Determining Breaking Strength or Modulus of Rupture of Tiles ASTM C1505

Determining Breaking Strength or Modulus of Rupture of Tiles ASTM C1505

ASTM C1505 determines Breaking Strength or Modulus of Rupture of Ceramic Tiles and Glass Tiles using Three-Point Loading test. Modulus of rupture measures the bonding strength of the test specimen. This test is useful for materials intended to be used as a support structure.


    ASTM C1505 is used to determine the bending behaviour of Ceramic Tiles and Glass Tiles under stress. The test is performed in compliance with the requirements of the product specification—a document that lays out the process of manufacturing of a particular product.

    Manufacturers often need to understand a material’s behavior under different kinds of stresses. A simple compression test may not give all the necessary information. When a specimen is placed under three-point bending test, all three fundamental stresses are present: tensile, compressive, and shear, and so the flexural properties of a specimen are the result of the combined effect of all three stresses as well as the geometry of the specimen and the rate the load is applied. For this reason, three point bend testing is commonly used to assess the behaviour of materials under realistic loading situations.

    Bending test data can be particularly useful when a material is to be used as a support structure. Not only do manufacturers want to provide a product that can hold expected loads, the material also needs to return to its original shape if any bending occurs.

    Test Procedure:

    The ceramic or glass tile sample is placed on two ridges and a direct load is applied at the midpoint of the sample until the sample breaks. The maximum stress that the sample withstand before breaking is the breaking strength of the tile.


    Modulus of rupture:

    M = 3 PL/2bd2

    M = modulus of rupture
    P = load at rupture
    L = distance between supports
    d = diameter of specimen


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