Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9704003 | International Journal of Fatigue | 2005 | 9 Pages |
Abstract
The objective of this study was to evaluate the statistical fatigue properties of a thin sheet of a stainless steel for use as an abrasion strip on helicopter rotor blades made of glass fiber/epoxy composite materials. The sheet was an AISI 301 1/4-hard stainless steel. Tensile fatigue tests were conducted up to 107 cycles on unnotched specimens under constant amplitude loading in the large-strain regions for stress ratios (=minimum stress/maximum stress) R=0 and 0.3. The test results provided S-N relationships for R=0 and 0.3, the standard deviation of fatigue life and fatigue strength in the inclined part and the mean and standard deviation of fatigue strength in the horizontal part of the S-N curve for R=0. Strain measurements during fatigue tests clarified the change of true stress in specimens and estimated the fatigue crack propagation period. SEM revealed the details of the fatigue-fracture surfaces formed by the repetition of large strains. The applicability of this material as an abrasion strip is discussed on the basis of the test results.
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Mechanical Engineering
Authors
Toshiyuki Shimokawa, Yasumasa Hamaguchi, Shigeru Machida, Takeshi Ogawa, Hiroaki Itabe,