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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/754

Title: Quasi-static and dynamic axial compression of glass/polyester composite hemi-spherical shells
Authors: Gupta, N K
Prasad, G L Easwara
Keywords: collapse mechanisms
energy absorption capacities
glass / polyster composite hemispherical shells
quassi-static tests
deformation
crushing
fracture
load-deformation
energy-compression curves
Issue Date: 1999
Citation: International Journal of Impact Engineering, 22(8), 757-774
Abstract: An experimental investigation has been carried out to study the collapse mechanisms and the energy absorption capacities of the glass/polyester composite hemi-spherical shells under both quasi-static and drop hammer loading. The shells were made of randomly oriented glass "bre mats and polyester resin. Quasistatic tests were conducted at speed of 2 mm/min. and the impact velocities varied from 5 to 9 m/s. The radii of the shells varied from 53.5 to 106.1 mm and their thicknesses from 1.10 to 2.84 mm. Infiuence of these variables on the mechanism of deformation has been discussed. Experiments on 45 shells showed that their progressive crushing occurred due to the formation of successive zones of fracture. Based on these observations an analytical model has been developed for the prediction of load-deformation and energy-compression curves. The results thus obtained are found to match well with the experiments. It is seen that the ratio of the mean collapse loads recorded in impact and quasi-static tests for a given shell is greater than one but it decreases with the increase in thickness of the shell.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/754
Appears in Collections:Applied Mechanics

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