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ASTM D7250/D7250M-16
Standard Practice for Determining Sandwich Beam Flexural and Shear Stiffness
Automaticky preložený názov:
Bežná prax pre stanovenie Sandwich nosníka v ohybe a šmyku Tuhosť
NORMA vydaná dňa 1.4.2016
Informácie o norme:
Označenie normy: ASTM D7250/D7250M-16
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.4.2016
Kód tovaru: NS-635782
Počet strán: 7
Približná hmotnosť: 21 g (0.05 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D7250/D7250M-16 :
Keywords:
core shear modulus, flexural stiffness, sandwich construction, sandwich deflection, shear rigidity, shear stiffness,, ICS Number Code 79.060.01 (Wood-based panels in general)
Doplňujúce informácie
| Significance and Use | ||||||||||||||||||
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5.1 Flexure tests on flat sandwich constructions 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 practice provides a standard method of determining sandwich flexural and shear stiffness and core shear modulus using calculations involving measured deflections of sandwich flexure specimens. Tests can be conducted on short specimens and on long specimens (or on one specimen loaded in two ways), and the flexural stiffness, shear rigidity and core shear modulus can be determined by simultaneous solution of the complete deflection equations for each span or each loading. If the facing modulus values are known, a short span beam can be tested and the calculated bending deflection subtracted from the beam's total deflection. This gives the shear deflection from which the transverse shear modulus can be determined. Note 1: Core shear strength and shear modulus are best
determined in accordance with Test Method C273 provided bare core material is
available.
Note 2: For cores with high shear modulus, the shear
deflection will be quite small and ordinary errors in deflection
measurements will cause considerable variations in the calculated
shear modulus.
Note 3: To insure that simple sandwich beam theory is valid, a
good rule of thumb for a four-point bending test is the span length
divided by the sandwich thickness should be greater than 20
(1.1 This practice covers determination of
the flexural and transverse shear stiffness properties of flat
sandwich constructions subjected to flexure in such a manner that
the applied moments produce curvature of the sandwich facing
planes. 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).
The calculation methods in this practice are limited to sandwich
beams exhibiting linear force-deflection response. This practice
uses test results obtained from Test Methods C393/C393M and/or D7249/D7249M.
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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| 2. Referenced Documents | ||||||||||||||||||
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