2009+2-ForceVectors - 2009-5-9 Introduction to Solid...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
2009-5-9 1 SJTU Introduction to Solid Mechanics -Vm211 Response of a body under action of external forces Study by dynamics Motion---its spatial position varies with time, external effect of forces 1 F ω Chapter 1 Introduction SJTU Introduction to Solid Mechanics -Vm211 There is a deformation of the body, that is, its shape and size of a body changes, so call it a deformable body 2 loading Chapter 1 Introduction SJTU Introduction to Solid Mechanics -Vm211 Three fundamental principles Under action of external forces , internal forces appear inside of a deformable body , all forces have to satisfy the equilibrium condition 1 Deformation of the body has to satisfy geometric and compatible relations 2 Relation between forces and deformation-physical relation found from experiments 3 Chapter1 Introduction SJTU Introduction to Solid Mechanics -Vm211 Chapter 1 Introduction F D σ ε SJTU Introduction to Solid Mechanics -Vm211 Chapter 1 Introduction Equilibrium Equation Compatibility Equation Hooke’s Law F D σ ε Three fundamental principles SJTU Introduction to Solid Mechanics -Vm211 When a body deforms with loading, points where external forces act on have certain displacements, so an amount of work is done, equal deformation energy is stored in the body Material test study its failure mechanism, get its mechanical behavior Member test: measure response of a real member, check its theoretic results Energy principle - Lagrange Experiment method From energy principle, an efficient method is found to solve forces, deformation and displacement of the body Under certain conditions, energy principle is equivalent to three fundamental principles ) Chapter 1 Introduction
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2009-5-9 2 SJTU Introduction to Solid Mechanics -Vm211 1 Due to excessive loading, it ruptures and loses its ability to sustain forces Chapter 1 Introduction Three forms of failure for a member: SJTU Introduction to Solid Mechanics -Vm211 A slender column or a member with thin walls can not keep a stable equilibrium state and lose its ability to bear loading 3 Chapter 1 Introduction Due to undue deformation, it can not normally work 2 Lathe cutting SJTU Introduction to Solid Mechanics -Vm211 Chapter 1 Introduction Its ability to resist excessive deformation is called its stiffness Ability of a member to resist external forces without
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/09/2011 for the course EE 211 taught by Professor Liuxila during the Summer '09 term at Shanghai Jiao Tong University.

Page1 / 6

2009+2-ForceVectors - 2009-5-9 Introduction to Solid...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online