Postcuring effects on impact behavior of glass/epoxy composite laminates

Rahul Kumar, C and Radhakrishna, K and Rao, RMVGK (2005) Postcuring effects on impact behavior of glass/epoxy composite laminates. Journal of Reinforced Plastics and Composites, 24 (9). pp. 949-960. ISSN 0731-6844

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Studies had been undertaken on the effects of different postcure schedules on the impact resistance of RT-cured glass/epoxy laminates, subjected to repeated drop tests using an in-house built uninstrumented drop weight impact tester. The impact resistance was assessed in terms of two parameters, viz, the number of drops to failure (Nf) and the delamination area growth (dA). The specimens were postcured at different time-temperarure combinations and the impact response was studied at three different incident energy levels (10.6, 12.6, and 14.8 J). It was found that, the Nf and dA values increased to a maximum at an optimum postcure schedule of 85degC/4h. The extent of composite cure for the different postcure schedules was ascertained by measuring the glass transition temperatures (Tg), in order to obtain an appreciation for correlation between the impact resistance and the chemical cure status of the composite. Also, single drop impact studies were made at the 25-J energy level using an instrumented impact tester (DYNATUP 8250) and the aforesaid optimum postcure schedule was reconfirmed.

Item Type: Article
Uncontrolled Keywords: Glass/epoxy composite, Postcure, Impact behavior, Glass transition temperature
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
Depositing User: Smt Bhagya Rekha KA
Date Deposited: 02 Jan 2012 05:58
Last Modified: 02 Jan 2012 05:58

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