Mechanics of materials, Brief SI EditionCengage Learning (2012) Sách viết bằng tiếng Anh, cung cấp các kiến thức mới nhất về lĩnh vực Cơ Học. Rất hữu ích cho ngành Cơ học vật rắn biến dạng, sức bền vật liệu, vật liệu kỹ thuật,... Sách được nhiều trường kỹ thuật tin dùng và sử dụng File này gồm đủ trang, chất lượng HD và nhìn rõ nét nhất
PRINCIPAL UNITS USED IN MECHANICS International System (SI) Quantity Unit Symbol Formula Acceleration (angular) radian per second squared rad/s2 Acceleration (linear) meter per second squared m/s2 Area square meter m2 Density (mass) (Specific mass) kilogram per cubic meter kg/m3 Density (weight) (Specific weight) newton per cubic meter N/m3 Energy; work joule J N⭈m Force newton N kg⭈m/s2 Force per unit length (Intensity of force) newton per meter Frequency hertz Hz s⫺1 Length meter m (base unit) Mass kilogram kg (base unit) N/m Moment of a force; torque newton meter N⭈m Moment of inertia (area) meter to fourth power m4 Moment of inertia (mass) kilogram meter squared kg⭈m2 Power watt W J/s (N⭈m/s) Pressure pascal Pa N/m2 Section modulus meter to third power Stress pascal Pa N/m2 Time second s (base unit) Velocity (angular) radian per second rad/s Velocity (linear) meter per second m/s Volume (liquids) liter Volume (solids) cubic meter m3 L 10⫺3 m3 m3 SELECTED PHYSICAL PROPERTIES Property SI Water (fresh) weight density mass density 9.81 kN/m3 1000 kg/m3 Sea water weight density mass density 10.0 kN/m3 1020 kg/m3 Aluminum (structural alloys) weight density mass density 28 kN/m3 2800 kg/m3 Steel weight density mass density 77.0 kN/m3 7850 kg/m3 Reinforced concrete weight density mass density 24 kN/m3 2400 kg/m3 Atmospheric pressure (sea level) Recommended value Standard international value 101 kPa 101.325 kPa Acceleration of gravity (sea level, approx 45° latitude) Recommended value Standard international value 9.81 m/s2 9.80665 m/s2 SI PREFIXES Prefix tera giga mega kilo hecto deka deci centi milli micro nano pico Symbol T G M k h da d c m n p Multiplication factor 1012 109 106 103 102 101 10⫺1 10⫺2 10⫺3 10⫺6 10⫺9 10⫺12 ⫽ 000 000 000 000 ⫽ 000 000 000 ⫽ 000 000 ⫽ 000 ⫽ 100 ⫽ 10 ⫽ 0.1 ⫽ 0.01 ⫽ 0.001 ⫽ 0.000 001 ⫽ 0.000 000 001 ⫽ 0.000 000 000 001 Note: The use of the prefixes hecto, deka, deci, and centi is not recommended in SI This is an electronic version of the print textbook Due to electronic rights restrictions, some third party content may be suppressed Editorial review has deemed that any suppressed content does not materially affect the overall learning experience The publisher reserves the right to remove content from this title at any time if subsequent rights restrictions require it For valuable information on pricing, previous editions, changes to current editions, and alternate formats, please visit www.cengage.com/highered to search by ISBN#, author, title, or keyword for materials in your areas of interest Mechanics of Materials BRIEF EDITION, SI This page intentionally left blank Mechanics of Materials BRIEF EDITION, SI James M Gere Late Professor Emeritus, Stanford University Barry J Goodno Georgia Institute of Technology Australia • Brazil • Japan • Korea • Mexico • Singapore • Spain • United Kingdom • United States Mechanics of Materials, Brief Edition, SI James M Gere and Barry J Goodno Publisher, Global Engineering: Christopher M Shortt Acquisitions Editor: Randall Adams Senior Developmental Editor: Hilda Gowans Editorial Assistant: Tanya Altieri Team Assistant: Carly Rizzo Marketing Manager: Lauren Betsos Media Editor: Chris Valentine Content Project Manager: Jennifer Ziegler Production Service: RPK Editorial Services Copyeditor: Shelly Gerger-Knechtl Proofreader: Martha McMaster Indexer: Shelly Gerger-Knechtl Compositor: Integra Software Solutions © 2012 Cengage Learning ALL RIGHTS RESERVED No part of this work covered by the copyright herein may be reproduced, transmitted, stored or used in any form or by any means graphic, electronic, or