Student I.D. No._
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ME 3614
January 20, 2012
Quiz 1
1. (5 pts) Assume you work for an engineering consulting company. Your company has signed a contract
to design a storage system for new tires in an existing warehou
Student I.D. No._
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ME 3614
January 27, 2012
Quiz 2
Instructions: Work both problems. If you do not have a calculator, then just plug the numbers into the
appropriate equations or show values as products of number, e
ME 3614
1.
Quiz 10
Student ID No._
April 13, 2012
(2 pts) What type of thread is this? _
What is it used for? _
2. (4 pts) Define the labeled parameters is the figure below.
A:
B:
C:
D:
3. (10 pts) The following equations and tables are supplied for solvi
Student I.D. No._
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ME 3614
February 17, 2012
Quiz 5
Instructions: Answer all questions.
1. (2 pts) If a steel machine element is to be designed with a safety factor of three (3) relative to the
yield stress which is
Student I.D. No._
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ME 3614
February 24, 2012
Quiz 6
Instructions: Answer all questions.
1. (5 pts) The equations for Euler column buckling is
2
Pcr =
C E
2
l
k
()
Define each term in the equation
Pcr
C
E
l
k
2.
(4 p
Student I.D. No._
ME 3614
1.
Quiz 8
March 30, 2012
(3 pts) The standard rotating beam sample is used to determine what key parameter for fatigue
analysis?
_
2. (6 pts) Given the fatigue cycle shown, determine the following:
Mean Stress:
_
Alternating Stre
Student I.D. No._
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ME 3614
February 3, 2012
Quiz 3
Instructions: Answer all questions. If you do not have a calculator, then just plug the numbers
into the appropriate equations or show values as products of number,
Student I.D. No._
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ME 3614
February 10, 2012
Quiz 4
Instructions: Work all problems. Indicate stresses on the elements with arrows acting on appropriate faces
and in the proper direction. Label the arrows with a des
Student I.D. No._
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ME 3614
Quiz 7
March 23, 2012
Instructions: Answer all questions.
1.
(6 pts) List and describe the three stages of fatigue development.
Stage 1 -
Stage 2
ME 3614
Student ID No._
April 6, 2012
(6 pts) Given the Goodman line below with Sy = 80 ksi, Se = 40 ksi and Sut = 100 ksi, calculate the
equivalent reversed loading for a constant amplitude fatigue load that has a maximum stress of 70 ksi
and a minimum s
Structures Loaded in Compression - Stability
Two failure modes when structure is loaded in compression
Material Failure
Structure becomes unstable (can be loaded in the elastic
region of the stress-strain curve
Stability failures can be characterized
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MECHANICAL DESIGN I
ME 3614, Fall 2013, CRN 94592
MCB 113, 12:20 1:10
Professor Brian Y. Lattimer
Randolph 203
231-7295
[email protected]
Office Hours
Tuesday 1-2
Thursday 1-2
false
Book
Richard G. Budynas and J.
Keith Nisbett, Mechanical
Engineering Desig
DWH/ME3614/Spring08/v1.1
Buckling Failure
Buckling
For long, slender columns under compressive load
Sudden, total failure with no advance warning
Critical load (Pcr) is the maximum compressive load the structure can carry before buckling
Analysis for B
ME3614MechanicalDesign
ShearStress,Torsion
Prof.J.Bayandor
VirginiaTech
Summary
Most beams have both shear forces and
bending moments present.
Bending shear stress is maximum at the
neutral axis in bending.
Maximum bending moment occurs at the
point of
ME3614MechanicalDesign
BucklingDesign
Prof.J.Bayandor
VirginiaTech
Summary
A short bar in pure compression by a force along the
centroidal axis shortens by Hookes law until the stress
reaches the elastic limit.
The material of a short compression member
ME3614MechanicalDesign
FBD,Strain,MohrsCircle,Stress
Prof.J.Bayandor
VirginiaTech
Summary
Free Body Diagrams (FBDs) represent the body
as being isolated or free from its
surroundings and will make the determination
of the unknown forces and couples easil
ME3614 Mechanical Design:
Introduction
Prof. Javid Bayandor
Virginia Tech
213D Goodwin Hall
[email protected]
The Design Engineers Professional
Responsibilities
Satisfy the needs of the customer in a
competent, responsible, ethical, and
professional manner
cfw_
Summary of stress analysis
LOADING
CONDITIONS
cfw_
Normal
stresses
FORMULA
SCHEMATICS &
COORDINATES
ADDITIONAL EQUATIONS
y
Axial loading
Beam with circular cross section
x
z
M
My
F
xx
y
z
F = axial load;
A = cross sectional area
h
L
F
b
x
Max.
compre
Student I.D. No._
ME 3614
1.
Practice Test
(4%) Draw the shear and moment diagram for the beam and loading shown. Find values for all
maxima and minima.
2. (3%) A cylindrical pipe is pressurized, has an axial for along the axis of the pipe (x axis), has a
Normal Stress
Normal stresses stretch or compress an element in a
body.
An axially loaded rod produces normal stress. The axial
load is assumed to be uniformly distributed over the
cross-section or
= N/A
Can you find the largest stress in the axially
Stress Due to Two-Axis Bending
Beam cross-sectional shape must be carefully considered
We have only covered the case where a beam cross-section has at least
on axis of symmetry. Problems must be worked using coordinate
systems that correspond to the axis
General State of Stress
3-D Stress State:
Plane Stress:
Plane Strain:
6 components of stress (3 normal and 1 shear)
3 components of stress (2 normal and 1 shear)
4 components of stress (3 normal and 1 shear, assume
isotropic material)
Transformation of St