EVALUATION METHOD OF FATIGUE DAMAGE UNDER VARIABLE AMPLITUDE STRESS BASED ON PLASTIC STRAIN

Acta Metall Sin

2009, Vol. 45

Issue (12): 1461-1465 DOI:

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EVALUATION METHOD OF FATIGUE DAMAGE UNDER VARIABLE AMPLITUDE STRESS BASED ON PLASTIC STRAIN

ZHANG Jiwang; LU Liantao; SHEN Xunliang; YI Hongfei; ZHANG Weihua

State Key Laboratory of Traction Power; Southwest Jiaotong University; Chengdu 610031

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ZHANG Jiwang LU Liantao SHEN Xunliang YI Hongfei ZHANG Weihua. EVALUATION METHOD OF FATIGUE DAMAGE UNDER VARIABLE AMPLITUDE STRESS BASED ON PLASTIC STRAIN. Acta Metall Sin, 2009, 45(12): 1461-1465.

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Abstract

The fatigue damage under the stress amplitude below fatigue limit is evaluated based on the modified Miner’s rule usually. The medium carbon railway axle steel shows obvious cyclic softening or hardening behavior during fatigue process. The result of rotary bending fatigue test on medium railway axle steel shows that the stress–life data above the fatigue limit tally with three parameter mode. Therefore the fatigue damage of this steel under variable amplitude stress can’t be evaluated based on the stress linear cumulate damage rule. According to the rotary bending fatigue data obtained from the rotary bending fatigue test under constant and high–low two levels periodic variable amplitude stress, a method oevaluating variable rotary bending fatigue damage of mterial whose icline part of the S–N curve under constant amplitude stress loading is curve, was presented. Considering the cyclic hardening or cyclic softening durig the ftigue process, the stress–life data were transformed to the inear plastic strain–life data according to the cyclic constitutive retionship of this material. Afterward the fatigue damage under varible amplitude stress was evaluated by plastic strain obeying the strain linear cumulate damage rule.

Key words: variable amplitude stre cycle constitutive plastic strin fatigue damage

Received: 08 June 2009

ZTFLH:	TG111
	TG135

Fund:

Supported by National Basic Research Program of China (No.2007C714705) and National Natural Science Foundation of China (Nos.50671086 and 50821063)

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	ZHANG Ji-Wang
	LV Lian-Shou
	CHEN Xun-Liang
	YI Hong-Fei
	ZHANG Wei-Hua

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I12/1461

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