SEDL / STP / STP1206-EB / STP12620S

Composite Material Shear Property Measurement Using the Iosipescu Specimen

Ho, H
Visiting assistant professor, graduate research assistant, research associate, and professor, Virginia Polytechnic Institute and State University, Blacksburg, VA
Composite Materials and Structures Center, Michigan State University, East Lansing, MI

Budiman, HT
Visiting assistant professor, graduate research assistant, research associate, and professor, Virginia Polytechnic Institute and State University, Blacksburg, VA
Ph.D. student, MIT, Cambridge, MA

Tsai, MY
Visiting assistant professor, graduate research assistant, research associate, and professor, Virginia Polytechnic Institute and State University, Blacksburg, VA

Morton, J
Visiting assistant professor, graduate research assistant, research associate, and professor, Virginia Polytechnic Institute and State University, Blacksburg, VA

Farley, GL
Research scientist, U.S. Army Aerostructures Directorate, NASA Langley Research Center, Hampton, VA

Pages: 20    Published: Jan 1993

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Abstract

A detailed evaluation of the suitability of the Iosipescu specimen, tested in the modified Wyoming fixture, for determining the in-plane shear response of a variety of composite materials is presented. Finite element analysis and moiré interferometry are used to assess the uniformity of the shear stress field in the test section of fibrous, sheet molding compound (SMC) and particulate composites, and aluminum alloy. The nonuniformity of the strain field and the sensitivity of some composite materials to the specimen/fixture contact mechanics are discussed. The shear responses for various composite material systems are discussed and procedures for reliable shear property measurements recommended.