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