Lecture 25 sect 7.1

# Lecture 25 sect 7.1 - ME 221 Statics Lecture#25 Sections...

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ME221 Lecture 25 1 ME 221 Statics Lecture #25 Sections 7.1 – 7.4

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ME221 Lecture 25 2 Homework #9 Chapter 5 problems: 53, 54, 56, 62, 64, 69, 71 & 73 Due Friday, October 31
ME221 Lecture 25 3 Homework #10 Chapter 7 problems: 2, 5, 6, 8, 19, 21, 24, 26 & 35 Due Friday, November 7

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ME221 Lecture 25 4 Chapter 7: Internal Forces in Structures Review internal/external forces How to find internal forces Sample problems
ME221 Lecture 25 5 External/Internal Forces External forces arise from contact or gravitational attraction Point and distributed loading Weight Internal forces are forces arising to hold bodies together Internal stress is a form of an internal force

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ME221 Lecture 25 6 Exposing Internal Forces To analyze the stress at a given location in a part, we need to know the forces at that particular section. 100 lb a a b b c c At any given section a-a, b-b, or c-c, there is an internal force arising from the 100 lb external force.
ME221 Lecture 25 7 Method for Finding Internal Forces

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Lecture 25 sect 7.1 - ME 221 Statics Lecture#25 Sections...

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