CTC / MTC 222 Strength of Materials Review Chapters 1 - 3

Test #1 – 10/18/11 20% of grade Open book plus two sheets of notes Graded on the basis of 20 points in increments of ½ point Open book plus two sheets of notes Equations, definitions, procedures, no worked examples Work problems on separate sheets of engineering paper Hand in test paper, answer sheets and notes stapled to back of answer sheets Will allow 2 hours

Course Objectives To provide students with the necessary tools and knowledge to analyze forces, stresses, strains, and deformations in mechanical and structural components. To help students understand how the properties of materials relate the applied loads to the corresponding strains and deformations.

Chapter One – Basic Concepts SI metric unit system and U.S. Customary unit system Unit conversions Basic definitions Mass and weight Stress, direct normal stress, direct shear stress and bearing stress Single shear and double shear Strain, normal strain and shearing strain Poisson’s ratio, modulus of elasticity in tension and modulus of elasticity in shear

Chapter Two – Design Properties Basic Definitions Yield point, ultimate strength, proportional limit, and elastic limit Modulus of elasticity and how it relates strain to stress Hooke’s Law Ductility - ductile material, brittle material

Chapter Three – Direct Stress Basic Definitions Design stress and design factor Understand the relationship between yield stress and design stress, allowable stress or working stress Understand the relationship between design factor, factor of safety and margin of safety Design / analyze members subject to direct stress Normal stress – tension or compression, tensile stress on gross area, tensile stress on net area Shear stress – shear stress on a surface, single shear and double shear on fasteners Bearing stress – bearing stress between two surfaces, bearing stress on a fastener

Chapter Three – Axial Deformation and Thermal Stress Elastic deformation of a member due to an axial load Design axially loaded members to limit their deformation Define coefficient of thermal expansion Thermal deformation due to temperature change if a member is unrestrained Thermal stress in a member due to temperature change if the member is restrained Stress in components of a composite structure made of more than one material