Machine Elements 3

• Semester 5, position 5

Completion and upgrade of the knowledge discussed in the obligatory subjects Machine elements 1 and 2. The objectives are: a more detailed and accurate calculations of strength, safety and load capacity of machine parts, in general and the specific mechanical elements contained in the course: springs, welded, soldered, glued and riveted joints, residual stresses, pressure vessels and sealing, Recycling. Their use enables the students to run engineering project tasks with increased reliability and safety.

After attended course, students gain knowledge about: •Identify, select and calculate the springs, •Apply and calculate the capacity of inherent joints (welded, soldered, glued and riveted), •Residual stresses, •choose and calculate a threaded power transmissions, •identify and calculatr а residual stresses, •calculate housing under pressure, •identify and choose the sealing of fixed and movable surfaces, •importance of recycling.

First, based on previously acquired knowledge from several obligatory subjects (Mechanical еngineering мaterials, Resistance of materials, Machine elements 1 and 2), as well as complement in this necessary field, students study the more detailed calculations of strength, safety, load capacity and life of machine elements which are presented only particular or in reduced extent in the subjects Machine elements 1 and 2. On this basis, the issues which was only partial and insufficient considered in the program of Machine elements 1 and 2, are studied at a higher level. This continues further with the study of machine parts and elements that are not enough considered in these two subjects, such as: elastic elements - springs, pipes and pressure vessels, their linking and joints with other relevant elements, as flanged connections and sealing compounds. As a special inseparable joints are considered such as welded, riveted, soldered and adhesive joints. Occurrence explanation and residual stresses basic calculation. Prototyping and 3D printing.

Supplemented calculations examples of increased load capacity and determining the safety factor by static and dynamic loads. Application of these calculations to the specific machine elements contained in this subject, such as: piping, pressure vessels and their connections, flange sealing elements, elastic elements - springs, and discussed examples of mechanical joints. More detailed calculations of threaded power transmission. Prototyping and 3D printing. Project tasks with instructions for preparation.

Attended and passed courses: Machine elements 1 and Engineering materials 1 and 2; attending (passed) course: Machine elements 2.

Book available in bookshop. Laboratory with exhibited specimens of machine parts and constructions. Smart board. 3D printer.

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 5
Laboratory exercises: 5
Calculation tasks: 12
Seminar paper: 0
Project: 5
Consultations: 0
Discussion/workshop: 3
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 1
Review and grading of seminar papers: 0
Review and grading of the project: 1
Test: 6
Test: 4
Final exam: 3

Activity during lectures: 5
Test/test: 40
Laboratory practice: 10
Calculation tasks: 0
Seminar paper: 0
Project: 15
Final exam: 30
Requirement for taking the exam (required number of points): 30

Ognjanovic, М.: Machine elements, - Faculty of Mechanical Engineering, 4. Edition, Belgrade 2021.; Stamenic, Z.: Power point course presentations (//http://omk.mas.bg.ac.rs), 2024.; Krsmanovic, V., Mitrovic, R.: Sliding and rolling bearings, Zavod za udzbenike and Faculty of Mechanical Engineering, Belgrade 2015.; Plavšić, N., Janković M., Ristivojević, M., Mitrović, R., Rosić, B., Obradović, P.: Machine Elements-collection of solved problems, Faculty of Mechanical Engineering, Belgrade 2017.; Shigley, Ј.: Machine Design, 3. Edition, 2012.