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Article Dans Une Revue Experimental Mechanics Année : 2012

Relationship between local strain jumps and temperature bursts due to the Portevin-Le Chatelier effect in an Al-Mg alloy

Résumé

Local strain and temperature of an AA5754-O aluminum alloy sheet have been full-field measured during monotonous tensile tests carried out at room temperature. Sharp strain increases and temperature bursts which are locally generated by the Portevin-Le Chatelier phenomenon have been measured at the same point for two strain rates: V2 = 1.9x10-3 s-1 and V10 = 9.7x10-3 s-1. A relationship, which is based on the underlying physical mechanisms, has been established between the strain and the temperature and experimentally verified for the highest strain rate V10. The discrepancy between the theoretical and experimental results for the lowest strain rate V2 suggests that the localized plastic deformations do not follow an adiabatic transformation. Such a set-up seems to offer a direct and experimental method to check the adiabatic character of localized plastic deformations.

Dates et versions

hal-00768646 , version 1 (22-12-2012)

Identifiants

Citer

Cédric Bernard, J. Coër, H. Laurent, P. Chauvelon, P.Y. Manach. Relationship between local strain jumps and temperature bursts due to the Portevin-Le Chatelier effect in an Al-Mg alloy. Experimental Mechanics, 2012, ⟨10.1007/s11340-012-9711-4⟩. ⟨hal-00768646⟩
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