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RESEARCH PAPERS

The Effect of Sheet Thickness on Near-Threshold Fatigue Crack Propagation and Oxide and Roughness-Induced Crack Closure

[+] Author and Article Information
K. Tokaji

Department of Mechanical Engineering, Gifu University, 1-1 Yanagido, Gifu, Japan

Z. Ando

Department of Mechanical Engineering, Daido Institute of Technology, 2-21 Daido-cho, Minami-ku, Nagoya, Japan

K. Nagae

Sumitomo Light Metal Industries, Ltd., 3-1-12 Chitose, Minato-ku, Nagoya, Japan

J. Eng. Mater. Technol 109(1), 86-91 (Jan 01, 1987) (6 pages) doi:10.1115/1.3225940 History: Received February 03, 1986; Online September 15, 2009

Abstract

Characteristics of fatigue crack propagation have been investigated in a low carbon steel and a high tensile strength steel to evaluate the effect of sheet thickness. Crack propagation data are generated over a wide range of growth rates, from 10−8 to 10−3 mm/cycle, for load ratios of 0.05 and 0.70 at room temperature in laboratory air. Particular emphasis is placed on behavior at near-threshold growth rates. Near-threshold fatigue crack propagation behavior is found to show a marked sensitivity to sheet thickness, and near-threshold growth rates decrease and threshold values increase with increasing sheet thickness. Oxide and roughness-induced crack closure models are proposed as a mechanism for the effect of sheet thickness on near-threshold fatigue crack propagation. It is also shown that the requirement for specimen thickness recommended by ASTM, W/20≤B≤W/4, is not always valid for near-threshold fatigue crack propagation.

Copyright © 1987 by ASME
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