L13 - MAE 486 Design of Mechanical Systems Lecture 13 Fall...

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Unformatted text preview: MAE 486 Design of Mechanical Systems Lecture 13 Fall 2011 Today s topics: Decision Making (Chapter 7); Material Selection (Chapter 11); 1 Find the critical path in the given plot right. 2 The left brain is good for The right brain is good for A good designer needs to be good at [A] Creative thinking [B] Lateral thinking [C] Day dreaming [D] Intuitive thinking [E] Both A and C [F] Vertical thinking [G] Both B and F [H] Both C and D [I] None of the above 3 Give (a) one design example that agrees with the decoupling corollary and one example that agrees with the integration corollary in the Axomatic Design approach. Review: •  •  •  •  •  Pugh Concept Selec6on Method Mo6va6on: How to compare apple to peach? What is the idea? What are the steps? Measurement Scales Weighted Decision Matrix Review: AHP: Analy6cal Hierarchy Process •  Mo6va6on ques6on: How do we know –  One criterion is more important than the other? By how much? –  One design choice is beHer than the other? By how much? •  What is it? •  Mathema6cal founda6on: •  What is the goal: Use of AHP to Weight Design Criteria •  How to determine ra6ng factors? •  What are the steps? Use of AHP to Weight Design Criteria •  What are the steps? Use of AHP to Weight Design Criteria: Consistency Check •  What are the steps? Use of AHP: Are we done? •  What is next when using AHP in design? •  How to apply AHP to design selec6ons? Use of AHP: Are we done? •  How to apply AHP to design selec6ons? Use of AHP: Are we done? •  How to apply AHP to design selec6ons? AHP in Design: Consistency Check Use of AHP in Design: Select the Best Material Selec6on (Chapter 11) •  Why is it important in design? •  Rela6on to Design Material Selec6on at Different Stages of Design What are the Criteria in General? Material Selec6on Process: Overview Performance Characteris6cs •  What are the material proper6es we need to look at? •  Key concept: •  How to alter ___________? Concept of Structure •  In engineering design •  In material science & engineering How to classify materials? •  What are the basic types? •  What are structural materials? •  What are the characteris6cs of engineering materials? Classifica6on of Materials How to select proper6es to measure? •  What are the criteria? Proper6es Mechanical Proper6es Mechanical Proper6es •  Ul#mate tensile strength: •  Modulus of elas#city (Young modulus): •  Duc#lity:   Fracture toughness: •  Fa#gue proper#es: Mechanical Proper6es •  Damping capacity •  Creep: •  Impact resistance: •  Hardness: •  Wear rate: Mechanical Proper6es of Typical Materials •  Metal : –  –  –  –  –  Modulus Duc#lity Strengthened by Fa6gue, Resistant to corrosion •  Ceramics: –  –  –  –  –  Modulus Duc#lity Tolerance to stress concentra#on Strength in compression vs. strength in tension Resistant to corrosion Mechanical Proper6es of Typical Materials •  Glass: –  Crystal? –  Duc#lity –  Tolerance to stress concentra#on •  Polymer: –  –  –  –  –  Modulus Strength Temperature? Resistance to corrosion Duc#lity Ashby Charts ...
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This note was uploaded on 02/26/2012 for the course 650 486 taught by Professor Zou during the Fall '11 term at Rutgers.

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