Strength and Interfacial Properties of Ceramic Composites

1986 ◽  
Vol 78 ◽  
Author(s):  
D. B. Narshall
Keyword(s):  
Interfacial Properties ◽  
Ceramic Composites ◽  
Interface Properties ◽  
Matrix Interface ◽  
Direct Measurements ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

ABSTRACTResults of recent micromechanics analyses of the reinforcing influence of frictionally bonded fibers in ceramic composites are summnarized. Direct measurements of the fiber/matrix interface properties are also discussed.

Determination of Fiber/Matrix Interface Mechanical Properties in Brittle-Matrix Composites

1990 ◽  
Vol 194 ◽  
Author(s):  
Ronald J. Kerans ◽  
Paul D. Jero ◽  
Triplicane A. Parthasarathy ◽  
Amit Chatterjee
Keyword(s):  
Mechanical Properties ◽  
Ceramic Composites ◽  
Interface Properties ◽  
Matrix Composites ◽  
Matrix Interface ◽  
Intermetallic Matrix ◽  
Fiber Matrix Interface ◽  
Fiber Matrix ◽  
Intermetallic Matrix Composites

AbstractIt has been evident for some time that the mechanical properties of the fiber/matrix interface play an important role in determining the mechanical behavior of ceramic composites (for reviews, see [1], [2], and [3[). Recently there has been a growing interest in the role of the fiber/matrix interface in intermetallic matrix composites. While ceramic and intermetallic composites are certainly very different materials, understanding the behavior of one will provide insight into the other. Furthermore, the basic issues regarding the determination of interface properties are the same. The accuracy of micromechanics models of any composite system is dependent upon the accuracy of all the constituent and interface properties. It is far preferable to measure actual materials constants rather than test-specific quantities. The tests described here are intended to measure the interfacial shear strength (or mode II toughness) and the interfacial tensile strength. The objective of this work is to briefly outline a few of the approaches which are being evaluated for and applied to ceramic composites, and which may be of interest to investigators working in intermetallic composites.

The temperature effect on the inter-laminar shear properties and failure mechanism of 3D orthogonal woven composites

2020 ◽  
Vol 90 (23-24) ◽  
pp. 2806-2817
Author(s):  
Juanzi Li ◽  
Wei Fan ◽  
Tao Liu ◽  
Linjia Yuan ◽  
Lili Xue ◽  
...  
Keyword(s):  
High Temperature ◽  
Failure Mechanism ◽  
Failure Modes ◽  
Woven Composites ◽  
Interface Properties ◽  
Matrix Interface ◽  
Fiber Matrix Interface ◽  
Fiber Matrix ◽  
3D Orthogonal Woven ◽  
Laminar Shear

Recent increases in the use of carbon fiber reinforced plastics, especially for high-temperature applications, has induced new challenges in evaluating their mechanical properties. The effects of temperature on the shear performance of 3-dimensional orthogonal and 2-dimensional plain woven composites were compared in this study through double-notch shear tests. A scanning electron microscope was employed to investigate the fiber/matrix interface properties to reveal the failure characteristics. The results showed that temperature had a visible impact on the inter-laminar shear strength (ILSS), deformation modes, and failure mechanism. The ILSS decreased as temperature increased, which was caused by the degradation of the matrix properties and fiber/matrix interface properties at high temperature. A finite element model was established to analyze the transient deformation process and the damage mechanism of the 3D orthogonal woven composite. This indicated that Z-binder yarns could improve the delamination resistance of 3D orthogonal woven composites, especially under high temperatures. The changes in failure modes of the 3D orthogonal woven composites was put down to thermal softening of the epoxy resin caused by high temperature and the undulation of the yarns.

scholarly journals Surface roughness characterization of various ceramic fibers using AFM and low-voltage SEM

