,China;Xi’an Xae Flying Aviation Manufacturing Technology Company Limited,Xi’an Aero-Engine(Group)Limited,Xi’an 710018,China)

机构地区：[1]西北工业大学动力与能源学院,西安710129 [2]中国航发四川燃气涡轮研究院,成都610500 [3]西安航空发动机(集团)有限公司莱特航空制造技术有限公司,西安710018

出　　处：《航空动力学报》2023年第4期913-920,共8页Journal of Aerospace Power

摘　　要：提出考虑喷丸残余应力及内部夹杂影响的随机内部小裂纹形核扩展概率模型,实现构件内部疲劳裂纹萌生过程的仿真。针对高温合金X,在开展试验的数据基础上,识别模型所需的残余应力分布参数、“形核相关”夹杂尺寸分布参数、微观结构相关塑性本构参数及小裂纹形核扩展参数。模型成功预测喷丸等直棒两种主要的形核方式:残余拉应力平衡层夹杂形核及无残余应力区夹杂形核。与试验对比,模型预测内部裂纹萌生寿命及其分散精度高,残余拉应力平衡层预测萌生寿命中值误差为2%,-3σ寿命误差为37%,无残余应力区预测萌生寿命中值误差为3%,-3σ寿命误差为3%;此外,模型仿真的内部裂纹形貌为“鱼眼形”,贴合试验件断口形貌。A probabilistic model to simulate nucleation and propagation of internal small crack induced by shot peening residual stress and internal inclusion was proposed to realize the simulation of internal fatigue crack initiation process.For superalloy X,parameters of the residual stress distribution,the‘nucleation-related' inclusion size distribution,the microstructure-related plastic constitutive model and the small crack nucleation and propagation required by the model were identified based on the experimental data.Two main nucleation patterns of shot peening uniform-cross-section bar specimens were successfully predicted by the proposed model:the inclusion nucleation in residual tensile equilibrium zone and the inclusion nucleation in the zone without residual stress.Compared with the experiment,the proposed model had high accuracy in predicting the internal crack initiation life and its dispersion.The error of predicted median initiation life in residual tensile stress equilibrium zone was 2%,and the error of predicted initiation life was 37%.The error of predicted median initiation life in the zone without residual stress was 3%,and the error of predicted-3σ initiation life was 3%.In addition,the internal crack morphology simulated by the present model was of ‘fisheye' shape,which was consistent with the fracture appearance of the specimen.

关 键 词：喷丸 残余应力 夹杂 小裂纹形核扩展 萌生寿命 

分 类 号：V231.95[航空宇航科学与技术—航空宇航推进理论与工程]