The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform
Wang Wei - One of the best experts on this subject based on the ideXlab platform.
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Tool Wear Modeling on Special Spiral Rod Milling Based on Power Signal
Modular Machine Tool & Automatic Manufacturing Technique, 2006Co-Authors: Wang Wei, Yao Jian-shiAbstract:Tool Wear model is presented by firstly extracting power signal eigenvalue through tool Wear analysis of special spiral rod milling,and then establishing the mapping between the signal eignevalue and the tool Wear value.As proved by experiments,the proposed model can effectively reflect the actual Wearing condition in spite of variable cutting parameters,serving as an important theory basis for on-line dimension compensation.
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Research on Tool Wear Modeling of Special Spiral Rod Milling
Manufacturing Technology & Machine Tool, 2006Co-Authors: Wang Wei, Yao Jianshi, Cai Guang-qiAbstract:Tool Wear Modeling method for spiral rod milling is presented. Firstly the variable cutting parameters of spiral rod milling are analyzed to extract the eigenvalue of vibration and power signals. Then the mapping between the signal eigenvalue and the tool Wear value is established. Thereby the tool Wear and breakage model is obtained. Experimental results have proved the effectiveness of the method proposed to reflect the actual tool condition during the milling process in spite of the varying cutting parameters. Moreover, it provides a new approach for tool condition monitoring of other milling processes with time-varying cutting parameters.
Jeanfrancois Molinari - One of the best experts on this subject based on the ideXlab platform.
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crack nucleation in the adhesive Wear of an elastic plastic half space
Journal of The Mechanics and Physics of Solids, 2020Co-Authors: Lucas Frérot, Guillaume Anciaux, Jeanfrancois MolinariAbstract:Abstract The detachment of material in an adhesive Wear process is driven by a fracture mechanism which is controlled by a critical length-scale. Previous efforts in multi-asperity Wear Modeling have applied this microscopic process to rough elastic contact. However, experimental data shows that the assumption of purely elastic deformation at rough contact interfaces is unrealistic, and that asperities in contact must deform plastically to accommodate the large contact stresses. We therefore investigate the consequences of plastic deformation on the macro-scale Wear response using novel elastoplastic contact simulations. The crack nucleation process at a rough contact interface is analyzed in a comparative study with a classical J2 plasticity approach and a saturation plasticity model. We show that plastic residual deformations in the J2 model heighten the surface tensile stresses, leading to a higher crack nucleation likelihood for contacts. This effect is shown to be stronger when the material is more ductile. We also show that elastic interactions between contacts can increase the likelihood of individual contacts nucleating cracks, irrespective of the contact constitutive model. This is supported by a statistical approach we develop based on a Greenwood–Williamson model modified to take into account the elastic interactions between contacts and the shear strength of the contact junction.
Yao Jian-shi - One of the best experts on this subject based on the ideXlab platform.
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Tool Wear Modeling on Special Spiral Rod Milling Based on Power Signal
Modular Machine Tool & Automatic Manufacturing Technique, 2006Co-Authors: Wang Wei, Yao Jian-shiAbstract:Tool Wear model is presented by firstly extracting power signal eigenvalue through tool Wear analysis of special spiral rod milling,and then establishing the mapping between the signal eignevalue and the tool Wear value.As proved by experiments,the proposed model can effectively reflect the actual Wearing condition in spite of variable cutting parameters,serving as an important theory basis for on-line dimension compensation.
Robert Hewson - One of the best experts on this subject based on the ideXlab platform.
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Predictive Wear Modeling of the articulating metal-on-metal hip replacements
Journal of biomedical materials research. Part B Applied biomaterials, 2015Co-Authors: Leiming Gao, Duncan Dowson, Robert HewsonAbstract:The lubrication regime in which artificial hip joints operate adds complexity to the prediction of Wear, as the joint operates in both the full fluid film regime-specifically the elastohydrodynamic lubrication (EHL) regime-and the mixed or boundary lubrication regimes, where contact between the bearing surfaces results in Wear. In this work, a Wear model is developed which considers lubrication for the first time via a transient EHL model of metal-on-metal hip replacements. This is a framework to investigate how the change in film thickness influences the Wear, which is important to further investigation of the complex Wear procedure, including tribocorrosion, in the lubricated hip implants. The Wear model applied here is based on the work of Sharif et al. who adapted the Archard Wear law by making the Wear rate a function of a relative film thickness nominalized by surface roughness for examining Wear of industrial gears. In this work, the gait cycle employed in hip simulator tests is computationally investigated and Wear is predicted for two sizes of metal-on-metal total hip replacements. The Wear results qualitatively predict the typical Wear curve obtained from experimental hip simulator tests, with an initial "running-in period" before a lower Wear rate is reached. The shape of the Wear scar has been simulated on both the acetabular cup and the femoral head bearing surfaces. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 497-506, 2017.
M H Aliabadi - One of the best experts on this subject based on the ideXlab platform.
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a boundary element formulation for Wear Modeling on 3d contact and rolling contact problems
International Journal of Solids and Structures, 2010Co-Authors: Luis Rodrigueztembleque, Ramon Abascal, M H AliabadiAbstract:The present work shows a new numerical treatment for Wear simulation on 3D contact and rolling-contact problems. This formulation is based on the boundary element method (BEM) for computing the elastic influence coefficients and on projection functions over the augmented Lagrangian for contact restrictions fulfillment. The constitutive equations of the potential contact zone are Signorini’s contact conditions, Coulomb’s law of friction and Holm–Archard’s law of Wear. The proposed methodology is applied to predict Wear on different contact and rolling-contact problems. Results are validated with numerical solutions and semi-analytical models presented in the literature. The BEM considers only the degrees of freedom involved on these kind of problems (those on the solids surfaces), reducing the number of unknowns and obtaining a very good approximation on contact tractions using a low number of elements. Together with the formulation, an acceleration strategy is presented allowing to reduce the times of resolution.
