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CMGT 322 LECTURE 2
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FORCES DEFINE FORCE DEFINE UNITS FOR FORCES THREE IMPORTANT FACOR ABOUT FORCES: MAGNITUDE, DIRECTION, SENSE STRESS= FORCE/AREA UNITS FOR STRESS
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LECTURE TWO TYPES OF STRESS COMPRESSIVE TENSILE SHEAR STREE STRESS IS RELATED TO FORCE DIVIDED BY THE AREA
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LECTURE TWO COMPRESSIVE STRESS ISSUES TENSILE STRESS ISSUES SHEAR STRESS ISSUES STRAIN=e/L STRESS IS DIRECTLY PROPORSIONAL TO STRAIN
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LECTURE TWO MODULUS OF ELASTICITY=STRESS/STRAIN Es= 30,000,000 psi Ew= 1.0-2.5 million psi Ec= 2-5 million psi It is important to know how stiff the material is, modulus of elasiticity
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Lecture two Five variables we need to deal with when it comes to stress strain and modulus of elasticity: –LENGTH –FORCE/LOAD –AREA –ELONGATION –MODULUS OF ELASTICITY
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LECTURE TWO CROSS SECTION ARE IS VEY IMPORTANT, WE NEED TO KNOW HOW TO CALCULATE IT WATCH UNITS SEE EXAMPLES
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