From the graph provided it in the book, the following estimates were made:
The range of transition crack sizes for stainless steel is from slightly under 10 mm to
about 100 mm.
The range of transition crack si
o 1)Judicious material selection & material design,
o 2)Environment modification/control (adding inhibitors),
o 3)surface treatment (protective coatings) and adding corrosion
Final Exam Review Sheet
Creep (strain rate)-The time dependent plastic deformation of a material
under constant stress
Temp. at which a material starts to
creep depends on its melting point Tm
As temperature increases: Density & Modul
9 September 2010
Concrete is the cheapest material with E>1GPa.
Cast Irons are the cheapest metals.
PP is the cheapest polymer
Magnesium alloys are more expensive than aluminum alloys.
PEEK is more expensive t
Component Selected: combustion chamber
Reason for selection:
Reduce emissions and increase efficiency: by altering the material of the
combustion chamber walls we can increase the max service temperature, thereby
increasing thermal efficiency.
Aerospace Materials HW 5
a) From the graph shown, finding 10 on the bottom horizontal axis, we move
vertically until we hit liquid (pass the first line, stop at the second one). This
occurs at approximately 280 oC.
d) To get most allowable pressure, we want to maximize KIc2/y. For this problem,
KIc2/y > 5.58 MN/m (with R = 0.1 m, y = 1420 MPa, Y = 1, and = *y).
The Jet Engine
Past: limited combustor exit temperatures due to turbine
and combustor capabilities. Lead to low combustor wall
Green aviation e
The problem our group chose to work was a problem from chapter nine, and involved
determining the principal stress in a wide-flange beam (or I-beam) at points located at the top
and bottom of the web of the beam.
a) I-beams are efficient in carrying shear
The simplest kind of system with two solid phases is called a eutectic system.
A eutectic system contains two solid phases at low temperature. These phases
may have different crystal structures, or the same crystal structure with differen
MAEIMSE 3610 Aerospace Materials: Properties and Applications
Fall, 20 10
Due October 28,2010, 5:00 pm submitted online as a pdf file per Homework instructions.
1. Your notes
2. Lecture notes and recordings
3. Materials: engine
HW assignment 2
5.3) The following plots show the material index for a light, stiff panel on a modulus-density chart with 6
materials left above it. These belong to the Foams and Natural materials classes
HW assignment 1
4.6) Using figure 4.7 in the textbook, I found the following:
The cheapest material with a modulus greater than 1 GPa is concrete.
The cheapest metals are cast irons.
HW Assignment 3
8.8) Using the KIC y chart of figure 8.9 in the text, the following ranges of transition crack
sizes were found in millimeters (mm).
Stainless Steel 5 ccrit 250
Polycarbonate (PC) .7 ccrit