旋片喷丸强化对2024铝合金预拉伸板疲劳性能的影响
Effect of Flap Peen Hardening on Fatigue Properties of 2024 Aluminum Alloy Prestretching Sheet
摘 要
采用成组对比法分析了中心开长圆孔的2024铝合金预拉伸板在旋片喷丸强化前后的疲劳性能，通过三维数码显微镜和X射线应力测试仪对其断口形貌和喷丸强化前后孔壁表面的残余应力进行了分析。结果表明：经旋片喷丸强化后，2024铝合金预拉伸板在180 MPa与168 MPa应力下的疲劳中值寿命分别提高了1.727~2.728倍与1.606~2.110倍；经旋片喷丸强化后，2024铝合金表面形成了大约300 MPa的残余压应力，疲劳裂纹源的萌生区域减小且位于铝合金的内部，提高了铝合金的疲劳性能。
2024铝合金
预拉伸板
疲劳性能
残余应力
flap peen
2024 aluminum alloy
prestretching sheet
fatigue property
residual stress
Abstract
The fatigue properties of 2024 aluminum alloy prestretching sheet with an obround hole in the center before and after flap peen hardening were analyzed by group comparison method. The fatigue fracture and the residual stress of the surface of the hole wall before and after flap peen hardening were analyzed by three-dimensional digital microscope and X-ray stress tester. The results show that the median fatigue life of the 2024 aluminum alloy prestretching sheet increased by 1.727-2.728 times and 1.606-2.110 times, respectively, when loading stress were 180 MPa and 168 MPa. Flap peen hardening introduced 300 MPa residual compressive stress on the surface of aluminum alloy 2024, and the initiation region of the fatigue crack source reduced and located inside the aluminum alloy, and thus the fatigue properties of the aluminum alloy were improved.
中图分类号 TH16 V262.3 DOI 10.11973/jxgccl201712004
所属栏目 试验研究
基金项目
收稿日期 2016/11/3
修改稿日期 2017/10/12
网络出版日期
作者单位点击查看
备注王晓阳(1991-),男,陕西宝鸡人,助理工程师,硕士
引用该论文: WANG Xiaoyang,LING Xiaotao,XU Gang. Effect of Flap Peen Hardening on Fatigue Properties of 2024 Aluminum Alloy Prestretching Sheet[J]. Materials for mechancial engineering, 2017, 41(12): 18～21
王晓阳,凌晓涛,徐刚. 旋片喷丸强化对2024铝合金预拉伸板疲劳性能的影响[J]. 机械工程材料, 2017, 41(12): 18～21
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参考文献
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【3】张杰,白雪飘,陆业航,等. 不同强度喷丸处理后铝锂合金表面的残余应力[J]. 机械工程材料,2016,40(2):37-39.
【4】李鹏,刘道新,关艳英,等. 喷丸强化对新型7055-T7751铝合金疲劳性能的影响[J]. 机械工程材料,2015,39(1):86-89.
【5】HONG T, OOI J Y, SHAW B. A numerical simulation to relate the shot peening parameters to the induced residual stress[J]. Engineering Failure Analysis, 2008, 15(8):1097-1110.
【6】徐岩松,苟文选,田笑,等. 喷丸强化对2024铝合金疲劳性能的影响分析[J].机械设计与制造,2014(1):104-106.
【7】TAEHYUNG K, JIN H L, HYUNGIL L, et al. An area-average approach to peening residual stress under multi-impacts using a three-dimensional symmetry-cell finite element model with plastic shots[J]. Materials and Design, 2010, 31(1):50-59.
【8】吴运新,廖凯. 铝合金厚板拉伸过程横向残余应力消减分析[J].材料工程,2009(10):45-48.
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