International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Scientific methodologies have been created and applied during the analysis upon worm gear drives. Important parameters have been selected in order to make significant investigations in the area of worm gear efficiency and load capacity. The efficiency coefficient and maximal torque values have been studied for several combinations of modules, ratios, center distances, etc. The results have been presented and analysed through three-dimensional graphics. Conclusions are made.

The visualisation capabilities of the main software systems for computer-aided mathematics are reviewed. The advantages of the software system Matlab are described. The system is appropriate when visualization and analysis of engineering data are required. The author sets out to highlight the three-dimensional graphics and optimization synthesis of gear drives.

Gears are one of the most important machine elements in the industry. They are using many areas such as; automotive, energy, aviation, etc. Gears are exposed to higher loads day by day due to the increase in power and speed on the machines. Therefore, the stress values which are occur on the gear root is also increase. These stresses cause to damage on the teeth root. Thus the stress values have to be decrease to design optimum gear body. In this study, the effects of root radius on the gear bending stress are evaluated by using finite element method. At first, gears with standard root radius is investigated both DIN 3990 and finite element method. After the validation of finite element model, the root radius of the gear is taken as parameter. Gears with different root radiuses are analyzed by using finite element method. It is seen that with the increasement of gear tooth radiuses, the root stress is considerably decreased. With increasement of root radiuses the maximum principal stress reduced nearly 20%.

Adhesive joints are widely applied in transport engineering. Crack resistance is an important parameter determining the load capacity and durability of adhesive joints. The calculation-experimental method, which allows to raise the accuracy and reliability of an estimation of the crack resistance of the adhesive compositions is proposed. The proposed method can be implemented using a test station that ensures the loading of double cantilever glued beams by equal and oppositely directed moments. The mathematical model for determining the value of crack advancing energy, includes only one independent parameter (the bending moment) was obtained. It is established that change of geometrical parameters of the proposed experimental models slightly effects (less than 3.5 %) on value of crack advancing energy.