Low-velocity Impact Characterization of Glass, Carbon and Kevlar Composites Using Repeated Drop Tests

Sugun, BS and Rao, RMVGK (2004) Low-velocity Impact Characterization of Glass, Carbon and Kevlar Composites Using Repeated Drop Tests. Journal of Reinforced Plastics and Composites, 23 (15). pp. 1583-1599. ISSN 0731-6844

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Abstract

Low-velocity ( 1.2-2.4 m/s) repeated drop weight impact tests were carried out on advanced composites (glass, carbon, kevlar in epoxy matrix - LY 556, HT 972) using an instrumented impact test machine (DYNATUP 8250). The incident energies ranged from 3.5 to 15 J (constant impactor mass 5.42 kg). Number of drops to failure (Nf) data were obtained for the above with simultaneous recording of the load-time and energy-time traces. The extent of impact damage for glass and kevlar composites was interpreted using final delamination area maps (tracings). Results for all the three composites showed that with an increase in drop numbers, the peak load (PL) steadily decreased while the total energy (Et) increased, until failure. Also, as the incident energy (Ein) was varied in arithmetic progression, the number of drops to failure (Nf) varied in harmonic progression. Finally it was concluded that repeated drop tests with final delamination area maps assist in understanding the impact damage tolerance of polymer composites

Item Type: Journal Article
Uncontrolled Keywords: Aromatic polyamides;Epoxy matrix composites;Glass-epoxy composites;Carbon-epoxy composites;Impact tests;Failure modes; Impact strength;Mechanical properties;Impact damage;Delaminating;Impact velocity;Harmonic analysis; Drop weight tests
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
Division/Department: Fibre Reinforced Plastics Division, Fibre Reinforced Plastics Division
Depositing User: Ms Indrani V
Date Deposited: 23 Jan 2006
Last Modified: 04 Aug 2011 10:55
URI: http://nal-ir.nal.res.in/id/eprint/925

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