Tensile Strength of Unidirectional Composites: The Role of Efficiency and Strength of Fiber-Matrix Interface

1995 ◽  
Vol 17 (4) ◽  
pp. 289 ◽  
Author(s):  
WS Johnson ◽  
JE Masters ◽  
S Subramanian ◽  
KL Reifsnider ◽  
WW Stinchcomb
Keyword(s):  
Tensile Strength ◽  
Matrix Interface ◽  
Unidirectional Composites ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

Damping in Unidirectional and Cross-Ply Ceramic Matrix Composites With Matrix Cracks

2001 ◽  
Author(s):  
Victor Birman ◽  
Larry W. Byrd
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Interfacial Friction ◽  
Matrix Composites ◽  
Matrix Interface ◽  
Unidirectional Composites ◽  
Matrix Cracks ◽  
Dissipation Of Energy ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

Abstract The paper elucidates the methods of estimating damping in ceramic matrix composites (CMC) with matrix cracks. Unidirectional composites with bridging matrix cracks and cross-ply laminates with tunneling cracks in transverse layers and bridging cracks in longitudinal layers are considered. It is shown that bridging matrix cracks may dramatically increase damping in unidirectional CMC due to a dissipation of energy along damaged sections of the fiber-matrix interface (interfacial friction). Such friction is absent in the case of tunneling cracks in transverse layers of cross-ply laminates where the changes in damping due to a degradation of the stiffness remain small. However, damping in cross-ply laminates abruptly increases if bridging cracks appear in the longitudinal layers.

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.

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

The Effect of Thermal Aging on Tensile Strength of Three-Dimension and Five-Direction Braided Carbon Fiber/BMI Composites

2010 ◽  
Vol 150-151 ◽  
pp. 1139-1142
Author(s):  
Qi Wei Guo ◽  
Jia Lu Li ◽  
Guo Li Zhang ◽  
Ye Hong He ◽  
Ming Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Carbon Fiber ◽  
Thermal Aging ◽  
Testing Machine ◽  
Tensile Load ◽  
Three Dimension ◽  
Matrix Interface ◽  
Fiber Matrix Interface ◽  
Fiber Matrix ◽  
Universal Material Testing Machine

This work aims at investigating the effect of thermal aging on tensile properties of three-dimension (3D) and five-direction braided carbon fiber/BMI resin composites prepared by resin transfer molding (RTM) process. The influence of high temperature on the tensile strength and the failure mechanisms of un-aged and aged composites were studied, respectively. As for the thermal aging condition, 180 for 24h was selected. The tensile strength of both un-aged and aged specimens were tested by SHIMADZU universal material testing machine at room temperature. The fracture modes of specimens were observed by scanning electron microscopy (SEM). It was found that the tensile load at break and tensile strength decreased after ageing. From the SEM views of the failed samples, the fracture surface presented hackles which were specific to the debonding of the interface between fibers and matrix. A lot of fibers were pulled-out in the aged state specimen. It can be confirmed that the failure occurred at the fiber/matrix interface and the fiber/matrix interface seemed to be weak in aged carbon fabrics reinforced BMI composites.

The Influence of Heat Treatment upon Fiber Pull-Out in a Ceramic Composite

1988 ◽  
Vol 120 ◽  
Author(s):  
M. D. Thouless ◽  
O. Sbaizero ◽  
E. Bischoff ◽  
E. Y. Luh
Keyword(s):  
Ceramic Composite ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
Matrix Interface ◽  
Shear Lag ◽  
Weibull Statistics ◽  
Pull Out ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

AbstractThe toughness of ceramic-matrix composites is strongly influenced by fiber pull-out. The extent of the pull-out depends upon the properties of the fiber and the fiber/matrix interface. Samples of a SiC/LAS composite were subjected to different heat treatments in order to systematically vary these properties. The predicted distribution of the fiber pull-out lengths was calculated by combining a shear lag analysis with Weibull statistics for the fiber strengths. Comparison of the analysis with experiments and microstructural observations contribute to an understanding of the role of the fiber/matrix interface upon the mechanical properties.

Nondestructive Characterization of Fiber-Matrix Adhesion in Composites by Vibration Damping

1995 ◽  
Vol 385 ◽  
Author(s):  
Weiqun Gu ◽  
Guo-Quan Lu ◽  
H. Felix Wu ◽  
Stephen L. Kampe ◽  
P. Ross Lichtenstein ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Glass Fiber ◽  
Fiber Surface ◽  
Vibration Damping ◽  
Matrix Interface ◽  
Fiber Reinforced ◽  
Transverse Tensile ◽  
Fiber Matrix Interface ◽  
Fiber Matrix ◽  
Transverse Tensile Strength

ABSTRACTAdhesion at fiber-matrix interface in fiber-reinforced composites plays an important role in controlling the mechanical properties and overall performance of composites. Among the many available tests applicable to the composite interfaces, vibration damping technique has the advantages of being nondestructive as well as highly sensitive. We set up an optical system to measure the damping tangent delta of a cantilever beam, and correlated the damping data in glass-fiber reinforced epoxy-resin composites with transverse tensile strength which is also a qualitative measurement of adhesion at fiber-matrix interface. Four different composite systems containing three different glass-fiber surface treatments were tested and compared. Our experimental results showed an inverse relationship between damping contributed by the interface and composite transverse tensile strength.

A methodology to predict longitudinal failure in unidirectional composites considering imperfect fiber/matrix interface

2019 ◽  
Author(s):  
José Humberto Almeida Júnior ◽  
Bruna Favoretto ◽  
Lars Bittrich ◽  
Axel Spickenheuer ◽  
Volnei Tita
Keyword(s):  
Matrix Interface ◽  
Unidirectional Composites ◽  
Fiber Matrix Interface ◽  
Fiber Matrix
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