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Title: High temperature and deformation field measurements at the vicinity of dynamically growing shear bands

Abstract

The phenomenon of dynamic initiation and propagation of adiabatic shear bands is experimentally and numerically investigated. Pre-notched metal plates are subjected to asymmetric impact load histories (dynamic mode-II loading). Dynamic shear bands emanate from the notch tip and propagate rapidly in a direction nearly parallel to the direction of the impact. Real time temperature histories along a line intersecting and perpendicular to the shear band paths are recorded by means of a high-speed infrared detector system. The materials studied are C-300 (a maraging steel) and Ti - 6 Al - 4 V alloy. Experiments show that the peak temperatures inside the propagating shear bands are approaching 90% of the melting point for C-300 and are significantly lower for the titanium alloy (up to 600{degrees}C). Additionally, measured distances of shear band propagation indicate stronger resistance to shear banding by the Ti - 6Al - 4V alloy. Deformation fields around the propagating shear bands are recorded using high-speed photography. Shear band speeds are found to strongly depend on impact velocities, and are as high as 1200 m/s for C-300 steels. Finite Element simulations of the experiments are carried out under the context of plane strain, considering finite deformations, inertia, heat conduction, thermalmore » softening, strain hardening and strain-rate hardening. In the simulations, the shear band propagation is assumed to be governed by a critical plastic strain criterion. The results are compared with experimental measurements obtained using the high-speed infrared detectors and high-speed photography.« less

Authors:
; ;  [1]
  1. California Institute of Technology, Pasadena, CA (United States)
Publication Date:
OSTI Identifier:
175395
Report Number(s):
CONF-950686-
TRN: 95:006111-0367
Resource Type:
Conference
Resource Relation:
Conference: Joint applied mechanics and materials summer meeting, Los Angeles, CA (United States), 28-30 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of AMD - MD `95: Summer conference; PB: 520 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; STEELS; DEFORMATION; TITANIUM ALLOYS; ALUMINIUM ALLOYS; VANADIUM ALLOYS; HARDENING; MELTING; SHEAR; STRAIN HARDENING; STRAIN RATE; FINITE ELEMENT METHOD; TEMPERATURE DEPENDENCE

Citation Formats

Rosakis, A J, Ravichandran, G, and Zhou, M. High temperature and deformation field measurements at the vicinity of dynamically growing shear bands. United States: N. p., 1995. Web.
Rosakis, A J, Ravichandran, G, & Zhou, M. High temperature and deformation field measurements at the vicinity of dynamically growing shear bands. United States.
Rosakis, A J, Ravichandran, G, and Zhou, M. Sun . "High temperature and deformation field measurements at the vicinity of dynamically growing shear bands". United States.
@article{osti_175395,
title = {High temperature and deformation field measurements at the vicinity of dynamically growing shear bands},
author = {Rosakis, A J and Ravichandran, G and Zhou, M},
abstractNote = {The phenomenon of dynamic initiation and propagation of adiabatic shear bands is experimentally and numerically investigated. Pre-notched metal plates are subjected to asymmetric impact load histories (dynamic mode-II loading). Dynamic shear bands emanate from the notch tip and propagate rapidly in a direction nearly parallel to the direction of the impact. Real time temperature histories along a line intersecting and perpendicular to the shear band paths are recorded by means of a high-speed infrared detector system. The materials studied are C-300 (a maraging steel) and Ti - 6 Al - 4 V alloy. Experiments show that the peak temperatures inside the propagating shear bands are approaching 90% of the melting point for C-300 and are significantly lower for the titanium alloy (up to 600{degrees}C). Additionally, measured distances of shear band propagation indicate stronger resistance to shear banding by the Ti - 6Al - 4V alloy. Deformation fields around the propagating shear bands are recorded using high-speed photography. Shear band speeds are found to strongly depend on impact velocities, and are as high as 1200 m/s for C-300 steels. Finite Element simulations of the experiments are carried out under the context of plane strain, considering finite deformations, inertia, heat conduction, thermal softening, strain hardening and strain-rate hardening. In the simulations, the shear band propagation is assumed to be governed by a critical plastic strain criterion. The results are compared with experimental measurements obtained using the high-speed infrared detectors and high-speed photography.},
doi = {},
url = {https://www.osti.gov/biblio/175395}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {12}
}

Conference:
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