Mechanical Properties of Metals - Lecture Notes | ENGR 115, Study notes of Engineering

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ENGR 115 Strength of Materials (SOM) Handout

ENGR 115 Strength of Materials (SOM) Handout 114 © Chapter 6 / Mechanical Properties of Metals between the microstructure (Le., internal features) of materials and their mechani- cal properties, Materials are frequently chosen for structural applications because they have desirable combinations of mechanical characteristics. The present discussion is can- fined primarily to the mechanical behavior of metals; polymers and ceramics are treated separately because they are. to a large degree, mechanically disshmilar to metals, This chapter discusses the stress-strain behavior of metals and the related mechanical properties, and also examines other important mechanical characteris: tics. Discussions of the microscope aspects af deformation mechanisens and methods to strengthen and regulate the mechanical behavior of metals are deferred to later chapters, 6.2 Concerts oF Sirmess ap Stmary Tf a load is static of changes relatively slowly with time and is applied uniformly over a cross section or surface of a member, the mechanical behavior may be ascertained by a simple stress~strain test; these are most. commonly conducted for metals at room tempernture. There are three principal ways in which a load may be applied: namely, tension, compression and shtar (Figures 6.10. 5,c). In engineering Frame 6.0 (a) Schematic thustration of how a tensile load Produces an elongation andl pesnitive Unrest aroun Dashed lines represent the shape ‘belote deformation, solid lines, after deformation. (4) Geformation (Le, angle caf cuist &) produced by ‘an applied torque T.