Interfaces Studied by Electromechanical Pull-Out Testing

1996 ◽  
Vol 458 ◽  
Author(s):  
Xuli Fu ◽  
D. D. L. Chung
Keyword(s):  
Electrical Resistivity ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Steel Fiber ◽  
Contact Resistivity ◽  
Matrix Interface ◽  
Preparation Conditions ◽  
Pull Out ◽  
Fiber Matrix Interface

ABSTRACTThe experimental technique of electromechanical pull-out testing is introduced to study the interface between fiber and matrix. The technique involves measuring both the contact electrical resistivity and the shear bond strength of a fiber-matrix interface. Samples that are identically prepared differ in contact resistivity and bond strength, which correlate. The correlation allows determination of even small differences in bond strength due to differences in sample preparation conditions. It also gives information on the structure of the interface and allows the bond strength to be nondestructively determined by measuring the contact resistivity. The technique is demonstrated for the interface between steel fiber and cement.

scholarly journals Influence of Oxidation Damages on Mechanical Properties of SiC/SiC Composite Using Domestic Hi-Nicalon Type SiC Fibers

Scanning ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Enze Jin ◽  
Denghao Ma ◽  
Zeshuai Yuan ◽  
Wenting Sun ◽  
Hao Wang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Tensile Modulus ◽  
Treatment Temperature ◽  
Matrix Interface ◽  
Oxidation Treatment ◽  
Pull Out ◽  
Special Surface ◽  
Higher Temperature ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

Here, we show that when the oxidation treatment temperature exceeded 600°C, the tensile strength of SiC/SiC begins to decrease. Oxidation leads to the damages on the PyC fiber/matrix interface, which is replaced by SiO2 at higher temperature. The fracture mode converts from fiber pull-out to fiber-break as the fiber/matrix interface is filled with SiO2. Oxidation time also plays an important role in affecting the tensile strength of SiC/SiC. The tensile modulus decreases with temperature from RT to 800°C, then increases above 800°C due to the decomposition of remaining CSi x O y and crystallization of the SiC matrix. A special surface densification treatment performed in this study is confirmed to be an effective approach to reduce the oxidation damages and improve the tensile strength of SiC/SiC after oxidation.

Methods for Determination of Rubber to Cord Bond Strength

1959 ◽  
Vol 32 (3) ◽  
pp. 898-906
Author(s):  
R. V. Uzina ◽  
L. S. Gromova ◽  
S. A. Vasil'eva
Keyword(s):  
Bond Strength ◽  
Laboratory Method ◽  
Single Thread ◽  
Vulcanized Rubber ◽  
Pull Out ◽  
Cord Fabric ◽  
Fabric Structures

Abstract In selecting methods for determination of rubber to cord bond strength it is necessary to consider the factors which are subject to variation in the system— the type of cord, the composition of the vulcanized rubber, or the composition of the impregnant. The selection (composition) of the methods of assessment of bond strength was carried out in the present study while keeping the type of cord and the rubber compositions constant ; only the composition of the impregnant was varied. Up to the present there has been no single laboratory method for evaluating rubber to cord bond strength for the determination of the service quality of rubber-fabric structures. The bond strength in such a system is assessed in the majority of cases by the use of a series of methods. The existing methods may be systematized according to the nature of the deformation (static or dynamic), the nature of the specimen (with single thread of cord or with cord fabric) and so on. We adopted the following classification of methods: 1). Determination of bond strength of a single thread of cord with the rubber; 2). Determination of bond strength of rubber to fabric model specimens. Determination of bond strength of a single thread of cord with rubber is an exceptionally widely used type of testing in the rubber industry. It is based either on the principle of stripping of a single thread of cord from the rubber under pressure, or on the principle of pull-out of a thread of cord from a rubber specimen.

Fiber pullout model for aligned hooked-end steel fiber

2010 ◽  
Vol 37 (9) ◽  
pp. 1179-1188 ◽  
Author(s):  
P. Ghoddousi ◽  
R. Ahmadi ◽  
M. Sharifi
Keyword(s):  
Shear Stress ◽  
Analytical Model ◽  
Fiber Length ◽  
Steel Fiber ◽  
Matrix Interface ◽  
Force Component ◽  
Interfacial Bond ◽  
Fiber Pullout ◽  
Proposed Model ◽  
Fiber Matrix Interface

The main objective of this study is to derive an analytical model for the pullout behavior of hooked-end steel fiber. The pullout behavior of hooked-end steel fiber comprises a component due to interfacial bond stress at the fiber–matrix interface and a component due to mechanical anchorage at the hook end of the fiber. To study the first component, the effects of hooks on the distributions of the force and stresses along the fiber length are analyzed. Then these results are used, with the concept of bond shear stress versus slip relation between fiber and matrix, to obtain a force component due to the interfacial bond. After that the required theoretical relations are obtained to determine the component due to the mechanical anchorages. Finally, the model is validated with two existing experimental results on the hooked-end steel fiber pullout. The results show that the proposed model is able to estimate the pullout behavior of hooked-end steel fiber.

In situ determination of the fiber–matrix interface tensile strength

2015 ◽  
Vol 50 (5) ◽  
pp. 589-599 ◽  
Author(s):  
Kyle R Totten ◽  
Bender Kutub ◽  
Leif A Carlsson
Keyword(s):  
Tensile Strength ◽  
Matrix Interface ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

Effect of Aging on Interfacial Properties of Glass Fiber Reinforced Concrete

1990 ◽  
Vol 211 ◽  
Author(s):  
S. P Shah ◽  
Z. Li ◽  
B. Mobasher
Keyword(s):  
Surface Energy ◽  
Bond Strength ◽  
Specific Surface ◽  
Glass Fiber ◽  
Shear Bond Strength ◽  
Interfacial Properties ◽  
Fiber Reinforced Concrete ◽  
Specific Surface Energy ◽  
Pull Out ◽  
Frictional Bond

AbstractThis paper explores the behavior of the interface of glass fiber and cementitious matrix under the effect of aging. Pull-out tests of multiple alkali resistant glass fiber strands embedded in portland cement paste matrix were conducted. Four different curing regimes of 3 and 14 days normal curing, in addition to 3 and 7 days accelerated aging were employed. A recently developed method of characterizing interfacial properties was used to identify and evaluate the important parameters at interface. The experimental data are presented on the parameter of shear stiffness of a fiber-matrix boundary layer, the shear bond strength, the frictional bond strength and the specific surface energy as a function of fiber embedded length. It was observed that aging had a larger effect on the stiffness of the interface, the shear bond strength and the specific surface energy than on the frictional bond.

Assessment of the fiber/matrix interface bond strength in SiC/Ti-6Al-4V composites

1999 ◽  
Vol 259 (2) ◽  
pp. 220-227 ◽  
Author(s):  
S.G. Warrier ◽  
P. Rangaswamy ◽  
M.A.M. Bourke ◽  
S. Krishnamurthy
Keyword(s):  
Bond Strength ◽  
Matrix Interface ◽  
Interface Bond Strength ◽  
Fiber Matrix Interface ◽  
Fiber Matrix ◽  
Interface Bond
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