不同加载频率下FV520B-I的疲劳行为与疲劳寿命

doi:10.11896/j.issn.1005-023X.2018.16.025

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Abstract Fatigue tests for FV520B-I were carried out at two frequencies: the conventional frequency (140 Hz) and the ultrasonic frequency (20 kHz). The experiment data indicated that fatigue life at the ultrahigh loading frequency was higher than the one under the low loading frequency at the same stress amplitude, but the fatigue strength (450 MPa) at the ultrahigh loading frequency was lower than the one (500 MPa) under the low loading frequency. By analyzing the fracture of the specimen using scanning electron microscope, it was shown that with the dramatic increase of loading frequency, cause of fatigue failure changed from surface roughness defect to internal non-metallic inclusions. Fatigue life conversion model for FV520B-I were established with comprehensive use of a fitting algorithm based on the combination of experimental data and classic three-parameter-model. The fatigue life conversion coefficient for FV520B-I was proposed, whose value increased with the increasing of stress amplitude. A clear understand of the effect of loading frequency on the fatigue property of FV520B-I was given, which has a great significance in guaranteeing the accuracy of the actual fatigue analysis of FV520B-I in the remanufacturing engineering.

Key words： ultra-high cycle fatigue FV520B-I loading frequency fatigue life conversion three-parameter-model

Published: 18 September 2018

CLC number:	O346.2+3
	U467.4+97
	TH11

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	Articles by authors
	ZHAO Qingchen
	WANG Jinlong
	ZHANG Yuanliang
	SHEN Yihong
	LIU Shujie

Cite this article:

ZHAO Qingchen,WANG Jinlong,ZHANG Yuanliang, et al. Fatigue Behavior and Fatigue Life for FV520B-I at Different Loading Frequencies[J]. Materials Reports, 2018, 32(16): 2837-2841.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.16.025 OR http://www.mater-rep.com/EN/Y2018/V32/I16/2837

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