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Title: Fractography and Crack Initiation of Very-High-Cycle Fatigue for a High Carbon Low Alloy Steel
Author: Zhou CE(周承恩); Qian GA(钱桂安); Hong YS(洪友士)
Source: Key Enginering Materials
Issued Date: 2006
Volume: 324-325, Pages:1113-1116
Abstract: Very-High-Cycle Fatigue (VHCF) is the phenomenon of fatigue damage and failure of metallic materials or structures subjected to 108 cycles of fatigue loading and beyond. This paper attempts to investigate the VHCF behavior and mechanism of a high strength low alloy steel (main composition: C-1% and Cr-1.5%; quenched at 1108K and tempered at 453K). The fractography of fatigue failure was observed by optical microscopy and scanning electron microscopy. The observations reveal that, for the number of cycles to fatigue failure between 106 and 4108 cycles, fatigue cracks almost initiated in the interior of specimen and originated at non-metallic inclusions. An “optical dark area” (ODA) around initiation site is observed when fatigue initiation from interior. ODA size increases with the decrease of fatigue stress, and becomes more roundness. Fracture mechanics analysis gives the stress intensity factor of ODA, which is nearly equivalent to the corresponding fatigue threshold of the test material. The results indicate that the fatigue life of specimens with crack origin at the interior of specimen is longer than that with crack origin at specimen surface. The experimental results and the fatigue mechanism were further analyzed in terms of fracture mechanics and fracture physics, suggesting that the primary propagation of fatigue crack within the fish-eye local region is the main characteristics of VHCF.
Language: 英语
Indexed Type: EI
DOC Type: Article
ISSN: 1013-9826
Subject: 力学
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/17653
Appears in Collections:力学所知识产出(1956-2008)_期刊论文

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