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TECHNICAL PAPERS

Simulations of Crack Propagation in Porous Materials

[+] Author and Article Information
T. Nakamura, Z. Wang

Department of Mechanical Engineering, State University of New York, Stony Brook, NY 11794

J. Appl. Mech 68(2), 242-251 (Jul 26, 2000) (10 pages) doi:10.1115/1.1356029 History: Received December 14, 1999; Revised July 26, 2000
Copyright © 2001 by ASME
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References

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Figures

Grahic Jump Location
Relationships between normalized displacement and traction used cohesive model. The shaded areas represent the fracture energy. (a) Normal component for Mode I, (b) tangential component for Mode II.
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(a) Schematic of edge-crack panel used in the error analysis. (b) Top-half of finite element mesh near crack tip. All the elements in this zone are shaped square with the side length equal to 1/400 of the panel width.
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Three cases with different domains where cohesive elements are placed. (a) Case A with cohesive elements only along the crack path; (b) Case B with cohesive elements in 0.04W×0.38W domain; (c) Case C with cohesive elements in 0.1W×0.38W domain.
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Computed results for various reference displacements δn* in Case A. (a) Normalized energy release rate shown as a function of normalized prescribed displacement, (b) normalized load shown as a function of normalized prescribed displacement.
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Computed results for various reference displacements δn* in Case A. (a) Normalized crack advanced distance shown as a function of normalized prescribed displacement, (b) normalized energy release rate shown as a function of normalized crack advance distance.
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Normalized energy release rate for various reference displacements δn*. (a) Case B, (b) Case C.
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(a) Schematic of panel with porous material under tensile load. The starter crack is placed in the center of the panel. (b) Finite element mesh. Regions with porous elements are indicated.
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Sequences of crack growth at three levels of prescribed displacements. Only the region near the starter crack is shown for clarity. The starter crack grows toward neighboring pores.
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Computed results of porous material under tensile load. (a) Load versus displacement. A small drop in the load is due to a large jump in crack length. (b) Effective crack length (crack length profile) versus displacement.
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(a) Schematic of multilayered model with porous coatings. Regions with cohesive elements are indicated. (b) Top part of finite element mesh for the multilayered model.
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Sequences of crack growth at three levels of temperatures. Only the ceramic coating is shown for clarity. The starter crack grows toward neighboring pores.
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Computed results of porous material under temperature increase. (a) average residual stress within porous ceramic coating; (b) effective (apparent) crack length as a function of temperature.

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