An Improved Iosipescu Shear Test Fixture
Conant NR, Odom EM
(Received 0 0; accepted 0 0)

Abstract
A new Iosipescu shear test fixture design that can be used to perform the test procedure outlined in Test Method for Shear Properties of Composite Materials by the V-Notched Beam Method (ASTM D 5379) was designed, fabricated, and tested. The new fixture solves the often reported problems of specimen twisting, variability of results, and differences in measured shear modulus between [0]₁₆, [0/90]_4s, and [90]₁₆ laminates. Lateral instability of the Iosipescu specimen is explored as the main agent causing the undesirable effects observed with the previous fixture design.

Keywords:
front-to-back difference, graphite/epoxy composites, instability, Iosipescu fixture, Iosipescu specimen, shear modulus, shear strain, shear testing, strain gage, twisting

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Author Conant NR, Odom EM Title An Improved Iosipescu Shear Test Fixture Symposium , Committee on