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Development of a Dynamic Decohesion Criterion for Subsonic Fracture of the Interface between Two Dissimilar Materials

Lambros, John and Rosakis, Ares J. (1995) Development of a Dynamic Decohesion Criterion for Subsonic Fracture of the Interface between Two Dissimilar Materials. Proceedings of the Royal Society of London. Series A, Mathematical, Physical and Engineering Sciences, 451 (1943). pp. 711-736. ISSN 0962-8444. http://resolver.caltech.edu/CaltechAUTHORS:20141203-091643410

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Abstract

We present findings of an experimental study of dynamic decohesion of bimaterial systems composed of constituents with a large material property mismatch. Poly-methylmethacrylate (PMMA)-steel and PMMA-aluminium bimaterial fracture specimens were used. Dynamic one-point bend loading was accomplished with a drop-weight tower device (for low and intermediate loading rates) or a high-speed gas gun (for high loading rates). High-speed interferometric measurements were made using the lateral shearing interferometer of coherent gradient sensing in conjunction with high-speed photography. Very high crack propagation speeds (terminal crack-tip speeds up to 1.5c_s^(PMMA), where c_s^(PMMA) is the shear wave speed of PMMA) and high accelerations (of about 10^7g, where g is the acceleration of gravity) were observed and are reported. Issues regarding data analysis of the high-speed interferograms are discussed. The effects of near-tip three-dimensionality are also analysed. Dynamic complex stress factor histories are obtained by fitting the experimental data to avail-able asymptotic crack-tip fields. A dynamic crack growth criterion for crack growth along bimaterial interfaces is proposed. In the subsonic regime of crack growth it is seen that the opening and shearing displacements behind the propagating crack tip remain constant and equal to their value at initiation, i.e. the crack retains a self-similar profile during crack growth at any speed. This forms the basis of the proposed dynamic interfacial fracture criterion.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://www.jstor.org/stable/52746JSTORArticle
http://dx.doi.org/10.1098/rspa.1995.0151 DOIArticle
http://rspa.royalsocietypublishing.org/content/451/1943/711PublisherArticle
Additional Information:© 1995 The Royal Society. Received 5 August 1994; revised 7 February 1995; accepted 11 April 1995. The support of ONR Grant N00014-90-J-1340 and NSF Grant MSS-9024838 is gratefully appreciated.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-90-J-1340
NSFMSS-9024838
Record Number:CaltechAUTHORS:20141203-091643410
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141203-091643410
Official Citation:Development of a Dynamic Decohesion Criterion for Subsonic Fracture of the Interface between Two Dissimilar Materials John Lambros and Ares J. Rosakis Proceedings: Mathematical and Physical Sciences, Vol. 451, No. 1943 (Dec. 8, 1995), pp. 711-736 Published by: The Royal Society Article Stable URL: http://www.jstor.org/stable/52746
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52311
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:03 Dec 2014 21:15
Last Modified:20 Sep 2016 23:13

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