Investigation Of Mode Ii Crack Growth Following A Very High Speed Impact

doi:10.2140/jomms.2008.3.271

IMECH-IR > 力学所知识产出(1956-2008)

	Investigation Of Mode Ii Crack Growth Following A Very High Speed Impact
	Ma W(马维); Duan ZP(段祝平); Ma, W (reprint author), Chinese Acad Sci, Inst Mech, 15 Beisihuanxi Rd, Beijing 100080, Peoples R China.
发表期刊	Journal of Mechanics of Materials And Structures
	2008
卷号	3 期号:2 页码:271-290
ISSN	1559-3959
摘要	A recoverable plate impact testing technology has been developed for studying fracture mechanisms of mode II crack. With this technology, a single duration stress pulse with submicrosecond duration and high loading rates, up to 10(8) MPam(1/2)s(-1), can be produced. Dynamic failure tests of Hard-C 60# steel were carried out under asymmetrical impacting conditions with short stress-pulse loading. Experimental results show that the nucleation and growth of several microcracks ahead of the crack tip, and the interactions between them, induce unsteady crack growth. Failure mode transitions during crack growth, both from mode I crack to mode II and from brittle to ductile fracture, were observed. Based on experimental observations, a discontinuous crack growth model was established. Analysis of the crack growth mechanisms using our model shows that the shear crack extension is unsteady when the extending speed is between the Rayleigh wave speed c(R) and the shear wave speed c(S). However, when the crack advancing speed is beyond c(S), the crack grows at a steady intersonic speed approaching root 2c(S). It also shows that the transient mechanisms, such as nucleation, growth, interaction and coalescence among microcracks, make the main crack speed jump from subsonic to intersonic and the steady growth of all the subcracks causes the main crack to grow at a stable intersonic speed.
关键词	Plate Impact Tests Dynamic Fracture Failure Mode Transition Intersonic Crack Extension Discontinuous Crack Growth Model Dynamic Fracture Propagation Transitions Initiation Plate
DOI	10.2140/jomms.2008.3.271
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000256438800005
关键词[WOS]	DYNAMIC FRACTURE ; PROPAGATION ; TRANSITIONS ; INITIATION ; PLATE
WOS研究方向	Materials Science ; Mechanics
WOS类目	Materials Science, Multidisciplinary ; Mechanics
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/26022
专题	力学所知识产出(1956-2008)
通讯作者	Ma, W (reprint author), Chinese Acad Sci, Inst Mech, 15 Beisihuanxi Rd, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Ma W,Duan ZP,Ma, W . Investigation Of Mode Ii Crack Growth Following A Very High Speed Impact[J]. Journal of Mechanics of Materials And Structures,2008,3,2,:271-290.
APA	Ma W,Duan ZP,&Ma, W .(2008).Investigation Of Mode Ii Crack Growth Following A Very High Speed Impact.Journal of Mechanics of Materials And Structures,3(2),271-290.
MLA	Ma W,et al."Investigation Of Mode Ii Crack Growth Following A Very High Speed Impact".Journal of Mechanics of Materials And Structures 3.2(2008):271-290.

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