mechanical, including but not limited to photocopying, recording, scanning, digitizing, taping, Web distribution, information networks, or information storage and retrieval systems, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without the prior written permission of the publisherexcept as may be permitted by the license terms below For product information and technology assistance, contact us at Cengage Learning Academic Resource Center, 1-800-423-0563 For permission to use material from this text or product, submit all requests online at www.cengage.com/permissions Further permissions questions can be emailed to permissionrequest@cengage.com Senior Art Director: Michelle Kunkler Internal Designer: Peter Papayanakis Library of Congress Control Number: 2011924094 Cover Designer: Andrew Adams/4065042 Canada Inc ISBN-13: 978-1-111-13603-1 Cover Images: © iPhotos/Shutterstock Text and Image Permissions Researcher: Kristiina Paul First Print Buyer: Arethea L Thomas ISBN-10: 1-111-13603-3 Cengage Learning 200 First Stamford Place, Suite 400 Stamford, CT 06902 USA Cengage Learning is a leading provider of customized learning solutions with office locations around the globe, including Singapore, the United Kingdom, Australia, Mexico, Brazil, and Japan Locate your local office at: international.cengage.com/region Cengage Learning products are represented in Canada by Nelson Education Ltd For your course and learning solutions, visit www.cengage.com/engineering Purchase any of our products at your local college store or at our preferred online store www.cengagebrain.com Printed in Canada 13 12 11 Contents James Monroe Gere ix Preface—Brief Edition, SI x Symbols xvi Greek Alphabet xix Tension, Compression, and Shear 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Introduction to Mechanics of Materials Normal Stress and Strain Mechanical Properties of Materials 15 Elasticity, Plasticity, and Creep 24 Linear Elasticity, Hooke’s Law, and Poisson’s Ratio 27 Shear Stress and Strain 32 Allowable Stresses and Allowable Loads 43 Design for Axial Loads and Direct Shear 49 Chapter Summary & Review 55 Problems 57 Axially Loaded Members 89 2.1 2.2 2.3 2.4 2.5 2.6 3 Torsion Introduction 90 Changes in Lengths of Axially Loaded Members 90 Changes in Lengths Under Nonuniform Conditions 99 Statically Indeterminate Structures 106 Thermal Effects, Misfits, and Prestrains 115 Stresses on Inclined Sections 127 Chapter Summary & Review 139 Problems 141 169 3.1 3.2 3.3 Introduction 170 Torsional Deformations of a Circular Bar 171 Circular Bars of Linearly Elastic Materials 174 v vi CONTENTS 3.4 3.5 3.6 3.7 3.8 Shear Forces and Bending Moments 233 4.1 4.2 4.3 4.4 4.5 Introduction 234 Types of Beams, Loads, and Reactions 234 Shear Forces and Bending Moments 239 Relationships Between Loads, Shear Forces, and Bending Moments 248 Shear-Force and Bending-Moment Diagrams 253 Chapter Summary & Review 264 Problems 266 Stresses in Beams 279 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 Nonuniform Torsion 186 Stresses and Strains in Pure Shear 193 Relationship Between Moduli of Elasticity E and G 200 Transmission of Power by Circular Shafts 202 Statically Indeterminate Torsional Members 207 Chapter Summary & Review 211 Problems 213 Introduction 281 Pure Bending and Nonuniform Bending 281 Curvature of a Beam 282 Longitudinal Strains in Beams 284 Normal Stresses in Beams (Linearly Elastic Materials) 289 Design of Beams for Bending Stresses 302 Shear Stresses in Beams of Rectangular Cross Section 311 Shear Stresses in Beams of Circular Cross Section 321 Shear Stresses in the Webs of Beams with Flanges 324 Composite Beams 332 Chapter Summary & Review 347 Problems 350 Analysis of Stress and Strain 377 6.1 6.2 6.3 6.4 6.5 6.6 Introduction 379 Plane Stress 380 Principal Stresses and Maximum Shear Stresses 388 Mohr’s Circle for Plane Stress 398 Hooke’s Law for Plane Stress 415 Triaxial Stress 418 Chapter Summary & Review 422 Problems 425