Microcracks tunneling in brittle matrix composites driven by thermal expansion mismatch

by: S Ho, Z Suo

Acta Metallurgica et Materialia, Vol. 40, No. 7. (July 1992), pp. 1685-1690.

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Abstract

During processing, brittle composites are susceptible to cracks caused by residual stress. Matrix cracks parallel to fibers are considered in this paper. Each crack initiates from a porosity, confined by the neighboring fibers, tunneling in the matrix. The analysis uses the concept of steady-state tunneling, which eliminates several analytical artifacts in a previous calculation. The cracking coefficient is computed for the full range of elastic mismatch and several fiber arrangements, and is presented in a form that can be used in selecting viable constituents. Calculations also demonstrate that fiber-matrix interface plays a major role in cracking. A sliding interface relaxes tunnel edges, and thereby the energy release rate at the tunnel front.

@article{citeulike:763431, abstract = {During processing, brittle composites are susceptible to cracks caused by residual stress. Matrix cracks parallel to fibers are considered in this paper. Each crack initiates from a porosity, confined by the neighboring fibers, tunneling in the matrix. The analysis uses the concept of steady-state tunneling, which eliminates several analytical artifacts in a previous calculation. The cracking coefficient is computed for the full range of elastic mismatch and several fiber arrangements, and is presented in a form that can be used in selecting viable constituents. Calculations also demonstrate that fiber-matrix interface plays a major role in cracking. A sliding interface relaxes tunnel edges, and thereby the energy release rate at the tunnel front.}, author = {Ho, S. and Suo, Z. }, citeulike-article-id = {763431}, doi = {http://dx.doi.org/10.1016/0956-7151(92)90111-Q}, journal = {Acta Metallurgica et Materialia}, keywords = {composite, crack}, month = {July}, number = {7}, pages = {1685--1690}, posted-at = {2006-07-18 21:05:10}, priority = {2}, title = {Microcracks tunneling in brittle matrix composites driven by thermal expansion mismatch}, url = {http://dx.doi.org/10.1016/0956-7151(92)90111-Q}, volume = {40}, year = {1992} }

RIS record

TY - JOUR ID - citeulike:763431 L3 - citeulike-article-id:763431 N2 - During processing, brittle composites are susceptible to cracks caused by residual stress. Matrix cracks parallel to fibers are considered in this paper. Each crack initiates from a porosity, confined by the neighboring fibers, tunneling in the matrix. The analysis uses the concept of steady-state tunneling, which eliminates several analytical artifacts in a previous calculation. The cracking coefficient is computed for the full range of elastic mismatch and several fiber arrangements, and is presented in a form that can be used in selecting viable constituents. Calculations also demonstrate that fiber-matrix interface plays a major role in cracking. A sliding interface relaxes tunnel edges, and thereby the energy release rate at the tunnel front. IS - 7 JF - Acta Metallurgica et Materialia EP - 1690 TI - Microcracks tunneling in brittle matrix composites driven by thermal expansion mismatch VL - 40 SP - 1685 KW - composite KW - crack AU - Ho, S AU - Suo, Z PY - 1992/07// UR - http://dx.doi.org/10.1016/0956-7151(92)90111-Q ER -

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