An investigation of fretting wear in aerospace applications

[摘要] ENGLISH ABSTRACT: Fretting wear results in the loss of fit and tolerance at contact interfaces. The aerospace and aircraft industryis severely impacted by fretting wear and fretting fatigue that frequently occurs in turbo machinery andriveted structural connections. There have been numerous studies, investigating the fretting phenomenon forthese aerospace applications.Literature available in regard to fretting wear encountered in these aerospace applications is limited. Thisstudy is therefore aimed at investigating the fretting wear encountered in aerospace application. An in-housefretting test apparatus was specially designed and developed in order to perform the fretting wearexperiments. Ti-6Al-4V and Al7075-T6 are the two aerospace materials that were tested using the frettingtest apparatus. An extensive experimental study was conducted in order to investigate the effect of thenormal force on the fretting wear and friction behaviour of the two aerospace materials. The most severe ofthese experiments were identified and then repeated for up to 106 fretting cycles. Additional fretting wearexperiments were also conducted between the two aerospace materials and cemented carbides, since thecarbides are currently being utilized as coatings in some aerospace contacts that are prone to fretting induceddamage.The experimental study revealed that a decrease in the normal force resulted in an increase in the severity ofthe fretting wear of both aerospace materials. The additional fretting wear experiments involvingcarbide-metal contact couples found that Ti-6Al-4V and Al7075-T6 were prone to adhesive wear.

[发布机构] Stellenbosch University