Effect of Crowning Radius on Rolling Contact Fatigue Strength of Case-Hardened Steel Roller.

Yoshida, Akira; Ohue, Yuji; Matsuo, Kohei; Saeki, Shin; Hayakawa, Teiji

doi:10.1299/kikaic.64.3982

Cited by 1 publication

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“…Figures 15, 16 and Table 2 indicate that  w decreased as r c was increased. These results echo the findings in the report by Yoshida et al (1998). Figure 17 shows the failure initiation sites on the xy plane.…”

Section: Rolling Contact Fatigue Strengthsupporting

confidence: 88%

“…The crowning radius is thought to affect the rolling contact fatigue strength of traction drives. Yoshida et al (1998) conducted a rolling contact fatigue test on case-hardened rollers of Japan Industrial Standard (JIS) SCM415H chromium molybdenum steel with three different crowning radii and lubricated with gear oil, and reported that lifetime and surface durability diminished with increasing crowning radius. The experimental conditions were a slip ratio of 20% and roller surface roughness R a of several μm; both of these were set an order of magnitude or more higher than the actual values in a typical traction drive.…”

Section: Effect Of Crowning Radius On Rolling Contact Fatigue Strengtmentioning

confidence: 99%

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Effect of crowning radius on rolling contact fatigue strength for traction drive elements (Evaluation by simulation)

Narita

Kato

Yamanaka

et al. 2014

JAMDSM

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A simulation of the rolling contact fatigue strength of a traction drive element was developed. This simulation accounts for both the distribution of sizes of inclusions in the element material and the influence of traction forces at the element surface. The shear strength of the matrix structure surrounding an inclusion was estimated with an equation. The hardness distribution and the Weibull distribution of inclusion dimensions, which are necessary parameters to calculate the rolling contact fatigue strength, were determined by observation of an actual test specimen. The purpose of this report is simulations to evaluate the effect of the crowning radius on the rolling contact fatigue strength and the torque capacity. The simulations were carried out by varying the crowning radius of the virtual roller. To consider the effect of the crowning radius, a simulated two-dimensional virtual roller, which has actual material properties, was modified to a roller multilayered toward the axial direction. The simulation assuming the actual roller led to a difference of 1.0% from the experimental rolling contact fatigue strength. This difference was 2.4 points smaller than the result for the two-dimensional virtual roller. The rolling contact fatigue strength decreased with increasing crowning radius for two reasons. One was the increase in the number of inclusions under the high stress due to the increasing crowning radius. The other was the expansion of the portion of the roller subject to high stresses down to a depth having small hardness. However, the torque capacity calculated from the contact force resulting in failure increased with the increasing crowning radius.

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Section: Rolling Contact Fatigue Strengthsupporting

confidence: 88%

Section: Effect Of Crowning Radius On Rolling Contact Fatigue Strengtmentioning

confidence: 99%

Effect of crowning radius on rolling contact fatigue strength for traction drive elements (Evaluation by simulation)

Narita

Kato

Yamanaka

et al. 2014

JAMDSM

View full text Add to dashboard Cite

show abstract

Effect of Crowning Radius on Rolling Contact Fatigue Strength of Case-Hardened Steel Roller.

Cited by 1 publication

References 0 publications

Effect of crowning radius on rolling contact fatigue strength for traction drive elements (Evaluation by simulation)

Effect of crowning radius on rolling contact fatigue strength for traction drive elements (Evaluation by simulation)

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