Gordana Marunić

Effects of Rim and Web Thickness on Gear Tooth Root, Rim and Web Stresses

The paper presents a study on the tooth root, rim and web stresses of thin-rimmed spur gear structure with symmetrical web, based upon 3D FEM calculations. In order to identify some gear design directions, the effects of rim and web thickness on gear stress behaviour are investigated, and maximum stresses resulting from actual rim and web contribution are compared.

Rim Stress Analysis of Thin-Rimmed Gear

The research into the stress state of gear rim has been based on the developed model of pinion-wheel system and the finite element application. For a spur gear structure of middle web position, the assumption of load distribution in the contact area that reflects, first of all, the tooth support deformation, has been not required for the imposed boundary conditions. To study the influence of web thickness stiffening effect on the inner rim surface stress, the ranges of rim and web thickness values have been considered. The area of stress along the rim circle and tooth facewidth has been shaped and discussed in relation to maximum rim stress appearance.

Application of glyph-based techniques for multivariate engineering visualization

This article presents a review of glyph-based techniques for engineering visualization as well as practical application for the multivariate visualization process. Two glyph techniques, Chernoff faces and star glyphs, uncommonly used in engineering practice, are described, applied to the selected data set, run through the chosen optimization methods and user evaluated. As an example of how these techniques function, a set of data for the optimization of a heat exchanger with a microchannel coil is adopted for visualization. The results acquired by the chosen visualization techniques are related to the results of optimization carried out by the response surface method and compared with the results of user evaluation. Based on the data set from engineering research and practice, the advantages and disadvantages of these techniques for engineering visualization are identified and discussed.

Comparison between 3D FEM and Standard ISO Tooth Root Stresses

The paper deals with the discussion how nominal spur tooth root stress of thin-rimmed gear determined in accordance with the standard ISO 6336-3:2006, method B, agrees with the results of the 3D FEM stress analysis. The procedure proposed by standard ISO for the tooth root stress calculation doesn’t identify the stress behaviour related to mutual affects of characteristic thin-rimmed gear geometrical parameters. Therefore, the 3D FEM analysis of tooth root stress has been performed for gear structures with middle and offset web with various rim and web thickness. The rim thickness has covered and slightly overcome the backup ratio defined by ISO procedure, while the web thickness has covered the range of practical interest.

Comparison of Solid Spur Gear Face Load Factors

The research into stress state of standard spur gear has enabled the comparison of analytically and numerically established effect of a load distribution over the facewidth, upon the stresses at the tooth-root.

Fillet Stress Related to Non-Uniformly Loaded Gear Tooth Geometry

The influence of non-uniform load distribution along spur gear tooth facewidth, upon the fillet stresses, has been investigated by means of the Finite Element Method p-version. There have been taken into consideration different load distribution cases corresponding to the contact without errors, the possible alignment error in fitting the gear, and the effect of gear crowning. The results of the investigation performed by 3D numerical approach, have enabled the determination of spur tooth stress maximum value and its position both, along the tooth fillet and facewidth, for complex combined influence of gear geometrical parameters and non-uniform load distribution. The obtained maximum equivalent von Mises stress and axial stress that arises in the direction of gear axis, were compared for different load distribution acting along the tooth facewidth.