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ME 221Lecture 211 ME 221 Statics Lecture #21 Sections 9.7 - 9.9
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ME 221Lecture 212 Homework #7 Chapter 4 problems: –52, 53 & 54 Chapter 9 problems: –2, 3, 4, 11, 23, 29 & 32 –Use double integration for 2, 3, 4 & 11 Due today
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ME 221Lecture 213 Homework #8 Chapter 9 problems: –42, 43, 50 & 55 Chapter 5 problems: –11, 13, 16, 20, 24 & 25 –See Blackboard for additional information Due Wednesday, October 30
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Exam #2 Results Average score = 81 Scores posted on Blackboard Solution posted on Blackboard See syllabus for regrade policy
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Last Lecture Principal Second Moments Product Moment of Inertia Principal Axes Mohr’s Circle
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Mechanics Nomenclature Polar Moment of Inertia = Torsional Stiffness Second Moment of Area = Bending Stiffness
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ME 221Lecture 217 Product Moment of Inertia Basic section with two axes of symmetry x y Composite sections - product parallel axis theorem
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ME 221Lecture 218 Mohr’s Circle for Principal Inertia +I xy -I xy I xx, I yy I yy x I xx I xy x draw point (I xx, I xy ) and the circle (I xx +I yy )/2 draw circle center (I xx + I yy )/2 x I MAX I MIN 22 use geometry to find I MAX, I MIN and Angles in Mohr’s circle are twice those in the section analyzed.
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ME 221Lecture 219 Chapter 9 Examples
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Guest Speaker Engineering Study Abroad Program Dr. Darren Mason Albion College (formerly at MSU) Engineering in Russia Summer 2003
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