Local Stress Distribution in the Vicinity of Loading Points in Flexural Test of Orthotropic Beams

[+] Author and Article Information
H. Yoshida, T. Ogasa

Industrial Products Research Institute, Tsukuba, Japan

M. Uemura

Department of Engineering, College of Industry and Technology, Nihon University, Narashino, Japan

J. Energy Resour. Technol 113(4), 230-234 (Dec 01, 1991) (5 pages) doi:10.1115/1.2905905 History: Received October 01, 1989; Revised June 23, 1991; Online April 16, 2008


The two-dimensional stress distributions in orthotopic composite beam under 4-point flexure are analyzed by replacing the concentrated load by distributing pressure in the vicinity of loading nose and by expanding the stress function for compatability equation in terms of Fourier series. The validity of analytical results is verified experimentally by using the photoelastic film-coating technique on unidirectional reinforced plastics. It is shown that the local stress distributions around the loading points are complicated and are very different from those predicted by elementary beam theory; and hence, the reliability of flexural strength and interlaminar shear strength defined by elementary beam theory are in question. It is suggested that the 4-point flexure is reasonable and recommendable as a standard testing method compared with the 3-point flexural one.

Copyright © 1991 by The American Society of Mechanical Engineers
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