Coupled thermoelastic analysis of fretting contacts
Abstract
Fretting fatigue is the contact phenomenon occurring when two bodies in contact experience oscillatory loads. The surface tribology and contact stress evolution in a fretting contact has been studied using coupled thermoelastic analysis. Both, an aluminum and titanium alloy have been studied. Full-field real-time in-situ temperature maps of the contact region and its vicinity have been obtained using a multi-element infrared camera. The distinguishing features of the contact including the sliding regime, partial slip contact, bulk stress effects, boundary conditions effects etc. have been successfully captured using temperature measurement of the order of millikelvin. The coupled thermoclastic response of aluminum and titanium alloy has been successfully characterized, including the mean stress effect. A full coupled thermoelastic finite element model with Coulomb friction, frictional heating and gap conductance, has been used to predict the experimental temperatures. Changes in loads and changes in the coefficient of friction produce changes in different areas of the temperature field. The coupled thermoelastic effect may be used as a powerful tool to guide the march towards the complete understanding of the phenomenon of fretting. The method has been successfully used to guide the finite element analysis of a lap joint specimen.
Degree
Ph.D.
Advisors
Farris, Purdue University.
Subject Area
Mechanics|Aerospace materials|Mechanical engineering
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