Influence of preloading on formation of adiabatic localized shear in copper

Abstract

Abstract. This paper is devoted to results of investigation of localized shear in as-received copper, and which was subjected to preliminary quasi-isentropic shock loading by the pressure of ∼ 30 GPa. Tests were performed with hat-shaped samples by the Split Hopkinson Pressure Bar method (SHPB). The authors present estimation of quantitative characteristics of localized shear in tested materials (shear stress, relative shear strain, shear band width, relative strain rate in shear band). The paper includes data of metallographic investigations of the tested samples. Also the authors made an attempt of numerical simulation of stress field change during formation.

Compact forced simple-shear sample for studying shear localization in materials

“…One such forced shear sample, termed the "top-hat" specimen was originated by Hartman, Kunze, and Meyer [41] and Meyer and Manwaring [12] and thereafter further developed by several investigators [23,25,56]. This sample design has seen wide application due to its compact geometry making it readily amenable to testing on quasi-static, intermediate strain-rate testing platforms, and using split-Hopkinson/Kolsky Pressure Bars [57,58]. In addition, the 'top-hat' sample design has been modeled using finite-element methods, where the modeling results have been shown to positively compare with experimental results [58,59].…”

“…This sample design has seen wide application due to its compact geometry making it readily amenable to testing on quasi-static, intermediate strain-rate testing platforms, and using split-Hopkinson/Kolsky Pressure Bars [57,58]. In addition, the 'top-hat' sample design has been modeled using finite-element methods, where the modeling results have been shown to positively compare with experimental results [58,59].…”

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

“…Shear stress-shear displacement curves of various microstructures at (A) RT and (B) CT. Shear stress-nominal shear strain curves of various microstructures for the experiments conducted at (C) RT and (D) CT. (E) Uniform dynamic shear strain vs. dynamic shear YS for the present MEA, along with data for other metals and alloys. (F) Impact shear toughness vs. dynamic shear YS for the present MEA, along with data for other metals and alloys[64,[150][151][152][153][154][155][156][157][158] . MEA: Medium-entropy alloy; RT: room temperature; YS: yield stress; CT: cryogenic temperatures.…”