Pullout Tests Behavior of Polyester Matrix Reinforced with Malva Fiber

2016 ◽  
Vol 869 ◽  
pp. 371-376 ◽  
Author(s):  
Jean Igor Margem ◽  
Vinicius Alves Gomes ◽  
Frederico Muylaert Margem ◽  
Carolina Gomes Dias Ribeiro ◽  
Fabio de Oliveira Braga ◽  
...  
Keyword(s):  
Shear Stress ◽  
Interfacial Shear Stress ◽  
Interfacial Strength ◽  
Critical Length ◽  
Matrix Composites ◽  
Composite Matrix ◽  
Pullout Tests ◽  
Polyester Matrix ◽  
Fiber Matrix ◽  
Reinforcing Fiber

The interface between a composite matrix and the reinforcing fiber plays an important role in the efficiency by which an applied load is transmitted throughout the composite structure. The shear stress at the fiber/matrix interface can be associated with this load transference and, consequently, will affect the composite strength. In the present work, pullout tests were used to evaluate the interfacial shear stress of malva fiber in polyester matrix composites. A small critical length was found for the malva fiber embedded in polyester, which corresponds to a relatively weak fiber/matrix bond and lower interfacial strength.

An Analytical Model of Stress-Transfer in the Nano-Composites with Debonding Interface

2010 ◽  
Vol 163-167 ◽  
pp. 4599-4603
Author(s):  
Wen Liang Zhu ◽  
Dong Mei Luo ◽  
Ying Long Zhou ◽  
Wen Xue Wang
Keyword(s):  
Shear Stress ◽  
Analytical Model ◽  
Load Transfer ◽  
Polymer Matrix Composites ◽  
Axial Stress ◽  
Interfacial Shear Stress ◽  
Stress Transfer ◽  
Matrix Composites ◽  
Load Transfer Efficiency ◽  
First Time

An improved shear-lag analytical model has been established to study stress transfer in carbon nanotube (CNT) reinforced polymer matrix composites with and without debonding interface. The Poisson’s effect and radial effect of matrix is considered in the model for the first time, and a simplified 2D representative volume element (RVE) is modeled using a four-phase composite composed of matrix, nanotube, bonded, and debonded interfaces in this analysis, and the axial stress for CNT and matrix and interfacial shear stress along the CNT is predicted. The results show that load transfer efficiency in CNT reinforced composites is affected by the debonding length, and the abrupt change of shear stress is existent at the tip of debonding interface.

Role of Fiber-Matrix Interfacial Shear Stress on the Toughness of Reinforced Oxide Matrix Composites

1988 ◽  
Vol 120 ◽  
Author(s):  
Raj N. Singh
Keyword(s):  
Shear Stress ◽  
Interfacial Shear Stress ◽  
Ceramic Matrix Composites ◽  
Interfacial Shear ◽  
Matrix Cracking ◽  
Shear Stresses ◽  
Matrix Composites ◽  
Zircon Ceramic ◽  
Strength And Toughness

AbstractMullite and zircon ceramic matrix composites uniaxially reinforced with as-supplied and BN-coated silicon carbide filaments were fabricated. The filament-matrix interfacial shear stresses were measured by a modified indentation technique and mechanical properties were determined in flexure mode. Significant improvements in strength and toughness were observed for the composites in comparison to monolithic mullite and zircon ceramics. Lower filament-matrix interfacial shear stresses were measured in composites with BN-coated filaments than in composites containing as-supplied filaments. The influence of filament-matrix interfacial shear stress on the critical stress for first matrix cracking, maximum composite strength, and toughness of the composites were studied.

Pullout Tests of Sisal Fibers in Epoxy Matrix for Characterization of Interfacial Shear Stress

2012 ◽  
pp. 383-390
Author(s):  
Wellington Pereira Inácio ◽  
Artur Camposo Pereira ◽  
Sergio Neves Monteiro ◽  
Fernando Wypych ◽  
Rafael Marangoni
Keyword(s):  
Shear Stress ◽  
Epoxy Matrix ◽  
Interfacial Shear Stress ◽  
Interfacial Shear ◽  
Pullout Tests ◽  
Sisal Fibers

Layered Interphases in Ceramic Matrix Composites and Relation with Interfacial Behaviour

2006 ◽  
Vol 45 ◽  
pp. 1475-1482
Author(s):  
Dominique Rouby ◽  
A. Kaflou ◽  
Pascal Reynaud ◽  
Sylvain Jacques ◽  
O. Rapaud
Keyword(s):  
Shear Stress ◽  
Interfacial Shear Stress ◽  
Chemical Vapour ◽  
Ceramic Matrix Composites ◽  
Initial Position ◽  
Matrix Composites ◽  
Polished Cross Section ◽  
Interfacial Behaviour ◽  
Sliding Resistance ◽  
Load Displacement

Unidirectional SiC/SiC minicomposites were produced by infiltration of a Hi-Nicalon fibre tow by using pulsed chemical vapour deposition (P-CVD). The sequence of precursor gazes inlet steps determines the structure of the Pyrocarbon/TiC layered interphase deposited first on the filaments. The SiC matrix is then deposited with a given thickness. The different interphase structures will be described. The interface behaviour was characterized by indentation method. The load is applied on the fibre-end at a polished cross-section of the composite, and the displacement of that fibre-end is measured. The push-in test on thick specimens shows that the fibre debonds at a given fibre stress and then slides under a certain frictional shear stress. Both parameters increase when the TiC layers become discontinuous, like aligned TiC clusters in a Pyrocarbon matrix. The load-displacement behaviour is in very good agreement with theory when the interfacial shear stress is kept constant, non depending on relative slip displacement. The push-through test on thin composite slices gives directly access to sliding resistance because the fibre is less compressed. The load displacement curves obtained will be described and analysed. For example, sliding velocity jumps revealed a slight increase in sliding resistance with velocity. During push-back, a seating drop was recorded as the fibre returns in its initial position, illustrating a certain effect of roughness.

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