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MSE 160 - MODULE 7 L18 - Failure Mechanisms.pdf
MSE_160_-_MODULE_7_L18_-_Failure_Mechanisms.pdf
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MSE 160 - MODULE 7 L18 - Failure Me...
MSE_160_-_MODULE_7_L18_-_Failure_Mechanisms.pdf-MSE 160S MSE 160S Ml l
Page 1
MSE 160S
MSE
160S
Ml
l
dM t
il
M
o
l
ecu
l
es an
d
M
a
t
er
i
a
l
s
Harry Ruda
Part 2: Introduction to Materials
1
Page 2
Week
1
Topic
Course Outline and General Introduction
Crystalline Structures
Chapter
3
Lecture
L1
L2
2
3
Crystalline
Structures
Crystalline Structures
Crystalline Structures
Imperfections and Diffusion
3
3
3
4
L2
L3
L4
L5
3
4
Imperfections
and
Diffusion
Imperfections and Diffusion
Imperfections and Diffusion
Phase Dia
g
rams
4
4
4
9
L5
L6
L7
L8
5
Phase Diagrams
Phase Diagrams
Phase Diagrams
9
9
9
L9
L10
L11
6
Mechanical Properties
Mechanical Properties
Mechanical Properties
Di l
ti
d
St
th
i
6
6
6
7
L12
L13
L14
L15
7
Di
s
l
oca
ti
ons an
d
St
reng
th
en
i
ng
Dislocations and
Strengthening
Dislocations and
Strengthening
Failure Mechanisms
7
7
7
8
L15
L16
L17
L18
2
Failure
Mechanisms
8
L18
Page 3
Crystalline Structures
Lecture Schedule – MC102
Mondays (3 - 4 pm)
Wednesdays (1 -2 pm)
Fridays (4 -5 pm)
Week 1 (February 27)
L1
L2
*
Week 2 (March 5)
*
L3
L4
Week 3 (March 12)
L5
L6
L7
Week 4 (March 19)
L8
L9
L10
Week 5
(
March 26
)
L11
L12
L13
Week 6 (April 2)
L14
L15
**
Week 7
(
A
p
ril 9
)
L16
L17
L18
* Prof. Ruda away giving invited lecture
** Good Friday
3
Page 4
Lectures L18 – Failure Mechanisms
You will learn about:
•
How Cracks that Lead to Failure Form
•
How Fracture Resistance is Quantified and How
DifferentTypes of Material Compare
•
How
to Estimate
the
Stress
to
Fracture
How
to
Estimate
the
Stress
to
Fracture
•
How Loading and Temperature Affect Failure Behaviour
Computer Chip Thermal Loading
Hip
Implant Loading
from
Walking
4
Computer
Chip
Thermal
Loading
Hip
Implant
Loading
from
Walking
Page 5
Failure Mechanisms
•
Ductile Fracture
–
A
ccom
p
anied b
y
Si
g
nificant Plastic Deformation
•
Brittle Fracture
–
Little or
No Plastic Deformation
– Catastrophic
5
Page 6
Failure Mechanisms
Ductile versus Brittle Failure
Very
Ductile
Moderately
Ductile
Brittle
Fracture
Behaviour
:
Ductile
versus
Brittle
Failure
Ductile
Ductile
Behaviour
:
Lar
g
e
Moderate
%
A
R
or %
EL
Small
Ductile Fracture
Usually Preferred
over Brittle Fracture!
Ductile:
Warning Before
Fracture
Brittle:
No
Warning
6
Fracture
Warning
Page 7
Failure Mechanisms
Examples:
•
Ductile
Failure:
One Piece
Examples:
-
One
Piece
- Large Deformation
•
Brittle
Failure:
- Many Pieces
- Small Deformations
7
Page 8
Failure Mechanisms
Moderatel
y
Ductile Failure
•
Failure Stages
:
Necking
Void
Nucleation
Void Growth
and Coalescence
Shearing
at Surface
Fracture
• Resulting
50 mm
50 mm
•
Resulting
Fracture
Surfaces
50
mm
50
mm
(Steel)
Particles
Serve
as
Void Nucleation Sites
100 mm
8
Serve
as
Void
Nucleation
Sites
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