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Keywords: elasticity
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Journal Articles
Article Type: Research Papers
J. Tribol. October 2011, 133(4): 041402.
Published Online: October 6, 2011
...Thibaut Chaise; Daniel Nélias What is often referred to as a Hertzian contact can undergo plasticity either at the macroscale, due to an accidental overload, or at an asperity scale, due to the presence of surface defects and/or roughness. An elastic solution does not explicitly consider...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2011, 133(4): 041001.
Published Online: August 9, 2011
...Dong Zhu; Q. Jane Wang Elastohydrodynamic Lubrication (EHL) is commonly known as a mode of fluid-film lubrication in which the mechanism of hydrodynamic film formation is enhanced by surface elastic deformation and lubricant viscosity increase due to high pressure. It has been an active...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2011, 133(3): 031703.
Published Online: July 28, 2011
... containing additives and contaminants has been modeled using Erigen’s micropolar theory. The journal misalignment which may occur as a result of noncentral loading, improper assembly, shaft deflection due to elasticity and thermal distortions, etc. has been accounted for in the present study by defining...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2011, 133(3): 031406.
Published Online: July 25, 2011
...H. Eid; N. Joshi; N. E. McGruer; G. G. Adams A finite element model of a layered hemisphere contacting a rigid flat, which includes the effect of adhesion, is developed. In this analysis elastic-plastic material properties were used for each of the materials comprising the layered hemisphere...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2011, 133(3): 031402.
Published Online: July 1, 2011
... ), and introducing the ψ factor reduced the deviation to −9.55%, while for ν of 0.15, the maximum error was −11.30%, which was reduced to + 0 . 60 % with the ψ factor. This study introduces the factor ψ in a 3D elastic contact algorithm. The resulting calculation scheme is then able to simulate any point or line...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2011, 133(1): 011401.
Published Online: January 4, 2011
... wires at different angles are compared with an elastic-plastic microcontact model for elliptical contact areas. These numerical results are then compared with experimental ones for the contact between two wires of a conductor (ACSR Bersfort), showing a very similar relationship between the contact force...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2010, 132(4): 041402.
Published Online: October 1, 2010
...Raja R. Katta; Andreas A. Polycarpou A contact mechanics (CM) based model of a fixed-length rigid cylinder impacting a homogeneous elastic-plastic homogeneous body was developed and includes an improved method of estimating the residual depth after impact. The nonlinear elastic behavior during...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2010, 132(4): 041401.
Published Online: September 13, 2010
...Y. Zait; V. Zolotarevsky; Y. Kligerman; I. Etsion The multiple normal loading-unloading process of an elastic-plastic sphere by a rigid flat is analyzed using finite element method for stick contact condition and both kinematic and isotropic hardening models. The behavior of the global contact...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2010, 132(3): 031604.
Published Online: July 21, 2010
... are dictated by wear. The procedures consist of coupled iterative analyses between a dynamic system analysis with nonideal joints and a wear prediction to determine the evolution of the joint clearance. In the first procedure, joint forces and contact pressures are estimated using the elastic foundation model...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2010, 132(2): 021706.
Published Online: April 26, 2010
...Kai Feng; Shigehiko Kaneko A complete analytical model of bump-type foil bearings taking into consideration the effects of four factors, i.e., the elasticity of bump foil, the interaction forces between bumps, the friction forces at the contact surfaces, and the local deflection of top foil...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2010, 132(2): 021502.
Published Online: April 6, 2010
...Shangwu Xiong; Chih Lin; Yansong Wang; Wing Kam Liu; Q. Jane Wang A compliance operator is often utilized to evaluate the elastic displacement of surfaces in the simulation of transient and steady-state elastohydrodynamic lubrication of conformal-contact systems. The values of the compliance...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2010, 132(2): 022201.
Published Online: April 6, 2010
..., provided that the seal gap remained larger than 20   μ , as the assumption of continuum flow regime breaks down for smaller gaps. The operating equilibrium position of the seal under the aerodynamic and elastic forces was also determined, thus allowing a more accurate mapping of the seal...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2010, 132(2): 021702.
Published Online: March 25, 2010
... framework and linear elasticity. The oil film pressure and flow are considered to follow the modified Reynolds equation, which includes the contribution from controllable radial oil injection. The Reynolds equation is solved using a two-dimensional finite element mesh. The rotor is considered to be rigid...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2010, 132(2): 021403.
Published Online: March 11, 2010
...Zhan-Jiang Wang; Wen-Zhong Wang; Hui Wang; Dong Zhu; Yuan-Zhong Hu An elastic contact model for three-dimensional layered or coated materials under coupled normal and tangential loads, with consideration of partial slip effects, has been developed in this paper. The response functions...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2010, 132(1): 011901.
Published Online: December 10, 2009
... bearing. The contact and adhesion between the slider and the disk are considered either through an elastic contact model and an improved intermolecular adhesion model, respectively, or using an Ono–Yamane multi-asperity contact and adhesion model ( 2007, “Improved Analysis of Unstable Bouncing Vibration...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2009, 131(4): 042203.
Published Online: September 24, 2009
... of modified designs and a baseline elastic, one-material design was calculated in finite element models using experimentally measured time-dependent material behavior. The elastic strain energy fields in O-ring sections were calculated under applied pressure and applied displacement loadings. The highest...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2009, 131(4): 041402.
Published Online: September 23, 2009
... in the plastic flow regime. Shoulder-shoulder asperity contact gives rise to a slanted contact force comprising tangential and normal components. Each force component comprises elastic and plastic terms, which upon statistical summation yields the force component for the elastic and plastic forces...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2009, 131(4): 041703.
Published Online: September 22, 2009
... with increasing excitation frequency. 15 01 2009 18 06 2009 22 09 2009 elasticity foils friction high-temperature effects machine bearings mechanical contact thermal expansion turbomachinery foil bearing bump structure stiffness damping dry-friction high temperature...
Journal Articles
Article Type: Technical Briefs
J. Tribol. July 2009, 131(3): 034503.
Published Online: June 1, 2009
... misalignment, and thereby contact moment is derived. Through this scheme it is possible to also define elastic contribution to friction, since the half-plane tangential contact force on one side of an asperity is no longer balanced by the half-plane tangential force component on the opposite side. The elastic...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2009, 131(3): 032001.
Published Online: May 27, 2009
... of 7 × 10 6 mm rpm ) was achieved demonstrating the feasibility of MEMS-based micro-scale rotating machinery and validating key aspects of the micro-gas-bearing theory. 15 04 2006 27 02 2009 27 05 2009 elasticity gas turbines machine bearings microfabrication micromechanical...