ASTM E1681-03 Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials

ASTM E1681-03 Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials

ASTM E1681-03 Test Method determines the threshold stress intensity factor for environment-assisted cracking of metallic materials. A KEAC or KIEAC value represents a characteristic measurement of environment-assisted cracking resistance in a pre-cracked specimen exposed to an environment under sustained tensile loading. Test results are affected by force relaxation in constant displacement bolt-loaded compact specimens for some material/environment conditions.

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    Scope:

    ASTM E1681-03 test method covers the determination of the environment-assisted cracking threshold stress intensity factor parameters, KIEAC and KEAC, for metallic materials. Materials tested by ASTM E1681-03 test method are not limited by thickness or by strength as long as specimens are of sufficient thickness and planar size to meet the size requirements of this test method.

    Test Procedure:  

    The parameters KEAC or KIEAC determined by ASTM E1681-03 test method characterize the resistance to crack growth of a material with a sharp crack in specific environments under loading conditions in which the crack-tip plastic region is small compared with the crack depth and the uncracked ligament. A measured KEAC or KIEAC value for a particular combination of material and environment may represent an acceptably low rate of crack growth rather than an absolute upper limit for crack stability.

    Specimen size:

    A range of specimen sizes with proportional planar dimensions, adjusted for yield strength and applied force may be used in  the ASTM E1681-03 test method. Specimen thickness is a variable independent of planar size. 

    Data:

    A change in the zero-force value of crack-mouth-opening displacement as a result of pre crack growth is another indication that residual stresses will affect the subsequent environment-assisted crack growth.

    Conclusion:

    ASTM E1681-03 provides details about the test method for measurement of the Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials.

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