Abstract
A numerical study was conducted using the finite element method to determine the effects of square and rectangular cutouts on the buckling behavior of a 16-ply quasi-isotropic graphite/epoxy symmetrically laminated rectangular composite plate. The square/ rectangular cutouts were subjected to uniaxial compression loading. This study addresses the effects of the size of the square/rectangular cutout, orientation of the square/rectangular cutout, plate aspect ratio (a/b), and plate length/thickness ratio (a/t) on the buckling behavior of the symmetrically laminated rectangular composite plate under uniaxial compression loading. Buckling loads were computed for seven different quasi-isotropic laminate configurations [0°/+45°/−45°/90°]2s, [15°/+60°/−30°/−75°]2s, [30°/+75°/−15°/−60°]2s, [45°/+90°/0°/−45°]2s, [60°/−75°/+15°/−30°]2s, [75°/−60°/+30°/−15°]2s, [90°/−45°/+45/°0°]2s. Results showed that the magnitudes of the buckling loads decrease with increasing cutout positioned angle as well as c/b and d/b ratios for plates with a rectangular cutout. The symmetrically laminated quasi-isotropic [0°/+45°/−45°/90°]2s composite plate is stronger than all other symmetrically analyzed laminated quasi-isotropic composite plates. The magnitudes of the buckling loads of a rectangular composite plate with square/rectangular cutout decrease with increasing plate aspect ratio (a/b) and plate length/thickness (a/t) ratio.
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G. Krishna Mohana Rao has received his master’s degree in mechanical engineering from Indian Institute of Science, Bangalore, India and Doctoral degree from JNTU Hyderabad. He has more than 18 years of teaching experience. He has published about 45 papers in international journal papers and international conferences. He is the co-author of a book on engineering mechanics. He has visited countries like USA, UK, Singapore, Malaysia, China, Thailand, Hong Kong, Egypt, UAE, Italy, Switzerland, Austria and Greece to deliver key note addresses, to chair technical sessions and to present his technical papers. He is on the review board for many international journals. His areas of research include traditional and non-traditional machining and MEMS.
A. Lakshmi narayana was born at Jammalamadugu, A.P, India on 08-06-1979. He received his bachelor’s degree in mechanical engineering from Sri venkateswara University, AP, India in the year 2003. Later, he was awarded Masters degree in mechanical engineering from Osmania university, Hyderabad, A.P, India in the year 2006. He has been working as design engineer in Rotary Wing Research and design centre of Hindustan Aeronautics Limited, Bangalore, India, since 2007. Currently he is pursuing his doctoral program with J.N.T University, Hyderabad as an external student.
R. Vijaya kumar is working as Manager (design) in Rotary Wing Research and design centre of Hindustan Aeronautics Limited, Bangalore, India. He received his bachelor’s degree in mechanical engineering from Nagarjuna University, AP, India in the year 1996. Later, he was awarded Masters degree in mechanical engineering from Anna university, T.N, India in the year 1999. He received his doctoral degree in the mechanical engineering from Osmania university, Hyderabad, A.P, India in the year 2008. He has published 5 technical papers in international journals and conferences. Presently, he is guiding 3 research students in the area of mechanical engineering.
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Lakshmi Narayana, A., Rao, K. & Vijaya Kumar, R. FEM buckling analysis of quasi-isotropic symmetrically laminated rectangular composite plates with a square/rectangular cutout. J Mech Sci Technol 27, 1427–1435 (2013). https://doi.org/10.1007/s12206-013-0323-4
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DOI: https://doi.org/10.1007/s12206-013-0323-4