ASTM D7766/D7766M-23
Standard Practice for Damage Resistance Testing of Sandwich Constructions

Standard No.

ASTM D7766/D7766M-23

Release Date

2023

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D7766/D7766M-23

Scope

1.1 This practice provides instructions for modifying laminate quasi-static indentation and drop-weight impact test methods to determine damage resistance properties of sandwich constructions. 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, truss cores and fiber-reinforced cores). 1.2 This practice supplements Test Methods D6264/ D6264M (for quasi-static indentation testing) and D7136/ D7136M (for drop-weight impact testing) with provisions for testing sandwich specimens. Several important test specimen parameters (for example, facing thickness, core thickness and core density) are not mandated by this practice; however, repeatable results require that these parameters be specified and reported. 1.3 Three test procedures are provided. Procedures A and B correspond to D6264/D6264M test procedures for rigidlybacked and edge-supported test conditions, respectively. Procedure C corresponds to D7136/D7136M test procedures. All three procedures are suitable for imparting damage to a sandwich specimen in preparation for subsequent damage tolerance testing in accordance with Test Method D8287/ D8287M (compressive loading) and Practice D8388/D8388M (flexural loading). 1.4 In general, Procedure A is considered to be the most suitable procedure for comparative damage resistance assessments, due to reduced influence of flexural stiffness and support fixture characteristics upon damage formation. However, the selection of a test procedure and associated support conditions should be done in consideration of the intended structural application, and as such Procedures B and C may be more appropriate for comparative purposes for some applications. 1.5 Units—The values stated in either SI units or inchpound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.5.1 Within the text the inch-pound units are shown in brackets. 1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D7766/D7766M-23 Referenced Document

• ASTM D3171 Standard Test Methods for Constituent Content of Composite Materials
• ASTM D3878 Standard Terminology Composite Materials
• ASTM D5229/D5229M Standard Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials
• ASTM D5687/D5687M Standard Guide for Preparation of Flat Composite Panels with Processing Guidelines for Specimen Preparation
• ASTM D6264/D6264M Standard Test Method for Measuring the Damage Resistance of a Fiber-Reinforced Polymer-Matrix Composite to a Concentrated Quasi-Static Indentation Force*， 2023-05-18 Update
• ASTM D7136/D7136M Standard Test Method for Measuring the Damage Resistance of a Fiber-Reinforced Polymer Matrix Composite to a Drop-Weight Impact Event
• ASTM D792 Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
• ASTM D8287/D8287M Standard Test Method for Compressive Residual Strength Properties of Damaged Sandwich Composite Panels
• ASTM D8388/D8388M Standard Practice for Flexural Residual Strength Testing of Damaged Sandwich Constructions
• ASTM D883 Standard Terminology Relating to Plastics*， 2024-02-01 Update
• ASTM E122 Standard Practice for Calculating Sample Size to Estimate, With a Specified Tolerable Error, the Average for Characteristic of a Lot or Process
• ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• ASTM E2533 Standard Guide for Nondestructive Examination of Polymer Matrix Composites Used in Aerospace Applications
• ASTM E456 Standard Terminology for Relating to Quality and Statistics
• ASTM E6 Standard Terminology Relating to Methods of Mechanical Testing

ASTM D7766/D7766M-23 history

• 2023 ASTM D7766/D7766M-23 Standard Practice for Damage Resistance Testing of Sandwich Constructions
• 2016 ASTM D7766/D7766M-16 Standard Practice for Damage Resistance Testing of Sandwich Constructions
• 2011 ASTM D7766/D7766M-11 Standard Practice for Damage Resistance Testing of Sandwich Constructions