| US 7,577,555 B2 | ||
| Apparatus and method for determining patterns of damage being caused in rolling contact element | ||
| Atsushi Umeda, Okazaki (Japan); Tsutomu Shiga, Nukata-gun (Japan); and Kouichi Ihata, Okazaki (Japan) | ||
| Assigned to Denso Corporation, Kariya (Japan) | ||
| Filed on Jul. 26, 2006, as Appl. No. 11/492,775. | ||
| Claims priority of application No. 2005-215378 (JP), filed on Jul. 26, 2005. | ||
| Prior Publication US 2007/0044543 A1, Mar. 01, 2007 | ||
| Int. Cl. G06F 17/10 (2006.01) | ||
| U.S. Cl. 703—2 [703/7; 702/34; 702/42; 384/49; 384/50] | 14 Claims |
| 1. A computer-implemented method of determining damage of a mechanical element composed of rolling elements and a stationary
member or a component part composed of more than two rolling elements for establishing a rolling contact, the method comprising
steps of:
representing factors of the mechanical element with magnitudes of a shear strain and a shear strain rate occurring in the
contact element resulting from an external or internal stress;
providing discrimination values obtained from material characteristics of the rolling element and a loading method;
comparing the magnitudes of the shear strain and the shear strain rate to the discrimination values so as to judge mechanical
damage patterns of the mechanical element; and
outputting, as information indicating the damage of the mechanical element, information indicating the judged damage patterns
using the computer, wherein
the discrimination values include five values related to a yield point shear strain, an adiabatic shear deformation limit
strain, an adiabatic shear deformation limit strain rate, a breakdown-point shear strain, and an impact occurrence strain
rate of the loading method for making judgment on the mechanical damage patterns of the mechanical element.
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