Advanced peening processes for the fatigue life improvement of aerospace components

先进的喷丸工艺可提高航空航天部件的疲劳寿命

• 批准号: 518968-2017
• 负责人: Lévesque, Martin
• 金额: $ 11.37万
• 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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=693883
• 关键词: Advanced; peening; processes; fatigue; life

Shot peening consists in impacting a metal part with high velocity shots. The impacts plastically stretch the surface and induce a layer of compressive residual stresses and cold working. Under the right conditions, the process delivers components that can withstand 20 times more fatigue cycles than untreated parts. Nearly every metallic part of an aircraft is shot peened. High Temperature Shot Peening (HTSP) consists in carrying out conventional shot peening at elevated temperature. Authors have demonstrated that HTSP can deliver even further fatigue life improvement than shot peening. Vibratory Peening (VP) is a modified finishing process that induces similar benefits as shot peening but for a much better surface finish. The applicability of these two processes within an industrial context have yet to be demonstrated. This research will thoroughly investigate the effects of HTSP and VP on the fatigue lives of aerospace materials, namely: steel, titanium and aluminum. The research will involve manufacturing research HTSP and VP setups and thoroughly investigate their effects in terms of surface characteristics, residual stresses, hardness, microstructural changes and fatigue life. The work will be carried out by 10 B.Eng, 1 MSc and 4 PhD students over 4 years. The work will be carried out in collaboration with Polytechnique Montréal, Centre Technologique en Aérospatiale and Safran S.A. (in Canada and in France). This project has the potential to trigger significant innovation for the Canadian aerospace industry. First, HTSP has the potential to yield better fatigue life improvement than shot peening, which will yield to lighter and more durable Canadian aircraft. VP has the potential to also yield better fatigue life improvement than shot peening and also to combine two manufacturing processes into one: peening and surface finishing. These processes have therefore the potential to increase the competitiveness of our aerospace industry by producing lighter and more durable parts, as well as yielding cheaper and faster post-manufacturing processes. Moreover, lighter and more durable parts reduce the environmental imprint of air travel, which is beneficial for the environment.

喷丸处理是用高速喷丸冲击金属零件，冲击使表面产生塑性拉伸，并产生一层压缩残余应力和冷加工，在适当的条件下，该工艺生产的部件能够承受比未经处理多 20 倍的疲劳循环。飞机的几乎每个金属部件都经过喷丸处理（HTSP），作者已经证明，与喷丸相比，HTSP 可以进一步提高疲劳寿命。振动喷丸（VP）是一种改进的表面处理工艺，具有与喷丸处理类似的优点，但其表面光洁度要好得多。本研究将彻底研究其效果。 HTSP 和 VP 对航空航天材料（即钢、钛和铝）疲劳寿命的影响 该研究将涉及 HTSP 和 VP 设置的制造研究，并彻底研究它们在表面特性、残余应力、硬度、这项工作将由 10 名工程学士、1 名硕士和 4 名博士生在 4 年内与蒙特利尔理工学院、航空航天中心和 Safran S.A. 合作进行。该项目有可能引发加拿大航空航天业的重大创新，首先，HTSP 比喷丸有可能产生更好的疲劳寿命。这将生产出更轻、更耐用的加拿大飞机，与喷丸相比，它还可以提高疲劳寿命，并且还可以将喷丸和表面精加工两种制造工艺合二为一，因此这些工艺有可能提高竞争力。通过生产更轻、更耐用的零件以及更便宜、更快速的后制造流程，我们的航空航天工业得到了发展。此外，更轻、更耐用的零件减少了航空旅行的环境影响，这对环境有利。