Machine mechanics and strength analysis
Description: The discipline studies the principles of movement and interaction of machine parts and mechanisms, as well as methods for analyzing and synthesizing their kinematic and dynamic characteristics. The main goal is to provide students with an understanding of the work of mechanisms, the calculation of loads, speeds and accelerations, as well as the design of machines taking into account their functional and operational requirements.
Amount of credits: 5
Пререквизиты:
- Physics
Course Workload:
| Types of classes | hours |
|---|---|
| Lectures | 15 |
| Practical works | 30 |
| Laboratory works | |
| SAWTG (Student Autonomous Work under Teacher Guidance) | 30 |
| SAW (Student autonomous work) | 75 |
| Form of final control | Exam |
| Final assessment method | written exam |
Component: University component
Cycle: Base disciplines
Goal
- Formation of students' understanding of the work of mechanisms, calculation of loads, speeds and accelerations, as well as the design of machines taking into account their functional and operational requirements.
Objective
- To study the basic laws and methods of engineering mechanics necessary for the analysis of motion, forces and loads in machine parts and assemblies. To form an understanding of the relationship between external influences and the mechanical behavior of materials, including deformations, stresses, fatigue phenomena and fracture. To master the methods of calculating static and dynamic loads acting on machine elements, taking into account the actual operating conditions and technological factors. To teach the application of methods of strength analysis, including classical analytical methods, diagrams, criteria of strength and stability.
Learning outcome: applying knowledge and understanding
- Upon completion of the discipline, the student should be able to apply theoretical knowledge and methods of engineering mechanics to solve practical problems of analyzing and designing machine parts and assemblies, namely: Perform calculations of internal forces, stresses, deformations and displacements of structural elements under various types of loads (tension/compression, bending, torsion, complex stress state). Use mechanical and strength criteria (Cod, Mises, Mohr, Soddy) to evaluate safe stresses and determine the limiting operating conditions of machine elements. To calculate static and dynamic loads, including cyclic and shock loads, taking into account the characteristics of real operating conditions and the environment.
Learning outcome: formation of judgments
- Upon completion of the discipline, the student should be able to form sound engineering conclusions and make technical decisions based on calculated data, theoretical models, regulatory requirements and safety principles, namely: Critically evaluate the results of strength calculations, identify possible sources of errors, assumptions and errors, as well as provide reasoned comments on the obtained values. Compare different structural solutions, analyzing their advantages and disadvantages from the standpoint of strength, rigidity, resource, mass, adaptability and economy. Assess the engineering risks associated with the choice of materials, shapes, sizes, and load conditions, and predict the possible consequences of failures and dangerous conditions.
Learning outcome: communicative abilities
- Upon completion of the discipline, the student should be able to effectively present, argue and discuss the results of engineering calculations, analyses and design solutions, namely: Present technical information competently and accurately, orally and in writing, using correct professional terminology, graphs, tables, calculation schemes and diagrams. Prepare and issue engineering reports, presentations, and explanatory notes that comply with established standards, norms, and requirements of the professional environment. Participate in professional discussions and team project work, demonstrating the ability to listen to colleagues, argue their position, correctly defend technical solutions and consider alternative approaches.
Learning outcome: learning skills or learning abilities
- Upon completion of the study of the discipline, the student must demonstrate the ability to independently acquire, update and apply professional knowledge, namely: Independently find, analyze, and critically evaluate educational, scientific, regulatory, and technical sources, databases, publications, and research results related to machine mechanics and strength analysis. Use modern digital tools and software training tools (modeling, simulators, FEM libraries, engineering knowledge bases) to expand competencies and perform calculations. The ability to identify their own knowledge gaps and form individual educational goals, adjusting the learning trajectory based on the results of self-assessment.
Teaching methods
1. Lecture-seminar-credit system; collaborative learning (teamwork, group work); information and communication technologies; technology of project-based learning; research method of teaching.
