TC4钛合金激光冲击抗外物打伤高周疲劳性能研究
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- 英文论文题名：High cycle fatigue performance in laser shock peened TC4 titanium alloys due to foreign object damage
- 论文作者：罗思海 ; 何卫锋 ; 李应红 ; 聂祥樊
- 英文论文作者：Luo Sihai ; He Weifeng ; Li Yinghong ; Nie Xiangfan ; Science and Technology on Plasma Dynamics Laboratory ; Air Force Engineering University
- 年：2016
- 作者机构：空军工程大学等离子体动力学重点实验室;
- 论文关键词：激光冲击强化 ; 外物打伤 ; TC4钛合金 ; 疲劳强度 ; 应力分析
- 英文论文关键词：Laser shock peening ; foreign object damage ; TC4 titanium alloy ; fatigue strength ; numerical stress analysis
- 会议召开时间：2016-11-25
- 会议录名称：2016年航空科学与技术全国博士生学术论坛摘要集
- 语种：中文
- 分类号：V252.2;V231.95
- 学会代码：XBHH
- 会议名称：2016年航空科学与技术全国博士生学术论坛
- 会议地点：中国陕西西安
- 主办单位：西北工业大学研究生院、中国高校航空学院院长联席会
- 学会名称：西北工业大学航空学院
- 页数：1
- 文件大小：564k
- 原文格式：D
- 会议级别：全国
摘要
外物损伤(Foreign object damage,FOD)是指航空发动机在起飞、降落过程中不可避免吸入外来硬物(如砂砾、石块、金属块等)进入进气道,进而打伤风扇/压气机叶片,在高频疲劳载荷作用下,快速形成裂纹并扩展至断裂,甚至引起二次损伤,打坏发动机流道后续叶片等结构,引起非包容性事故,严重影响飞行安全和可靠性。激光冲击强化是一种利用纳秒脉冲激光辐照金属材料表面,通过产生高压等离子体冲击波诱导材料表面发生超高应变率塑性变形,产生残余压应力和微观组织变化,从而提高航空发动机部件疲劳强度和损伤容限的表面强化技术。采用激光冲击强化技术对TC4钛合金平板试件进行表面处理,然后利用空气炮系统对TC4钛合金强化区边缘模拟叶片边缘300m/s、90°外来物冲击。最后,对原始试件、外物打伤试件以及强化后打伤试件进行高周疲劳性能考核。结果表明,激光冲击强化可有效提高损伤试件疲劳强度和损伤容限。结合应力场分布数值仿真,分析了激光冲击强化抗外物打伤的影响机理。
Foreign object damage(FOD) can seriously shorten the fatigue lives of components and has been identified as one of the main life limiting factors for fan/ compressor blades in aeroengine. Laser shock peening(LSP) has been proved to can improve the damage tolerance of military engine components through inducing deep high magnitude compressive residual stress in the surface layer of treated region. In this paper, the TC4 titanium alloy smooth specimens were used and treated by LSP in the center region prior to FOD impact. FOD was simulated by firing a sphere projectile at the leading edge of peened region using a light gas gun at a nominal velocity of 300 m/s for 90° impact and subjecting the impacted specimens to fatigue loading. The fatigue results shows that LSP can effectively improve the fatigue strength of the damage specimens. Further, numerical stress analysis was adopted to analyze the effect of LSP on the fatigue strength and damage tolerance.
Foreign object damage(FOD) can seriously shorten the fatigue lives of components and has been identified as one of the main life limiting factors for fan/ compressor blades in aeroengine. Laser shock peening(LSP) has been proved to can improve the damage tolerance of military engine components through inducing deep high magnitude compressive residual stress in the surface layer of treated region. In this paper, the TC4 titanium alloy smooth specimens were used and treated by LSP in the center region prior to FOD impact. FOD was simulated by firing a sphere projectile at the leading edge of peened region using a light gas gun at a nominal velocity of 300 m/s for 90° impact and subjecting the impacted specimens to fatigue loading. The fatigue results shows that LSP can effectively improve the fatigue strength of the damage specimens. Further, numerical stress analysis was adopted to analyze the effect of LSP on the fatigue strength and damage tolerance.
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