Journal Published Online: 01 November 1986
Volume 14, Issue 6

A Method for Determining Conservative Fatigue Threshold While Avoiding Crack Closure

CODEN: JTEVAB

Abstract

The low-rate fatigue properties of a mild steel are obtained on small compact-type (CT) specimens while avoiding crack closure. These properties are similar to those of butt-welded joints obtained at a much lower stress ratio in the range −1 to 0.5. This is a result of the existence of tensile residual stress at the crack tip of the welded joint which prevents crack closure even at low stress ratios. It is concluded that the most conservative fatigue crack propagation properties, including fatigue threshold values, can be easily obtained by confirming that the results are the same for CT specimens tested at different terminal stress ratios using a ΔK decreasing method which avoids crack closure.

Author Information

Matsuoka, S
Fatigue Testing Division, National Research Institute for Metals, Tokyo, Japan
Takeuchi, E
Fatigue Testing Division, National Research Institute for Metals, Tokyo, Japan
Kosuge, M
Fatigue Testing Division, National Research Institute for Metals, Tokyo, Japan
Shimodaira, M
Fatigue Testing Division, National Research Institute for Metals, Tokyo, Japan
Ohta, A
Fatigue Testing Division, National Research Institute for Metals, Tokyo, Japan
Nishijima, S
Fatigue Testing Division, National Research Institute for Metals, Tokyo, Japan
Pages: 6
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: JTE10348J
ISSN: 0090-3973
DOI: 10.1520/JTE10348J