Projeto de Máquinas 3 Ed - Solução

Executive Editor: Eric Svendsen\nExecutive Managing Editor: Vince O'Brien\nManaging Editor: David A. George\nProduction Editor/Cover Designer: Scott Disanno\nManufacturing Buyer: Lisa McDowell\n\n© 2006 by Pearson Education, Inc.\nPearson Prentice Hall\nPearson Education, Inc.\nUpper Saddle River, NJ 07458\n\nAll rights reserved. No part of this book may be reproduced in any form or by any means, without permission in writing from the publisher.\n\nThe author and publisher of this book have used their best efforts in preparing this book. These efforts include the development, research, and testing of the theories and programs to determine their effectiveness. The author and publisher make no warranty of any kind, expressed or implied, with regard to these programs or the documentation contained in this book. The author and publisher shall not be liable in any event for incidental or consequential damages in connection with, or arising out of, the furnishing, performance, or use of these programs.\n\nPearson Prentice Hall™ is a trademark of Pearson Education, Inc.\n\nThis work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students except by instructors using the accompanying text in their classes. All recipients of this work are expected to abide by these restrictions and to honor the intended pedagogical purposes and the needs of other instructors who rely on those materials.\n\nPrinted in the United States of America\n10 9 8 7 6 5 4 3 2 1\n\nISBN 0-13-146312-9\n\nPearson Education Ltd., London\nPearson Education Australia Pty. Ltd., Sydney\nPearson Education Singapore, Pte. Ltd.\nPearson Education North Asia Ltd., Hong Kong\nPearson Education Canada, Inc., Toronto\nPearson Educacion de Mexico, S.A. de C.V.\nPearson Education—Japan, Tokyo\nPearson Education Malaysia, Pte. Ltd.\nPearson Education, Inc., Upper Saddle River, New Jersey Contents\nPreface _________ iv\nChapter 1 Solutions for Introduction to Design ________ 1\nChapter 2 Solutions for Materials and Processes ________ 19\nChapter 3 Solutions for Load Determination ________ 63\nAnswers to multi-problem stems ________ 155\nChapter 4 Solutions for Stress, Strain and Deflection ________ 157\nAnswers to multi-problem stems ________ 299\nChapter 5 Solutions for Static Failure Theories ________ 307\nAnswers to multi-problem stems ________ 418\nChapter 6 Solutions for Fatigue Failure Theories ________ 421\nAnswers to multi-problem stems ________ 548\nChapter 7 Solutions for Surface Failure ________ 623\nAnswers to multi-problem stems ________ 723\nChapter 8 Solutions for Shafts, Keys, and Couplings ________ 727\nAnswers to multi-problem stems ________ 797\nChapter 9 Solutions for Bearings and Lubrication ________ 805\nChapter 10 Solutions for Spur Gears ________ 921\nChapter 11 Solutions for Helical, Bevel, and Worm Gears ________ 1031\nChapter 12 Solutions for Spring Design ________ 1135\nChapter 13 Solutions for Screws and Fasteners ________ 1219\nAnswers to multi-problem stems ________ 1221\nChapter 14 Solutions for Clutches and Brakes ________ 1221\nAnswers to multi-problem stems ________ 1272 SOLUTIONS MANUAL\nThomas A. Cook\nMACHINE DESIGN\nAN INTEGRATED APPROACH\nTHIRD EDITION\n\nRobert L. Norton\n\nPEARSON\nPrentice Hall Preface to the Solutions Manual\n\nThis manual contains 350 problem solutions in 14 chapters. Ninety-eight of the problem stems refer to tables containing multiple sets of input data that provide up to 14 variants on the same problem. When chapter two is included, there are 1,339 problems available for assignment (not including the projects in Chapters 3, 8, 11, and 14). Solutions for the first five chapters of multi-problem items are included in the printed manuals. Tables of answers to the remaining problems are then printed in an appendix at the end of each chapter in which there are multi-problem stems. Match solutions to all 1,339 problems are available on the publisher’s website (password provided) at:\n\nhttp://www.proghall.com\n\nTo download these files, choose the Instructor’s Support option to register as an instructor and follow the instructions on the site. This computerized approach to providing solutions has significant advantages to the instructor, who can easily change any assigned problem’s data and instantly solve it. Thus, an essentially infinite supply of problems is easily solvable, going far beyond those offered in the text.\n\nThe solutions derive from the textbook Machid 11. The solutions that are in the manual are printed directly from Manual-lode loading. To view and print the problem solutions, you must have Machid 11 at the feet running on your computer. The files can be used to easily and quickly check those assigned problems for the posted tests.\n\nSimilarly, there are assigned project problems for the same tests. \n\nThe textbook: This CD-ROM contains files from the textbook. This CD-ROM contains files that develop problems and sample problems in the text. The Machid program is not exactly specific for problems to solve, but it is structured to provide solutions to the problems presented. \n\nOn each chapter the page references will relate the problems to the section in this manual. Although the projects require management-from professor, during the initial notes along side the other students as practice, Multi-problem problems train the management as if they were long-term assignments. \n\nAll of the authors who present these materials are students of this manual and have been assigned problems close to those presented. The authors of this manual created activity to review old problems, so it is still possible that there are some errors in this manual and none have the authority over the contents presented. \n\nAny questions can be reached to the following address:\n\nThomas A. Cook, Ph.D. PE\nProfessor of Mechanical & Aerospace Engineering, Emeritus\nMercer University\n665 Cyprus Point Drive, Grapevine, Texas 76408-5419\nvoice: (940) 779-2133, fax: (940) 779-2501, email: tomcook@gwt.net Chapter 1\nINTRODUCTION TO DESIGN\n\nTOPIC/PROBLEM MATRIX\n\nSECT TOPIC PROBLEMS\n1.4 Engineering Model 1-1, 1-2, 1-3\n1.9 Units 1-4, 1-5, 1-6, 1-7, 1-8\n\n© 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. MACHINE DESIGN - An\nPROBLEM 1-1\n\nStatement: It is often said, \"Build a better mousetrap and the world will beat a path to your door.