Micro-mechanical approximation to the stress field around an inclined fiber of FRCC

Hu, Xiao, Day, Robert and Dux, Peter (2002) Micro-mechanical approximation to the stress field around an inclined fiber of FRCC. Mechanics Research Communications, 29 1: 27-34. doi:10.1016/S0093-6413(02)00226-4


Author Hu, Xiao
Day, Robert
Dux, Peter
Title Micro-mechanical approximation to the stress field around an inclined fiber of FRCC
Journal name Mechanics Research Communications   Check publisher's open access policy
ISSN 0093-6413
Publication date 2002-06-06
Sub-type Article (original research)
DOI 10.1016/S0093-6413(02)00226-4
Volume 29
Issue 1
Start page 27
End page 34
Total pages 8
Editor B.A. Boley
Place of publication New York, N.Y. U.S.A.
Publisher Pergamon
Collection year 2002
Language eng
Subject C1
290805 Geotechnical Engineering
680403 Civil
Abstract Matrix spalling or crushing is one of the important mechanisms of fiber-matrix interaction of fiber reinforced cementitious composites (FRCC). The fiber pullout mechanisms have been extensively studied for an aligned fiber but matrix failure is rarely investigated since it is thought not to be a major affect. However, for an inclined fiber, the matrix failure should not be neglected. Due to the complex process of matrix spalling, experimental investigation and analytical study of this mechanism are rarely found in literature. In this paper, it is assumed that the load transfer is concentrated within the short length of the inclined fiber from the exit point towards anchored end and follows the exponential law. The Mindlin formulation is employed to calculate the 3D stress field. The simulation gives much information about this field. The 3D approximation of the stress state around an inclined fiber helps to qualitatively understand the mechanism of matrix failure. Finally, a spalling criterion is proposed by which matrix spalling occurs only when the stress in a certain volume, rather than the stress at a small point, exceeds the material strength. This implies some local stress redistribution after first yield. The stress redistribution results in more energy input and higher load bearing capacity of the matrix. In accordance with this hypothesis, the evolution of matrix spalling is demonstrated. The accurate prediction of matrix spalling needs the careful determination of the parameters in this model. This is the work of further study. (C) 2002 Elsevier Science Ltd. All rights reserved.
Keyword Mechanics
Fiber Reinforced Composite
Inclined Fiber
Matrix Spalling
Fiber-matrix Interaction
3d Stress Field
Spalling Criterion
Composites
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Civil Engineering Publications
 
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Created: Tue, 14 Aug 2007, 17:46:15 EST