Numerical Simulation of Elastic-Plastic Non-Conforming Contact

Spinu, Sergiu; FRUNZA, Gheorghe; Diaconescu, Emanuel

doi:10.5772/13228

Cited by 4 publications

(5 citation statements)

References 19 publications

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“…As shown in [15], a central plateau of uniform pressure can also be found in the elastic-plastic nonconforming contact, when the residual term of displacement and of subsurface stresses becomes significant. The residual print due to permanent deformation of the surface, acting together with the hardening of the elastic-plastic material, decrease the central pressure computed according to the elastic model.…”

Section: Numerical Validationmentioning

confidence: 89%

Improved Pressure Distribution in Elliptic Elastic Contacts between High-Order Surfaces

Glovnea

Spinu

Diaconescu

2012

Advances in Tribology

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The improvement of mechanical contacts or microcontacts seeks a nearly uniform current density over most of contact area. When microtopography is homogeneous, this aim is achieved if nominal shape of contacting surfaces yields a nearly uniform central pressure which decreases monotonously to zero in contour points. These authors derived recently this shape for circular contacts by employing high-order surfaces. This paper extends this result to elliptical contacts. Some results are used to this end, derived for elliptical elastic contacts between high-order surfaces. As homogeneous high order surfaces lead to a highly nonuniform pressure distribution, central pressure is flattened by making the first derivatives of pressure vanish in contact center. Then, the contacts between fourth, sixth, and eighth, order surfaces are analyzed and recurrence relations for pressure distribution and contact parameters are proposed.

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Section: Numerical Validationmentioning

confidence: 89%

Improved Pressure Distribution in Elliptic Elastic Contacts between High-Order Surfaces

Glovnea

Spinu

Diaconescu

2012

Advances in Tribology

Self Cite

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“…The displacement field was calculated under the assumption of linear elasticity, whereas the defined material parameters for AISI 4140 allowed the plasticity to be mapped. The different load levels during a step-by-step roller contact described by Spinu et al were neglected because of the constant pressure and the uniform deep rolling velocity 𝑣𝑣 𝑑𝑑𝑑𝑑 [12]. The feed motion was approximated by a transient linear load activation.…”

Section: Modelingmentioning

confidence: 99%

“…The calculation area changes in the plastic case to a rectangular cuboid, whereby a corresponding simplification was made in the boundary definition since the focus was especially on the calibration of the workpiece model concerning the distortion. The force source 𝐹𝐹 𝑑𝑑𝑑𝑑 was based on a defined exponential function to represent the pressure area of the Hertzian compression with the central load maximum based on the assumptions of Spinu et al [12]. Therefore, within this contact radius 85 % of the load was set to approximate the pressure area of the rectangular cuboid.…”

Section: Modelingmentioning

confidence: 99%

Modeling of Deep Rolling as a Distortion Compensation Strategy during Profile Grinding

Schieber

Hettig

Zaeh

et al. 2022

KEM

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This paper analyzes the possibility to induce residual compressive stresses utilizing deep rolling in a long, slim steel workpiece that is profile ground and that resembles a linear guide rail. These intentionally caused residual compressive stresses at the side surfaces of the workpiece are intended to counteract the distortion due to residual stresses in the V-groove of the guide rail induced by grinding. A finite element model was prepared based on the initial state of the workpiece. The amount of respective stresses depended on the load intensity and duration of the process. The experimental data regarding the residual stress profiles due to the deep rolling process and the resulting workpiece distortion were used to validate the simulation, so that an adjustment or a calibration of the thermometallurgical and thermomechanical material data was possible. The key findings are the numerical design of appropriate strategies for the distortion potential induction, the experimental distortion results, knowledge on the mechanical treatment by deep rolling, and the successful modeling of the mechanical treatment and the process strategy.

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“…This simplification was made as described below in the calibration of the workpiece model. The pressure area was defined according to Spinu et al based on a defined exponential function [35]. Within the resulting contact area, a load of 85% was applied to approximate the compression area of the cuboid.…”

Section: Mechanical Modelmentioning

confidence: 99%

“…The determination of the AISI 4140 material's parameters based on the manufacturing history of the workpiece allowed the plasticity to be modeled. Different loading levels, as described by Spinu et al during a stepby-step rolling contact, were disregarded due to constant pressure and a uniform deep rolling velocity [35]. The feed rate per surface on the sides of the V-groove was approxi- In the contact zone between the grinding wheel and the workpiece, mechanical loads occurred in addition to the thermal loads.…”

Section: Mechanical Modelmentioning

confidence: 99%

Combination of Thermal and Mechanical Strategies to Compensate for Distortion Effects during Profile Grinding

et al. 2022

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This paper describes the investigations and the results of an analysis of distortion compensation processes for profile grinding. Steel workpieces often change their residual stress state due to machining in a seemingly uncontrolled matter. Furthermore, in research as well as in the industry, the accurate representation of shape deviations during the cutting of slim profiled workpieces and their deformation handling is a major challenge. In this paper, a valid predictive model, developed for the compensation of distortions resulting from the effect of a laser-based treatment and a deep rolling, was calibrated by experimental data. The numerical design of these strategies provided a model for predicting compensation parameters to minimize profile grinding distortions.

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Numerical Simulation of Elastic-Plastic Non-Conforming Contact

Cited by 4 publications

References 19 publications

Improved Pressure Distribution in Elliptic Elastic Contacts between High-Order Surfaces

Improved Pressure Distribution in Elliptic Elastic Contacts between High-Order Surfaces

Modeling of Deep Rolling as a Distortion Compensation Strategy during Profile Grinding

Combination of Thermal and Mechanical Strategies to Compensate for Distortion Effects during Profile Grinding

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