Project 2
MEEN 225 502
Jonah Noureddine
The following video displays real-life
footage of the pump-jack mechanism.
The mechanism is powered by a motor, and this
motor drives a pair of cranks. These cranks raise
and lower one end of an I-beam, which is fre
MEEN 315Spring 2016, Exam 2 Name gel/WHWS 9< RWK/
Section Number 506 (Instructor: Sy-Bor Wen)
1. Put name on m page.
2. RELAX, this is only an exam. Read over the whole exam, then decide which problem to work
rst.
Exam is closed book and notes. Tables pro
As I entered this class at the beginning of the semester, my two primary goals were to become
more competent with MATLAB, and to achieve an A in the class. Of course I now have
increased skill with MATLAB and programming in general, compared to how I was
Part (a):
I developed a set of first order ODEs from the given second order ODE by establishing a 2x1 matrix
called dxdt, and then setting dxdt(1) = x(2) and dxdt(2) = (2.5*sin(wt) 5|x(2)|*x(2) 6*x(1)/2 . The
x(2) term corresponds to dx/dt, and the x(1) t
function twoDDeterminateTrussSolver( )
%This is a program that will solve a 2D statically determinate truss
%
The inputs are : Nodes Locations and external forces at each node
%
Truss elements showing which nodes are connected and boundary
%
conditions wh
Task 1:
In this problem, there are 3 intervals, one polynomial for each interval, and each polynomial
possesses four unknown coefficients since they are cubic. This meant that I would need a matrix
composed of twelve equations to determine all of the coef
function
ThreeDDeterminateTruss(
)
NNodes=6 ;
%
the total number of nodes goes here
coordunits=' m';
%
specify the length units here (note the blank spae in front; it is ncessary for
readablity)
NodeR=zeros(NNodes,3);
%
this matrix will contain the x and
Task 2 Questions:
In my code, I used Simpsons 1/3 rule for first and last sets of 3 points of data, and I used the trapezoid
method for the middle 4 points. I elected to not use any of MATLABs built in functions as I only know of
the quad, trapz, and inte
a)
1
= +
ln( 1 ) =
+
+
= +
(ln( 1 )1 =
(ln( 1 )1
The value for is (ln( 1 )1 and the value for is 1/x.
b)
ln() = +
ln()
= +
The value for is
ln()
and the value for is .
c)
= 2()1/2
= 2 +
= 2 +
= ()2
The value for is and the value for is2.
Mohr's Circle Guidelines and Procedures
"ALL STRESS STATES ARE 3-DIMENSIONAL!"
1. Always draw stress cube.
a)
b)
c)
d)
include axes for coordinate system
sketch stress components in 'positive' directions based upon coordinate system
show all 3 normal stre
Chapter 3
1. Crystalline- A material in which the atoms are situated in a repeating or periodic array over
large atomic distances
a. Each atom is bonded to its nearest neighbor atoms
b. All metals and some ceramics and polymers form crystalline structures
It has come to my attention that some questions remain regarding the distinctions between "2-D Mohr's
circle" and "3-D Mohr's circles." This is particularly applicable to problem 3-20. I think we all recognize
that you must use the stress cubic equation t
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DESIGN PROCESS
Texas A&M University
Department of Mechanical Engineering
Systems Approach cost, schedule, performance, safety, environment, ethics,
Need Statement
Function Structure
Conceptual Design
Down Select (performance, cost, & schedule)
Preliminar
1. To be able to explain the fundamentals of engineering stress and strain
a. Tension, compression, normal, shear, torsion
2. Explain the relationship between stress and strain for elastic deformation
3. When solving problems, draw a sketch of what youre
For the quiz:
Weight percent to atomic percent!
Vacancy, substitutional
Consequences of solidification -> defects
Point, line, volume, surface defects
Can add impurities or use thermal processing to vary defects
Defects affect properties, defects typicall
Ionic bonded materials: ceramics
1. Crystal structures
a. and + ions
b. Cations go in the interstitials
c. Use of ceramics is on the rise
2. Structures to know:
a. Metals
b. Ceramics:
i. Elements (c and si)
ii. Classic ceramic structures (NaCl and CsCl)
i
1. Introduction
a. Composites are artificially produced multiphase materials having desirable combinations
of the best properties of the constituent phases.
b. Usually, one phase (the matrix) is continuous and completely surrounds the other (the
dispersed
1. Ohms law
a. Ease with which a material is capable of transmitting an electric current is expressed in
terms of electrical conductivity or its reciprocal, electrical resistivity
b.
c.
d. Conductivity leads to classification as either metal, semiconducto
Chapter 14 Reading Notes-Polymer Structures
1. Hydrocarbon Molecules- Composed of hydrogens and carbons
a. Covalent bond, 4 electrons per carbon that can bond, 2 for hydrogen
b. 1 bond=1 electron from each carbon
c. Unsaturated-Carbons having double or tr
3 a) Grams in one amu: 1.66 * 10^-24
b) Atoms in a pound mole: 2.7315 *10^26.
Atoms in a gram mole: 6.022*10^23
7) Electron Configurations for Fe^2+, Al^3+, Cu^+, Ba^2+, Br^-, and O^2-
11 a) transition metal, as it has an unfilled d energy level
b) noble