摘要
为了研究不同应力比下激光喷丸强化(LSP)对6061-T6铝合金疲劳裂纹扩展性能的影响,采用有限元软件ABAQUS和疲劳分析软件MSC.Fatigue相结合,对应力比为0.1、0.3、0.5条件下的6061-T6铝合金紧凑拉伸(CT)试样进行了激光喷丸强化疲劳裂纹扩展的数值模拟,分析残余压应力对高低应力比下的裂纹闭合效应,探索不同应力比对激光喷丸强化疲劳寿命增益的影响。结果表明,经过激光喷丸后,3种不同应力比下的疲劳裂纹扩展速率较未处理试件都有一定的降低;应力比的取值对激光喷丸后CT试样的疲劳寿命有显著影响,应力比越小,激光喷丸对CT试样疲劳寿命的增益影响越明显。
In order to investigate the effect of laser shot peening （LSP） on fatigue crack propagation of 6061-T6 aluminum alloy under different stress ratios, finite element software ABAQUS and fatigue analysis software MSC. Fatigue are used to establish the prediction model to analyze the effects of different stress ratios （R = 0.1, 0.3, 0.5） on crack propagation induced by LSP. The effects of residual compressive stress on the crack closure under different stress ratios are studied and the increase of fatigue life is predicted. The results show that fatigue crack growth rate decreases after LSP, compared with the untreated sample under three stress ratios. The value of stress ratio significantly affects the fatigue life of compact tension （CT） specimen after laser shot peening, however, the lower value of stress ratio is, the more the increase in fatigue life attained by LSP is.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2011年第9期73-78,共6页
Chinese Journal of Lasers
基金
国家自然科学基金(50675090)
江苏省自然科学基金(BK2010351)
江苏省高校自然科学基金(10KJB460002)
江苏大学研究生创新基金(CX09B_07XZ)
镇江市工业科技支撑项目(SGY20090026)
江苏省2008青蓝工程资助项目
2010江苏高校优势学科建设工程资助课题
关键词
激光技术
激光喷丸强化
裂纹扩展
残余应力
应力比
数值模拟
laser technique
laser shot peening
crack growth
residual stress
stress ratio
numerical simulation
