ASTM E139-11 Creep, creep rupture and stress rupture test of metallic materials

ASTM E139-11 Creep, creep rupture and stress rupture test of metallic materials

ASTM E13-11 test method involves Creep and Rupture test for metallic materials. The Creep test measures the load-carrying capacity of material up to limited deformation. The rupture test measures load carrying capacity as a function of time. These tests complement each other for determining the load-carrying capacity of Metallic materials.

    Scope:

    ASTM E13-11 test method is used to estimate the amount of deformation as a function of time in creep test and the measurement of the time required to form a fracture when sufficient force is present for materials when under constant tensile forces at a constant temperature in rupture test. It also includes the essential requirements for testing equipment. 

    Test Procedure:

    This is an eight-step method, where initially all cross-sectional area of the test specimen is measured. Then Original length is measured. The specimen needs to be washed carefully, at reduced sections and the parts of the specimen which contact the grips, in clean alcohol, acetone, or other suitable solvents that will not affect the metal being tested. Then thermocouple is attached to the specimen to control the temperature during the test. Then the Specimen is connected to the machine. Care must be taken while connecting the specimen to the machine. During the test, strain is to be measured for creep or creep rupture test. Then force is applied on the specimen in such a manner that shock forces or excess forces due to inertia are avoided. The force may be applied in increments with strain readings between increments to provide stress-strain data for the application of the force. Then elongation and reduction in the area are measured. 

    Specimen size:

    The size and shape of test specimens shall be based primarily on the requirements necessary to obtain representative samples of the material being investigated or as required by the specification.

    Data

    Method of Calculating Elongation When the Gage Length Is Marked on the Reduced Section of the Specimen

    Method of Calculating Elongation When the Original Gage Length Includes Fillets, Shoulders, Threads etc.

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