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Abstract

Dynamic mechanical properties of cyanate modified epoxy/glass fiber composites are investigated under varied temperatures. The tensile strength increased with an increase in cyanate content (EP, 20EPCY, 40EPCY and 60EPCY) from 320 MPa to 401 MPa. The fracture toughness values also increased from 0.7671 kJ/m², for neat epoxy resin to 0.9315 kJ/m² for 60% cyanate ester modified epoxy system. Free vibration method is used to experimentally measure frequency response. Natural frequency of 20EPCY, 40EPCY and 60EPCY increase by 1.2 times, 1.5 times and 1.74 times respectively at 150^°C when compared to neat EP system. The damping properties, in terms of the damping factor and dynamic tensile modulus are determined theoretically. The increase in tensile modulus of cyanate modified epoxy system with increase in cyanate loading is 3.8 GPa(EP) to 5.3 GPa(60EPCY) at 30^°C and 2.75 GPa(EP) to 4.36 GPa(60EPCY) at 150^°C. The neat epoxy system has a damping factor of 0.01326 and 0.01668 at 30^°C and 150^°C. The damping factors of 20EPCY, 40EPCY and 60EPCY systems at 150^° C are found to increase by 1.1times, 1.2 times and 1.4 times respectively when compared with EP system.

Keywords

Composite damping frequency tensile strength vibration

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Dynamic mechanical properties of epoxy cyanate matrix composite under varied temperatures by free vibration method

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