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Additional info for Fretting Fatigue: Advances in Basic Understanding and Applications (ASTM Special Technical Publication, 1425)

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The higher the rigidity of the pad was, the larger the relative shp became. Numerical analysis with the use of the fimte element method (FEM) program ABAQUS was also camed out. The relative slip estimated by the FEM agreed well with the observed one. Therefore, it was proved that the in-sltu observation method introduced m this study was effective enough for measunng relative slip at the contact edge. Keywords: fretting fatigue, relatwe slip, m-situ observation, FEM analysis Introduction Fretting fatigue is well known to occur at contact of combmed components, such as joints and bearings.

Org 34 FRETTINGFATIGUE: ADVANCES especially at contact edge should be important to determine the stick and the micro-sliding regions in the contact area during the fretting fatigue loading. In the present study, the relative slip amplitude along the contact interface was measured by the in-situ observation using a servo--hydraulic fatigue machine with a scanning electron microscope (SEM). FEM analysis was also carried out to evaluate the relative slip amplitude along the contact interface. From combining the results by experiments and FEM analysis, effect of rigidity of contact pad on relative slip amplitude was discussed in detail.

Fretting fatigue cycles and fatigue cycles (post-fretting) were tracked and reported. A graph of the cycles versus percent fretting fatigue life is presented in Figure 2. It is important to note that 4 of the 6 specimens did not fracture. Specimens C, D, E and F were cycled from 1,000,000 to 3,000,000 cycles and did not fracture. This indicates a fretting fatigue damage threshold for these conditions. Figures 3 and 4 show fretting damage on specimen A (100%FF). Note the detail in the depth record from the confocal microscope.

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