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A two-parameter model to predict fatigue life of high-strength steels in a very high cycle fatigue regime
Sun CQ(孙成奇); Liu XL(刘小龙); Hong YS(洪友士)
Source PublicationACTA MECHANICA SINICA
2015-06-01
Volume31Issue:3Pages:383-391
ISSN0567-7718
Abstract

In this paper, ultrasonic (20 kHz) fatigue tests were performed on specimens of a high-strength steel in very high cycle fatigue (VHCF) regime. Experimental results showed that for most tested specimens failed in a VHCF regime, a fatigue crack originated from the interior of specimen with a fish-eye pattern, which contained a fine granular area (FGA) centered by an inclusion as the crack origin. Then, a two-parameter model is proposed to predict the fatigue life of high-strength steels with fish-eye mode failure in a VHCF regime, which takes into account the inclusion size and the FGA size. The model was verified by the data of present experiments and those in the literature. Furthermore, an analytic formula was obtained for estimating the equivalent crack growth rate within the FGA. The results also indicated that the stress intensity factor range at the front of the FGA varies within a small range, which is irrespective of stress amplitude and fatigue life.

### (Graphical abstract)

A two-parameter model is proposed to predict the fatigue life of high-strength steels with fish-eye mode failure in a very high cycle fatigue regime, which takes into account the inclusion size and the FGA size. The model was verified by the data of present experiments and those inthe literature. Furthermore, an analytical formula was obtained for estimating the equivalent crack growth rate within FGA. It is also indicated that the stress intensity factor range at the front of the FGA varies within a small range, which is irrespective of stress amplitude and fatigue life. Figure Comparison of predicted fatigue life with experimental data, in which the superscript 4 denotes the specimens by oil-quenching and tempering for 2.5 h in a vacuum at $$300\,^\circ \hbox {C}$$ by a conventional frequency test.

;In this paper, ultrasonic (20 kHz) fatigue tests were performed on specimens of a high-strength steel in very high cycle fatigue (VHCF) regime. Experimental results showed that for most tested specimens failed in a VHCF regime, a fatigue crack originated from the interior of specimen with a fish-eye pattern, which contained a fine granular area (FGA) centered by an inclusion as the crack origin. Then, a two-parameter model is proposed to predict the fatigue life of high-strength steels with fish-eye mode failure in a VHCF regime, which takes into account the inclusion size and the FGA size. The model was verified by the data of present experiments and those in the literature. Furthermore, an analytic formula was obtained for estimating the equivalent crack growth rate within the FGA. The results also indicated that the stress intensity factor range at the front of the FGA varies within a small range, which is irrespective of stress amplitude and fatigue life.

KeywordVery High-cycle Fatigue High-strength Steels Fatigue Life Inclusion Size Crack Growth Rate
DOI10.1007/s10409-015-0451-4
URL查看原文
Indexed BySCI
Language英语
WOS IDWOS:000357448500009
WOS KeywordSubsurface Crack Initiation ; Chromium-bearing Steel ; S-n Curve ; Stress Ratio ; Metallic Materials ; Part i ; Behavior ; Propagation ; Inclusions ; Mechanism
WOS Research AreaEngineering ; Mechanics
WOS SubjectEngineering, Mechanical ; Mechanics
DepartmentLNM金属材料微结构与力学性能
Classification二类
Ranking1
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/52711
Collection非线性力学国家重点实验室
Corresponding AuthorHong YS(洪友士)
AffiliationChinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Sun CQ,Liu XL,Hong YS. A two-parameter model to predict fatigue life of high-strength steels in a very high cycle fatigue regime[J]. ACTA MECHANICA SINICA,2015,31(3):383-391.
APA Sun CQ,Liu XL,&Hong YS.(2015).A two-parameter model to predict fatigue life of high-strength steels in a very high cycle fatigue regime.ACTA MECHANICA SINICA,31(3),383-391.
MLA Sun CQ,et al."A two-parameter model to predict fatigue life of high-strength steels in a very high cycle fatigue regime".ACTA MECHANICA SINICA 31.3(2015):383-391.