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เนื้อหาย่อ : The main objective of a basic mechanics course should be to develop in the engineering student the ability to analyze a given problem in a simple and logical manner and to apply to its solution a few fundamental and well-understood principles. This text is designed for the first course in me- chanics of materials-or strength of materials-offered to engineering stu- dents in the sophomore or junior year. The authors hope that it will help instructors achieve this goal in that particular course in the same way that their other texts may have helped them in statics and dynamics. In this text the study of the mechanics of materials is based on the understanding of a few basic concepts and on the use of simplified mod- els. This approach makes it possible to develop all the necessary for- mulas in a rational and logical manner, and to clearly indicate the con- ditions under which they can be safely applied to the analysis and design of actual engineering structures and machine components. Free-body diagrams are used extensively throughout the text to de- termine external or internal forces. The use of "picture equations" will also help the students understand the superposition of loadings and the resulting stresses and deformations. It is expected that students using this text will have completed a course in statics. However, Chap. 1 is designed to provide them with opportunity to review the concepts learned in that course, while shear and bending-moment diagrams are covered in detail in Secs. 5.2 and 5.3. The properties of moments and centroids of areas are described in ppendix A; this material can be used to reinforce the discussi determination of normal and shearing stresses in beams (Chaps. 4, 5, and 6). The first four chapters of the text are devoted to the analysis of the stresses and of the corresponding deformations in various structural rembers, considering successively axial loading, torsion, and pure bending. Each analysis is based on a few basic concepts, namely, the conditions of equilibrium of the forces exerted on the member, the re- lations existing between stress and strain in the material, and the con- ditions imposed by the supports and loading of the member. The study