Impactor Mass effects in polymer Matrix Composites under Low Velocity Conditions: A Repeated Drops Test Approach

Sugun, BS and Rao, RMVGK (2009) Impactor Mass effects in polymer Matrix Composites under Low Velocity Conditions: A Repeated Drops Test Approach. lnternational Journal of Mechanical Engineering and Materials Sciences, 2(1) June 2009.

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This paper utilizes the concept of repeated drop tests to understand impactor mass effects under low velocity test conditions on Polymer Matrix Composites. Twill woven glass fabric reinforcements and epoxy matrices(three variants) with differing cure schedules were used to prepare composite specimens. These specimens were then subjected to Repeated Drop Tests using an instrumented Impact test facility. Judicious combinations of Mass and Height were used to simulate equivalent incident energies (E in) ranging from 3 J to 15J. Number of Drops to failure data (N,) was obtained for the varied impactor mass in each case. Ein - Nf plots and the Threshold Incident Energy (E*J values obtained from the overlay of these plots. showed. clear demarcable failures at lower incident energies, i.e., the specimen impacted with heavier impactor failed in less number of drops as compared to the specimen impacted with lighter mass for the same E,n. Also, E*!" obtained, clearly identified the point below which impactor mass effected earlier damage in composites. The hallmark conclusion that has been inferred from this research work is that "It is preferable to use lighter tools during routine service and overhauling of aircraft/ similar structures, so that they inflict minimum impact damage during work execution1 accidental drops".

Item Type: Article
Uncontrolled Keywords: Repeated Drop Tests;Polymer Matrix Composites;Impactor Mass effects;Threshold incident Energy;service and overhauling of aircraft structures
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
ENGINEERING > Mechanical Engineering
Depositing User: Mr Nisanth
Date Deposited: 09 Aug 2011 06:00
Last Modified: 09 Aug 2011 06:00

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