Leeb Hardness Testing of Steel Products ASTM A956

Leeb Hardness Testing of Steel Products ASTM A956

The hardness of a moving body is determined using the ASTM A956 Leeb Hardness testing method, which uses the ratio of rebound velocity to impact velocity. It's a nondestructive testing technique. The Leeb hardness test utilizes the dynamic or rebound property, which primarily depends both on the plastic and on the elastic properties of the material being tested.

    Scope:

    The Leeb hardness test, ASTM A956, is a dynamic or rebound method that determines the Leeb hardness by comparing the rebound velocity to the impact velocity of a tungsten carbide ball or a diamond-tipped impact body. This portable approach is mostly used for determining whether or not a workpiece is sufficiently large. It calculates the restitution coefficient. The Leeb hardness of steel, cast steel, and cast iron is determined by ASTM A956, and the results are indicative of strength and depend on the heat treatment of the material examined.

    Test Procedure:

    During a hardness test, an impact body with a spherically shaped tungsten carbide, silicon nitride, or diamond tip impacts, after being propelled to the specified velocity, the test surface from which it rebounds. The impact and rebound velocities are measured when the impact body is approximately 0.039 inches [1 mm] from the test surface. This is accomplished utilizing a permanent magnet mounted in the impact body which, during the test, moves through a coil in the impact device and induces an electric voltage on both the impact and rebound movements. The quotient of these measured voltage values derived from the impact and rebound velocities, multiplied by the factor 1000 produces a number that constitutes the Leeb hardness value.

     Specimen size:

    Test pieces, with curved surfaces, may be tested on their convex or concave surfaces providing the radius of curvature of the test specimens not less than 1.181 inches (30 mm) for impact devices. 

    Data:

    Leeb hardness is reported in SI unit or Inch-pound and is considered as standard separately. Leeb Hardness is calculated as :

    L= (Rebound Velocity / Impact Velocity) x 1000

    OUR SERVICES

    Core Materials Testing Services

    Metrology

    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 500+ Material Test already Done for top companies

      Send us a request