Energy-based variational modeling of adiabatic shear bands structure evolution

Propagation of Adiabatic Shear Bands

The genesis of adiabatic shear bands

Adiabatic shear banding (ASB) is a unique dynamic failure mechanism that results in an unpredicted catastrophic failure due to a concentrated shear deformation mode. It is universally considered as a material or structural instability and as such, ASB is hardly controllable or predictable to some extent. ASB is modeled on the premise of stability analyses. The leading paradigm is that a competi...

Adiabatic Shear Bands in Functionally Graded Materials

The initiation and propagation of adiabatic shear bands (ASBs) in functionally graded materials (FGMs) deformed at high strain rates in plane-strain tension have been studied. An ASB is a narrow region, usually a few micrometers wide, of intense plastic deformation that forms after softening of the material due to its being heated up and the evolution of damage in the form of porosity has overc...

Analysis of Adiabatic Shear Bands by Numerical Methods

ρ mass density in the present configuration ρ0 mass density in the reference configuration J determinant of the deformation gradient Fiα components of deformation gradient xi coordinates of a point in the present configuration Xα coordinates of a point in the reference configuration Tiα components of the first Piola Kirchhoff stress tensor vi components of velocity bi components of body force p...

Adiabatic shear failure and dynamic stored energy of cold work.

Dynamic testing of statically predeformed specimens of magnesium (AM50) shows that the failure strain increases with the level of prestrain. Interrupted and other dynamic tests show that the temperature rise prior to localization has only a minor influence on adiabatic shear band (ASB) formation. For all the tests, the dynamic deformation energy until ASB formation is found to be relatively con...