Interfacial shear strength studies of nicalon fibers in epoxy matrix using single fiber composite test

1995 ◽  
Vol 16 (6) ◽  
pp. 542-548 ◽  
Author(s):  
A. Ho ◽  
A. N. Netravali ◽  
S. L. Phoenix
Keyword(s):  
Shear Strength ◽  
Epoxy Matrix ◽  
Interfacial Shear Strength ◽  
Fiber Composite ◽  
Interfacial Shear ◽  
Single Fiber

A NOVEL HEMISPHERICAL MICROBOND SPECIMEN FOR EVALUATING THE INTERFACIAL SHEAR STRENGTH OF A SINGLE FIBER COMPOSITE

2010 ◽  
Vol 24 (15n16) ◽  
pp. 3059-3064
Author(s):  
JOO-EON PARK ◽  
NAK-SAM CHOI ◽  
JA-UK GU
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Fiber Composite ◽  
Interfacial Shear ◽  
Fiber Reinforced Composites ◽  
Single Fiber ◽  
Reinforced Composites ◽  
Strength Data ◽  
Pull Out ◽  
Teflon Film

In this paper, a novel hemispherical microbond specimen is proposed for evaluating the interfacial shear strength of fiber-reinforced composites. A hemispherical microbond specimen was developed with the insertion of a pin-holed, Teflon film into a droplet matrix surrounding a single fiber. This experimental test offered more reliable strength data in the hemispherical specimen. Thus, the hemispherical microbond specimen is recommended to be suitable for evaluation of interfacial shear strength as a convenient alternative for the cylindrical pull-out test.

scholarly journals Effect of nanoclay (Kaolinite) on mechanical properties of epoxy-fiber composite

2020 ◽  
Vol 12 (01) ◽  
pp. 38-43
Author(s):  
Hisham M Hasan ◽  
◽  
Ahmed R Majeed ◽  
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Shear Strength ◽  
Tensile Test ◽  
Carbon Fibers ◽  
Epoxy Matrix ◽  
Interfacial Shear Strength ◽  
Fiber Composite ◽  
Weight Fraction ◽  
Interfacial Shear

An experimental investigation using drag-out tensile test to calculate the interfacial shear strength for different embedded lengths of Kevlar and carbon fibers reinforced epoxy matrix with nanoclay (kaolinite) for different ratio weight, the interfacial shear strength increased by with increasing of embedded length and ratio weight fraction of nanoclay that adding to epoxy matrix.

scholarly journals Multiscale Modeling of Fiber Fragmentation Process in Aligned ZnO Nanowires Enhanced Single Fiber Composites

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Parisa Marashizadeh ◽  
Mohammad Abshirini ◽  
Jingyu Wang ◽  
Mrinal C. Saha ◽  
Yingtao Liu
Keyword(s):  
Shear Strength ◽  
Multiscale Modeling ◽  
Interfacial Shear Strength ◽  
Fiber Composites ◽  
Interfacial Shear ◽  
Zno Nanowires ◽  
Single Fiber ◽  
Computational Domain ◽  
The Matrix ◽  
Fiber Fragmentation

AbstractA three-dimensional multiscale modeling framework is developed to analyze the failure procedure of radially aligned zinc oxide (ZnO) enhanced single fiber composites (SFC) under tensile loading to understand the interfacial improvement between the fiber and the matrix. The model introduces four levels in the computational domain. The nanoscale analysis calculates the size-dependent material properties of ZnO nanowires. The interaction between ZnO nanowires and the matrix is simulated using a properly designed representative volume element at the microscale. At the mesoscale, the interface between the carbon fiber and the surrounding area is modeled using the cohesive zone approach. A combination of ABAQUS Finite element software and the failure criteria modeled in UMAT user subroutine is implemented to simulate the single fiber fragmentation test (SFFT) at the macroscale. The numerical results indicate that the interfacial shear strength of SFC can be improved up to 99% after growing ZnO nanowires on the fiber. The effect of ZnO nanowires geometries on the interfacial shear strength of the enhanced SFC is also investigated. Experimental ZnO nanowires enhanced SFFTs are performed on the fabricated samples to validate the results of the developed multiscale model. A good agreement between the numerical and the experimental results was observed.

Size Effect on Microbond Testing Interfacial Shear Strength of Fiber-Reinforced Composites

2019 ◽  
Vol 86 (7) ◽  
Author(s):  
Qiyang Li ◽  
Guodong Nian ◽  
Weiming Tao ◽  
Shaoxing Qu
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Size Effect ◽  
Epoxy Matrix ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Experimental Results ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Material Systems

Microbond tests have been widely used for studying the interfacial mechanical properties of fiber-reinforced composites. However, experimental results reveal that the interfacial shear strength (IFSS) depends on the length of microdroplet-embedded fiber (le). Thus, it is essential to provide an insight into this size effect on IFSS. In this paper, microbond tests are conducted for two kinds of widely used composites, i.e., glass fiber/epoxy matrix and carbon fiber/epoxy matrix. The lengths of microdroplet-embedded glass fiber and carbon fiber are in the ranges from 114.29 µm to 557.14 µm and from 63.78 µm to 157.45 µm, respectively. We analyze the representative force–displacement curves, the processes of interfacial failure and frictional sliding, and the maximum force and the frictional force as functions of le. Experimental results show that IFSS of both material systems monotonically decreases with le and then approaches a constant value. The finite element model is used to analyze the size effect on IFSS and interfacial failure behaviors. For both material systems, IFSS predicted from simulations is consistent with that obtained from experiments. Moreover, by analyzing the shear stress distribution, a transition of interface debonding is found from more or less uniform separation to crack propagation when le increases. This study reveals the mechanism of size effect in microbond tests, serving as an effective method to evaluate the experimental results and is critical to guidelines for the design and optimization of advanced composites.

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