Adiabatic shear failure in brittle solids

作者：Grady Dennis E^*

来源：International Journal of Impact Engineering, 2011, 38(7): 661-667.

DOI：10.1016/j.ijimpeng.2011.01.001

• Shear localization
• Adiabatic shear
• Brittle solids
• Boron carbide

Recent studies have revealed microscopic amorphous lamella resulting from inelastic deformation in the ballistic impact of boron carbide ceramic. The possibility that these deformation features are a consequence of adiabatic shear deformation in the impact event is explored. An early theory of adiabatic shear that was limited to the response of rigid-plastic deformation is expanded to include elastic strain energy. The study reveals that elastic strain energy is commonly a small, but not negligible, contribution to impact-induced adiabatic shear in metals. Elastic strain energy is paramount in brittle solids. Relations are developed from the theory to predict the nominal width and spacing of adiabatic shear-bands in brittle solids. Comparisons of the theoretical predictions are consistent with observations of impact-induced deformation features in boron carbide.

• 出版日期2011-7