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Structural Engineering and Mechanics Volume 87, Number 6, September25 2023 , pages 529-540 DOI: https://doi.org/10.12989/sem.2023.87.6.529 |
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Dynamic response of a laminated hybrid composite cantilever beam with multiple cracks & moving mass |
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Saritprava Sahoo, Sarada Prasad Parida and Pankaj Charan Jena
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| Abstract | ||
| A novel laminated-hybrid-composite-beam (LHCB) of glass-epoxy infused with flyash and graphene is constructed for this study. The conventional mixture-rule and constitutive-relationship are modified to incorporate filler and lamina orientation. Eringen's non-local-theory is used to include the filler effect. Hamilton's principle based on fifth-order-layer-wiseshear-deformation-theory is applied to formulate the equation of motion. The analogous shear-spring-models for LHCB with multiple-cracks are employed in finite-element-analysis (FEA). Modal-experimentations are conducted (B&K-analyser) and the findings are compared with theoretical and FEA results. In terms of dimensionless relative-natural-frequencies (RNF), the dynamic-response in cantilevered support is investigated for various relative-crack-severities (RCSs) and relative-crackpositions (RCPs). The increase of RCS increases local-flexibility in LHCB thus reductions in RNFs are observed. RCP is found to play an important role, cracks present near the end-support cause an abrupt drop in RNFs. Further, multiple cracks are observed to enhance the nonlinearity of LHCB strength. Introduction of the first to third crack in an intact LHCB results drop of RNFs by 8%, 10%, and 11.5% correspondingly. Also, it is demonstrated that the RNF varies because of the lamina-orientation, and filler addition. For 0o lamina-orientation the RNF is maximum. Similarly, it is studied that the addition of graphene reduces weight and increases the stiffness of LHCB in contrast to the addition of flyash. Additionally, the response of LHCB to moving mass is accessed by appropriately modifying the numerical programs, and it is noted that the successive introduction of the first to ninth crack results in an approximately 40% to 120% increase in the dynamic-amplitude-ratio. | ||
| Key Words | ||
| dynamics; Eringen's non-local theory; fillers; graphene and flyash; Hamilton's principle; hybrid-composite beam; moving mass; multiple1-transverse-cracks | ||
| Address | ||
| Saritprava Sahoo, Pankaj Charan Jena: Department of Production Engineering, Veer Surendra Sai University of Technology, Burla, Odisha, 768018, India Sarada Prasad Parida: Department of Mechanical Engineering, Templecity Institute of Technology, Khordha, Odisha, 752050, India | ||