1. Scope

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 C 393/C 393M and/or D 7249/D 7249M.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

C273 Test Method for Shear Properties of Sandwich Core Materials

C274 Terminology of Structural Sandwich Constructions

C393/C393M Test Method for Core Shear Properties of Sandwich Constructions by Beam Flexure

D883 Terminology Relating to Plastics

D3878 Terminology for Composite Materials

D7249/D7249M Test Method for Facing Properties of Sandwich Constructions by Long Beam Flexure

E6 Terminology Relating to Methods of Mechanical Testing

E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process

E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

E456 Terminology Relating to Quality and Statistics

E1309 Guide for Identification of Fiber-Reinforced Polymer-Matrix Composite Materials in Databases

E1434 Guide for Recording Mechanical Test Data of Fiber-Reinforced Composite Materials in Databases

Keywords

core shear modulus; flexural stiffness; sandwich construction; sandwich deflection; shear rigidity; shear stiffness; Flexural stiffness; Sandwich beam test

ICS Code

ICS Number Code 79.060.01 (Wood-based panels in general)

DOI: 10.1520/D7250_D7250M-06

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