By David W Hoeppner; International Symposium on Fretting Fatigue. <4, 1998, Salt Lake City, Utah>

ISBN-10: 0803128517

ISBN-13: 9780803128514

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Extra resources for Fretting fatigue : current technology and practices; [IV. International Symposium on Fretting Fatigue (2nd: 1998: University of Utah) ...]

Sample text

6. Model of contact specimen. . . l I I ; i ~ ii~;ifiiiiiii::ill; ; i " " - ~ ...... , I iO" 0 J I ,,IX' Fig. 7. F E M model of contact specimen. HATI-ORI ET AL. ON A NEW APPROACH 23 Fracture Mechanics Approach Fretting Fatigue Threshold The fretting fatigue threshold can be defined as the point at which the small crack that started at the contact edge ceases to propagate[7]. Hence we analyzed the fretting fatigue threshold by comparing the stress intensity factor range of the small fretting cracks that started at the contact edge and the range of the material's threshold stress intensity factor range.

I iO" 0 J I ,,IX' Fig. 7. F E M model of contact specimen. HATI-ORI ET AL. ON A NEW APPROACH 23 Fracture Mechanics Approach Fretting Fatigue Threshold The fretting fatigue threshold can be defined as the point at which the small crack that started at the contact edge ceases to propagate[7]. Hence we analyzed the fretting fatigue threshold by comparing the stress intensity factor range of the small fretting cracks that started at the contact edge and the range of the material's threshold stress intensity factor range.

Using Eq. 32, one can establish a simple mathematical expression for the relation between the dimensionless separation parameter ~ and the standard deviation and mean value of the probability density function 9 {~}, o, and ~ r =F,~c, respectively (plotted in Figure 7). Using Eqs. ~-~CjLmJirdLmi~ (33) j=l where the practical values of the integration limits fall within the range 0 < L ~ <4. Carrying out the integration after substituting for Fo in terms of Lmi~,and dividing by Zmio,one can estimate the ratio E [(Z)mj/Zm~~.

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Fretting fatigue : current technology and practices; [IV. International Symposium on Fretting Fatigue (2nd: 1998: University of Utah) ...] by David W Hoeppner; International Symposium on Fretting Fatigue. <4, 1998, Salt Lake City, Utah>


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