a) Assume that you have two AISI 1045 cylindrical samples with two different diameters: one 1 in. thick and the other 2 in. thick. You astenitize and quench both samples in water. Then you cut a section and measure the hardness at the center of each sample. Would you expect to get the same results? Explain your answer.

b) Assume that you have two cylindrical steel samples with 1 in. diameter, one made out of AISI 1045 and another one made out of AISI 4140. You austenitize and quench both samples in oil. Then you cut a section and measure the hardness at the center of each sample. Would you expect to get the same results? Explain your answer.

At mechanics of metal cutting,

I cannot understand the reason why the shear angle is smaller when the cutting speed is slow.

can you explain this to me?

STAR CCM+

Can someone please explain in your own words the "law of wall " for turbulent flow 3D.

what is wall Y+ value.

Precision Machining Technology (2nd Edition)

Chapter 8SU8, Problem 6RQ

Why should a toolpath be verified on the screen of a CAM system prior to creating the program code?

Thanks!

Ship accident due to loss of resilience.

Find the Cases of accidents, causes of accidents, and solutions.

A rigid tank of volume 0.63 m3 initially has some air inside at 0.5 bar and 300 K. A hole develops in the wall, and air from the surroundings at 1 bar, 300 K flows in until the pressure in the tank reaches 1 bar. Heat transfer between the contents of the tank and the surroundings is negligible. Determine the final temperature in the tank, in K. What is the entropy generation of the process?

(Please treat the air as ideal gas with cp=1.001 kJ/kg?K and cv=0.714 kJ/kg?K)

What is an autoclave and why would you use one?

3) Sketch a vacuum bag setup (label all the layers). Explain what benefits are gained by vacuum bagging.

1) What are the differences between the wet lay-up approach and the prepreg approach in hand lay-up? Include both process differences and differences in the final product. Make a list.

• Differences  

• Similarities

Use superposition to solve for applied stresses on a cantilever beam

Soybean oil at 30 degress Celsius is to be pumped from an open vat through 60 m of standard galvanized iron pipe (internal diameter of 9 cm) into the top of a stroage tank that is 17 m above the surface of the vat. The pipeline contains 3 type B elbows and a gate valve. It is desired to pump the oil at 13.7 m^3/hr.

1) How much work head must be added by a pump at this pumping rate?

2) Assuming 75% efficiency, what size motor (watt) would the pump require?

3) What percentage of the total frictional head loss is due to pipe friction alone (major losses)?

Consider a light, single-engine, propeller-driven, private airplane, approximately modeled after the Cessna T-41A. The characteristics of the airplane are as follows: wingspan = 35.8 ft, wing area = 174 ft², normal gross weight = 2950 lb, fuel capacity = 65 gal of aviation gasoline, the parasite drag coefficient C_D,0 = 0.025, Oswald efficiency factor = 0.8 and propeller efficiency = 0.8. The power plant comprises one-piston engine of 230 hp at sea level. Calculate the maximum velocity of the airplane at sea level. (Round the final answer to one decimal place.)

5a--Pump cavitation can cause impeller problems. With spectra describe how you would detect it using
vibration analysis. Be sure to include both low and high frequency indications.

5b-Why oil analysis may be required when vibration analysis can help finding the fault? cite and
exqmple.

Mat Lab Question

Mat Lab Question:

%% Q1 (60%)
% Follow the steps below to complete this question.
%
% Step 1: (40%)
% Create a function to perform calculations: +, -, *, or /
% 1.1 The function name should be calc and saved in its file.
% 1.2 The function has three parameters a, b, and op. The op is an
% operator.  
% 1.3 The function returns variable r for the calculation result.
% 1.4 The function should provide the following help text:
% "The calc is a simple calculator. It has three parameters.
% The first two parameters are numerical operands, and the third one
% is an operator +, -, *, or / "
% 1.5 Use the if conditional statement in the funciton to check the operator op
% and compute accordingly.
% Note: Example about the syntax to check a single character: if(op == '+')
% Note: You can test the calc function in the Command Window using the syntax:
% >> calc(5, 3, '+')
% You can display the help text:
% >> help calc
%
% You can check if a division is divided by 0, but this is not required. Hint: use Inf or NaN
%

%% Q2 (15%)
% This question is similar to the requirement in Step 1 of Q1, except the
% following:
% Function name: calc_switch.m
% Here you want to use the switch statement instead of the if statement to check the operator.
% You are not required to do Steps 2-4 in Q1. But you can test this function in the same way.

Dry, compressed air at Tm,i = 85°C, p = 20 atm, with a mass flow rate of m?? = 0.005kg/s, enters a 30-mm- diameter, 5-m-long tube whose surface is at Ts = 25°C.

Determine the thermal entry length, the mean temperature of the air at the tube outlet, the rate of heat transfer from the air to the tube wall, and the power required to flow the air through the tube. ?