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page 1
Mechanisms and Multibody Systems MECH3422
Second Semester
1st Deadline: Monday 10 September 2012, 9.30 am
2nd Deadline: Friday 12th October 2012, 1.30 pm
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CHAPTER 5:
DIFFUSION IN SOLIDS
Topics to Cover.
How does diffusion occur?
Why is it an important part of processing?
How can the rate of diffusion be predicted for
some simple cases?
How does diffusion depend on structure
and temperature?
PROCESSING U
CHAP. 6: MECHANICAL PROPERTIES of
METALS
Topics to Discuss.
Stress and strain
Elastic behavior: When loads are small, how much
deformation occurs? What materials deform least?
Plastic behavior: At what point do dislocations
cause permanent deformation?
Chapter 11: Metal Alloys
Applications and Processing
ISSUES TO ADDRESS.
How are metal alloys classified and how are they used?
What are some of the common fabrication techniques?
How do properties vary throughout a piece of material
that has been quenc
CHAPTER 9: PHASE DIAGRAMS
ISSUES TO ADDRESS.
When we combine two elements.
what equilibrium state do we get?
In particular, if we specify.
-a composition (e.g., wt%Cu - wt%Ni), and
-a temperature (T)
then.
How many phases do we get?
What is the composit
Chapter 10:Phase Transformations
(primarily look at Fe-C system)
ISSUES TO ADDRESS.
Transforming one phase into another takes time (kinetics)
Fe
(Austenite)
C
FCC
Fe C
3
Eutectoid
transformation (cementite)
+
(ferrite)
(BCC)
How does the rate of transfo
Lecture 24
Probability Problems; Central
Moments
Probability Application Problems
HP5.5: Using the graph of the probability density function
of an underlying population presented in Figure 1, determine (a) the percent probability that one randomly select
Four bar linkage coupler curve
Chris Peterson and Hirotachi Abo
Let k = R. Consider the following problem:
Problem. Compute the equation of the four bar linkage curve obtained by
taking the points A = (0, 0), B = (0, 2), C = (x1 , y1 ) and D = (x2 , y2 )
11/7/2013
CHAPTER 13: APPLICATIONS AND
PROCESSING OF CERAMICS
ISSUES TO ADDRESS.
How do we classify ceramics?
What are some applications of ceramics?
How is processing different than for metals?
TAXONOMY OF CERAMICS
Glasses
Clay Refractories Abrasives
CHAPTER 12: STRUCTURE AND
PROPERTIES OF CERAMICS
ISSUES TO ADDRESS.
Structures of ceramic materials:
How do they differ from that of metals?
Point defects:
How are they different from those in metals?
Impurities:
How are they accommodated in the lattic
9/18/2013
CHAPTER 7:
DISLOCATIONS AND STRENGTHENING
ISSUES TO ADDRESS.
How are strength and dislocation motion related?
How do we increase strength?
How can heating change strength and other properties?
Dislocations & Materials Classes
Metals: motion eas
Chapter 14: Polymer Structures
The Chemistry and Composition of Polymers
Molecular Weight, Shape, Structure and Configuration
Thermoplastic and Thermosetting Polymers
Polymer Crystallinity
Polymer - A polymer is a macromolecule built of small units
called
Chapter 8
Failure
Why do things still sometimes break even when stressed below
their apparent yield strength?
Fracture
Ductile versus Brittle Fracture
Fracture Mechanics
flaws, defects or cracks
Stress concentration at sharp notches
Impact Fracture Testin
CHAPTER 16:
COMPOSITE MATERIALS
ISSUES TO ADDRESS.
What are the classes and types of composites?
Why are composites used instead of metals,
ceramics, or polymers?
How do we estimate composite stiffness & strength?
What are some typical applications?
C
Chapter 15:
Characteristics, Applications &
Processing of Polymers
ISSUES TO ADDRESS.
What are the tensile properties of polymers and how
are they affected by basic microstructural features?
Hardening, anisotropy, and annealing in polymers.
How does th
11/27/2013
CHAPTER 17:
CORROSION AND DEGRADATION
ISSUES TO ADDRESS.
Why does corrosion occur?
What metals are most likely to corrode?
How do temperature and environment affect
corrosion rate?
How do we suppress corrosion?
Corrosion usually thought of
12/5/2013
CHAPTER 18:
ELECTRICAL PROPERTIES
ISSUES TO ADDRESS.
How are electrical conductance and resistance
characterized?
What are the physical phenomena that distinguish
conductors, semiconductors, and insulators?
For metals, how is conductivity aff
Lecture 26
Students t Distribution
(Section 6.4)
Applied Review of x and xi Relations:
The t Distribution:
The t distribution was derived by William Gossett, Guiness brewer and statistician. He published it under the
pseudonym Student in 1908 in the jour
Lecture 15
The End of Uncertainty
Class Game Plan: We will cover the remainder of uncertainties associated with curve tting (there are a series of
PowerPoint slides for this topic at the end of this handout).
Then, we will start dynamic system response.
C
Lecture 13
Continuing with Uncertainty
Class Game Plan: First, we will have an in-class quiz on
the uncertainty topics that we have already covered. Then, we
will work the remaining two problems from last lecture. Finally,
we will discuss curve tting and
Lecture 25
The Normal Distribution
(Sections 6.1 through 6.3)
Figure 1: The nite sample and the innite population.
Population parameters include the true mean, x , the true
variance, 2, and the true standard deviation, .
Sample statistics include the sa
Lecture 22
More Signal Processing
Aliasing and the Folding Diagram
Consider the signal y(t) = sin(20t) that is sampled at 12
samples/s. Here, f = 10 Hz.
Will amplitude ambiguity be present if N = 128?
What if N = 120?
Because fs is not greater than tw
Lecture 19
Signal Characteristics
See pages 343-354
Characterizing Signals
A signal is the temporal variation of a physical variables
magnitude, Ain, as represented by the output of a measurement system, Aout.
Assume for now (unrealistically) that the m
Lecture 17
Second-Order Systems
Second-Order System Response (pp.118-125)
For step-by-step derivatives of all second-order system equations, see: http:/www.nd.edu/ pdunn/www.text/derivations.pdf
The general expression for a second-order ODE is
a2y + a1y
Lecture 21
Digital Sampling
(Sections 10.1, 10.2, 10,3, 10.6)
Determining Sampling Conditions
Before setting your signal sampling conditions, you should
consider several issues.
Can the signal be classied? Is it deterministic or random?
Examine the sig
Quiz #1
1. As the extent of deformation increases, the recrystallization temperature will
(a) increase (b) decrease (c) not change
2. The yield stress of a metal will _ with an increase in grain size.
(a) increase (b) decrease (c) not change
3. Cold worki
Lecture 1
Course Introduction
Planning an Experiment
review course material by browsing class web site:
http:/www.nd.edu/ pdunn/www.ame250/ame250.html
denition of an experiment (p4)
four classications of experiments according to their purpose
(p8)
den