ASTM D7264 – Specimen Size

ASTM D7264 – Specimen Size

The ASTM D7264 standard is used to determine a polymer matrix composite’s flexural stiffness and strength parameters. The standard also specifies the specimen size required to carry out the test.

    ASTM D7264 – Specimen Size

    The ASTM D7264 standard describes two test procedures to determine the flexural properties of composites:

    • Procedure A: Three-point loading system using center loading on a simply supported beam.
    • Procedure B: A four-point loading system with two load points evenly spaced from their adjacent support points and one-half the support span between each load point.

    Since the two test processes typically yield slightly different property values, tests may be undertaken according to any test procedure for comparison purposes, provided that the same procedure is utilized for all tests. These processes can be utilized to determine flexural qualities that can be applied to design as well as quality control and specification needs. These processes can help evaluate a variety of environmental factors to identify which are design drivers and may call for additional testing. These techniques can also be used to assess a structure’s flexural characteristics.

    Test Specimen Preparation

    The ASTM D7264 standard support span-to-thickness ratio is designed for flexural strength so that failure occurs at the specimens’ outer surface and is only caused by the bending moment. The standard span-to-thickness ratio is 32:1, the standard specimen thickness is 4 mm (0.16 inches), and the standard specimen width is 13 mm (0.5 inches) with the specimen length extending by roughly 20% beyond the support span. The width of the specimen for fabric-reinforced textile composite materials must be at least two unit cells, as specified in Guide D6856. The support span-to-thickness ratio (32:1) and specimen width must be maintained when using an alternative specimen thickness if the standard specimen thickness cannot be attained in the given material system. If specified in the report, alternative support span-to-thickness ratios of 16:1, 20:1, 40:1, and 60:1 may also be employed. Additionally, the results of one test using one support span-to-thickness ratio and another test utilizing a different support span-to-thickness ratio cannot be compared.

    When tested at low support span-to-thickness ratios, shear deformations can dramatically diminish the apparent modulus of highly orthotropic laminates. For flexural modulus calculations, a high support span-to-thickness ratio is suggested. In rare circumstances, it can be necessary to determine modulus and strength using different sets of specimens.

    Number of Test Specimens

    Unless valid findings can be obtained by using fewer specimens, such as in the case of a specified experiment, test at least five specimens for each test condition. The steps specified in Practice E122 should be consulted for statistically significant data. Report the method of sampling.


    Core Materials Testing Services


    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      Send us a request

        Process for testing
          STEP 01

          You share material and testing requirements with us

          STEP 02

          You ship your sample to us or arrange for us to pick it up.

          STEP 03

          We deliver the test report to your email.

          Let’s work together!

          Share your testing requirements with us and we will be happy to assist you.

          ddd Just share your testing requirements and leave the rest on us!
          • Free, no-obligation consultation
          • Guaranteed confidentiality
          • Quick turnaround time
          • Hassle-free process


            Let us combine our capabilities to achieve success!!

              idea icon
              Want to connect with an expert before you leave?