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Title: Strain-rate effect on brittle failure in compression

Abstract

A simple model of an array of interacting, dynamically growing wing cracks is used to simulate the rate-dependent dynamic damage evolution and subsequent brittle failure of solids under compression. The validity of the model is discussed. Parameters which identify the overall failure by the coalescence of compression-induced, interacting, tensile microcracks are calculated in closed form, and relations between microstructure and the corresponding rate dependency of the overall response are examined in some detail. It is shown that the experimentally observed change in the compressive failure stress with increasing strain rate, may be considered to be a consequence of the generation and dynamic growth of interacting, compression-induced, tensile microcracks. Examples of brittle failure in uniaxial stress and uniaxial strain conditions, respectively, produced in the Hopkinson compression bar and normal plate-impact experiments, are discussed in terms of this model.

Authors:
;  [1]
  1. (Univ. of California, San Diego, La Jolla, CA (United States). Dept. of Applied Mechanics and Engineering Sciences)
Publication Date:
OSTI Identifier:
5150432
Resource Type:
Journal Article
Journal Name:
Acta Metallurgica et Materialia; (United States)
Additional Journal Information:
Journal Volume: 42:3; Journal ID: ISSN 0956-7151
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; CRACKS; COMPOSITE MATERIALS; BRITTLENESS; COMPRESSION STRENGTH; MATHEMATICAL MODELS; TENSILE PROPERTIES; MATERIALS; MECHANICAL PROPERTIES; 360203* - Ceramics, Cermets, & Refractories- Mechanical Properties; 360603 - Materials- Properties

Citation Formats

Nemat-Nasser, S., and Deng, H. Strain-rate effect on brittle failure in compression. United States: N. p., 1994. Web. doi:10.1016/0956-7151(94)90295-X.
Nemat-Nasser, S., & Deng, H. Strain-rate effect on brittle failure in compression. United States. doi:10.1016/0956-7151(94)90295-X.
Nemat-Nasser, S., and Deng, H. Tue . "Strain-rate effect on brittle failure in compression". United States. doi:10.1016/0956-7151(94)90295-X.
@article{osti_5150432,
title = {Strain-rate effect on brittle failure in compression},
author = {Nemat-Nasser, S. and Deng, H.},
abstractNote = {A simple model of an array of interacting, dynamically growing wing cracks is used to simulate the rate-dependent dynamic damage evolution and subsequent brittle failure of solids under compression. The validity of the model is discussed. Parameters which identify the overall failure by the coalescence of compression-induced, interacting, tensile microcracks are calculated in closed form, and relations between microstructure and the corresponding rate dependency of the overall response are examined in some detail. It is shown that the experimentally observed change in the compressive failure stress with increasing strain rate, may be considered to be a consequence of the generation and dynamic growth of interacting, compression-induced, tensile microcracks. Examples of brittle failure in uniaxial stress and uniaxial strain conditions, respectively, produced in the Hopkinson compression bar and normal plate-impact experiments, are discussed in terms of this model.},
doi = {10.1016/0956-7151(94)90295-X},
journal = {Acta Metallurgica et Materialia; (United States)},
issn = {0956-7151},
number = ,
volume = 42:3,
place = {United States},
year = {1994},
month = {3}
}