ASTM C1358 Test for Compressive Strength of Advanced Ceramics

ASTM C1358 is used to determine compressive strength, including stress-strain behavior under monotonic uniaxial loading, of continuous fiber-reinforced advanced ceramics (CFCC) at ambient temperatures. This test is used for material development, material comparison, characterization, reliability assessment, quality assurance, and design data generation of CFCCs. The values stated in SI units are to be regarded as the standard... Read More

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    Scope:

    The ASTM C1358 test method applies to advanced ceramic matrix composites with continuous fiber reinforcement. It could be unidirectional (1D), bidirectional (2D), and tri-directional (3D), or other multi-directional reinforcements. This test is also applicable to glass (amorphous) matrix composites with 1D, 2D, 3D, and other multi-directional continuous fiber reinforcements. Although ASTM C1358 does not directly address discontinuous, fiber-reinforced, whisker-reinforced, or particulate-reinforced ceramics, it can be equally applicable to these composites.

    Compressive strength refers to the compressive strength obtained under monotonic uniaxial loading, where monotonic refers to a continuous nonstop test rate with no reversals during the tests.  

    Test Procedure:

    The specimen, whose ASTM C1358 test is to be done, is mounted on the load train. Specimens with different grip interfaces and specimen geometry are mounted differently. The dimensions of the specimens are determined. The test modes and rates to be used for specific specimens are determined. 

    The test mode and test rate are selected on the test machine. The specimen is preloaded to remove the “slack” from the load train, and the amount of preload used is reported. The amount of preload for each situation is specific to each material’s tensile test specimen geometry. The data acquisition and test mode are initiated. The specimen is compressed till fracture. After that, the action of the test machine and the data collection of the data acquisition system are disabled. 

    For ASTM C1358, the breaking load is measured and reported within 61.0% of the load range. The specimen is carefully removed from the grip interfaces. The specimen halves are placed along with other fragments from the gauge section into a suitable, non metallic container for later analysis. 

    Specimen Size: 

    The test specimens used in ASTM C1358 testing should have solid rectangular cross sections. The minimum gauge length should be 25 mm. The length of the gripped sections at each end of the specimen should be at least 50 mm. The minimum width should be 10 mm and the minimum thickness should be 3 mm. 

    Data: 

    The following data is calculated in ASTM C1358 testing:

    1. Engineering Stress: 

    σ = the engineering stress,

    P = the applied, uniaxial tensile load. 

    A = the original cross-sectional area.

    1. Engineering Strain

    ε = the engineering strain, 

    I = the extensometer gauge length at any time, and I0 = the original gauge length of the extensometer. 

    1. Tensile strength:

    S= the tensile strength

    Pmax = the maximum load

    1. Modulus of Elasticity:

    where 

    E = modulus of elasticity, 

    = the slope of the (σh– εh) curve within the linear region. 

    Conclusion:

    ASTM C1358 is used to determine compressive strength, including stress-strain behavior under monotonic uniaxial loading, of continuous fiber-reinforced advanced ceramics (CFCC) at ambient temperatures.

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