航空学报2025，Vol.46Issue(17)：336-346,11.DOI:10.7527/S1000-6893.2025.31717
基于裂纹萌生与扩展的选区激光熔化Al-Mg-Sc-Zr合金疲劳寿命分析
Fatigue life analysis of selective laser melting Al-Mg-Sc-Zr alloy based on crack initiation and propagation
摘要
Abstract
Additive Manufacturing(AM)has significant application value in the aerospace field due to its characteris-tics of free-forming and rapid production.However,the fatigue dispersion of materials produced by AM shows consid-erable variability,making accuratel fatigue life assessment a key challenge in aerospace applications.Selective Laser Melting(SLM)Al-Mg-Sc-Zr alloy exhibits high strength and low density.This paper establishes a fatigue life analysis method based on the mechanisms of crack initiation and propagation for this material.First,a rapid Stress Intensity Factor(SIF)analysis model was developed for cracks with varying sizes and locations based on finite element analy-sis.Subsequently,the crack propagation life was evaluated using the NASGRO model,and a defect-based crack ini-tiation life model was established.Ultimately,a two-stage fatigue life analysis encompassing both crack initiation and propagation was developed.The analysis results were compared with fatigue test data from Transverse Build Direction(TD)and Parallel Build Direction(PD)samples.The results indicate that the fatigue life text results generally fall within the twofold error band,validating the effectiveness of the proposed method.Crack initiation is primarily influ-enced by the defect geometric characteristics,while crack propagation is mainly governed by the microstructure.This method provides a scientific basis and means for fatigue life assessment of AM materials.关键词
激光选区熔化/Al-Mg-Zr-Sc/裂纹萌生与扩展/缺陷几何特征/寿命分析Key words
selective laser melting/Al-Mg-Sc-Zr/crack initiation and propagation/defect geometric characteristics/life analysis分类
航空航天引用本文复制引用
邹君,陈翥仪,夏晓宇,冯振宇..基于裂纹萌生与扩展的选区激光熔化Al-Mg-Sc-Zr合金疲劳寿命分析[J].航空学报,2025,46(17):336-346,11.基金项目
航空科学基金(2024Z057067003) （2024Z057067003）
机械结构力学及控制国家重点实验室开放课题(MCMS-E-0522Y03) （MCMS-E-0522Y03）
中央高校基本科研业务费专项资金(3122025084) Aeronautical Science Foundation of China(2024Z057067003) （3122025084）
Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures(MCMS-E-0522Y03) （MCMS-E-0522Y03）
Fundamental Research Funds for the Central Universities(3122025084) （3122025084）
