Lec15w.StressGradients - Assumptions : 1. Tip deflection is...

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EE 245: Introduction to MEMS Lecture 15: StressGradients CTN 10/19/09 Copyright © 2009 Regents of the University of California Announcements : Lecture schedule for the next 4 weeks: Midterm Exam: ª Tu, Nov. 3, during regular lecture ª 1.5 hours, but might go longer Monday Tuesday Wednesday Thursday Friday Oct. 5 Lecture 5-6:30 241 Cory 6 Lecture 3:30-5 Moffitt 7 8 Discuss 3:30-5 Moffitt 9 12 Lecture 5-6:30 241 Cory 13 14 15 Discuss 3:30-5 Moffitt 16 19 Lecture 5-6:30 241 Cory 20 Lecture 3:30-5 Moffitt 21 22 Lecture 3:30-5 Moffitt 23 26 Discuss 3:30-5 Moffitt 27 28 29 Lecture 3:30-5 Moffitt 30 Nov. 2 Lecture 5-6:30 241 Cory 3 Midterm 3:30-5 Moffitt 4 5 Lecture 3:30-5 Moffitt 6 Today : Reading: Senturia, Chpt. 9 Lecture Topics: ª Bending of beams ª Cantilever beam under small deflections ª Combining cantilevers in series and parallel ª Folded suspensions ª Design implications of residual stress and stress gradients ---------------------------------- Problem : Bending a Cantilever Beam Objective : Find relation between tip deflection y(x=L c ) and applied load F
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Unformatted text preview: Assumptions : 1. Tip deflection is small compared with beam length 2. Plane sections (normal to beams axis) remain plane and normal during bending, i.e., pure bending 3. Shear stresses are negligible F x L c x Clamped end condition : At x=0 : y=0 dy/dx = 0 Free end condition EE 245: Introduction to MEMS Lecture 15: StressGradients CTN 10/19/09 Copyright 2009 Regents of the University of California EE 245: Introduction to MEMS Lecture 15: StressGradients CTN 10/19/09 Copyright 2009 Regents of the University of California F x L c x Clamped end condition : At x=0 : y=0 dy/dx = 0 Free end condition EE 245: Introduction to MEMS Lecture 15: StressGradients CTN 10/19/09 Copyright 2009 Regents of the University of California EE 245: Introduction to MEMS Lecture 15: StressGradients CTN 10/19/09 Copyright 2009 Regents of the University of California...
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Lec15w.StressGradients - Assumptions : 1. Tip deflection is...

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