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Dynamic shear band propagation and micro-structure of adiabatic shear band

Li, Shaofan and Liu, Wing-Kam and Qian, Dong and Guduru, Pradeep R. and Rosakis, Ares J. (2001) Dynamic shear band propagation and micro-structure of adiabatic shear band. Computer Methods in Applied Mechanics and Engineering, 191 (1-2). pp. 73-92. ISSN 0045-7825. https://resolver.caltech.edu/CaltechAUTHORS:20170408-164301757

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Abstract

Meshfree Galerkin approximations in both two and three dimensions have been used in simulations of dynamic shear band propagation in an asymmetrically impact-loaded prenotched plate. Failure mode switching and failure mode transitions, which have been reported experimentally, are replicated in numerical computations. For intermediate impact speed (25m/s<V⩽30m/s), the numerical results show that a cleavage crack initiates from the tip of the dynamic shear band, indicating a dominance of brittle failure mode, and a failure mode switch (ductile-to-brittle: shearband-to-crack). For high impact velocities (V>30m/s), the numerical results show that a dynamic shear band penetrates through the specimen without trace of cleavage-type fracture, which is a ductile failure mode. Overall, with the increase of impact speed, the final failure mode of the impacted plate transits from brittle failure to ductile failure. By introducing a multi-physics model to describe the stress collapse state of the shear band, it has been found that there is a non-uniform temperature distribution inside the adiabatic shear band. Strong evidences indicate that temperature distribution inside the shear band has periodic patterns in both space and time, confirming the latest experimental results of P. Guduru et al. [Mech. Mater. (2000), submitted]. This suggests that there may exist a thermal–mechanical instability within the adiabatic shear band, reminiscent of hydrodynamic instability due to viscous heating.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/S0045-7825(01)00245-6DOIArticle
https://www.sciencedirect.com/science/article/pii/S0045782501002456PublisherArticle
Additional Information:© 2001 Elsevier. Received 23 November 2000, Revised 16 February 2001, Available online 25 October 2001. This work is supported by grants from the Army Research Office, National Science Foundation, and Tull Family Endowment.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Army Research Office (ARO)UNSPECIFIED
NSFUNSPECIFIED
Tull Family EndowmentUNSPECIFIED
Subject Keywords:Adiabatic shear band; Dynamic shear band propagation; Crack propagation; Failure mode transition; Meshfree methods; Strain localization; Multi-physics modeling
Issue or Number:1-2
Record Number:CaltechAUTHORS:20170408-164301757
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170408-164301757
Official Citation:Shaofan Li, Wing-Kam Liu, Dong Qian, Pradeep R. Guduru, Ares J. Rosakis, Dynamic shear band propagation and micro-structure of adiabatic shear band, Computer Methods in Applied Mechanics and Engineering, Volume 191, Issues 1–2, 2001, Pages 73-92, ISSN 0045-7825, https://doi.org/10.1016/S0045-7825(01)00245-6. (http://www.sciencedirect.com/science/article/pii/S0045782501002456)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76238
Collection:CaltechAUTHORS
Deposited By: 1Science Import
Deposited On:09 Mar 2018 00:02
Last Modified:03 Oct 2019 16:58

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