Corrected stress field intensity approach based on averaging superior limit of intrinsic damage dissipation work

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Abstract In the present paper, corrected stress field intensity obtained by averaging of the superior limit of intrinsic damage dissipation work in critical domain, which considers thoroughly thermodynamic consistency within irreversible thermodynamic framework, is proposed for predictions of high-cycle fatigue endurance limits. Simultaneously, the effect of mean stress, additional hardening behavior related of non-proportional loading paths and stress gradients on multiaxial high-cycle fatigue are taken into account in the proposed approach. The approach is an extension of the general stress field intensity (GSFI) proposed by Yao and co-workers in 1996. For a better comparison, existing multiaxial high-cycle fatigue criteria (proposed by Freitas, Papadoulous and Yao) were employed to predict the endure limits of different metallic materials subjected to different multiaxial loading paths, and it is shown that our proposal performs better from statistical value of error indexes. The approach of corrected stress field intensity (CSFI) and its associated concepts in the present paper provide a new conception to predict endurance limits of multiaxial high-cycle fatigue with high accuracy.

Key words�� Intrinsic Damage Dissipation Work Irreversible Thermodynamic Framework Corrected Stress Field Intensity Multiaxial High-cycle Fatigue Stress Gradients

Received: 09 August 2017 Published: 14 November 2018

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	PENG Yan
	YANG -Liu
	MING -Zhang

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PENG Yan,YANG -Liu,MING -Zhang. Corrected stress field intensity approach based on averaging superior limit of intrinsic damage dissipation work[J]. Journal of Iron and Steel Research International, 2018, 25(10): 1094-1103.

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http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/ OR http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/Y2018/V25/I10/1094

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