01_Introduction to mechanical metallurgy

01_Introduction to mechanical metallurgy - Suranaree...

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Unformatted text preview: Suranaree University of Technology May-Aug 2007 Introduction to mechanical Introduction to mechanical metallurgy metallurgy Subjects of interest • Introduction to mechanical metallurgy • Strength of materials – Basic assumptions • Elastic and plastic behaviour • Average stress and strain • Tensile deformation of ductile metals • Ductile vs brittle behaviour • What constitute failure? • Concept of stress and the types of stresses • Units of stress and other quantities Chapter 1 Tapany Udomphol Suranaree University of Technology May-Aug 2007 Objectives Objectives • This chapter provides a background of continuum description of stress and strain and extends it to the defect mechanisms of flow and fracture of metals. • Elastic and plastic behaviours of metals are highlighted and factors influencing failure in metals are finally addressed. Tapany Udomphol Suranaree University of Technology May-Aug 2007 Introduction Introduction Mechanical metallurgy : Response of metals to forces or loads. Mechanical assessment of Materials • Structural materials • Machine, aircraft, ship, car etc We need to know limiting values of which materials in service can withstand without failure. Forming of metals into useful shapes • Forging, rolling, extrusion. • drawing, machining, etc We need to know conditions of load and temperature to minimise the forces that are needed to deform metal without failure. Tapany Udomphol Suranaree University of Technology May-Aug 2007 Strength of materials Strength of materials Strength of materials deals with relationships between; • internal resisting forces • deformation • external loads , which act on some part of a body (member) in equilibrium. • The internal resisting forces are usually expressed by the stress acting over a certain area , so that the internal force is the integral of the stress times the differential area over which it acts. ∫ = dA P σ • In equilibrium condition, if there are the external forces acting on the member, there will be the internal forces resisting the action of the external loads. ∫ dA σ P Internal force External force …Eq.1 Tapany Udomphol Suranaree University of Technology May-Aug 2007 Assumptions in strength of materials Assumptions in strength of materials The body (member) is • Continuous: No voids or empty spaces. • Homogeneous: Has identical properties at all points. • Isotropic: Has similar properties in all directions or orientation. Remark: Anisotropic is when the body has property that varies with orientation. Microscopic scale , metals are made up of an aggregate of crystal grains having different properties in different crystallographic directions....
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This note was uploaded on 11/09/2010 for the course AEROSPACE AE 1202 taught by Professor Dr.adib during the Spring '10 term at Sharif University of Technology.

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01_Introduction to mechanical metallurgy - Suranaree...

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