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Measuring the Effective Fracture Toughness of Heterogeneous Materials

Hsueh, Chun-Jen and Ravichandran, Guruswami and Bhattacharya, Kaushik (2016) Measuring the Effective Fracture Toughness of Heterogeneous Materials. In: Fracture, Fatigue, Failure and Damage Evolution. Conference Proceedings of the Society for Experimental Mechanics. Vol.8. Springer , Cham, pp. 151-155. ISBN 978-3-319-21610-2. http://resolver.caltech.edu/CaltechAUTHORS:20160211-094810104

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Abstract

Heterogeneous materials where the scale of the heterogeneities is small compared to the scale of applications are common in nature. These materials are also engineered synthetically with the aim of improving performance. The overall properties of heterogeneous materials can be different from those of its constituents; however, it is challenging to characterize effective fracture toughness of these materials. We present a new method of experimentally determining the effective fracture toughness. The key idea is to impose a steady process at the macroscale while allowing the fracture process to freely explore at the level of microstructure. We apply a time-dependent displacement boundary condition called the surfing boundary condition that corresponds to a steadily propagating macroscopic crack opening displacement. We then measure the full-field displacement using digital image correlation (DIC) method, and use it to obtain the macroscopic energy release rate. In particular, we develop a global approach to extract information from DIC. The effective toughness is obtained at the peak of the energy release rate. Finally, the full field images also provide us insight into the role of the microstructure in determining effective toughness.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/978-3-319-21611-9_19DOIArticle
ORCID:
AuthorORCID
Bhattacharya, Kaushik0000-0003-2908-5469
Additional Information:© 2016 The Society for Experimental Mechanics, Inc. We gratefully acknowledge the financial support of the U.S. National Science Foundation (Grant No. CMMI-1201102).
Group:GALCIT
Funders:
Funding AgencyGrant Number
NSFCMMI-1201102
Subject Keywords:Fracture toughness; Heterogeneous material; Surfing boundary conditions; Digital image correlation; Brittle material
Record Number:CaltechAUTHORS:20160211-094810104
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160211-094810104
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64415
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Feb 2016 00:20
Last Modified:10 Sep 2018 15:00

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