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Dynamic shear bands: an investigation using high speed optical and infrared diagnostics

Guduru, P. R. and Rosakis, A. J. and Ravichandran, G. (2001) Dynamic shear bands: an investigation using high speed optical and infrared diagnostics. Mechanics of Materials, 33 (7). pp. 371-402. ISSN 0167-6636 . http://resolver.caltech.edu/CaltechAUTHORS:20150227-145757124

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Abstract

This paper presents an experimental investigation of the initiation and propagation characteristics of dynamic shear bands in C300 maraging steel. Pre-fatigued single edge notched specimens were impacted on the edge under the notch to produce shear dominated mixed mode stress fields. The optical technique of coherent gradient sensing (CGS) was employed to study the evolution of the mixed mode stress intensity factors. Simultaneously, a newly developed two-dimensional high speed infrared (IR) camera was employed to observe the temperature field evolution during the initiation and propagation of the shear bands. Possible criteria for failure mode selection are discussed. The IR images, for the first time, revealed the transition of crack tip plastic zone into a shear band and also captured the structure of the tip of a propagating shear band. These thermographs support the notion of a diffuse shear band tip and reveal “hot spots” distributed along the length of a well-developed shear band.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/S0167-6636(01)00051-5 DOIArticle
http://www.sciencedirect.com/science/article/pii/S0167663601000515PublisherArticle
Additional Information:© 2001 Elsevier Science Ltd. Received 10 October 2000; received in revised form 27 November 2000. This work was supported by the Office of Naval Research grant # N00014-95-1-0453 (Dr. Y.D.S. Rajapakse, project manager) and the engineering research program of the office of Basic Energy Sciences at the Department of Energy through grant No. DE-F603-95ER14560 (Dr. Robert Price, Project officer). Additional funding for the development of the infrared camera was provided by the National Science Foundation through the Center for Quantitative Visualization at Caltech (Professor M. Gharib, Director). We are also pleased to acknowledge the contributions of Professor A.T. Zehnder, Cornell University, for his pivotal role in developing the high speed IR camera. PRG acknowledges many useful discussions with Dr. David M. Owen, Caltech throughout this work.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-95-1-0453
Department of Energy (DOE)DE-F603-95ER14560
NSFUNSPECIFIED
Subject Keywords:Infrared temperature measurement; Failure mode transition; Shear bands
Record Number:CaltechAUTHORS:20150227-145757124
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150227-145757124
Official Citation:P.R Guduru, A.J Rosakis, G Ravichandran, Dynamic shear bands: an investigation using high speed optical and infrared diagnostics, Mechanics of Materials, Volume 33, Issue 7, July 2001, Pages 371-402, ISSN 0167-6636, http://dx.doi.org/10.1016/S0167-6636(01)00051-5. (http://www.sciencedirect.com/science/article/pii/S0167663601000515)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55346
Collection:CaltechAUTHORS
Deposited By: Cheryl Gause
Deposited On:03 Mar 2015 00:46
Last Modified:29 Sep 2016 23:33

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