Fundamentals of Machine Component Design

Abstract

A number of books on machine design have appeared on the market, some fair, some good, few excellent.This large volume definitely belongs in the latter category, containing a homogeneous combination of theory, experimental findings and above all, a large number of illustrative examples.As stated by the author, "This book is intended as a text for first courses in mechanical engineering design and as a reference for practicing engineers."Juvinall fulfills his intention.Chapter 1 introduces mechanical engineering design in a broad perspective.Safety, ecological and social considerations are discussed as well as systems of units in work, energy, and power.The ensuing chapters take up such basic concerns as load analysis from the the points of view of equilibrium equations, free body diagrams, beam loadings and force flow concepts; materials and their respective tests, energy absorption by machines, static body forces, explanations of axial, direct, torsional, bending and transverse shear on straight and curved beams, Mohr's circle, and concentration factors.Chapter 5 progresses naturally into a discussion of elastic strain, deflection, stability, strain gage equations, and Castigliano's theory.A consideration of elastic stability rounds out the chapter.Various failure theories, safety and reliability factors, the Gauss normal distribution curve, dynamic loading, and the simple relationships of stress and deflection due to linear, bending, and torsional impact are considered in chapters 6 and 7.However, the discussion is hindered here, by Juvinall's failure to present a review of vibration theory with this material.Chapters 8 and 9 turn to the fatigue concept with a good explanation of the standard fatigue tests.The contents include fatigue life, production of randomly varying loads (Miner's rule), the influence of surface conditions on the fatigue strength of materials, the effects of stress combinations due to combined alternating and mean loads, the effects of corrosion, cavitation damage, and adhesive and abrasive fretting wear.Chapter 8 is particularly fine; chapter 9 introduces the preliminary aspects of mechanical design applied to machines.The next chapter treats threaded fasteners and power screws.This includes bolt tightening and initial tension, thread loosening, bolt and screw selection, and both static and fatigue loading; unfortunately, the presentation is weakened by Juvinall's failure to discuss the stresses due to thermal, preload, and bending loading.