Vibratory peening for the fatigue life improvement of aerospace parts

振动喷丸可提高航空航天零件的疲劳寿命

• 批准号: 493525-2015
• 负责人: Lévesque, Martin
• 金额: $ 1.54万
• 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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618528
• 关键词: Vibratory; peening; fatigue; life; improvement

Most metallic aerospace parts are surface treated to improve their fatigue lives. Conventional shot peening consists of projecting hard particles at high velocity onto a ductile metallic surface. The process induces compressive surface residual stresses, which is beneficial for improving fatigue life, but also roughness, which decreases fatigue life. Shot peened parts are often surface treated for improving their surface finish. Vibratory peening is a vibratory finishing process that induces compressive residual stresses comparable to those induced by shot peening, but for a much better surface finish. The process could therefore be an interesting alternative to shot peening since it combines two steps in one. The objective of this work is to understand the vibratory peening treatment effects of a Canadian company, VibraFinish, on materials used in gas turbine engines manufactured by Safran. This scientific study will investigate the effects of vibratory peening on roughness, hardness, residual stresses as well as microstructural changes for high strength steel and titanium alloys so as to assess its potential at improving fatigue life. The work will be carried out by a MSc student supported by a research associate and engineers from the industry. If the process' potential at improving fatigue life is scientifically demonstrated, this project will be the grounds for a more important collaborative research and development project between VibraFinish, Polytechnique Montréal and Safran. This project would aim at better understanding the process' effects in a view of optimizing it. As such, this proposed project could help a Canadian company to establish its leadership in a competitive market as well as providing Canada-based Safran companies with a new process of improved performance.

大多数金属航空航天零件都经过表面处理，以提高其疲劳寿命。传统的喷丸处理是将硬质颗粒高速喷射到延展性金属表面上。该过程会产生压缩表面残余应力，这有利于提高疲劳寿命，但也会产生粗糙度，从而降低疲劳寿命。喷丸零件通常经过表面处理以提高其表面光洁度。振动喷丸是一种振动精加工工艺，其产生的残余压应力与喷丸所产生的残余压应力相当，但表面光洁度要好得多。因此，该工艺可能是喷丸强化的一种有趣的替代方案，因为它将两个步骤合二为一。这项工作的目的是了解加拿大公司 VibraFinish 对赛峰集团制造的燃气涡轮发动机所用材料的振动喷丸处理效果。这项科学研究将调查振动喷丸对高强度钢和钛合金的粗糙度、硬度、残余应力以及微观结构变化的影响，以评估其提高疲劳寿命的潜力。这项工作将由一名理学硕士学生在一名研究员和业内工程师的支持下完成。如果该工艺提高疲劳寿命的潜力得到科学证明，该项目将成为 VibraFinish、蒙特利尔理工学院和赛峰集团之间更重要的合作研发项目的基础。该项目旨在更好地了解流程的效果，以优化流程。因此，该拟议项目可以帮助加拿大公司在竞争激烈的市场中建立领导地位，并为加拿大赛峰集团公司提供提高绩效的新流程。