The effect of a graded interphase on the mechanism of stress transfer in a fiber-reinforced composite

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	The effect of a graded interphase on the mechanism of stress transfer in a fiber-reinforced composite
	Yao Y(姚寅); Chen SH(陈少华); Chen PJ(陈培见); Chen, SH (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
发表期刊	MECHANICS OF MATERIALS
	2013-03
卷号	58 页码:35-54
ISSN	0167-6636
摘要	Based on an improved shear-lag model, the effect of an inhomogeneous interphase on the mechanism of stress transfer in fiber-reinforced composites is investigated. The inhomogeneity of the interphase is represented by the graded feature of the Young's modulus varying according to a power law or a linear one in the radius direction, while the Poisson's ratio and thermal expansion coefficient are assumed to be constants. Considering the effects of the inhomogeneous interphase as well as the Poisson's contraction and thermal residual stress, closed-form solutions to the axial fiber stress and interfacial shear stress are obtained analytically. Comparing the case with a power law to that with a linear one, we find that the fiber stress increases significantly in the former case, while it decreases slightly in the latter one with an increasing interphase thickness. With the same external tensile load and interphase thickness, it is found that the fiber in the power law case is subjected to a larger tensile stress than that in the linear variation one. However, the interfacial shear stress is not sensitive to the interphase thickness in both cases, except that near the two ends of fiber. Under the same external load, the maximum shear stress in the interphase is much smaller in the latter than that in the former. All the phenomena can be characterized by one parameter, i.e., the average Young's modulus of interphase, and denote that an interphase with a power variation law is more effective for stress transfer while the linearly graded one is more advantageous to avoid shear failure. The results should be helpful for engineers to properly design the interphase in novel composites, e.g. a carbon-fiber reinforced epoxy one.
关键词	Fiber-reinforced Composites Graded Interphase Shear-lag Model Stress Transfer Shear Failure
学科领域	固体力学
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000315061500004
项目资助者	NSFC [10972220, 11125211, 11021262]; Nano 973 Project [2012CB937500]
课题组名称	LNM仿生材料与固体的微尺度力学
论文分区	一类
引用统计	被引频次：40[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/47113
专题	非线性力学国家重点实验室
通讯作者	Chen, SH (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
推荐引用方式 GB/T 7714	Yao Y,Chen SH,Chen PJ,et al. The effect of a graded interphase on the mechanism of stress transfer in a fiber-reinforced composite[J]. MECHANICS OF MATERIALS,2013,58:35-54.
APA	Yao Y,Chen SH,Chen PJ,&Chen, SH .(2013).The effect of a graded interphase on the mechanism of stress transfer in a fiber-reinforced composite.MECHANICS OF MATERIALS,58,35-54.
MLA	Yao Y,et al."The effect of a graded interphase on the mechanism of stress transfer in a fiber-reinforced composite".MECHANICS OF MATERIALS 58(2013):35-54.

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