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TWO-RAIL SHEAR TEST
FIXTURE (ASTM D 4255)
Partially Assembled Fixture, with
Specimen in Place but The Two-Rail Shear Test Method and associated fixture is described as Method A in ASTM Standard D 4255 (Reference 1). It became an ASTM standard in 1983. The specimen is 6" long and 3" wide, and of the desired thickness. The six large holes in the installation jig provide clearance for the fasteners that clamp each pair of side rails to the specimen. The specimen gripping surfaces of the side rails are thermal-sprayed with tungsten carbide particles. A spacer bar is provided to maintain the proper ½” spacing between the top rail halves during final assembly. This spacer is then removed. The fixture end fittings are 1.25" diameter smooth male studs with a 0.50" diameter retaining pin cross-hole in each, to connect directly to the crosshead and base of the testing machine, or to optional adapters. The assembled fixture is then loaded in tension.
Additional
discussion of this test method can be found in References 2 through
4. 1) 1) ASTM Standard D 4255-01 (2001), "Guide for Testing In-Plane Shear Properties of Composite Laminates," American Society for Testing and Materials, West Conshohocken, Pennsylvania (first published in 1983). 2) D.F. Adams and E.Q. Lewis, "Current Status of Composite Material Shear Test Methods," SAMPE Journal, Vol. 31, No. 1, January/ February 1995, pp. 32-41. 3) 3) A.K. Hussain and D.F. Adams, "The Wyoming-Modified Two-Rail Shear Test Fixture for Composite Materials, Journal of Composites Technology and Research, Vol. 21, No. 4, October 1999, pp. 215-223. 4) 4) D.F. Adams and E.Q. Lewis, "Experimental Assessment of Four Composite Material Shear Test Methods," Journal of Testing and Evaluation, Vol. 25, No. 2, March 1997, pp. 182-189. Top of Page | Home Page | General Info | Company Profile | Product Index | Copyright 2005 - Wyoming Test Fixtures, Inc.
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