ASTM D7956/D7956M-16
Standard Practice for Compressive Testing of Thin Damaged Laminates Using a Sandwich Long Beam Flexure Specimen

Standard No.

ASTM D7956/D7956M-16

Release Date

2016

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D7956/D7956M-16

Scope

5.1 This practice provides a standard method of testing damaged composite laminates which are too thin to be tested using typical anti-buckling fixtures, such as

1.1 This practice covers an approach for compressive testing thin damaged multidirectional polymer matrix composite laminates reinforced by high-modulus fibers using a sandwich long beam flexure specimen. It provides a test configuration in which the core does not constrain any protruding back side damage. It is limited to testing of monolithic solid laminates which are too thin to be tested using typical anti-buckling fixtures. It does not cover compressive testing of damaged sandwich panel facings. The composite material forms are limited to continuous-fiber or discontinuous-fiber (tape or fabric, or both) reinforced composites in which the laminate is balanced and symmetric with respect to the test direction

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.

ASTM D7956/D7956M-16 Referenced Document

• ASTM D3410 
• ASTM D3878 Standard Terminology Composite Materials
• 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
• 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 D7137/D7137M Standard Test Method for Compressive Residual Strength Properties of Damaged Polymer Matrix Composite Plates
• ASTM D7249/D7249M Standard Test Method for Facesheet Properties of Sandwich Constructions by Long Beam Flexure
• ASTM D883 Standard Terminology Relating to Plastics
• 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 E456 Standard Terminology for Relating to Quality and Statistics
• ASTM E6 Standard Terminology Relating to Methods of Mechanical Testing

ASTM D7956/D7956M-16 history

• 2016 ASTM D7956/D7956M-16 Standard Practice for Compressive Testing of Thin Damaged Laminates Using a Sandwich Long Beam Flexure Specimen
• 2014 ASTM D7956/D7956M-14 Standard Practice for Compressive Testing of Thin Damaged Laminates Using a Sandwich Long Beam Fixture Specimen