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.
Figure 2.4 Stress-strain diagrams for various materials that fail without significant yielding. ( )2003 k /C l bli hi / h i However, the phenomenon of yielding is unique to structural steel. Other grades of steel, steel alloys, and other material do not yield, as indicated by the stress-strain curves of the materials shown in Fig.2.4..
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