Research article Stability of thermoelastic


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Research article


Stability of thermoelastic sliding problem with contact pressure-dependent thermal contact resistance

The sliding contact problem of a rigid indenter over an elastic body with constant temperature difference was investigated using finite element method by considering a contact pressure-dependent thermal resistance. The stability boundary was identified by inspecting the transient contact behaviors, which showed a linear relationship between two nondimensional parameters at the log scale. This proportionality resulted in a nondimensional ratio, which depended on temperature, contact resistance, and sliding speed in the case of unit nondimensional material properties, suggesting “critical temperature difference”. Moreover, the inclusion of Poisson ratio prevented the indefinite bifurcation behavior and led to a finite length scale in the steady state.

https://www.sciencedirect.com/science/article/abs/pii/S0020768322003286


Harorat farqi doimiy bo'lgan elastik jism ustidagi qattiq denterning sirpanish aloqa muammosi kontakt bosimiga bog'liq issiqlik qarshiligini hisobga olgan holda chekli elementlar usuli yordamida tekshirildi. Barqarorlik chegarasi vaqtinchalik aloqa xatti-harakatlarini tekshirish orqali aniqlandi, bu log shkalasida ikkita o'lchovsiz parametrlar o'rtasidagi chiziqli munosabatni ko'rsatdi. Ushbu mutanosiblik o'lchovsiz nisbatga olib keldi, bu harorat, kontakt qarshiligi va birlik o'lchovsiz material xususiyatlarida sirpanish tezligiga bog'liq bo'lib, "tanqidiy harorat farqi" ni ko'rsatadi. Bundan tashqari, Puasson nisbatining kiritilishi noaniq bifurkatsiya harakatining oldini oldi va barqaror holatda cheklangan uzunlik shkalasiga olib keldi.
What Are Sliding Contacts?
Electrical contacts in switches come in a variety of configurations depending on such factors as the use and power capacity.
All Alps Alpine detector switches employ sliding (wiping) contacts.
Sliding contacts are structured so contact occurs as the moving contact slides against a fixed contact. As the contact occurs, any tiny particles of foreign matter or film that come between the contacts are removed (self-cleaning), ensuring high contact reliability in use with very small currents.
Sliding contacts with a moving contact that clamps the fixed contact from both sides are called double-sided sliding contacts and are even more reliable.
Besides sliding contacts, there are also contact structures where the contacts collide with each other, like butt contacts, but these are primarily used, for example, in power switches with medium to high currents when electricity would break through surface film.
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