Performance Assessment of a new Ceramic Medium for Use in an Improved Aircraft Structures Shot-Peening Process: Evaluation of Fatigue Life Enhancement****

Curtiss-Wright表面技术公司是喷丸硬化的行业领导者，喷丸硬化是一种冷加工工艺，在这种工艺中，称为喷丸的小球形介质轰击零件表面。传统上，航空工业已经根据航空航天材料规范（AMS）2430使用AMS 2431/1或2431/2对部件进行喷丸处理。喷丸处理的目的是通过在零件表面施加压应力来提高疲劳寿命和抗应力腐蚀性。虽然有许多不同的介质来执行这个过程（即在零件上喷射小物体以使表面塑性变形），但该行业通常使用AMS 2431/1或AMS 2431/2铸钢丸。这些喷射介质具有有限的寿命，污染部件表面，在它们腐烂并需要处置时产生健康和安全问题。最近，喷丸介质行业开发了一种声称符合上述标准的新陶瓷喷丸。然而，这一枪已经进入市场，还没有经过技术验证（TRL 4-6），以获得工业上的认可，也没有适航资格。本提案旨在通过进行旨在评估新陶瓷介质性能的表征研究，特别是就疲劳寿命的改善而言，部分解决这一问题。柯蒂斯赖特金属改进公司（CW MIC），柯蒂斯赖特表面技术的一个部门，有一个主要的喷丸设施在布兰普顿安大略。布兰普顿工厂对拟议的喷丸硬化介质的工业鉴定特别感兴趣，因此对该拟议合作感兴趣。该示范项目的成功完成将为Curtiss Wright MIC带来好处，为新型陶瓷喷射介质的主要认证工作铺平道路，旨在提高组件性能，改善喷射介质的生命周期成本，消除去污，减少员工的粉尘暴露，并为喷射介质提供摇篮到摇篮的环境解决方案。

Curtiss-Wright Surface Technologies is an industry leader in shot peening, a cold working process in which small spherical media called shot bombard the surface of a part. Traditionally the aircraft industry has used shot peening in accordance with Aerospace Material Specification (AMS) 2430 using AMS 2431/1 or 2431/2 to shot peen components. The purpose for shot peening is to improve fatigue life and stress corrosion resistance by imparting compressive stresses on the part surface. Although many different media exist to perform this process (i.e. blast small objects at parts to plastically deform the surface), the industry has classically used AMS 2431/1 or AMS 2431/2 cast steel shots. These shot media have finite life, pollute the component surface, create health and safety issues as they decay and require disposal. Recently the shot media industry has developed a new ceramic shot that alleges to meet the criteria above. The shot is in the marketplace, however, has yet to be technology demonstrated (TRL 4-6) to be industrially accepted nor qualified for airworthiness. This proposal seeks to partially address this issue by conducting a characterization study aiming at assessing the performance of the new ceramic medium, in particular in as far as improvement in fatigue life is concerned.**Curtiss Wright Metal Improvement Company (CW MIC), a division of Curtiss-Wright Surface Technologies, has a major shot peening facility in Brampton Ontario. The industrial qualification of the proposed shot peening medium is of particular interest to the Brampton facility, hence the interest in this proposed collaboration. The successful completion of this demonstration program would provide benefits to Curtiss Wright MIC by paving the road for a major qualification effort of the new ceramic shot medium, aiming to improve component performance, improve the life cycle cost of shot media, eliminate decontamination, reduce dust exposure to employees and provide a cradle to cradle environmental solution to shot media.****