Transcription of Chapter 2 Strain
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Mechanics of MaterialsChapter Introduction So far dealt mainly with thestrengthof structural member. Here we being our study of an equally important topic of mechanics deformations, orstrains. In general terms, strainis a geometric quantity that measures thedeformation of a body. There are two types of Strain normal Strain , which characterizes dimensional changes, and shear Strain , which describes distortion (changes in angles). stress and strainare twofundamental concepts of mechanics of materials. Their relationship to each other defines the mechanical properties of a material, the knowledge of which is of the utmost importance in design. Use force-deformation relationships in conjunction with equilibrium analysis to solve statically Axial Deformation stress - Strain Diagram The strength of a materialis not the only criterionthat must be considered when designing machineparts or structures. The stiffness of a materialis often equally important propertiessuch as hardness, toughness, and properties are determined by laboratory tests.
Stress and strain are two fundamental concepts of mechanics of materials. Their relationship to each other defines the mechanical properties of a material, the knowledge of which is of the utmost importance in design. Use force-deformation relationships in conjunction with
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