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Met 223 ss week 4

Met 223 ss week 4

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mechanics of material

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LECTURE #7 MET 223 Principles of Materials Engineering Instructor : Asst. Prof. Dr. Derya Kapusuz Dept. of Metallurgical and Materials Eng. Office : ME/MET Main Building, 1/4 E-mail : dkapusuz@gantep.edu.tr Phone : +90 (342) 360 1200-3906 1 Stress distribution around dislocations Lattice Distortion Sites (Strain Fields radiate from dislocation line) The upper half of the crystal is under compression Experiencing a compressive strain wrt atoms positioned in the perfect crystal The bottom half of the crystal is under tension. Experiencing a tensile strain wrt atoms positioned in the perfect crystal Shear strains in the vicinity of the edge dislocation*. *Screw dislocation: lattice strains are pure shear only. 2 Dislocation interaction 3 Dislocation interaction During plastic deformation, the number of dislocations increases. Source of these new dislocations (dislocation formation sites during deformation): existing dislocations (they multiply), grain boundaries, internal defects and surface irregularities (scratches and nicks, which act as stress concentrations). 4 Mechanical Properties Mechanical behavior of a material reflects its response or deformation in relation to an applied load or force. Many engineering products are subjected to force in service (i.e. Bridges, airplane wings, etc.) - To assess the mechanical properties of a material, we have to mimic the service conditions of the material as close as possible. (T, load, environmental conditions, state ...
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