Analytical investigation of effect of stress ratio on threshold stress intensity factor range improved by overload
International Journal of Structural Integrity
ISSN: 1757-9864
Article publication date: 2 March 2012
Abstract
Purpose
The purpose of this paper is to describe the effects of stress ratio (R) on the threshold stress intensity factor range (ΔKth) by applied overload and to conduct an analytical investigation of the effect of the stress ratio.
Design/methodology/approach
Tensile overload was applied to a compact tension specimen, and fatigue tests were performed at R=0.1 or 0.5.
Findings
The value of ΔKth increased as the tensile overload was increased, and the nominal threshold values were given by the equation ΔNKth,R = C+ DKov, where C represents ΔKth, and D is a proportional constant. Experimental results showed that the value of D showed good agreement with theoretical value.
Originality/value
The paper proposes a new model that arrests crack growth or makes cracks harmless by utilizing the overload effect.
Keywords
Citation
Houjou, K., Takahashi, K. and Ando, K. (2012), "Analytical investigation of effect of stress ratio on threshold stress intensity factor range improved by overload", International Journal of Structural Integrity, Vol. 3 No. 1, pp. 53-60. https://doi.org/10.1108/17579861211209993
Publisher
:Emerald Group Publishing Limited
Copyright © 2012, Emerald Group Publishing Limited