The fretting fatigue behavior of shot-peened of IN 100 was investigated in this study. S-N curves were obtained for two different shot-peened intensities (7A and 12A) and were compared to those of unpeened specimens. Stress relaxation behavior under fretting fatigue was also investigated after their measurements were obtained using the Xray diffraction method. The crack initiation location and the crack angle orientation along the surface were determined using optical and scanning electron microscopy (SEM). Cracks initiated near the trailing edge and on the contact surface for both 7A and 12A shot-peened specimens. Finite element analysis was performed using commercially available software, ABAQUS, to obtain contact region state variables such as stress, strain and displacement. These state variables were needed for the computation of fretting fatigue parameters, such as stress range, effective stress, shear stress range (SSR) and modified shear stress range (MSSR), which were further analyzed. It was found that there was relaxation of residual compressive stress during fretting fatigue up to a certain depth. The effects of shot-peening were negated relatively early in the fretting fatigue life. There was little difference in fretting fatigue life between the two intensities of shotpeening, but there was an improvement in relation to unpeened specimens. Also, the MSSR parameter, a critical plane based fatigue parameter, was effective in characterizing the fretting fatigue behavior in terms of fatigue life, crack initiation location and orientation. However, it is not applicable to both shot-peened and unpeened cases simultaneously to yield a single trend. This may be due to the peened specimens having been plastically-deformed on the surface and the unpeened specimens remain unchanged, and hence they were two different types of material which did not to act the same way under fretting fatigue conditions.
The fretting fatigue behavior of shot-peened of IN 100 was investigated in this study. S-N curves were obtained for two different shot-peened intensities (7A and 12A) and were compared to those of unpeened specimens. Stress relaxation behavior under fretting fatigue was also investigated after their measurements were obtained using the Xray diffraction method. The crack initiation location and the crack angle orientation along the surface were determined using optical and scanning electron microscopy (SEM). Cracks initiated near the trailing edge and on the contact surface for both 7A and 12A shot-peened specimens. Finite element analysis was performed using commercially available software, ABAQUS, to obtain contact region state variables such as stress, strain and displacement. These state variables were needed for the computation of fretting fatigue parameters, such as stress range, effective stress, shear stress range (SSR) and modified shear stress range (MSSR), which were further analyzed. It was found that there was relaxation of residual compressive stress during fretting fatigue up to a certain depth. The effects of shot-peening were negated relatively early in the fretting fatigue life. There was little difference in fretting fatigue life between the two intensities of shotpeening, but there was an improvement in relation to unpeened specimens. Also, the MSSR parameter, a critical plane based fatigue parameter, was effective in characterizing the fretting fatigue behavior in terms of fatigue life, crack initiation location and orientation. However, it is not applicable to both shot-peened and unpeened cases simultaneously to yield a single trend. This may be due to the peened specimens having been plastically-deformed on the surface and the unpeened specimens remain unchanged, and hence they were two different types of material which did not to act the same way under fretting fatigue conditions.
Fretting fatigue occurs between two components in contact under relative motion and reduces fatigue life when compared with plain fatigue. Shot-peening, on the other hand, is the most commonly used...
This thesis studied the effect of microstructure on the fretting fatigue behavior of IN-100. First, fretting and plain fatigue S-N curves were determined over a large range of applied stress at an...
This thesis studied the effect of elevated temperature (600 C) on the fretting fatigue behavior of IN-100. First, fretting and plain fatigue S-N curves were determined over a large range of applied...
This book, which has only one very distant forerunner authored by David A. Hills with David Nowell, represents a very big step that is the quantification of these problems and represents...
The fatigue lives of modern powder metallurgy disk alloys can be reduced by over an order of magnitude by surface cracking at inherent non-metallic inclusions. The objective of this work was to study...
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