Cyclic fatigue experiments and analysis of silicon nitrides -- stepwise loading

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Journal of Engineering Materials and Technology

DOI:https://doi.org/10.1115/1.2807012· OSTI ID:289468

Chiu, Y P ^[1]

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1. Torrington Co., CT (United States)

Rotating beam fatigue test has been performed at room temperature for two types of advanced hot-pressed silicon nitrides. The test completion modes consist of fast fracture, fatigue fracture, and runout (at about 10{sup 8} cycles). Some specimens tested have been subjected to step-up load testing. Application of Weibull statistical method has been made as the fatigue lives of specimens under a constant bending load are subjected to wide scatter. A maximum likelihood analysis was applied to test data obtained from the single load and step-up load tests to determine the fatigue (or crack growth) exponent. The effect of specimen surface finish on fast and fatigue fracture has also been investigated using the Weibull analysis.

• Sponsoring Organization: USDOE
• OSTI ID: 289468
• Journal Information: Journal of Engineering Materials and Technology, Journal Name: Journal of Engineering Materials and Technology Journal Issue: 4 Vol. 120; ISSN 0094-4289; ISSN JEMTA8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPUTER CALCULATIONS
FATIGUE
RELIABILITY
SERVICE LIFE
SILICON NITRIDES
STATISTICAL DATA
STRESSES