ME215-3CPM - ME -215 ENGINEERING MATERIALS AND PROCESES...

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Veljko Samardzic ME-215 Engineering Materials and Processes ME -215 ENGINEERING MATERIALS AND PROCESES Prerequisite: Chemistry 126 Instructor: Veljko Samardzic Office: MEC119, Tel.: 973-596-3247 E-mail: vxs9076@njit.edu Lectures: Tuesday,6:00 pm-7:30 pm, MEC221 Labs: Tuesday,7:30 pm-9:00 pm, MEC232 Office Hours: Tuesday,11:30 am-12:30 pm, 5:00 pm- 6:00 pm; Thursday, 2:00 pm-3:00 pm
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Veljko Samardzic ME-215 Engineering Materials and Processes Link to Notes on the Web http://www-ec.njit.edu/~me/courses_index.htm click on ME 215
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Veljko Samardzic ME-215 Engineering Materials and Processes PROPERTIES OF MATERIALS Chapter 2
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Veljko Samardzic ME-215 Engineering Materials and Processes Materials Properties PROPERTIES PERFORMANCE STRUCTURE PROCESSING
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Veljko Samardzic ME-215 Engineering Materials and Processes 2.1 Metals and Nonmetals Engineering materials divided into: metallic and nonmetallic ; Metallic (pure): iron, copper, aluminum, magnesium, nickel, titanium, lead, tin, etc. Alloys : steel, bronze, brass, etc. High strength, good E/T conductivity, luster, high deformability without fracture, high density; Nonmetallic : concrete, brick, wood, glass, rubber, plastics, composites, etc.
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Veljko Samardzic ME-215 Engineering Materials and Processes 2.1 Properties of Materials Physical properties are very important in material selection: density (weight), melting point, optical properties (color, transparency, opaqueness, thermal properties (specific heat, coefficient of thermal expansion, thermal conductivity, electrical conductivity and magnetic properties); Mechanical properties describe response of material to applied forces or loads. Determined by standard laboratory tests. Static and dynamic properties.
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Veljko Samardzic ME-215 Engineering Materials and Processes 2.1 Stress By definition it is force divided by cross-sectional area transmitting the load: ,N/m², MPa, lb/ in² Types of stress: normal (tension or compression), shear, hydrostatic pressure; Engineering stress; True stress. A F S =
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Veljko Samardzic ME-215 Engineering Materials and Processes Engineering vs. True Strain Engineering strain defined as elongation divided by initial gage length: True strain : L L Li Li Lf e = - = D Do Lo L l dl L Lo ln 2 ln = = = ε
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Veljko Samardzic ME-215 Engineering Materials and Processes 2.2 Static Properties If loads applied on the material do not vary
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ME215-3CPM - ME -215 ENGINEERING MATERIALS AND PROCESES...

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