Course detail

# Strength of Materials I

Basic concepts and problems of strength analysis. Basic mechanical properties of material. Concepts of stress and strain. General theorems of linear elasticity. Definition and classification of bar and beam as the simplest model of a body. Bar under simple loading - tension / compression, torsion; bending of beams. Basic limit states of ductile and brittle materials under static loading. Safety conditions. Beams and bars under combined loading. Stability of compressed bars.

Language of instruction

Czech

Number of ECTS credits

7

Mode of study

Not applicable.

Learning outcomes of the course unit

Basic knowledge of stress and strain related to simple cases of loaded bars and beams and the idea of the boundaries of applicability of these classical approaches. Criteria of fundamental limit states and determination of safety and dimensions of designed bodies or machine parts.

Prerequisites

Basic knowledge of statics and mathematics. Statics - conditions of static equilibrium and equivalence, free-body diagrams, assessment of static determinacy, shear force and bending moment diagrams. Mathematics - vectors and matrices, differential and integral calculus, solutions to differential equations. Knowledge of the software Matlab.

Co-requisites

Not applicable.

Planned learning activities and teaching methods

The course is taught through lectures explaining the basic principles and theory of the discipline. Exercises are focused on practical topics presented in lectures.

Assesment methods and criteria linked to learning outcomes

The course-unit credit is granted under the condition of active participation in seminars and passing the seminar tests of basic knowledge (at least 10 ECTS points out of 20 must be gained). The points gained in seminar tests are included in the final course evaluation.
Final examination: Written part of the examination plays a decisive role, where the maximum of 80 ECTS points can be reached. Solution of several computational problems is demanded. The problems come from typical profile areas of given subject and supplied by a theoretical question, proof, etc. The lecturer will specify exact demands like the number and types problems during the semester preceding the examination.
Final evaluation of the course is obtained as the sum of ECTS points gained in seminars and at the examination. To pass the course, at least 50 points must be reached.

Course curriculum

Not applicable.

Work placements

Not applicable.

Aims

The objective of the course Strength Analysis I is to equip the students with methodology for determination of strain and stress in bodies and risk assessment of basic limit states. Practical experience with computations of the simplest bodies will be further supplemented with basic knowledge necessary for the strength design of real machine parts.

Specification of controlled education, way of implementation and compensation for absences

Attendance at practical training is obligatory. Head of seminars carry out continuous monitoring of student's presence, their activities and basic knowledge.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

Gere, J.M., Timoshenko, S.P.: Mechanics of Materials, third SI edition, Chapman & Hall, London, Glasgow, New York, 1995
Pestel, E., Wittenburg, J.: Technische Mechanik, Band 2: Festigkeitslehre, B I, Wissenschaftsverlag, Mannheim, Leipzig, Wien, Zűrich, 1992
Hoschl, C.: Pružnost a pevnost ve strojírenství, SNTL, Praha, 1971

Not applicable.

eLearning

Classification of course in study plans

• Programme B-ENE-P Bachelor's, 2. year of study, winter semester, compulsory

• Programme B-STR-P Bachelor's

specialization AIŘ , 2. year of study, winter semester, compulsory
specialization SSZ , 2. year of study, winter semester, compulsory
specialization STG , 2. year of study, winter semester, compulsory
specialization KSB , 2. year of study, winter semester, compulsory

• Programme B3A-P Bachelor's

branch B-MTI , 3. year of study, winter semester, compulsory

#### Type of course unit

Lecture

52 hours, optionally

Teacher / Lecturer

Syllabus

Definition of subject contents. Basic terms – deformation, stress, stress state, limit states, safety.

Mechanical properties of material and its computational models. Characteristics of linear elastic body. Definition of linear strength of materials.

Work done by forces, Castigliano's theorem. Saint -Venant's principle. Beam in strength of materials – definition, classification.

Geometrical characteristics of cross-section. Area moments of inertia, transformation with respect to the translated and rotated axes. Principal central area moments of inertia.

- Deformation, stress state and strain energy.
- Influence of deviations on deformation and stress state, notches and safety check.
- Statically indeterminate beam loaded in tension and compression.
- Truss structures and trusses.

Bars in torsion:
- Deformation, stress state, strain energy and influence of deviations on deformation and stress state.
- Statically indeterminate beam and safety check.

Beams in bending:
- Stress state, deformation, strain energy. Methods of determination of deflection.
- Influence of deviations on stress state and deformation. Shear stress resulting from shear force. Safety check.
- Statically indeterminate beam.
- Initially curved beams in bending, frames.
- Shear stress for thin-walled profiles, shear center.

Stability of columns. Influence of deviations on the critical load.

Stability of columns from real material. Eccentric compression.

Stress state in the point of a body, principal stresses.

Representation of stress state using Mohr's circle. Particular cases of stress state, plane stress state.

Criteria for materials of bodies in ductile or brittle state without a priori defects of the crack type at static loading.

Beams loaded by temperature. Non-linearity in bending.

Overview of problems solvable by analytical and numerical methods.

Eurocodes - Design of steel structures.

Examples of possibilities of contemporary methods of experimental strength of materials.

Guided consultation

26 hours, optionally

Teacher / Lecturer

Syllabus

Facultative tutorials will be dedicated to individual questions, discussions and possible application enhancement of the topics, presented in the time-schedule of lectures and seminars. Direct link to the time schedule of seminars is supposed.

Exercise

12 hours, compulsory

Teacher / Lecturer

Syllabus

Internal forces and moments for straight bar.
Internal forces and moments for curved beam and frame.
Area moments of inertia. Mohr's circle.
Curved beams and frames. Closed beams (frames). Utilization of symmetry and antimetry.
Stability of columns. Safety for compressive loading of bars from real material.
Calculation of trusses considering the stability of columns. Truss structures.

Computer-assisted exercise

14 hours, compulsory

Teacher / Lecturer

Syllabus

Internal forces and moments for straight bar.
Internal forces and moments for curved beam and frame.
Area moments of inertia. Mohr's circle.