The Influence of Aspect Ratio of Reinforcing Fibers on Mechanical Properties of Gypsum Matrix Composite Panels
نویسندگان
چکیده
INTRODUCTION Composites have become an important group of engineering materials, as they offer better physical and mechanical properties in comparison to unreinforced materials. Different types of materials can be used as the matrix of composites, including metals, polymers and ceramics. An important aspect of researches on composites has been the investigation of their mechanical properties [1]. One of the most important parameters affecting the properties of the composites is the shape and distribution of the reinforcement throughout the matrix. It has been proven that composites reinforced with continuous fibers, in spite of the high price of the production of fibers, exhibit better properties than the ones reinforced with discontinuous reinforcements. The shape of the reinforcements is determined by their aspect ratio, which is defined as the ratio between the length and the diameter of the reinforcements. Fibers have the highest aspect ratio among different types of reinforcements. High-performance composite applications require reinforcement by fibrous materials with outstanding mechanical properties. Especially, polymeric fibers, such as poly (p-phenylene terephthalamide) (that is, Kevlar fibers) are well suited to highperformance composite applications, because they combine a high specific strength and modulus with a high thermal resistance and chemical inertness, and moreover, they exhibit low electrical conductivity compared with metallic or carbon fibers [2]. In this study, the effect of the size of Kevlar reinforcing fibers on the mechanical properties of gypsum matrix composite panels has been investigated.
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