Flow past a sphere at Mach 1.53: An object moving through a fluid at supersonic speed 1Mach number greater than one2 creates a shock wave 1a discontinuity in flow conditions shown by the dark curved l
Motion of water induced by surface waves: As a wave passes along the surface of the water, the water particles follow elliptical paths. There is no net motion of the water, just a periodic, cyclic tra
Impulsive start of flow past an array of cylinders: The complex structure of laminar flow past a relatively simple geometric structure illustrates why it is often difficult to obtain exact analytical
Turbulent jet: The jet of water from the pipe is turbulent. The complex, irregular, unsteady structure typical of turbulent flows is apparent. (Laserinduced fluorescence of dye in water.) (Photography
Flow past a circular cylinder with Re 2000: The pathlines of flow past any circular cylinder 1regardless of size, velocity, or fluid2 are as shown provided that the dimensionless parameter called the
Flow past an inclined plate: The streamlines of a viscous fluid flowing slowly past a two-dimensional object placed between two closely spaced plates 1a Hele-Shaw cell2 approximate inviscid, irrotatio
A jet of water injected into stationary water: Upon emerging from the slit at the left, the jet of fluid loses some of its momentum to the surrounding fluid. This causes the jet to slow down and its w
A vortex ring: The complex, three-dimensional structure of a smoke ring is indicated in this cross-sectional view. 1Smoke in air.2 1Photograph courtesy of R. H. Magarvey and C. S. MacLatchy, Ref. 4.2
An image of hurricane Allen viewed via satellite: Although there is considerable motion and structure to a hurricane, the pressure variation in the vertical direction is approximated by the pressure-d
The break-up of a fluid jet into drops is a function of fluid properties such as density, viscosity, and surface tension. [Reprinted with permission from American Institute of Physics (Ref. 6) and the
Appendices
823
APPENDIX
A
Unit Conversion Tables
1
The following tables express the definitions of miscellaneous units of measure as exact numerical multiples of coherent SI units and provide multiply
Answers to Selected Even-Numbered
Homework Problems
*Problems marked with an * are intended to be solved with the aid of a programmable calculator or computer. Chapter 1.4 1.6 1.8 1.10 1.12 1.14 1.16
Chapter 9: Phase Diagrams
ISSUES TO ADDRESS.
When we combine two elements.
what equilibrium state do we get?
In particular, if we specify.
-a composition (e.g., wt% Cu - wt% Ni), and -a temperature
Professor Mohamad Al-Sheikhly
Department of Materials Science and Engineering and
University of Maryland
College Park, MD
Introduction to Materials Engineering
ENMA 300 and ENME382
Description: Struct
Waqaas Ali
ENMA-300
Metallography
Metallography is basically the study of metals often through the methods of
microcopy. Metal surfaces and fractures are examined with the eye or with a magnifying
gla
ENMA 300 and ENME 382
Homework 1
Due: Friday, Feb. 4, 2011
1. Predict the type of bonding that holds the atoms/molecules together in the following solid
materials. Explain why you have made the predic
HW 4
ENME 382
4.3 Below, molecular weight data for a polytetrafluoroethylene material are tabulated. Compute (a) the numberaverage molecular weight, (b) the weight-average molecular weight, and (c) th
Department of Materials Science and Engineering
University of Maryland
College Park, MD
ENMA 300: Problem Set #3
SOLUTIONS
1. Lattices (2D and 3D)
Identify the lattices and the unit cell in the follow
ENMA 300
Homework 11
Due: Dec 7, 2010
1. This is a combination of problems 10.5 and 10.8 because as a combination they provide
important practice for interpreting phase diagrams. Remember that while b
ENMA 300: Problem Set #10
1. Under what conditions can Ficks first law be used to solve diffusion problems?
It can be used to solve diffusion problems provided the concentration gradient does not
chan
HOMEWORK # 9
Name _
ENMA 300
DUE: Thursday, November 11, 2010
1.
A through-thickness crack of length 0.5 mm grows from a 10 mm diameter hole in a 25
mm thick plate of hardened Al that has the properti
ENMA 300
Homework 8
1a) The critical resolved shear stress for copper is 0.48 MPa (70 psi). Determine the minimum possible
yield strength for a single crystal of Cu pulled in tension.
bi) A single cry
Prof. Rabin: [email protected]; X53382; CHE 1110B
ENMA 300: Problem Set #7
Date Posted: Thr 10/21/10
Time Due: Thr 10/28/10 5PM.
Dislocations
1. A metal crystal has a Burgers vector of length 0.272nm. If t
ENMA 300: Solutions Set #7
Dislocations
1. A metal crystal has a Burgers vector of length 0.272nm. If the lattice parameter a is 0.314, is
the metal crystal structure FCC or BCC?
The Burgers vector is
Department of Materials Science and Engineering
University of Maryland
College Park, MD
ENMA 300: Problem Set #3
1. Lattices (2D and 3D)
Identify the lattices and the unit cell in the following images
Homework # 6
5.5: (a) Atomic radius, crystal structure, electronegativity, and the most common valence are tabulated
below, for several elements. Which of these elements would you expect to form a sub
Homework # 6
5.5: (a) Atomic radius, crystal structure, electronegativity, and the most common valence are tabulated
below, for several elements. Which of these elements would you expect to form a sub
HW 5
ENMA 300
5.1
5.12 Some hypothetical alloy is composed of 25 wt% of metal A and 75 wt% of metal B. If the densities of metals A
and B are 6.17 and 8.00 g/cm3, respectively, whereas their respectiv
HW 5
ENMA 300
5.1 Calculate the fraction of atom sites that are vacant for copper at its melting temperature of 1084degC. Assume
an energy for vacancy formation of 0.90 eV/atom.
5.12 Some hypothetical
HOMEWORK # 9
Name _
ENMA 300
DUE: Thursday, November 11, 2010
1. A through-thickness crack of length 0.5 mm grows from a 10 mm diameter hole
in a 25 mm thick plate of hardened Al that has the properti