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Dynamic Crack Initiation in Ductile Steels

Guduru, P. R. and Singh, R. P. and Ravichandran, G. and Rosakis, A. J. (1998) Dynamic Crack Initiation in Ductile Steels. Journal of the Mechanics and Physics of Solids, 46 (10). pp. 1997-2016. ISSN 0022-5096. http://resolver.caltech.edu/CaltechAUTHORS:20150226-154026983

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Abstract

The goal of the work presented here is to study dynamic crack initiation in ductile steels (Ni–Cr steel and 304 stainless steel) at different loading rates and to establish appropriate dynamic failure criteria. A variety of infrared and visible optical methods and high-speed photography are used in this study. Precracked steel specimens are subjected to dynamic three-point bend loading by impacting them in a drop weight tower. During the dynamic deformation and fracture initiation process the time history of the transient temperature in the vicinity of the crack tip is recorded experimentally using a high-speed infrared detector. The dynamic temperature trace in conjunction with the HRR solution is used to determine the time history of the dynamic J-integral J^d(t), and to establish the dynamic fracture initiation toughness, J^d_c. The measurements made using high-speed thermography are validated through comparison with determination of J^d(t) by dynamic optical measurements of the crack tip opening displacement (CTOD). Finally, the micromechanisms of fracture initiation are investigated by studying the fracture surface using scanning electron microscopy.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/S0022-5096(98)00035-0 DOIArticle
http://www.sciencedirect.com/science/article/pii/S0022509698000350PublisherArticle
Additional Information:© 1998 Elsevier Science Ltd. Received 19 December 1997; in revised form 13 February 1997. The authors would like to acknowledge the support of the Office of Naval Research under Grant No. N00014-95-1-0453 (Dr G. Yodder and Dr Y. D. S. Rajapakse, Scientific Officers) and of the Department of Energy under Grant No. De-FG03-95 ER14560 (Dr R. Goulard, Project officer). The authors are grateful to Dr D. M. Owen, Caltech, for his help in conducting the scanning electron microscopy and for other useful discussions.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-95-1-0453
Department of Energy (DOE)De-FG03-95 ER14560
Subject Keywords:fracture toughness; dynamic fracture; elastic plastic material; electron microscopy
Record Number:CaltechAUTHORS:20150226-154026983
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150226-154026983
Official Citation:P.R. Guduru, R.P. Singh, G. Ravichandran, A.J. Rosakis, Dynamic crack initiation in ductile steels, Journal of the Mechanics and Physics of Solids, Volume 46, Issue 10, 1 October 1998, Pages 1997-2016, ISSN 0022-5096, http://dx.doi.org/10.1016/S0022-5096(98)00035-0. (http://www.sciencedirect.com/science/article/pii/S0022509698000350)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55284
Collection:CaltechAUTHORS
Deposited By: Cheryl Gause
Deposited On:03 Mar 2015 00:33
Last Modified:29 Sep 2016 23:35

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