MA2001 MECHANICS OF MATERIALS (MOM)
Dr Chou Siaw Meng
Associate Professor
Tel: 67904958 | Office: N3.2-02-71
Email: [email protected]
School of Mechanical and Aerospace Engineering
Nanyang Technological University
Textbook: MECHANICS OF MATERIALS (5th ed
Answers for past yr exam papers
MA2001/MP2001/AE2008
2010/11 Sem 1
1a) FAB=30 kN, FBC=33.54 kN
b) 10.33 mm
c) =149.29 MPa, = 125.27 MPa
d) Not in syllabus
2a) circum =43.75 MPa, long =21.88 MPa
b) 43.75E-6
c) long =33.13 MPa, 24.88 kN
d) long =33.13 MPa,
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Engineering Materials 1
Q/
Liquid alloy
-*
With time at
high temperature
Solid grains
freezing from
the liquid
I
tu
Turbine-blade mould
Fig. 20.4. Investment casting of turbine blades. This produces a fine-grained material which may undergo a fair
amo
Case studies in wet corrosion
235
0,+2 H,O
Zn.,
+4e+
. . .
.
. . ., . . . . . . .t4OH-
.
Zn+
.
.,.; ;. Zinc
,
. . . . .
r . :.,I.
,.
Fig. 24.4. Galvanised steel is protected by a sacrificial layer of zinc
At first sight, the answer would seem to be to inc
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Engineering Materials 1
the bottom of the tray to form a line of 'stepping stones' spaced equally (= 3mm) apart
and going straight across the centre of the tray from edge to edge. Cap the top of each
stepping stone with a 6-mm self-adhesive disc. Ligh
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Engineering Materials 1
n
Close-packed plane A
cp plane B added
n
C added
Stacking sequence is ABCAEC
Fg 5.1. The close packing of hard-sphere atoms. The ABC stacking gives the face-centred cubic (f.c.c.)
i.
structure.
important thing to notice is the
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Engineering Materials 1
in atmospheres (e.g. H2) which remove any surface films from the metal. A little
oxygen or H20 greatly reduces p by creating an oxide film which prevents these large
metallic junctions forming.
We said in Chapter 21 that all me
MA2001
MECHANICS OF MATERIALS (MOM)
A/P Tan Soon Huat
Tel: 67904837
Office: N3.2-02-01
Email: [email protected]
1
Refer to Course site for CA details
2
Energy method is not in the syllabus
3
COURSE TEXTBOOK
Mechanics of Materials, Beer F.P., Johnston E.R.
Determine shearing stress due to torque
Stresses at 45 degree due to torque
Ductile and brittle fracture due to torque
Chapter 3
Torsion
Torsion - animation
Torsional Loads on Circular Shafts
(driven)
(driver)
Interested in stresses and
strains of ci
CATALOGUE
(to be used for Design Exercise)
SPUR GEARS
Design Guide Selection of Spur Gears
TABLES:
Z-051 to Z-052: Selection Guide
Z-054 to Z-057: Load Diagrams
Z-101 to Z-113: Standard sizes
Z-151 to Z-154: Standard sizes without hub
Source: NOZAG Gears
Nanyang Technological University
School of Mechanical and Aerospace Engineering
Academic Year 15/16
MA3001 Machine Element Design
Sugar Cane Juice Extraction Machine
Ng Xhi Wei
U1321870A
Tan Chin Hong
U1422428L
Submitted to: Prof Hoon Kay Hiang
Teoh Qi En
Ch 9 Deflection of Beams
Objectives
Develop general elastic curve/deflection form
of a beam
Determine the max deflection of a beam
1
Ch 9 Deflection of Beams
9.1 Introduction
9.3 Equation of Elastic Curve
9.6 Using Singularity Functions
2
9.1 Introducti
Chapter 2
Stress and Strain
Axial Loading
Stress & Strain: Axial Loading
Chapter 2 is concerned with deformation of a
structural member under axial loading. Later
chapters will deal with torsional and pure
bending loads.
Chapter 2 - Stress and Strain -
The importance of FBD to determine equilibrium condition
FBD must include:
- Body weight
- External loads
- All forces across boundary of FBD
For FBD, sum moments (about any point) and sum forces (in any direction) must equate to
zero for equilibrium
Chap 10 Columns
Objectives
To understand buckling
To compute critical buckling load
Topics
10.3 Eulers Formula for Pin-Ended Beams
10.4 Extension of Eulers Formula
1
2
10.3 Eulers Formula for Pin-Ended Beams
x 0, y 0
Buckling load of an axially
loaded
Chapter 4
Pure Bending
Pure Bending
Barbell
Pure Bending: Prismatic members
subjected to equal and opposite couples
acting in the same longitudinal plane
Chapter 4 - Pure Bending
2
Other Loading Types
Eccentric Loading: Axial loading which does not
pass
Ch 7 Transformations of stress & strain
Objectives
Use eqns to perform transformation of plane stress,
compute principal stresses & corresponding principal
planes, max shear stress & corresponding planes,
sketch element showing orientations of principal
Case studies in Friction and wear
253
Fig. 245.4. Conforrnabiliiy o bearings; a conformable bearing material will flow to adjust to minor
f
misalignments.
0.03 mm
0.
Steel backing
strip
Copper-lead or
aluminium-tin
alloy
~
Fig. 216.5.A schematic cross-sec
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Engineering Materials 1
Wet corrosion
Why the dramatic effect of water on the rate of loss of material? As an example we shall
look at iron, immersed in aerated water (Fig. 23.2).
Abraded ion
I
Aerated water
OH
Fig. 23.2. Wet corrosion.
Iron atoms pas
A. Price and availability
Chapter 2
The price and availability of materials
Introduction
In the first chapter we introduced the range of properties required of engineering
materials by the design engineer, and the range of materials available to provide t
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Engineering Materials 1
I
Compression
4
j+-t
Fig. 8.8.
Then, if the stresses in compression and tension are plotted against
the two curves exactly mirror one another (Fig. 8.9). The quantity E is called the true
strain (to be contrasted with the nomina
Case studies in yield-limited design
121
Fig. 12.2. Stresses inside a leaf spring.
Now, to be successful, a spring must not undergo a permanent set during use: it must
always 'spring' back. The condition for this is that the maximum stress (eqn. (12.3)
al
vi
Contents
C. Yield strength, tensile strength, hardness and ductility
8. The Yield Strength, Tensile Strength, Hardness and Ductility
definitions, stress-strain curves (true and nominal), testing methods,
data
77
9. Dislocations and Yielding in Crystals
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Engineering Materials 1
22. Nine strips of pure, fully annealed copper were deformed plastically by being
passed between a pair of rotating rollers so that the strips were made thinner and
longer. The increases in length produced were 1, 10,20,30,40,5