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ASTM D7250

Standard Practice for Determining Sandwich Beam Flexural and Shear Stiffness.
This practice covers the determination of the flexural and transverse stiffness properties of flat sandwich constructions subjected to bending in such a way that the applied moments produce curvature of the sandwich cladding planes. Permitted 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 that exhibit a linear force-strain response.

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