Cyclic fatigue-crack propagation in ceramics: Long and small crack behavior

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Stress/life (S/N) and cyclic fatigue-crack growth properties are studied in a Mg-PSZ, with particular reference to the role of crack size. S/N data from unnotched specimens show markedly lower lives under tension-compression compared to tension-tension loading; fatigue limits'' (at 10{sup 8} cycles) for the former case approach 50% of the tensile strength. Under tension-tension loading, cyclic crack-growth rates of long'' (> 3 mm) cracks are found to be power-law dependent on the stress-intensity range {Delta}K with a fatigue threshold, {Delta}K{sub TH}, of order 50% K{sub c}. Conversely, naturally-occurring small'' (1 to 100 {mu}m) surface cracks were observed to grow at ... continued below

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Pages: (13 p)

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Steffen, A.A.; Dauskardt, R.H. & Ritchie, R.O (Lawrence Berkeley Lab., CA (United States) California Univ., Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering) December 1, 1989.

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Description

Stress/life (S/N) and cyclic fatigue-crack growth properties are studied in a Mg-PSZ, with particular reference to the role of crack size. S/N data from unnotched specimens show markedly lower lives under tension-compression compared to tension-tension loading; fatigue limits'' (at 10{sup 8} cycles) for the former case approach 50% of the tensile strength. Under tension-tension loading, cyclic crack-growth rates of long'' (> 3 mm) cracks are found to be power-law dependent on the stress-intensity range {Delta}K with a fatigue threshold, {Delta}K{sub TH}, of order 50% K{sub c}. Conversely, naturally-occurring small'' (1 to 100 {mu}m) surface cracks were observed to grow at {Delta}K levels some 2 to 3 times smaller than {Delta}K{sub TH}. The implications of such data for structural design with ceramics is briefly discussed. 21 refs., 3 figs., 1 tab.

Physical Description

Pages: (13 p)

Notes

OSTI; NTIS; GPO Dep.

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  • Fatigue '90: 4th international conference on fatigue and fatigue thresholds, Honolulu, HI (United States), 15-20 Jul 1990

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  • Other: DE92000899
  • Report No.: LBL-28243
  • Report No.: CONF-900764--3
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 5294101
  • Archival Resource Key: ark:/67531/metadc1066695

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  • December 1, 1989

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  • Feb. 4, 2018, 10:51 a.m.

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  • April 26, 2018, 12:48 p.m.

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Steffen, A.A.; Dauskardt, R.H. & Ritchie, R.O (Lawrence Berkeley Lab., CA (United States) California Univ., Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering). Cyclic fatigue-crack propagation in ceramics: Long and small crack behavior, article, December 1, 1989; [Livermore,] California. (digital.library.unt.edu/ark:/67531/metadc1066695/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.