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TECHNICAL BRIEFS

How Long Should Be a Beam Specimen in Bending Tests?

[+] Author and Article Information
E. Suhir

AT&T Bell Laboratories, Murray Hill, N. J. 07974

J. Electron. Packag 112(1), 83-85 (Mar 01, 1990) (3 pages) doi:10.1115/1.2904347 History: Received December 27, 1989; Online April 28, 2008

Abstract

We assess the effect of shear on the deflections of beam specimens in three-point and four-point bending tests. The analysis is based on an analytical stress model using energy considerations. Numerical examples are carried out for polymeric specimens and for glass gel specimens. It is concluded that shear may not be considered in three-point bending tests if the length-to-height (or the length-to-diameter) ratio is greater than, say, 12. In the case of four-point bending it is also important that the distance between the external forces applied in the beam’s span be significantly smaller than the specimen’s length. It is recommended that this distance does not exceed half the specimen’s length.

Copyright © 1990 by The American Society of Mechanical Engineers
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