Strength of materials - Chapter 1: Basic concepts - Nguyễn Sỹ Lâm

1.1 BASIC CONCEPTS OF STRENGTH OF
MATERIALS COURSE
What is “MECHANICS OF MATERIALS” (SBVL là gì) ?
• Mechanics of Materials is a branch of Applied Mechanics that
deals with the behavior of DEFORMABLE solid bodies subject to
various types of loading.
• Other names:
Strength of Materials
Mechanics of Deformable Bodies
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  1. STRENGTH OF MATERIALS, COURSE CODE: INTRODUCTION: 2016 • Lecturers: Dr. Lam Nguyen-Sy (Nguyễn Sỹ Lâm), B6, Civil Eng Building Email: lamns@hcmut.edu.vn, Phone: 0916511973 • Lectures: Monday pm – pm, Room 304 H2 - 205H2 Building Friday pm – pm, Room 403 H2 • Consultation: (1) try your peer students, (2) then try your tutor, (3) then Lecturers (room , Tuesday - pm & Wednesday - pm)
  2. AIMS The subject aims: - To equip the student with essential knowledge about external and internal forces occurring in simple structural elements under the action of various types of loadings. - To understand the determination of the stresses, strains and displacements produced by the loads. - To furnish an understanding of the mechanical behavior of materials, which is essential for the safe design of all structures in civil and mechanical engineering.
  3. LEARNING EXPECTATIONS A DAM: WHAT IS THE BASIC PRINCIPLE OF ITS STRUCTURE?
  4. LEARNING EXPECTATIONS A BRIDGE: WHY DOES IT HAVE THIS SHAPE? FOR BEAUTY OR ANYTHING ELSE?
  5. LEARNING EXPECTATIONS SOME BRIDGE MODELS: ANY GENERAL PRINCIPLES?
  6. LEARNING EXPECTATIONS At the end of this course, the student should be able to: • Knowledge - Draw the diagrams of internal forces: axial force, shear force, bending moment - Analysis of stresses, displacements of simple structures - Identify of mechanical properties of materials. - Analysis of stability of simple structures • Skills - Model from the real structures to analytical models - Extend in the professional courses - Explaining your works effectively in writing. THIS COURSE PROVIDES THE VERY FIRST BASE OF ALL CIVIL ENGINEERS, MECH. ENGINEERS – LIKE CHILDREN LEARN HOW TO SPELL.
  7. COURSE OUTLINE Section Content Tasks/Milestone Begins with a review of the fundamental concepts and assumptions and the 1 importance of satisfying equilibrium 2 Theory of internal forces is described Analysis of normal stress in axial loaded members and discussion of some of the 3 mechanical properties are given 4 Concept of state of stress and the relations of stresses and strains are presented 5 Application of various theories of failure are presented 6 Geometric properties of cross sections are presented 7 Bending problem in-plane, stress-strain relationship, ultimate stress 8 Displacements of beams under bending moments 9 Torsion problems Assignment 1 due 10 Combined forces problems 11 Stability problems 12 Final Exam.
  8. CHAPTER 1: BASIC CONCEPTS 1.1 BASIC CONCEPTS OF STRENGTH OF MATERIALS COURSE 1.2 ENGINEERING SHAPES 1.3 EXTERNAL FORCES – SUPPORTS/CONNECTION – REACTION FORCES 1.4 BASIC OF FORCE – DEFORMATION STYLES 1.5 HYPOTHESES
  9. 1.1 BASIC CONCEPTS OF STRENGTH OF MATERIALS COURSE What is “MECHANICS OF MATERIALS”? • Mechanics of Materials is a branch of Mechanics that develops relationships between the external loads (ngoại lực) applied to a deformable body (vật thể biến dạng được) and the internal forces (nội lực) acting within the body.
  10. 1.2 ENGINEERING SHAPES (1) SOLID
  11. 1.2 ENGINEERING SHAPES Gravity dam and its structure
  12. 1.2 ENGINEERING SHAPES SHELL
  13. 1.2 ENGINEERING SHAPES (3) BAR FRAME STRAIGHT BAR DOME
  14. 1.3 EXTERNAL FORCES – SUPPORTS - REACTIONS 1.3.1 External forces
  15. • If an x,y,z cordinate system is established F 0 F 0 F 0 x  yz  Mx 0  M yz 0  M 0 • With planar problems Fx 0;  F y 0;  M o 0
  16. 1.4 BASIC FORCES – DEFORMATION STYLES Axial
  17. 1.4 BASIC FORCES – DEFORMATION STYLES Shear Single Shear Double Shear P F P F ave  A A ave A 2A
  18. 1.4 BASIC FORCES – DEFORMATION STYLES Shear strain
  19. 1.5 BASIC HYPOTHESES Linear Elastic