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TECHNICAL BRIEFS

Determination of Mode of Damage During Creep-Fatigue Interaction

[+] Author and Article Information
M. Javed Hyder

 Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistanm̱javeḏhyder@yahoo.com; hyder@pieas.edu.pk

J. Eng. Mater. Technol 128(2), 248-252 (Jul 05, 2005) (5 pages) doi:10.1115/1.2172628 History: Received June 17, 2004; Revised July 05, 2005

A technique has been developed using the reversing dc electrical potential method to determine the mode of damage taking place during creep-fatigue interaction. It is observed that the hysteresis loop created by plotting the stress verses electrical potential gives a clear indication whether the damage in process is creep dominated or fatigue-dominated. During the fatigue-dominated damage process the hysteresis loop of stress verses electrical potential changes the shape whereas during the creep-dominated damage process the hysteresis loop of stress verses electrical potential does not change the shape but moves in the direction of higher electrical potential values. These changes are observed well before any indication seen on the conventional hysteresis loop of stress verses strain. This identification of the damage mode is observed well before failure occurs. The conclusion has been confirmed through fractographs. Hence it can be said that this technique eliminates the need for fractographs when determining the mode of damage during creep-fatigue interaction.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Details of a bimetal test specimen

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Figure 2

Experimental setup

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Figure 3

Data acquisition sequence and current wave shape

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Figure 4

Fractograph at a magnification of 20 of an equal-equal wave shape test

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Figure 5

Fractograph at a magnification of 1K of equal-equal wave shape test, clearly indicating trans-granular failure

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Figure 6

Fractograph at a magnification of 50 of a 28MPa hold test

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Figure 7

Fractograph at a magnification of 500 of a 28MPa hold test, clearly indicating an intergranular fracture

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Figure 8

Stress verses an electrical potential hysteresis loop of an equal-equal wave shape test showing the initial 190cycles

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Figure 9

Stress verses the electrical potential hysteresis loop of an equal-equal wave shape test showing the last cycles

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Figure 10

Conventional stress verses the strain hysteresis loop of an equal-equal wave shape test

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Figure 11

Conventional stress verses the strain hysteresis loop of a 28MPa hold test

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Figure 12

Stress verses electrical potential hysteresis loop of a 28MPa hold test

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