A model of toughening effects in whisker-reinforced composites

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Description

A numerical approach is presented that lends itself to modeling the screening or antiscreening effects due solely to modulus differences of a discrete array of whiskers in an elastic matrix. The method is applied to single whiskers, and to examining the issue of whisker orientation of the toughness of ceramic composites. The model results indicate that crack-tip shielding due to modulus defect interactions occurs when the reinforcement has a higher modulus than the matrix material, and that anti-shielding occurs for the opposite case. Results for a single whisker located at the crack-tip (maximum effect) indicate that the crack-tip stress intensity ... continued below

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Pages: (20 p)

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Hoagland, R.G. (Washington State Univ., Pullman, WA (United States). Dept. of Mechanical and Materials Engineering) & Henager, C.H. Jr. (Pacific Northwest Lab., Richland, WA (United States)) January 1, 1991.

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Description

A numerical approach is presented that lends itself to modeling the screening or antiscreening effects due solely to modulus differences of a discrete array of whiskers in an elastic matrix. The method is applied to single whiskers, and to examining the issue of whisker orientation of the toughness of ceramic composites. The model results indicate that crack-tip shielding due to modulus defect interactions occurs when the reinforcement has a higher modulus than the matrix material, and that anti-shielding occurs for the opposite case. Results for a single whisker located at the crack-tip (maximum effect) indicate that the crack-tip stress intensity is reduced by about 10% when a modulus ratio of four is assumed. Calculations performed with whisker arrays demonstrate pronounced effects of whisker orientation on the crack-tip screening, being larger for whiskers oriented perpendicular to the crack plane, as expected. Ordered whisker arrays produce larger and more uniform screening than do random whisker arrays. 16 refs., 10 figs.

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Pages: (20 p)

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OSTI; NTIS; GPO Dep.

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  • Other: DE92000226
  • Report No.: PNL-SA-16936
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/5206401 | External Link
  • Office of Scientific & Technical Information Report Number: 5206401
  • Archival Resource Key: ark:/67531/metadc1059726

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Creation Date

  • January 1, 1991

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 31, 2018, 1 p.m.

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Hoagland, R.G. (Washington State Univ., Pullman, WA (United States). Dept. of Mechanical and Materials Engineering) & Henager, C.H. Jr. (Pacific Northwest Lab., Richland, WA (United States)). A model of toughening effects in whisker-reinforced composites, report, January 1, 1991; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1059726/: accessed December 9, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.