ASTM D7264/D7264M-06 - 1.11.2006
 
1. Scope

1.1 This test method determines the flexural stiffness and strength properties of polymer matrix composites.

1.1.1 Procedure AA three-point loading system utilizing center loading on a simply supported beam.

1.1.2 Procedure BA four-point loading system utilizing two load points equally spaced from their adjacent support points, with a distance between load points of one-half of the support span.

Note 1

Unlike Test Method D 6272, which allows loading at both one-third and one-half of the support span, in order to standardize geometry and simplify calculations this standard permits loading at only one-half the support span.

1.2 For comparison purposes, tests may be conducted according to either test procedure, provided that the same procedure is used for all tests, since the two procedures generally give slightly different property values.

1.3 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

D3878-26

Standard Terminology for Composite Materials

D2344/D2344M-22

Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates

E1434-00

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

ANSI Y14.5-1999

Dimensioning and Tolerancing--Includes Inch and Metric Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.

ANSI B46.1-1995

Surface Texture (Surface Roughness, Waviness and Lay)

D5229/D5229M-20

Standard Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials

D5687/D5687M-20

Standard Guide for Preparation of Flat Composite Panels with Processing Guidelines for Specimen Preparation

D6272-25

Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by Four-Point Bending

D6856-03

Standard Guide for Testing Fabric-Reinforced ""Textile"" Composite Materials

E4-24

Standard Practices for Force Calibration and Verification of Testing Machines

E6-25

Standard Terminology Relating to Methods of Mechanical Testing

E18-25

Standard Test Methods for Rockwell Hardness of Metallic Materials

E122-17(2022)

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

E177-26a

Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods (Includes all amendments and changes 5/14/2026).

E456-13a(2022)e1

Standard Terminology Relating to Quality and Statistics (Includes all amendments and changes 4/16/2024).

D790-25

Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials

E1309-00

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