Assessment of the student's knowledge
Teacher oversees various tasks related to ongoing assessment and determines students' current performance twice during each academic period. Ratings 1 and 2 are formulated based on the outcomes of this ongoing assessment. The student's learning achievements are assessed using a 100-point scale, and the final grades P1 and P2 are calculated as the average of their ongoing performance evaluations. The teacher evaluates the student's work throughout the academic period in alignment with the assignment submission schedule for the discipline. The assessment system may incorporate a mix of written and oral, group and individual formats.
| Period | Type of task | Total |
|---|---|---|
| 1 rating | An individual assignment is given to each student for the rating. | 0-100 |
| 2 rating | An individual assignment is given to each student for the rating. | 0-100 |
| Total control | Exam | 0-100 |
The evaluating policy of learning outcomes by work type
| Type of task | 90-100 | 70-89 | 50-69 | 0-49 |
|---|---|---|---|---|
| Excellent | Good | Satisfactory | Unsatisfactory | |
| 2022 Academic Policy of the NAO "VKTU named after D. Serikbayev" | "Excellent" (90-100%) — the student has full knowledge, is able to apply theory to solve practical problems, performs calculations without errors, shows independence and initiative. | "Good" (70-89%) — the material has been sufficiently mastered, minor errors in calculations and conclusions have been made, the student is capable of independent work. | "Satisfactory" (50-69%) — knowledge is limited, mistakes are made when solving computational problems, and the help of a teacher is required. | "Excellent" (90-100%) — the student has full knowledge, is able to apply theory to solve practical problems, performs calculations without errors, shows independence and initiative. |
Evaluation form
The student's final grade in the course is calculated on a 100 point grading scale, it includes:
- 40% of the examination result;
- 60% of current control result.
The final grade is calculated by the formula:
| FG = 0,6 | MT1+MT2 | +0,4E |
| 2 |
Where Midterm 1, Midterm 2are digital equivalents of the grades of Midterm 1 and 2;
E is a digital equivalent of the exam grade.
Final alphabetical grade and its equivalent in points:
The letter grading system for students' academic achievements, corresponding to the numerical equivalent on a four-point scale:
| Alphabetical grade | Numerical value | Points (%) | Traditional grade |
|---|---|---|---|
| A | 4.0 | 95-100 | Excellent |
| A- | 3.67 | 90-94 | |
| B+ | 3.33 | 85-89 | Good |
| B | 3.0 | 80-84 | |
| B- | 2.67 | 75-79 | |
| C+ | 2.33 | 70-74 | |
| C | 2.0 | 65-69 | Satisfactory |
| C- | 1.67 | 60-64 | |
| D+ | 1.33 | 55-59 | |
| D | 1.0 | 50-54 | |
| FX | 0.5 | 25-49 | Unsatisfactory |
| F | 0 | 0-24 |
Topics of lectures
- Introduction to the discipline, its goals and objectives
- Fundamentals of theoretical and applied mechanics in machine engineering
- Materials in mechanical engineering and their mechanical properties: strength, ductility, viscosity, fatigue
- Types of loads and stress conditions of machine elements
- Methods for determining deformations and displacements in structural elements
- Calculation of tension, compression, bending and torsion
- Complex stress state and strength criteria (Cod, Mises, Pestilence, etc
- Fatigue strength and durability of machine parts
- Stability and stability of structural elements (loss of stability, critical force)
- Dynamics of machines: vibrations, shock loads and damping methods
- Calculation and analysis of connecting elements (bolted, welded, glued, keyed, spline)
- Strength analysis of gears and chain gears, shafts and axles
- Computational design methods: analytical, tabular and graphical methods
- Introduction to numerical methods of strength analysis (FEM)
- Optimizing the design of machine parts: increasing reliability, reducing weight and cost
Key reading
- Основы прочности материалов — Н.М. Беляев, Изд-во «Мир», 1979.
- Mechanics and Strength of Materials — V. Dias da Silva, Springer, 2006
- A Textbook of Strength of Materials — R.S. Khurmi, S.Chand Publishing, 2014.
- Теория механизмов и механика машин (8-е издание) — Гл. ред. коллектив. — Москва: [изд-во не указано], 2022. ISBN 978-5-7038-5775-4.
Further reading
- Колобов В. А., Калашников А. В. «Исчерпывающий справочник по прочности материалов». — Санкт-Петербург: Наука, 2008. — 576 с.
- Сафронов Е. В., Кузнецов И. Н. «Усталостная прочность деталей машин». — Москва: Машиностроение, 2002. — 412 с.
- Гуревич Г. М. «Деформирование и разрушение материалов». — Москва: Металлургия, 1986. — 445 с.
