Shot peening for fatigue life improvement of aerospace strutures

喷丸强化提高航空航天结构的疲劳寿命

• 批准号: 435539-2012
• 负责人: Lévesque, Martin
• 金额: $ 10.35万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=574099
• 关键词: Shot; peening; fatigue; life; improvement

Shot peening is a cold working process widely used to improve the fatigue life of metal components in the aerospace industry. This process is accomplished by bombarding the surface of a metallic component with shots at a high velocity that induce a plastic deformation layer near the surface. This plastic deformation leads to a residual compressive stress field in the peened surface that reduces the likelihood of premature failure under cyclic loading conditions and therefore improves the fatigue life of the peened component. The principle objective of this collaborative project is to develop in collaboration with the industrial partners novel methodologies for characterizing the shot peening process. One part of the program is devoted to establish analytical and numerical models for the prediction of the shot peening process. Experimental campaigns are planned in order to qualify the effect of the shot peening parameters on the peening results as well as to validate the developed models. The other part of the program is to assess the fatigue life improvement on the peened components. The crack initiation and propagation during cyclic loading in the peened component will be experimentally observed and numerically simulated in the microstructural scale.

喷丸强化是航空航天工业中广泛用于提高金属部件疲劳寿命的一种冷加工工艺。这一过程是通过用高速子弹轰击金属部件的表面来完成的，这在表面附近引起了塑性变形层。这种塑性变形导致喷丸表面存在残余压应力场，减少了循环加载条件下过早失效的可能性，从而提高了喷丸部件的疲劳寿命。