Tests prove indentation technique for assessment of in-service line pipe

Techniques for testing in-service materials using portable indentation systems have been developed for more than 15 years. In one disadvantage, the techniques use material-specific parameters to determine yield strength of an unknown material, which must be premeasured from tensile testing of the material.Advances in fundamental understanding of materials' mechanical behaviors have made it possible to overcome this disadvantage. Limitations of a maximum strain of 0.2 in./in. have also been removed as a result of improvement of the analysis methodology.Other improvements, such as unloading curve analysis and pile-up and sink-in-effective quantification, have increased the accuracy of ...

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