Issue 0
JTAM, Sofia, vol. 0 Issue 0 (999)

FRICTION VARIATOR WITH MINIMAL SLIDING BETWEEN THE WORKING SURFACES WHEN ADJUSTING THE TRANSMISSION RATIO

Venelin S. Jivkov, Kostadin K. Stoichkov, Yana P. Stoyanova
Department of Mechanisms and Machines Theory, Faculty of Industrial Technology, Technical University, Sofia, Bulgaria


The subject of the present study is the synthesis of a friction Variator with theoretically zero geometric sliding between the working surfaces when changing the transmission ratio, i.e. the adjustment takes place with centroid rolling. The working surfaces are obtained by rotating the centroid pairs around in axes, provided that their point of intersection always lies on the common tangent of the two contours. With the help of elements of differential geometry the firs order system equations have been derived and solved in an analytical form, whose integrals uniquely define the centroid pairs. The possibilities for changing the transmission ratio of the innovative kinematic and structural schemes of the friction Variator have been analyzed. Its practical applicability in Industry has been proved.

JTAM, Sofia, vol. 0 Issue 0 pp. (999)

NUMERICAL STUDY OF FGM SANDWICHES PLATE UNDER THE EFFECT OF THERMO-MECHANICAL LOADS

Soufiane Abbas1,2, Billel Rebai3
1Center of Research in Mechanics (CRM), PO Box 73 B, Constantine 25000, Algeria
2LMRS Laboratory, Faculty of Technology, Université Djillali LIABES Sidi-Bel-Abbès, Algeria
3Faculty of Sciences and Technology, Civil Eng. Department, University Abbes Laghrour, Khenchela, Algeria

This article presents a study on the behavior of rectangular functionally graded plates under thermo-mechanical bending conditions. The study employs a finite element method to analyze these plates, consisting of functionally graded face sheets and core. Validating the proposed model's accuracy through comparisons with existing literature, the investigation explores the effects of key parameters thermal load, geometric factors, and volume fraction distribution on thermo-mechanical bending behavior. The study includes a thorough parametric analysis to identify significant factors impacting normal stresses and deflection of functionally graded plates. The findings offer valuable insights for designing functionally graded plates subjected to combined thermal and mechanical loads. With its simplicity and potential for future advancements, the suggested method proves highly suitable for addressing these problems.

JTAM, Sofia, vol. 0 Issue 0 pp. (999)