Course code LauZ3127

Credit points 3

Strength of Materials II

Total Hours in Course81

Number of hours for lectures8

Number of hours for seminars and practical classes16

Number of hours for laboratory classes8

Independent study hours49

Date of course confirmation07.02.2017

Responsible UnitInstitute of Mechanics and Design

Course developers

author prof.

Aivars Kaķītis

Dr. sc. ing.

author lect.

Mārtiņš Dauvarts

Bc. sc. ing.

Prior knowledge

Fizi2021, Physics I

LauZ3167, Strength of Materials I

Mate1029, Mathematics I

Mate1030, Mathematics II

Meha4008, Theoretical Mechanics I

Course abstract

The aim of the study course is to acquire basic knowledge about the strength of materials and methods of its determination, as well as about the methods of calculation of the basic elements of structures. In this part of the course, calculations of structural deformations, combined loads, statically indeterminate systems, buckling, dynamic and impact loads are mastered.

Learning outcomes and their assessment

Knowledge - students learn the principles of engineering calculations of strength, durability and deformation of materials and structures. Assessment of knowledge - tests and defense of individual works.
Skills - are able to creatively use the principles and methods and techniques of material resistance in the calculation of strength, stability and deformation of engineering structures. Assessment - defense of individual and laboratory works.

Competence - are able to independently solve engineering problems, create calculation schemes for real structures and perform the necessary calculations for equipment design work. Assessment - defense of individual and laboratory works.

Course Content(Calendar)

1. Energy methods shall be used to calculate elastic displacement (2h L, 2h PrD; 4h PstD)
2. Mora integral, its use in deformation calculations (2h PrD; 4h PstD)
3. Vereshchagin method, its use in deformation calculations (2h PrD; 4h PstD)
4. Determination of elastic displacements (2h LabD; 2h PstD), (1. Laboratory work).
5. Calculation of elastic displacements (2h PstD) (Test 1).
6. Compound loads. Quick bend. Calculations of stresses and strains (2h L, 2h PrD; 4h PstD)
7. Determination of deformations in crooked bending (2h LabD; 2h PstD) (2. Laboratory work)
8. Compound loads. Eccentric juicer. The core of the slice (1h L, 2h PrD; 4h PstD)
9. Determination of stress state in eccentric pressure (2h PrD; 4h PstD) (Test 2)
10. Statically indeterminate systems. The canonical equations of the force method. Many times statically indeterminate tasks (1h L, 2h PrD; 4h PstD)
11. Statically indeterminate systems (2h PstD) (Test 3)
12. Load on the ladder. Euler's formula for determining critical force, its use. Coefficient φ method for determining the dimensions of a bar in a lattice (2h L, 1h PrD; 4h PstD)
13. Research of the buckling process (4h LabD; 4h PstD) (3. Laboratory work)

14. Evaluation of inertial forces in calculations. Dynamic and impact loads. Material fatigue. Durability calculations (1h PrD; 4h PstD)

Requirements for awarding credit points

The course ends with an exam. In order to pass the exam, independent work and laboratory works must be defended and tests must be written.

Description of the organization and tasks of students’ independent work

During the independent work students study in depth the topics discussed in the lectures and perform independent work:
1. Independent work: Calculate the bending deformation of the beam at a given point using two methods.
2. Independent work: Calculate the dimensions of the drive shaft under load bending + torsion.
3. Independent work: Calculate once statically indeterminate flat frame strength.

4. Independent work: Calculate the strength of the beam in buckling.

Criteria for Evaluating Learning Outcomes

The student explains the calculation process and justifies it with the principles of theory.

Compulsory reading

1. Ziemelis I., Kaķītis A., Dominieks L. Materiālu pretestība. Jelgava: LLU, 2008. 376 lpp.

2. Hibbeler R. Statics and Mechanics of Materials. 5th edition. Pearson, 2016. 936 p.

Further reading

1. Lavendelis E. Materiālu pretestība. Rīga: Zvaigzne, 1986. 341 lpp.

2. Auzukalns J. Materiālu pretestība uzdevumos. Rīga: Zvaigzne, 1973. 742 lpp.

Periodicals and other sources

1. Gere J. M. Mechanics of Materials. 6th ed. [tiešsaiste] [skatīts 13.12.2020.]. Pieejams: https://docs.google.com/file/d/0B-fBr8ucz0m4ZGRmdy1yckZXSWM/edit

Notes

The study course is included in the Compulsory part of the Bachelor’s study program “Agricultural Engineering”. 3rd study year 5th semester.