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เนื้อหาย่อ : This second edition of Theory and Problems of Strength of Materials adheres to the basic plan of the first edition, but with a considerable broadening of scope. As in the earlier edition, the contents are divided into chapters covering duly-recognized areas of theory and study. Each chapter begins with a summary of the pertinent defnitions, principles, and theorems, followed by graded sets of solved and supple- mentary problems. Derivations of formulas and proofs of theorems are included among the solved problems. The problems have been chosen and solutions arranged so that the principles are clearly established. They serve to illustrate and amplify the theory, provide the repetition of basic principles so vital to effective teaching, and bring into sharp focus those fine points which are essential to a complete under- standing. Since publication of the frst edition, course offerings in strength of materials have become more sophisticated and frequently tend to include topics in plastic analy- sis and design, treatments of shear centers, curved beams, and use of singularity functions to describe beam behavior. Also, it has become rather common to introa'ce the student to strain energy methods of analysis and the elements of the theory of elasticity. The present edition includes solved problems in all these areas, as well as in others not previously represented. The author is deeply indebted to his wife, Verna B. Nash, and his children Rebecca and Phillip, for their patience and understanding during the preparation of the manu- script.