Homework #4
Name _
ENMA 300/ENME 382
Due Monday, October 1, 2012, 5 pm
1. A crystal is said to be isotropic if the elastic modulus in the <100>, <110> and
<111> families of directions are the same.

ENMA 300
Homework 1
Due: Monday, Sept. 12, 2011
1. Predict the type of bonding that holds the atoms/molecules together in the following solid
materials. Explain why you have made the prediction for each material. Where appropriate
include calculations.
Ca

ENMA 300
Homework 1
Due: Monday, Sept. 11, 2011
Note: You should get in the habit of showing your work even if you can solve a problem in your
head. Reasoning is important and you need to show work to show your reasoning process.
1. Predict the type of bo

ENMA 300/ENME 382
Homework 2 Solutions
Due: Wednesday, Sept. 17, 2014
1. The bond-energy curves for two engineering materials are shown on
the curve to the right. Your task is to select the better material for use in
each application described below. Expl

ENMA 300
Homework 1
Note: You should get in the habit of showing your work even if you can solve a problem in your
head. Reasoning is important and you need to show work to show your reasoning process.
1. Predict the type of bonding that holds the atoms/m

ENMA 300/ENME 382
Homework 4 Solutions
Fall 2014
1. Give the Miller indices of the planes A and B in the cubic unit cell below.
Plane A: (Choose origin as front, right, bottom corner of the unit cell)
Intercepts
Reciprocals
Indices
h
-1
-1
-1
k
-1
-1
-1
l

ENMA 300/ENME 382
Homework 7 Diffusion
Due: Monday Oct 29, 2012
Read Chapter 6, Callister 4th edition.
1) a) For substitutional diffusion of zinc in copper, Do = 2.4 x 10-5 cm2/s and Ea = 1.96 eV.
Calculate the diffusion coefficient of zinc in copper at 6

ENMA 300/ENME 382
HW 12
1. Suppose that a wing component on an aircraft is fabricated from an aluminum alloy that has a plane strain
fracture toughness of It has been determined that fracture results at a stress of 365 MPa when the maximum
internal crack

ENMA 300 Fall 2012
Homework 6
Due Oct 23, 2012
8
3
1) Gold has 5.82x 10 vacancies/cm at equilibrium at 300 K. What fraction of the
atomic sites is vacant at 600 K? Gold has a density of 19.302 g/cm3 and an atomic
mass of 196.97 g/mol.
The number of vacanc

10/30/2014
Lesson 25: MECHANICAL PROPERTIES IV
Lesson Objectives:
1. Complete concept of hardness.
2. Understand the concept of factor of safety.
Reading Assignment:
1. Callister, Chapter 7.1-7.16
Homework Assignment:
Homework No. 7 Due Wednesday, October

10/30/2014
Lesson 20: DIFFUSION II
Lesson Objectives:
1. Describe the macroscopic effects of diffusion.
2. Understand Ficks First and Second Laws.
3. Solve steady-state diffusion problems using Ficks First Law.
4. Solve non-steady state diffusion problem

10/30/2014
Lesson 19: Mid-Term I
Please sit every other seat, i.e. one space between you and the student next to you.
Place your coat and book bags at the sides of the lecture room.
You are allowed one calculator, one straight edge, pencils or pens, erase

10/30/2014
Lesson 18: DIFFUSION I
Lesson Objectives:
1. Understand how to do composition conversions.
2. Define diffusion, explain why it occurs, and mechanisms involved (vacancy, interstitial, and
exchange or ring).
3. Describe the three different diffus

10/30/2014
Lesson 17: LINE, SURFACE, AND VOLUME DEFECTS
Lesson Objectives:
1. Review line defects (dislocations).
2. Introduce the concept of slip and the importance of line dislocations.
3. Identify and explain surface, interface, and volume defects in m

10/8/2014
Lesson 16: LINE, SURFACE, AND VOLUME DEFECTS
Lesson Objectives:
1. Identify and explain point defects in ceramics to include Frenkel and Schottky defects.
2. Identify and explain line, surface, and volume defects in metals.
3. Understand how to

10/30/2014
Lesson 21: DIFFUSION III
Lesson Objectives:
1. Complete in-class problems 1 and 2.
Reading Assignment:
1. Callister, Chapter 6.1-6.7
Homework Assignment:
Homework No. 6 Due Wednesday, October 22, 2014 (Check CANVAS)
Homeworks are to be turned i

12/9/2014
Lesson 30: EQUILIBRIUM PHASE DIAGRAMS II BINARY ISOMORPHOUS PHASE
DIAGRAMS AND MICROSTRUCTURE, BINAY EUTECTIC PHASE DIAGRAMS
Lesson Objectives:
1. Understand how to determine phases present, phase composition, and fractional amount of each phase

10/30/2014
Lesson 22: MECHANICAL PROPERTIES I
Lesson Objectives:
1. Understand the definition of mechanical properties.
2. Identify different mechanical properties.
3. Understand the difference between elastic and plastic deformation.
4. Understand in det

10/30/2014
Lesson 24: MECHANICAL PROPERTIES III
Lesson Objectives:
1. Complete in-class problem.
2. Understand mechanical behavior in ceramics and polymers.
3. Understand the the concept of hardness.
4. Understand the concept of factor of safety.
Reading

11/10/2014
Lesson 30: EQUILIBRIUM PHASE DIAGRAMS I BASICS AND BINARY ISOMORPHOUS
PHASE DIAGRAMS
Lesson Objectives:
1. Review cold working, grain size reduction, and solid solution strengthening.
2. Understand the concept of a phase and equilibrium.
3. Und

11/10/2014
Lesson 26: SLIP AND PLASTIC DEFORMATION IN METALS
Lesson Objectives:
1. Understand the concept of slip and slip systems.
2. Understand the concept of resolved shear stress and critical resolved shear stress.
3. Understand deformation in metals.

11/10/2014
Lesson 27: SLIP AND DEFORMATION IN CERAMICS AND POLYMERS
Lesson Objectives:
1. Understand the concept of resolved shear stress and critical resolved shear stress.
2. Complete plastic deformation in metals.
3. Understand deformation in ceramics

10/8/2014
Lesson 15: POINT DEFECTS
Lesson Objectives:
1. Identify and explain vacancies, interstitial point defects, and substitutional point defects in metals and
alloys
2. Identify and explain point defects in ceramics to include Frenkel and Schottky de

10/8/2014
Lesson 14: POLYMER RECYCLING
Lesson Objectives:
1. Complete in-class problems on polymer molecular weight and crystallinity.
2. Be familiar with different recycled polymer applications.
3. Be familiar with how different materials (particularly p

ENMA 300/ENME 382
Homework 12 Solutions
Fall 2014
Engineering Ethics:
1. Go on the web and identify two trustworthy websites to learn more about engineering ethics. For each
website: (1) write the URL; (2) state why you believe it is a trustworthy website