011209-Ch3

# 011209-Ch3 - 2 92-411 Machine Design Winter 2009 Department...

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1 92-411 Machine Design Winter 2009 Department of Mechanical, Automotive, and Materials Engineering 92-411: Machine Design I 2 Chapter 3: Load and Stress Analysis | Want to ensure safe operation and avoid part failure z Avoid excessive deflection and deformation z Use load and stress analysis Review FBDs Singularity functions Mohr’s circle Stresses associated with basic loading 92-411: Machine Design I 3 Chapter 3: Load and Stress Analysis | Design applications z stress concentrations z thin- and thick-walled pressurized cylinders z rotating rings z press and shrink fits z thermal stresses z curved beams z contact stresses 92-411: Machine Design I 4 Chapter 3: Load and Stress Analysis | Equilibrium and Free-Body Diagrams (FBD) z Recall that for stationary or constant velocity systems (i.e. zero acceleration): 0 0 = = M F v v

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2 92-411: Machine Design I 5 Chapter 3: Load and Stress Analysis | Purpose of the FBD z establish reference axes z simplifies & clarifies the system z communicates the system to others z assists in setting up mathematical relationships z illustrates methods used to solve the system 92-411: Machine Design I Figure 3-1 6 Chapter 3: Load and Stress Analysis | Example 3-1 Gear reducer with input shaft AB and output shaft CD Construct the FBD’s of each member 92-411: Machine Design I Figure 3-1 7 Chapter 3: Load and Stress Analysis | Gear box 92-411: Machine Design I Figure 3-1 8 Chapter 3: Load and Stress Analysis | Input and output shafts
3 92-411: Machine Design I Figure 3-2 9 Chapter 3: Load and Stress Analysis | Beams: shear force and bending moments 92-411: Machine Design I Figure 3-3 10 Chapter 3: Load and Stress Analysis | Sign conventions 92-411: Machine Design I Figure 3-4 11 Chapter 3: Load and Stress Analysis | Distributed load z load intensity, q(x) in force/unit length 92-411: Machine Design I 12 Chapter 3: Load and Stress Analysis A B x x M M A B x x V V M M Vdx dM V V qdx dV q dx M d dx dV dx dM V B A B A B A B A = = = = = = = 2 2 Equations 3-3 to 3-6:

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4 92-411: Machine Design I 13 Chapter 3: Load and Stress Analysis
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## This note was uploaded on 09/19/2009 for the course ME 416 taught by Professor Kauzmania during the Spring '09 term at Windsor.

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011209-Ch3 - 2 92-411 Machine Design Winter 2009 Department...

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