Twodimensional shear bands growing dynamically in plates: An investigation of transient deformation fields, temperature fields and shear band toughness
Abstract
The phenomenon of dynamic initiation and propagation of twodimensional adiabatic shear bands is experimentally and numerically investigated. Prenotched metal plates are subjected to asymmetric impact load histories (dynamic modeII loading). Dynamic shear bands emanate from the notchtip and propagate rapidly in a direction nearly parallel to the direction of 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 C300 (a maraging steel), HY100 steel and Ti6Al4V. Experiments show that the peak temperatures inside the propagating shear bands are approaching 90% of the melting point for C300 and are significantly lower for the titanium alloy (up to 6000C). Additionally, measured distances of shear band propagation indicate stronger resistance to shear banding by HY100 steel and Ti6Al4V. Deformation fields around the propagating shear band are recorded using high speed photography. Shear band speeds are found to strongly depend on impact velocity are as high as 1200 m/s for C300 steel. Finite element simulations of the experiment are carried out under the context of plane strain, considering finite deformations, inertia, heat conduction, thermal softening, strain hardening and strainrate hardening. In themore »
 Authors:

 California Institute of Technology, Pasadena, CA (United States)
 Publication Date:
 OSTI Identifier:
 175094
 Report Number(s):
 CONF950686
TRN: 95:0061110002
 Resource Type:
 Conference
 Resource Relation:
 Conference: Joint applied mechanics and materials summer meeting, Los Angeles, CA (United States), 2830 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; TITANIUM ALLOYS; DEFORMATION; STEELS; ALUMINIUM ALLOYS; CRACKS; SHEAR; STRAIN HARDENING; STRAIN RATE; VELOCITY; MATHEMATICAL MODELS
Citation Formats
Rosakis, A J. Twodimensional shear bands growing dynamically in plates: An investigation of transient deformation fields, temperature fields and shear band toughness. United States: N. p., 1995.
Web.
Rosakis, A J. Twodimensional shear bands growing dynamically in plates: An investigation of transient deformation fields, temperature fields and shear band toughness. United States.
Rosakis, A J. Sun .
"Twodimensional shear bands growing dynamically in plates: An investigation of transient deformation fields, temperature fields and shear band toughness". United States.
@article{osti_175094,
title = {Twodimensional shear bands growing dynamically in plates: An investigation of transient deformation fields, temperature fields and shear band toughness},
author = {Rosakis, A J},
abstractNote = {The phenomenon of dynamic initiation and propagation of twodimensional adiabatic shear bands is experimentally and numerically investigated. Prenotched metal plates are subjected to asymmetric impact load histories (dynamic modeII loading). Dynamic shear bands emanate from the notchtip and propagate rapidly in a direction nearly parallel to the direction of 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 C300 (a maraging steel), HY100 steel and Ti6Al4V. Experiments show that the peak temperatures inside the propagating shear bands are approaching 90% of the melting point for C300 and are significantly lower for the titanium alloy (up to 6000C). Additionally, measured distances of shear band propagation indicate stronger resistance to shear banding by HY100 steel and Ti6Al4V. Deformation fields around the propagating shear band are recorded using high speed photography. Shear band speeds are found to strongly depend on impact velocity are as high as 1200 m/s for C300 steel. Finite element simulations of the experiment are carried out under the context of plane strain, considering finite deformations, inertia, heat conduction, thermal softening, strain hardening and strainrate 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. Finally, the numerical calculations are used to investigate motions of shear band toughness. The shear band driving force is calculated as a function of shear band velocity and compared to the crack driving force versus velocity relations for modeI, opening cracks in the same material.},
doi = {},
url = {https://www.osti.gov/biblio/175094},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {12}
}