The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
Homework 7 answer
16.12
a) Given some data for an aligned and continuous carbonfiberreinforced nylon 6,6
composite, we are asked to compute the volume fraction of fibers that are required such
that the fibers carry 94% of a load applied in the longitudi
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
MECH 3420 Engineering Materials II:
Homework 1 Crystal structures of ceramics, Sept. 12th, 2016
Due Sept. 22nd, 2016
1. Show that the minimum cationtoanion radius ratio for a coordination number of 4 is 0.225 using
the hard sphere model.
2. The inorgani
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
ME33001 InClass Exercises for Lec 7
For the given state of stress, determine (a) the principal planes, (b) the principal stresses (c) the
orientation of the planes of maximum inplane shearing stress, (d) the corresponding normal stress.
Use equation to
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
ME33001 InClass Exercises for Lec 8
Q1 For the state of plane stress shown, determine the maximum shearing stress when (a)
x = 0 and y = 60 MPa, (a) x = 105MPa and y = 45 MPa, (Hint: Consider both inplane and outofplane shearing stresses.)
Q2 The stat
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
Hong Kong Polytechnic University
Department of Mechanical Engineering
ME33001, Assignment 3
Due Date: Before 5:00PM, 28 Oct. 2016
Notes:
Please hand in hardcopy of your solution. Soft copy will not be accepted.
1) The beam shown is made of a nylon for whi
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
ME33001 InClass Exercises for Lec 9
Q1 Several forces are applied to the pipe assembly shown. Knowing that the pipe has
inner and outer diameters equal to 40 mm and 48 mm, respectively, determine the normal
and shearing stresses at (a) point H, (b) point
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
Hong Kong Polytechnic University
Department of Mechanical Engineering
ME33001, Assignment 2
1) Two temperedsteel bars, each 5 mm thick, are bonded to a 12 mm mild steel bar. This composite bar is
subjected as shown to a centric axial load of magnitude P.
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
ME33001 Assignment 5 (Due on Dec 2nd in Class)
1. [20 marks] For the given state of stress, determine the normal and shearing stresses
after the element shown has been rotated (a) 25 clockwise, (b) 10 counterclockwise.
2. [20 marks] For the state of plane
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
ME33001 Assignment 4 (Due on Nov 18th in Class)
1. [25 marks]
Draw the shear and bendingmoment diagrams for the beam and loading shown and
determine the maximum normal stress due to bending.
(For W250 80, S = 983 103mm3)
2. [25 marks]
3. [25 marks] (a)De
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
Hong Kong Polytechnic University
Department of Mechanical Engineering
ME33001, Assignment 1
Due Date: Before 6:00PM, 3rd Oct. 2016
Notes:
Please hand in hardcopy of your solution. Softcopy will not be accepted.
Question 1 and 3 each carries 10 marks, othe
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
Mechanics of Materials
Reinforced Concrete Beam
jkm
Concrete Beam
2
Concrete Beam
We will examine a concrete beam in bending
P
2
P
2
A concrete beam is what we call a
composite beam
It is made of two materials: concrete
and steel
Concrete is also a co
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
Homework 9 solution
18.21
The conductivity of copper is
18.11
a) The number of free electrons per cubic meter
b)
The number of electrons per copper atom
18.16
Weight fractions of the two phases are first calculated using the phase diagram
information prov
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
18.42. In this problem we are asked to determine the magnetic field required to produce a
Hall voltage of .
Combining Equations 18.18 and 18.20b, and after solving for Bz, we get
18.51.
(a) We are first asked to compute the capacitance. Combining Equation
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
Homework 8 solution
The relationship between overvoltage and current density is
where i0 and are constants for the particular halfcell.
For hydrogen reduction:
For lead oxidation:
Setting
=
and solving for log i leads to
b) corrosion potential
17.18
This
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
NOTES :
1. ALL SLABS ARE 150 THICK EXCEPT FOR STAIRCASE SLABS.
2. UNLESS SPECIFIES OTHERWISE ALL BEAM SIZES ARE
300 x 550 DP IN X  DIRECTION
AND
300 x 600 DP IN Y  DIRECTION
3. ALL COLUMN SIZES TO BE
400 x 500 (2nd FLOOR TO 1st FLOOR)
500 x 500 (1st FLO
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
D
7400
4800
2025
1175
1X1
1X2
1X6
1Y12
1S12
A
1X7
3
1SS1
UP
1 X 40
1Y14
1S15
1S14
1Y11
1 X 19
1Y1a
(200 X 550)
200 200
FIRST FLOOR PLAN
1S13
1Y13
1S9
1S5
1 X 18
24.050
1Y7
2950
1150
300
1Y4
1 X 17
300 1150
1 X 13a(250 X 450)
1Y10
1S1
1SS2
1SS1
1Y1
DN
1 X
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
The University of Hong Kong
Department of Civil Engineering
CIVL1114 Surveying and Drawing
Laboratory Report
Session 2: Triangulation
Submitted by Group 1
Name
ZAHID Waqas
CHAN Wing Lam
HUNG Ming Jak
TAM Sai Kei
SINGH Aayushman
LI Yik Hei
LEE Duncan Richa
The Hong Kong University of Science and Technology
Engineering Material I
MECH 3420

Fall 2014
AERO 214: INTRODUCTION TO AEROSPACE MECHANICS OF MATERIALS
EXAM #2
NAME: MML UIN: .
NOTES!
0 Exam is closed notes and closed book.
0 Please write down your work clearly. I am more interested in how you think through solving a problem.
Let me see how you