应力超声滚压表面强化机理和抗疲劳性能研究
Study on Strengthening Mechanism and Anti-fatigue Performance of Stress Ultrasonic Rolling
吴杰 1党嘉强 2李宇罡 1陈东 1安庆龙 2王浩伟 1陈明2
作者信息
- 1. 上海交通大学金属基复合材料国家重点实验室 上海 200240
- 2. 上海交通大学机械系统与振动国家重点实验室 上海 200240
- 折叠
摘要
从理论分析角度探讨了超声滚压与单轴拉伸弹性应力场耦合的基本原理,并通过有限元模拟和实验表征依次从数值仿真和实验角度对理论分析结果进行验证,从而发展了一种先进的表面机械强化新工艺——应力超声滚压,并将其成功应用于TiB2/2024和TiB2/7050铝基复合材料表面机械强化效果的增强和抗疲劳性能的提升.结果表明,相较于普通超声滚压,应力超声滚压对TiB2/2024和TiB2/7050铝基复合材料表层压缩残余应力峰值的提升可分别达到所施加单轴拉伸弹性应力水平的45％和70％,可将压缩残余应力影响层深度提升约100 μm,从而将两种复合材料样品的疲劳极限在普通超声滚压强化的基础上分别进一步提升6％和5％.
Abstract
The basic principle of coupling ultrasonic rolling with uniaxial tensile elastic stress field is discussed from the perspective of theoretical analysis,and the results of theoretical analysis are verified from the perspective of numerical simulation and experiment through finite element simulation and experimental characterization in turn.Thus,a new advanced surface mechanical strengthening process,stress ultrasonic rolling,is developed and successfully applied to enhance the surface mechanical strengthening effect and fatigue resistance of TiB2/2024 and TiB2/7050 aluminum matrix composites.Compared with ultrasonic rolling,the results showed that,after stress ultrasonic rolling,the peak compressive residual stresses in the surface layers of TiB2/2024 and TiB2/7050 aluminum matrix composites are increased by 45％and 70％of the applied uniaxial tensile elastic stress values,respectively,the depth of the layer affected by compressive residual stresses is increased by about 100 μm,and the fatigue limits of the two composite samples were further increased by 6％and 5％,respectively.
关键词
应力超声滚压/铝基复合材料/有限元模拟/实验表征/疲劳Key words
stress ultrasonic rolling/aluminum matrix composites/finite element simulation/experimental characterization/fatigue引用本文复制引用
基金项目
国家自然科学基金资助项目(U1937208)
出版年
2024
NETL
NSTL
万方数据