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RISS 인기검색어
- 검색키워드
- 저자 : T. G. Loganathan (검색결과 2 건)
- 무료
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Assessment of Cyclic Load Induced Energy Dissipation and Damping on GFRP Composite Laminate
T. G. Loganathan,K. Vinoth Kumar,R. Krishnamurthy 한국섬유공학회 2020 Fibers and polymers Vol.21 No.9
Polymeric composites exhibit load sensitive stiffness unlike the case of homogeneous metallic material. Composites are widely used in dynamic loading environment and hence it is necessary to study their response in terms ofstructural properties. Behavioural changes of glass epoxy composite laminate on exposure to cyclic loading has been assessedin terms of energy dissipation (Ed) and Damping factor (DF) by hysteresis loop. GFRP composite specimens (UD-0, 0/30/60/0, 0/45/0/-45, 0/90/90/0, and 0/90/0/90) are exposed to low velocity constant amplitude cyclic loading using a laboratoryarrangement (by an eccentric disc) at 4.6 Hz and 8.6 Hz frequencies. In fibre-reinforced composites apart from the fibrevolume fraction, the fibre interaction angle significantly influences their dynamic properties on loading. Unidirectional (UD-0) laminate exhibits low damping/energy dissipation, while 0/90/0/90 laminate with large fibre interaction angle showshighest damping/energy dissipation. Whereas, symmetric cross ply (0/90/90/0) laminate acts as a performance demarcationamong the chosen laminates. Thus, optimum Ed/DF properties of GFRP laminate in dynamic environment is attributed tosymmetric lay-up, smaller fibre orientation interaction angle in the lay-up sequence and 0 fibre layer at the boundary.
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Significance of cyclic loading parameters on the flexural response of the GFRP composites
T. G. Loganathan,R. Krishnamurthy,K. Chandrasekaran 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.7
Automotive design calls for weight reduction, considering fuel consumption and vehicle dynamics as well. Application of composite materials for suspensions and other structural members is in that direction. Owing to their high specific strength and inherent structural damping qualities, composites can be an alternative to metallic materials, especially with the suspension-springs. Further, epoxy composites can resist environmental influences, facilitating easier maintenance. In this study, we assessed the flexure response of GFRP composite exposed to pre flexure cyclic loading. This was to simulate the loading environment of an automobile leaf spring. Experiments were conducted with Taguchi’s DOE using L9 orthogonal array with two factors and three levels. The test specimens were prepared by hand lay-up technique with four layers of (0/0/0/0, 0/30/60/0, 0/90/90/0 and 0/45/0/-45) orientation. Constant peak amplitude cyclic loading was imposed on the specimen by an eccentric disc in a radial drilling machine. The flexural modulus of the cyclic loaded specimen was obtained by three point bend test as per ASTM D790. Assessment of the test results by ANOVA, S/N ratio and regression analysis indicated that the flexural modulus of the pre flexural cyclic loaded composite is significantly influenced by the loading parameters (loading cycle and frequency), and the flexural modulus can be enhanced with reduced fiber orientation interactions within the lay-up at critical operating conditions. The damage pattern influenced by fibre orientation in the lay-up sequence is ascertained by SEM images.
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