• Book Name: Mechanical Behavior of Materials 4th Edition
  • Author: Norman E. Dowling
  • Pages: 975
  • Size: 12 MB
mechanical behavior of materials dowling 4th edition pdf

Mechanical Behavior of Materials Dowling 4th Edition Pdf

Designing machines, vehicles, and structures that are safe, reliable, and economical requires both efficient use of materials and assurance that structural failure will not occur. It is therefore appropriate for undergraduate engineering majors to study the mechanical behavior of materials, specifically such topics as deformation, fracture, and fatigue.

This book may be used as a text for courses on mechanical behavior of materials at the junior or senior undergraduate level, and it may also be employed at the first-year graduate level by emphasizing the later chapters. The coverage includes traditional topics in the area, such as materials testing, yielding and plasticity, stress-based fatigue analysis, and creep. The relatively new methods of fracture mechanics and strain-based fatigue analysis are also considered and are, in fact, treated in some detail. For a practicing engineer with a bachelor’s degree, this book provides an understandable reference source on the topics covered.

Emphasis is placed on analytical and predictive methods that are useful to the engineering designer in avoiding structural failure. These methods are developed from an engineering mechanics viewpoint, and the resistance of materials to failure is quantified by properties such as yield strength, fracture toughness, and stress–life curves for fatigue or creep. The intelligent use of materials property data requires some understanding of how the data are obtained, so their limitations and significance are clear. Thus, the materials tests used in various areas are generally discussed prior to considering the analytical and predictive methods.

Mechanical Behavior of Materials Dowling 4th Edition Pdf

In many of the areas covered, the existing technology is more highly developed for metals than for nonmetals. Nevertheless, data and examples for nonmetals, such as polymers and ceramics, are included where appropriate. Highly anisotropic materials, such as continuous fiber composites, are also considered, but only to a limited extent. Detailed treatment of these complex materials is not attempted here.

The remainder of the Preface first highlights the changes made for this new edition. Then comments follow that are intended to aid users of this book, including students, instructors, and practicing engineers.

WHAT IS NEW IN THIS EDITION?

Relative to the third edition, this fourth edition features improvements and updates throughout. Areas that received particular attention in the revisions include the following

• The end-of-chapter problems and questions are extensively revised, with 35% being new or significantly changed, and with the overall number increased by 54 to be 659. In each chapter, at least 33% of the problems and questions are new or changed, and these revisions emphasize the more basic topics where instructors are most likely to concentrate.

• New to this edition, answers are given near the end of the book for approximately half of the Problems and Questions where a numerical value or the development of a new equation is requested.

• The end-of-chapter reference lists are reworked and updated to include recent publications, including databases of materials properties.

• Treatment of the methodology for estimating S-N curves in Chapter 10 is revised, and also updated to reflect changes in widely used mechanical design textbooks.

• In Chapter 12, the example problem on fitting stress–strain curves is improved.

• Also in Chapter 12, the discussion of multiaxial stress is refined, and a new example is added.

• The topic of mean stress effects for strain-life curves in Chapter 14 is given revised and updated coverage.

• The section on creep rupture under multiaxial stress is moved to an earlier point in Chapter 15, where it can be covered along with time-temperature parameters.

PREREQUISITES

Elementary mechanics of materials, also called strength of materials or mechanics of deformable bodies, provides an introduction to the subject of analyzing stresses and strains in engineering components, such as beams and shafts, for linear-elastic behavior. Completion of a standard (typically sophomore) course of this type is an essential prerequisite to the treatment provided here. Some useful review and reference material in this area is given in Appendix A, along with a treatment of fully plastic yielding analysis.

Many engineering curricula include an introductory (again, typically sophomore) course in materials science, including such subjects as crystalline and noncrystalline structure, dislocations and other imperfections, deformation mechanisms, processing of materials, and naming systems for materials. Prior exposure to this area of study is also recommended. However, as such a prerequisite may be missing, limited introductory coverage is given in Chapters 2 and 3.

Mathematics through elementary calculus is also needed. A number of the worked examples and student problems involve basic numerical analysis, such as least-squares curve fitting, iterative solution of equations, and numerical integration. Hence, some background in these areas is useful, as is an ability to perform plotting and numerical analysis on a personal computer. The numerical analysis needed is described in most introductory textbooks on the subject, such as Chapra (2010), which is listed at the end of this Preface.

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