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Dynamically Growing Shear Bands in Metals: A Study of Transient Temperature and Deformation Fields

Rosakis, A. J. and Ravichandran, G. and Zhou, M. (1997) Dynamically Growing Shear Bands in Metals: A Study of Transient Temperature and Deformation Fields. In: IUTAM Symposium on Nonlinear Analysis of Fracture. Solid Mechanics and its Applications. No.49. Springer , Dordrecht, pp. 141-150. ISBN 978-94-010-6379-1. https://resolver.caltech.edu/CaltechAUTHORS:20201201-105030731

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Abstract

The objective of our work is (1) to establish the critical conditions for initiation and growth of shear bands in pre-notched plates subjected to asymmetric impact loading (dynamic mode II, see Fig. 1); and (2) to investigate and characterize the transition in the modes of failure when such plates are subjected to a variety of loading rates (impact velocities). These failure modes which may feature either dynamic shear band growth, dynamic crack propagation or both, (see Fig. 1), have been observed in structural materials such as the high strength steels and heat-resistant titanium alloy considered in the present work. The approach is to study both the dynamic mechanical deformations and the processes of heat generation and thermal softening. This necessitates the simultaneous use of high speed optical and infrared diagnostics in the experiments. In parallel to the experimental study, full-scale thermomechanical finite element simulations are conducted to assist the development of criteria for shear band initiation and propagation. The calculations make use of constitutive parameters measured in house through material testing in a variety of strain rates. Such a combined experimental and numerical approach enables us to make direct comparisons between measurements and predictions obtained using various material constitutive and failure models.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/978-94-011-5642-4_14DOIArticle
https://rdcu.be/cbyQGPublisherFree ReadCube access
ORCID:
AuthorORCID
Rosakis, A. J.0000-0003-0559-0794
Ravichandran, G.0000-0002-2912-0001
Additional Information:© 1997 Springer Science+Business Media Dordrecht. The authors gratefully acknowledge support from the Army Research Office through grant No. DAAH 04-93-G0037 under Dr. K. Iyer. We are also grateful to Dr. Y. Rajapakse for support from the Office of Naval Research through grant No. N00014-90-J-1340. The computations were carried out on a Cray C98 computer at the Goddard Space Center and a Cray Y-MP2E/232 computer at the Jet Propulsion Laboratory. Many helpful discussions with Prof. M. Ortiz of Caltech are also acknowledged.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Army Research Office (ARO)DAAH 04-93-G0037
Office of Naval Research (ONR)N00014-90-J-1340
Subject Keywords:Shear Band; Impact Velocity; Adiabatic Shear Band; Dynamic Crack Propagation; Length History
Series Name:Solid Mechanics and its Applications
Issue or Number:49
Record Number:CaltechAUTHORS:20201201-105030731
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201201-105030731
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106862
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:02 Dec 2020 21:43
Last Modified:02 Dec 2020 21:43

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