ASTM D7249/D7249M-18,Standard Test Method for Facesheet Properties of Sandwich Constructions by Long Beam Flexure.
ASTM D7249/D7249M-18 has been SUPERSEDED by ASTM D7249/D7249M-20.
ASTM D7249/D7249M-18 covers determination of facesheet properties of flat sandwich constructions subjected to flexure in such a manner that the applied moments produce curvature of the sandwich facesheet planes and result in compressive and tensile forces in the facesheets.
ASTM D7249/D7249M-18 consists of subjecting a long beam of sandwich construction to a bending moment normal to the plane of the sandwich, using a 4-point loading fixture. Deflection and strain versus force measurements are recorded.
The only acceptable failure modes for sandwich facesheet strength are those which are internal to one of the facesheets. Failure of the sandwich core or the core-to-facesheet bond preceding failure of one of the facesheets is not an acceptable failure mode. Careful post-test inspection of the specimen is required as facesheet failure occurring in proximity to the loading points can be caused by local throughthickness compression or shear failure of the core that precedes failure of the facesheet.
ASTM D7249/D7249M-18 pdf
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