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<i>J-R</i> Curve Testing Utilizing the Reversing Direct Current Electrical Potential Drop Method

V. Bicego,D Liviero,Caroline Fossati,Enrico Lucon-1990-01-01
6

TL;DRAbstract

A Reversing Direct Current Electrical Potential Drop (RDCEPD) method has been implemented at CISE for crack monitoring in laboratory tests on specimens of metallic materials. Convenient features of the method are simple and cheap electronics, good insensitivity to noise from the environment, insensitivity to thermoelectrical potentials, and compensation for current and temperature fluctuations. The method is suitable for low-cycle fatigue crack initiation studies, fatigue, corrosion and creep crack growth tests, and J-integral tests. In the latter case, difficulties in obtaining reliable crack length values, due to resistivity changes in the plastically strained material of the specimen, are discussed on the basis of an experimental analysis on different types of steels.

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A Reversing Direct Current Electrical Potential Drop (RDCEPD) method has been implemented at CISE for crack monitoring in laboratory tests on specimens of metallic materials. Convenient features of the method are simple and cheap electronics, good insensitivity to noise from the environment, insensitivity to thermoelectrical potentials, and compensation for current and temperature fluctuations. The method is suitable for low-cycle fatigue crack initiation studies, fatigue, corrosion and creep crack growth tests, and J-integral tests. In the latter case, difficulties in obtaining reliable crack length values, due to resistivity changes in the plastically strained material of the specimen, are discussed on the basis of an experimental analysis on different types of steels.

Keywords

ReversingMaterials scienceVoltage dropDrop (telecommunication)CreepElectrical resistivity and conductivityDirect currentNoise (video)

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