1994 ◽  
Vol 52 ◽  
pp. 1066-1067
Author(s):  
K. L. More ◽  
E. Lara-Curzio ◽  
R. A. Lowden
Keyword(s):  
Surface Roughness ◽  
Low Voltage ◽  
Interfacial Shear Stress ◽  
Fiber Surface ◽  
Interfacial Properties ◽  
Matrix Interface ◽  
Ceramic Fibers ◽  
Pull Out ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

The effect of interfacial properties in fiber-reinforced ceramic matrix composites is critical to the overall mechanical behavior of the composite material. The creation of a relatively weak fiber/matrix interface allows for the beneficial actions of debonding and fiber pull-out to occur, thus improving the fracture toughness and, in many cases, the ultimate strength of the composite. To date, the best room temperature interfacial properties have been achieved by coating the fibers with either carbon or boron nitride. There are several factors which contribute to the interfacial properties of a composite, including the residual stress (clamping stress) present at the fiber/matrix interface, which is a result of differences in thermal expansion, and the fiber surface roughness. In this study, the surfaces of several ceramic fibers have been characterized qualitatively using a Hitachi S-4500 FEG SEM operated at low voltages and quantitatively using a Topometrix atomic force microscope (AFM). This study is part of an overall program relating fiber surface roughness to the interfacial shear stress.

Effect of Fiber Treatment on Fiber Strength and Fiber/Matrix Interface of Hemp Reinforced Polypropylene Composites

2010 ◽  
Vol 112 ◽  
pp. 1-8 ◽  
Author(s):  
Sofien Bouzouita ◽  
Michelle Salvia ◽  
Hachmi Ben Daly ◽  
A. Dogui ◽  
E. Forest
Keyword(s):  
Load Transfer ◽  
Fiber Strength ◽  
Natural Fibers ◽  
Interfacial Properties ◽  
Impregnation Method ◽  
Interface Properties ◽  
Matrix Interface ◽  
Hemp Fiber ◽  
Hemp Fibers ◽  
Fiber Matrix

The use of natural fibers as reinforcement in composites is emerging. Several studies are underway to improve the mechanical characteristics of these fibers and its matrix interface properties for better load transfer. However, the treatments generally used are relatively expensive and complicated to apply. This work deals with the effect of new Fibroline process on tensile and interfacial properties of hemp fiber reinforced in polypropylene. Fibroline is a dry powder impregnation method which consists of submitting fibers and polymer powder under strong alternating electric field. Morphology and tensile properties of hemp fibers after different surface treatments (raw, dried, raw and Fibroline-treated, dried and Fibroline-treated) are evaluated. Interface properties of treated hemp fibers on polypropylene matrix are then characterized by fragmentation test of monofilament composites. Results showed the Fibroline treatment reduces the fiber mechanical properties but improves the load transfer efficiency due to random generation of surface cracks and better fiber/matrix adherence, respectively. For the case of dried and Fibroline-treated hemp fibers, large decrease in mechanical and interfacial properties was observed.

scholarly journals Toughening Behavior and Interfacial Properties of Fiber-Reinforced Ceramic Composites

1991 ◽  
Vol 113 (3) ◽  
pp. 197-203
Author(s):  
C. H. Hsueh
Keyword(s):  
Critical Role ◽  
Stress Transfer ◽  
Interfacial Properties ◽  
Ceramic Composites ◽  
Matrix Interface ◽  
Fiber Bridging ◽  
The Matrix ◽  
Fiber Matrix Interface ◽  
New Generation

Toughening of ceramics by incorporating strong fibers has become an established technology, resulting in the creation of a new generation of tough ceramic composites. This toughening effect is primarily due to bridging of the crack surfaces by intact fibers when the composite is subjected to tension. The fiber bridging mechanisms, which are contingent upon the stress transfer phenomena between the fiber and the matrix, are reviewed in this paper. The critical role of the properties at the fiber/matrix interface in controlling the stress transfer phenomena is examined. Finally, evaluations of the interfacial properties of the composite by the indentation technique and the corresponding analysis are presented.

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