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RESEARCH PAPERS

Electron Beam Moiré Study of Fracture of a Glass Fiber Reinforced Plastic Composite

[+] Author and Article Information
D. T. Read

Materials Reliability Division, National Institute of Standards and Technology, Boulder, CO 80303

J. W. Dally

Mechanical Engineering Department, University of Maryland, College Park, MD 20742

J. Appl. Mech. 61(2), 402-409 (Jun 01, 1994) (8 pages) doi:10.1115/1.2901458 History: Received October 01, 1992; Revised February 23, 1993; Online March 31, 2008

Abstract

Using the method of electron beam moiré, a small region at an interface of a [O2 / 90]s glass fiber reinforced plastic composite has been examined during tensile testing. The tensile test was conducted inside a scanning electron microscope, with a high spatial frequency line grating (10,000 lines/mm) at the interface between a longitudinal ply and a transverse ply. During the test, this region was observed at a magnification of 1900 × . Local strain measurements were made by interpreting the moiré fringe patterns over gage lengths that varied from 10 to 30 μm. The magnitude and distribution of the local strains depended on the damage that occurred with monotonically increasing load. Load shedding by the transverse ply was evident from the fringe patterns. Extremely high local strains were observed: longitudinal fiber strains up to three percent, normal strains up to three percent, and shear strains up to 40 percent in the epoxy matrix.

Copyright © 1994 by The American Society of Mechanical Engineers
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