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Three dimensional cohesive-element analysis and experiments of dynamic fracture in C300 steel

Pandolfi, A. and Guduru, P. R. and Ortiz, M. and Rosakis, A. J. (2000) Three dimensional cohesive-element analysis and experiments of dynamic fracture in C300 steel. International Journal of Solids and Structures, 37 (27). pp. 3733-3760. ISSN 0020-7683. https://resolver.caltech.edu/CaltechAUTHORS:20171213-085245977

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Abstract

The dynamic drop-weight test is taken as a convenient basis for assessing the fidelity and predictive ability of cohesive models of fracture in applications involving dynamic crack growth. In the experimental phase of the study, coherent gradient sensing (CGS) has been used to study dynamic fracture in C300 maraging steel. The specimens were subjected to three-point bend impact loading under a drop weight tower. High-speed photographs of the CGS interferograms were analyzed to determine the crack tip location, the velocity and the dynamic fracture toughness as a function of time. Post-mortem examination of the specimens revealed the fractography of the fracture surfaces, including the development of shear lips. In a parallel numerical phase of the study, fracture has been modeled by recourse to an irreversible cohesive law embedded into cohesive elements. These cohesive elements govern all aspects of the separation and closure of the incipient cracks. The cohesive behavior of the material is assumed to be rate independent. The finite element model is three dimensional and consists of quadratic ten-noded tetrahedra. The numerical simulations have proven highly predictive of a number of observed features, including: the crack growth initiation time; the trajectory of the propagating crack tip; and the formation of shear lips near the lateral surfaces. The simulations therefore establish the feasibility of using cohesive models of fracture and cohesive elements to predict dynamic crack-growth initiation and propagation in three dimensions.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/S0020-7683(99)00155-9DOIArticle
https://www.sciencedirect.com/science/article/pii/S0020768399001559PublisherArticle
ORCID:
AuthorORCID
Pandolfi, A.0000-0002-7084-7456
Ortiz, M.0000-0001-5877-4824
Rosakis, A. J.0000-0003-0559-0794
Additional Information:© 2000 Elsevier. Received 9 November 1998, Revised 6 May 1999, Available online 23 March 2000. The support of the Office of Naval Research through grant N00014-95-1-0453 is gratefully acknowledged.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-95-1-0453
Subject Keywords:Dynamic fracture; Coherent gradient sensing; 3D cohesive elements; C300 steel; Three point bend; Drop weight test
Issue or Number:27
Record Number:CaltechAUTHORS:20171213-085245977
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20171213-085245977
Official Citation:A. Pandolfi, P.R. Guduru, M. Ortiz, A.J. Rosakis, Three dimensional cohesive-element analysis and experiments of dynamic fracture in C300 steel, In International Journal of Solids and Structures, Volume 37, Issue 27, 2000, Pages 3733-3760, ISSN 0020-7683, https://doi.org/10.1016/S0020-7683(99)00155-9. (http://www.sciencedirect.com/science/article/pii/S0020768399001559)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83853
Collection:CaltechAUTHORS
Deposited By: Lydia Suarez
Deposited On:13 Dec 2017 22:47
Last Modified:09 Mar 2020 13:19

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