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SPECIAL SANDWICH
PANEL SHEAR FIXTURE
Model
No. CU-CS (low carbon steel)
This fixture performs the same functions as Models CU-TS and WTF-TS (see Section A-7 of this catalog), while incorporating the separate tension and compression loading mode configurations indicated in ASTM Standard C 273 (Reference 1). It will be noted that the tension loading mode is essentially the same as that of the Model CU-TS and WTF-TS fixtures, but utilizing the same notched loading plates as the compression loading mode. The fixture shown above can also be supplied with just the compression loading fittings, if desired. For example, only the compression loading mode is specified in the German Standard DIN 53 294 (Reference 2). The specimen size is dictated by the thickness of the sandwich being tested, the specimen width to be not less than twice this thickness, and the length not less than 12 times this thickness, "unless otherwise agreed to." The steel plates shown in the photograph are 2" wide, 0.63" thick, and 10" long. Any other sizes can be supplied upon request. The sandwich panel or core material specimen to be tested is bonded directly to the loading plates, three pairs of which are included with the fixture. Additional pairs can be supplied, at a nominal additional cost. Perforated plates (for enhancing absorption rates during moisture conditioning), as well as plates containing fluid fittings (for pressurizing the core while applying the shear loading) can also be supplied upon request. An ASTM standard also exists for conducting shear fatigue tests of sandwich core materials (Reference 3). This standard, ASTM C 394, uses the same test fixture as the present ASTM C 273 standard. However, the core material is to be tested without face sheets. That is, the core is bonded directly to the bonding plates. Sources of Additional Information: 1) 1) ASTM Standard C 273-00 (2000), "Shear Properties in Flatwise Plane of Flat Sandwich Constructions or Sandwich Cores," American Society for Testing and Materials, West Conshohocken, PA (first issued in 1951). 2) 2) DIN Standard 53 294, "Testing of Sandwiches: Shear Test in Flatwise Plane," Deutsches Institut fur Normung, Koln, February 1982. 3) ASTM Standard C 394-00 (2000), "Shear Fatigue of Sandwich Materials," American Society for Testing and Materials, West Conshohocken, PA (first issued in 1957).
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