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Analyse de la propagation dynamique d'une bande de cisaillement adiabatique

Abstract : The dynamic propagation of diabatic shear bands is presently analyzed. A configuration representing the experiments of Marchand and Duffy (1988) is considered in the numerical simulations. A layer of finite length and finite width is subjected to shear loading. After a transient, a steady state is attained in which adiabatic shear bands propagate with a constant velocity. The evolution of the shear band speed is firstly determined as a function of the applied velocity. A comparison between the configuration including heat conduction and the adiabatic case is made in order to stress the influence of heat conductivity on the propagation process. A diamensional analysis allows to determine a general law describing the influence of each problem's parameter on the shear band speed. Finally, the concept of a process zone is introduced. The process zone is a region propagating with the shear band tip, where an intense stress softening by thermo-mechanical coupling. It is shown how the shear band propagation is controlled by this stress softening
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  • HAL Id : tel-01748962, version 1



Anne-Sophie Bonnet-Lebouvier. Analyse de la propagation dynamique d'une bande de cisaillement adiabatique. Autre. Université Paul Verlaine - Metz, 2001. Français. ⟨NNT : 2001METZ017S⟩. ⟨tel-01748962⟩



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