\" Consider this problem and write a goal statement and a set of at least 12 task specifications that you would apply to its solution. Then suggest 3 possible concepts to achieve the goal. Make annotated, \nfeuchand sketches of the concepts.\n\nSolution:\nGoal Statement: Create a mouse-free environment.\n\nTask Specifications:\n1. Cost less than $1.00 per use or application.\n2. Allow disposal without human contact with mouse.\n3. Be safe for other animals such as house pets.\n4. Provide no threat to children or adults in normal use.\n5. Be a humane method for the mouse.\n6. Be environmentally friendly.\n7. Have a shelf-life of at least 3 months.\n8. Leave no residue.\n9. Create minimum audible noise in use.\n10. Create no detectable odors within 1 day of use.\n11. Be biodegradable.\n12. Be simple to use with minimal written instructions necessary.\n\nConcepts and sketches are left to the student. There are an infinity of possibilities.\n\nP0101.mod\n\n© 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. MACHINE DESIGN - An Integrated Approach\nPROBLEM 1-2\nStatement: A bowling machine is desired to allow quadriplegic youths, who can only move a joystick, to engage in the sport of bowling at a conventional bowling alley. Consider the factors involved, write a goal statement, and develop a set of at least 12 task specifications that constrain this problem. Then suggest 3 possible concepts to achieve the goal. Make annotated, freehand sketches of the concepts.\nSolution:\nGoal Statement: Create a means to allow a quadriplegic to bowl.\nTask Specifications:\n1. Cost no more than $2,000.\n2. Portable by no more than two able-bodied adults.\n3. Fit through a standard doorway.\n4. Provide no threat of injury to user in normal use.\n5. Operate from a 110 V, 60 Hz, 20 amp circuit.\n6. Be visually unthreatening.\n7. Be easily positioned at bowling alley.\n8. Have ball-aiming ability, controllable by user.\n9. Automatically reload returned balls.\n10. Require no more than 1 able-bodied adult for assistance in use.\n11. Ball release requires no more than a mouth stick-switch closure.\n12. Be simple to use with minimal written instructions necessary.\nConcepts and sketches are left to the student. There are an infinity of possibilities.\nPG104.mod\n© 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. MACHINE DESIGN - An Integrated Approach\nPROBLEM 1-3\nStatement: A quadriplegic needs an automated page turner to allow her to read books without assistance. Consider the factors involved, write a goal statement, and develop a set of at least 12 task specifications that constrain this problem. Then suggest 3 possible concepts to achieve the goal. Make annotated, freehand sketches of the concepts.\nSolution:\nGoal Statement: Create a means to allow a quadriplegic to read standard books with minimum assistance.\nTask Specifications:\n1. Cost no more than $1,000.\n2. Useable in bed or from a seated position.\n3. Accept standard books from 8.5 x 11 in to 4 x 6 in in platform and up to 1.5 in thick.\n4. Book may be placed, and moved by able-bodied person.\n5. Operate from a 110 V, 60 Hz, 1.5 amp circuit or by battery power.\n6. Be visually unthreatening and safe to use.\n7. Require no more than 1 able-bodied adult for assistance in use.\n8. Be able to be controlled by user.\n9. Not damage books.\n10. Taming controlled by user.\n11. Page turning requires no more than a mouth stick-switch closure.\n12. Be simple to use with minimal written instructions necessary.\nConcepts and sketches are left to the student. There are an infinity of possibilities.\nPG103.mod\n© 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. MACHINE DESIGN - An Integrated Approach\nPROBLEM 1-4\nStatement: Convert a mass of 1,000 lbm to (a) lbf, (b) slugs, (c) biobs, (d) kg.\nUnits:\nlbm = lbf/sec^2\nGiven: Mass:\nM = 1,000 lbf\nSolution:\nSee Mathcad file P0104.\n1. To determine the weight of the given mass, multiply the mass value by the acceleration due to gravity, g.\nW = mg\nW = 1000 lbf\n2. Convert mass units by assigning different units to the mass place-holder when displaying the mass value.\nSlugs:\nM = 31.081 slugs\nBiobs:\nM = 2.59 biobs\nKilograms:\nM = 453.592 kg\nPG104.mod\n© 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. MACHINE DESIGN - An integrated Approach\nPROBLEM 1.5\nStatement: A 250-lbm mass is accelerated at 40 in/sec². Find the force in lb needed for this acceleration.\nGiven: Mass M = 250 lb\nAcceleration a = 40 in/sec²\nSolution: See attached file P0105.\n1. To determine the force required, multiply the mass value, in slugs, by the acceleration in feet per second squared.\nConvert mass to slugs: M = 7.770 sl\t\nConvert acceleration to feet per second squared: a = 3.333 ft/sec²\nF = M a\nF = 25.9 lbf\n\n© 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher.