Crack Paths 2012

Changeof Electrical Potential during Fatigue

The change in the electrical potential under cyclic shear stress amplitude of 180MPain

case A for SUSis shown in Fig. 3(a), where the electrical potential was normalized by

the initial value. The number of stress cycles at point where the electrical potential

shows a rapid increase is considered to indicate crack initiation. It is interesting to note

that N C specimen shows the earliest rise in the electrical potential, followed by N B

specimen and N Aspecimen. The crack initiation life is shorter as the notch gets sharper.

Figure 3(a) Change of electrical potential during fatigue of SUS316Lin case A.

Figure 3(b) Change of electrical potential during fatigue of SGV410in case A.

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