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.

喷丸处理是指用高速喷丸冲击金属部件。冲击使表面塑性拉伸，并引起一层压缩残余应力和冷加工。在适当的条件下，该工艺生产的部件可以承受比未经处理的部件多20倍的疲劳循环。飞机上几乎每一个金属部件都经过喷丸处理。高温喷丸（HTSP）包括在高温下进行常规喷丸。作者已经证明，HTSP可以提供比喷丸更进一步的疲劳寿命改善。振动喷丸（VP）是一种改进的精加工工艺，具有与喷丸相似的优点，但表面光洁度更好。这两种方法在工业上的适用性还有待证明。 这项研究将彻底调查HTSP和VP对航空航天材料疲劳寿命的影响，即：钢，钛和铝。该研究将涉及制造研究HTSP和VP设置，并彻底调查其在表面特性，残余应力，硬度，微观结构变化和疲劳寿命方面的影响。这项工作将由10名工程学B，1名硕士和4名博士生在4年内进行。这项工作将与蒙特利尔理工学院、航天技术中心和赛峰公司合作进行。(in加拿大和法国）。该项目有可能为加拿大航空航天工业带来重大创新。首先，HTSP有可能比喷丸处理产生更好的疲劳寿命改善，这将产生更轻，更耐用的加拿大飞机。VP还具有比喷丸更好地提高疲劳寿命的潜力，并且还将联合收割机两种制造工艺结合为一种：喷丸和表面精加工。因此，这些工艺有可能通过生产更轻、更耐用的部件以及更便宜、更快的制造后工艺来提高我国航空航天工业的竞争力。此外，更轻和更耐用的部件减少了航空旅行的环境印记，这对环境有利。