V-M Diagram Review
(15 pts) Loads on an airplane wing are simplified as in the sketch below. The distributed loading shown
includes both the aerodynamic lift and the weight of the wing and its contents. Point loads
corresponding to the weight of the engin
Fatigue Crack Growth
(15 pts) Consider a material for which the Paris equation describing crack growth is given as:
da
= 6.87 10 12 (K ) 3 ,
dN
where da/dN is in units of [m/cycle] and K is in units of MPa(m1/2)
Consider a compact tension specimen as show
MAE 4281
Homework #2
Assigned: 21 January
Due: 28 January
Equilibrium Review
(10 pts) A large canard aircraft with a gross weight of 1600kN is flying in steady level flight
as shown. Locations of the center of gravity of the complete aircraft and the cent
Laboratory #2:
Impact and Flexure Testing
By
Olalekan Fadairo
21st April 2010
Instructor: Steven Diaz
2
Introduction
This lab experiment consisted of two different types of mechanical tests on composite
materials produced in the laboratory. The first of t
Aerospace Structural Design
MAE 4281
Stress
David Fleming
Associate Professor
Aerospace Engineering
1
It would be a good idea for you to review
the concepts of stress transformations,
Mohrs circle, etc. from your Mechanics
of Materials Text.
2
Elasticity:
MAE 4281
Homework #2
Assigned: 19 January Due: 26 January AT BEGINNING OF CLASS
Be sure to format your homework appropriately, using the Formatting Standards document
posted to Canvas.
1. Equilibrium Review (10 pts)
A large canard aircraft with a gross we
1.5
4. Consider a sandwich beam made with aluminum skins and an aluminum honeycomb core loaded as in the figure
below. Given: the beam is to have a span l of 40 inches and a width b of 10 inches.
Material properties are as follows:
Aluminum skins: Aluminu
Stiffened Shear Web Review: Consider the following stiffened shear web structure
Assuming the webs do not buckle, find:
a)
The shear flow in each of the webs (observe the given numbering and sign conventions)
b) The maximum and minimum axial loads in stif
In lab, one of the types of strain gage we will use is Micro-Measurements EA-13-120LZ-120/E
strain gages provided by Vishay Precision Group. www.vishaypg.com/ref/straingages.
a) Explain the designation EA-13-120LZ-120/E as completely as you can based on
i
Aerospace Structural Design
MAE 4281
Stress-Strain Relationships
David Fleming
Associate Professor
Aerospace Engineering
Equations of elasticity:
15 unknowns
Unknowns:
6 Stress components ( )
x y z yz zx xy
6 Strain components (x y z yz zx xy )
3 Displac
Aerospace Structural Design
MAE 4281
Strain Gages
David Fleming
Associate Professor
Aerospace Engineering
Electrical resistance strain gage is a
wire grid on a nonconductive,
flexible backing.
Soldering Tab
Layout Lines
Encapsulation
(Dark grey)
Precision
Aerospace Structural Design
MAE 4281
Sandwich Structures
David Fleming
Associate Professor
Aerospace Engineering
1
Sandwich Structure is comprised of two
(typically) thin face sheets are separated by
a (typically) lightweight core material
Face sheets
als
The following tables present results from my spreadsheet calculations as outlined
above for each of the four cores under consideration. Grey bars indicate cases
where the core shear stress is exceeded and therefore must be rejected.
To get close, I first
In lab, we will use Micro-Measurements EA-13-060LZ-120/E strain gages provided by Vishay
precision group. www.vishaypg.com/ref/straingages.
a) Explain the designation EA-13-060LZ-120/E as completely as you can based on
information available from Vishay
EA
MAE 4281
Homework #4
Assigned:
Due:
09 February
16 February (Tuesday).
1. Elasticity Equations: Stress Equilibrium
The Mechanics of Materials solution for the stresses in a rectangular beam as shown in the
figure are (note that in general, each stress com
MAE 4281
Homework #3
Assigned:
Due:
28 January
4 February
Instability
1. Consider the rigid rod AB supported by a linear spring at B. Assume that the spring is
very long compared to L.
B
a) Assume the rod rotates about pin A by an angle . Determine the ma
MAE 4281
EXAM REVIEW 2
The second exam will be held on Thursday, 23 April 2009
Format: The exam is closed book and closed notes with one exception: Each student may prepare a single 8 x 11
sheet of paper containing any desired formulas, notes or other inf
MAE 4281
EXAM REVIEW 1
The first exam will be held on Thursday, 26 February 2009
Format: The exam is closed book and closed notes with one exception: Each student may prepare a single 8
x 11 sheet of paper containing any desired formulas, notes or other
Given:
x
150 MPa
y
80 MPa
z
25 MPa
xy
35 MPa
yz
15 MPa
zx
50 MPa
a)
Find principle stresses and principle directions (directions of planes upon which principle
stresses act).
b) Find angles between the principle directions
c) Determine the absolute maximu
A plate with original dimensions of 1cm x 1 cm is deformed into the shape shown in the figure. All edges
are straight lines following deformation.
a) Assume that the resulting displacement field is a general linear function in x and y and that there is
no
The assigned question did not ask for the location for the shear center, but the following
shows work necessary to find the shear center, for your information.
Unsymmetric Bending
I have added this solid (not box beam) unsymmetric bending problem to the
s
Problem:
[From an alternate source.] Cut a strip of paper four inches wide. With a knife or scissors cut a
center crack (slit) of length 2a = 1.5 inches in the top half. In the bottom half cut two edge
cracks with a = 0.60 inches. Based on calculations of
Materials
a) Describe the general four digit system of designating aluminum alloys including modifiers
b) In MAE 4284 lab you used two types of aluminum alloy: 2024-T4 and 6061-T6511. Explain
fully the meaning of the designations of these two specific cas
The FAA Federal Aviation Regulations (FAR) are available on-line at:
http:/www.faa.gov/regulations_policies/
a) Explain which type of aircraft are covered by Part 23 and by Part 25. Include specific
quantitative definitions from the FARs.
b) During an air
The increased use of composites in the engineering industry is no secret. Various engineering
disciplines are seeing increasing use for composites in building materials, and as reinforcements.
This move from traditional building and construction grade met