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Standard Test Method for Shear Fatigue of Sandwich Core Materials
Automaticky přeložený název:
Standardní zkušební metoda pro smykové Únava sendvičových materiálů jádra
NORMA vydána dne 1.10.2013
Označení normy: ASTM C394/C394M-13
Poznámka: NEPLATNÁ
Datum vydání normy: 1.10.2013
Kód zboží: NS-13225
Počet stran: 6
Přibližná hmotnost: 18 g (0.04 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
fatigue, sandwich core, shear strength, shear stress, ICS Number Code 83.120 (Reinforced plastics)
Significance and Use | ||||||||||||||||||||||||||
5.1 Often the most critical stress to which a sandwich panel core is subjected is shear. The effect of repeated shear stresses on the core material can be very important, particularly in terms of durability under various environmental conditions. 5.2 This test method provides a standard method of obtaining the sandwich core shear fatigue response. Uses include screening candidate core materials for a specific application, developing a design-specific core shear cyclic stress limit, and core material research and development. 5.3 Factors that influence core
fatigue response and shall therefore be reported include the
following: core material, core geometry (density, cell size,
orientation, etc.), specimen geometry and associated measurement
accuracy, specimen preparation, specimen conditioning, environment
of testing, specimen alignment, loading procedure, loading
frequency, force (stress) ratio and speed of testing (for residual
strength tests).
1.1 This test method determines the
effect of repeated shear forces on core material used in sandwich
panels. 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 This test method is limited to test specimens subjected to constant amplitude uniaxial loading, where the machine is controlled so that the test specimen is subjected to repetitive constant amplitude force (stress) cycles. Either shear stress or applied force may be used as a constant amplitude fatigue variable. 1.3 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. Within the text, the inch-pound units are shown in brackets. 1.4 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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2. Referenced Documents | ||||||||||||||||||||||||||
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