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Standard Test Method for Facing Properties of Sandwich Constructions by Long Beam Flexure (Includes all amendments And changes 7/14/2016).
Automaticky preložený názov:
Štandardná skúšobná metóda pre Tvárou v tvár vlastnosti sendvičových konštrukcií Long Beam ohyb
NORMA vydaná dňa 1.8.2012
Označenie normy: ASTM D7249/D7249M-12e1
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.8.2012
Kód tovaru: NS-37988
Počet strán: 9
Približná hmotnosť: 27 g (0.06 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
bending stress, facing modulus, facing stress, facing strength, flexural stiffness, sandwich construction, sandwich deflection, ICS Number Code 79.060.01 (Wood-based panels in general)
Significance and Use | ||||||||||||||||||||
5.1 Flexure tests on flat sandwich construction may be conducted to determine the sandwich flexural stiffness, the core shear strength, and shear modulus, or the facings’ compressive and tensile strengths. Tests to evaluate core shear strength may also be used to evaluate core-to-facing bonds. 5.2 This test method is limited to obtaining the strength and stiffness of the sandwich panel facings, and to obtaining load-deflection data for use in calculating sandwich beam flexural and shear stiffness using Standard Practice D7250/D7250M. Due to the curvature of the flexural test specimen when loaded, facesheet compression strength from this test may not be equivalent to the facesheet compression strength of sandwich structures subjected to pure edgewise (in-plane) compression. 5.3 Core shear strength and shear modulus are best determined in accordance with Test Method C273 provided bare core material is available. Test Method C393 may also be used to determine core shear strength. Standard Practice D7250/D7250M may be used to calculate the flexural and shear stiffness of sandwich beams. 5.4 This test method can be used to produce facing strength data for structural design allowables, material specifications, and research and development applications; it may also be used as a quality control test for bonded sandwich panels. 5.5 Factors that influence the facing strength and shall therefore be reported include the following: facing material, core material, adhesive material, methods of material fabrication, facing stacking sequence and overall thickness, core geometry (cell size), core density, adhesive thickness, specimen geometry, specimen preparation, specimen conditioning, environment of testing, specimen alignment, loading procedure, speed of testing, facing void content, adhesive void content, and facing volume percent reinforcement. Further, facing strength may be different between precured/bonded and co-cured facesheets of the same material. 1.1 This test method covers
determination of facing properties of flat sandwich constructions
subjected to flexure in such a manner that the applied moments
produce curvature of the sandwich facing planes and result in
compressive and tensile forces in the facings. Permissible core
material forms include those with continuous bonding surfaces (such
as balsa wood and foams) as well as those with discontinuous
bonding surfaces (such as honeycomb).
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.2.1 Within the text, the inch-pound units are shown in brackets. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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