Course code Meha4002

Credit points 2

Total Hours in Course80

Number of hours for lectures16

Number of hours for seminars and practical classes16

Independent study hours48

Date of course confirmation06.04.2021

Responsible UnitInstitute of Mechanics

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## Māris Gailis

Ph.D.

Students will acquire knowledge on durability, stiffness and stability of materials for calculation of constructions a, develop engineering perception, supporting on the theory they study to put into practice the substantiation of optimal structural design of constructions of food production machinery.

Knowledge - students comprehend the basic principles of engineering calculation on strength, stability and deformation of materials and constructions – interactive tests and two tests.

Skills - using the methods and modes of the strength of materials students are able to perform practical calculations on strength, stability and deformation of engineering constructions – practical works.

Competence - students are able to solve technical problems and perform independent calculation and selection of appropriate machinery for food processing – 3 homeworks.

1. Introduction. Equivalent and balanced systems of forces. Supports and reactions. Interactive test. (Lectures – 2h, practical work – 2h)

2. Geometric parameters of cross section. (Lectures – 1h, practice – 1h)

3. Method of cross section. Diagrams of internal forces. (Lectures – 1h, practical work – 1h)

4. Stresses. Tension, Diagram of stress-strain for plastic and brittle materials. Interactive test. (Lectures – 2h, practical work – 2h)

5. Surface load. Permissible stress. (Lectures – 1h, practical work – 1h)

6. Stresses in tension. 1st test. (Lectures – 1h, practical work– 1h)

7. Shearing load. (Lectures – 1h, practical work – 1h)

8. Torsion load. Torsion in round bars. (Lectures – 2h, practical work – 2h)

9. Bending load. Normal stress in bending. Interactive test. (Lectures – 1h, practical work – 1h,)

10. Tangential stress in bending. Calculation of strength. 2nd test. (Lectures – 2h, practical work – 2h)

11. Theories of strength. (Lectures – 2h, practical work – 2h)

Course assessment with a mark is formed follows:

• all homework must be submitted and successfully graded. The homeworks include mechanical load and strength problem solving (40%)

• all interactive tests must be submitted and successfully graded. The tests include multichoice, numerical, interaction via text and figures in the environments of Moodle and Kahoot. Grading in Moodle is automated(20%)

• two classroom tests must be written and successfully graded (40%).

The problems for independent work are similar to the ones given during practice work. The problem starts with statement of initial parameters. To solve the problem, application of the skills obtained during practice is necessary.

The test with a mark is formed as the weighted mean of the results of interactive tests, homeworks, and classroom tests.

Meriam J.L., Kraige L.G. Engineering Mechanics. Statics. New York: John Wiley & Sons, 2001. 512 p.

Meriam J.L., Kraige L.G. Engineering Mechanics. Dynamics. New York: John Wiley & Sons, 2003. 744 p.

Hibbeler R.C. Statics and mechanics of materials. Singapore: Prentice Hall, 2004. 792 p.

Compulsory course for students of the second-level professional higher education study program "Food Technology"