ENME 382
Homework 1
Due: Friday, Feb. 5, 2010
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. CaO

ENME 382
Section0201
Homework 1
Solution
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 t

ENME 382
Section 0201
HW#9
Due in class on April 30
1. The fatigue data for a steel alloy are given as follows: Stress Amplitude [MPa (ksi)] Cycles to Failure 470 (68.0) 440 (63.4) 390 (56.2) 350 (51.0) 310 (45.3) 290 (42.2) 290 (42.2) 290 (42.2) 1.0 104

ENME 382
Section 0201
Homework 10
Due in class: May 7, 2010
1. Cite the phases that are present and the phase compositions for the following alloys and determine the relative amounts (in terms of mass fractions) of the phases for the alloys and temperatur

ENME 382
Section 0201
Homework 10
Due in class: May 7, 2010
1 Cite the phases that are present and the phase compositions for the following alloys: (a) 25 wt% Pb75 wt% Mg at 425C (800F) (b) 55 wt% Zn45 wt% Cu at 600C (1110F) (c) 7.6 lbm Cu and 144.4 lbm Z

ENME 382
Section 0201
Homework 8
Due in class: April 26, 2010
1 a) 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 crystal of a me

ENME 382 Section 0201
Homework 8
Due in class: April 26, 2010
1. a) The critical resolved shear stress for copper is 0.48 MPa (70 psi). Determine the maximum possible yield strength for a single crystal of Cu pulled in tension. Solution In order to determ

ENME382 Section 0201
Homework 7
Due in class: Friday, April 9, 2010
1. What is meant by the term elastic strain? What is the equation that relates the applied stress to the elastic strain? b. What is meant the term plastic strain? Is there a simple equati

ENME382 Section 0201
Homework 7
1. a. What is meant by the term elastic strain? What is the equation that relates the applied stress to the elastic strain? Elastic strain is recoverable strain. When you remove the stress, the material returns to its origi

ENME 382 Section 0201
Homework 6
Due in class: 2 Apr. 2010
1a) How can you distinguish between steady state and non-steady state diffusion? b) What is the driving force for steady state diffusion? c) When would you expect a vacancy diffusion mechanism? d)

ENME 382
Homework 6
1a) How can you distinguish between steady state and non-steady state diffusion? In steady-state diffusion the diffusion flux and thus the concentration profile are independent of time. There is no net accumulation or depletion of the

ENME 382 Section 0201 HW #5
Due in class on 24 March 2010
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 respective atomic weight

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 respective atomic weights are 171.3 and 162.0 g/mol, determine whether the crystal

ENME 382 Section 0201 1. Callister 4.3
Homework#4 Due in class: Friday, March 5, 2010
Below, molecular weight data for a polytetrafluoroethylene material are tabulated. Compute (a) the number-average molecular weight, (b) the weight-average molecular weig

4.3 Below, molecular weight data for a polytetrafluoroethylene material are tabulated. Compute (a) the number-average molecular weight, (b) the weight-average molecular weight, and (c) the degree of polymerization.
Molecular Weight Range (g/mol)
xi 0.03 0

ENME 382
Section 0201
Homework #2
Due in class 12 Feb. 2010
1. (Callister 3.3) Molybdenum has a BCC crystal structure, an atomic radius of 0.1363 nm, and an atomic weight of 95.94 g/mol. Compute its theoretical density and compare it with the experimental

ENME 382
Homework 1
Due in class: Friday, Feb. 5, 2010
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 calculati