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ABSTRACT:
This study aims to evaluate the result of experimental examination conducted on free vibration characteristics and dynamic mechanical analysis over a range of temperature and five different frequencies of short glass fibre polyester composite. The effect of temperature on the storage modulus, loss modulus, and damping efficiency (tan ô) is determined. Synthetic reinforced material is created in random fibre orientation using hand lay-up method by domination of fibre length (10mm) and weight percent (5, 10, 15, 20%). Improvement in the fibre content will make a rise in the natural frequency and the storage modulus is maximum when fibre content of 20wt. % is introduced to the composite materials in the temperature ranges of 300-800°C. The peak of loss modulus and damping curves were lowered with respect to the fibre content. The properties were compared with neat polyester.
KEYWORDS:
Synthetic fibres; Polyester resin; Free vibration testing; Dynamic mechanical analysis
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1. Introduction
Synthetic composites are made from synthesized polymers or small molecules. Synthetic fibres do not depend either on an agricultural crop or animals farming. Synthetic fibre composite properties are stronger than natural composite but synthetic fibres burn more readily than natural and cost of making materials would be more. Some of the synthetic composites are carbon/graphite, boron, Kevlar and ceramic composite. These characteristics are crucial to ascertain the material performance in diversified circumstances. However, synthetic fibre reinforced composites are not fully investigated for structural engineering applications especially under dynamic loading conditions. Damping is one of the significant factors allied with the vibrant conduct of the materials because of its influence on safety and reliability [1]. Vibrations elevate high-noise levels, malfunctioning of stress exhaustion, incomplete wear and hazardous working conditions.
In the hand lay-up method, the duration of curing depends on various types of polymer resins used for composite fabrication. For example, epoxy allied system can be cured at room temperature within 24-48 hours. Primary and infrastructural concerns are very low as compared to other processes. Processing rate is less and high volume fraction of additive material is very crucial to achieve...