In a connection using 5/8-inch Φ (UNF-18, SAE Grade 8) bolts, each bolt is subjected to a varying axial load between 10 Kips to 20 Kips. Bolts can be preloaded between 0% (none) and 100%, at 10% intervals, of their proof strength.

What range of preload is ideal so that the fatigue life of this joint is infinite without join separation?

Use Modified Goodman Criteria for fatigue and show calculations for the preload levels between 0% and 100% (or at least the two cases of 0% and 50%). Calculate max stress and factor of safety for infinite life vs. preload as % of proof strength; find gross yielding & joint separation of bolts; then establish a workable range and ideal value for preload.

1. Explain the difference between Plane Stress problem and Plane Strain Problem. Give an example.

2. What is the displacement boundary condition you would like to apply after cutting through the symmetric line?

3. What are the FEA results we would be interested in 2-D stress-strain analysis?

4. What are the material properties to be input in 2-D stress-strain analysis?

5. What are the two sources of errors in FEA modeling? Explain.

An oil cooler for a large diesel engine is to cool engine oil from 60 to 45 °C, using seawater at an inlet temperature of 20 °C with a temperature rise of 15 °C. The design heat load is 140 kW, and the mean overall heat transfer coefficient based on the outer surface area of the tubes us 70 W/m2°C. Calculate the heat transfer surface area for single pass (a)- counter flow and (b)- parallel flow arrangements.

Air enters the compressor of an ideal air standard Brayton cycle at 100 kPa and 290 K with a mass flow rate (m^⋅) of 6 kg/s. The compressor pressure ratio is 10. The turbine inlet temperature is 1500 K. If a regenerator with an effectiveness of 70% is incorporated in the cycle, determine (a) the thermal efficiency (η_th,Brayton) of the cycle. Use the PG model for air. (b) What-if Scenario: What would the thermal efficiency be if the regenerator effectiveness increased to 90% ?

What is the accuracy and precision of using a ball screw of 0.5 diameter in designing a table of motion that is 48 inch in x and y direction?

ABS - Tyres size exchange and how it affects ABC

A U-tube manometer employs a special oil having a specific gravity of 0.2 for the manometer fluid. One side of the manometer is open to local atmospheric pressure of 24.3 inHg and the difference in column heights is measured as 10 cm±1.0 mm when exposed to an air source at 35◦C. Standard acceleration of gravity is present. Calculate the pressure of the air source in pascals and its uncertainty.

1. (a)Plot the Voltage vs. Displacement graph of LVDT Transducer by moving the core in steps of 0.1mm in both Left and Right directions. (b)Calculate the Sensitivity of LVDT Transducer from the above graph. (c) What is the relationship between input voltage and output voltage of Transformer, given N1, N2 are number of turns in the primary and secondary coils respectively?

Tensile testing

can someone tell me how to calcualte the true strain, engineering strain, true stress and engineering stress of the following data o got from tensile testing machine. I assumed area to be constant during the test

i need to draw the curves of the true and engineeing in excel please

Tensile testing

can someone tell me how to calcualte the true strain, engineering strain, true stress and engineering stress of the following data o got from tensile testing machine. I assumed area to be constant during the test

i need to draw the curves of the true and engineeing in excel please

Discuss in detail about the advantages/disadvantages of compressors in refrigeration systems. Give practical examples of compressors in vapor and/or absorption refrigeration system.

Please write down references if any.

a- Do you consider hardness an important mechanical property? why? (specify few examples).

b- Comprare and distinguish between the Vickers, Brinell, and Rockwell tets.

c- which of the following have the highest hardness and why?

Brass, Mild steel, Aluminum

d-What is the purpose of microscope used in Brinell hardness test?

Explain the ggeometrically necessary dislocation(GND) in comparison with statistically stored dislocation(SSD)

A 3/4" diameter hole is to be drilled through 3/4" thick piece of steel plate. The twist drill is to be fed at 0.025 ipr. Maximum cutting speed of 70 fpm is recommended.

Calculate:

A) Cutting time

B) Metal Removal Rate (MRR)

0.1 kg of air (ideal gas) is contained in a closed, rigid tank of volume 0.04 m^3 at 500 K. A paddle wheel stirs the air and transfers energy to the air at a constant rate of 1 kW for 100s. The temperature of the air increases to 600 K.

(a) What is the final pressure of the air (kPa)

(b)Calculate the heat transfer (kJ) for the process (use a constant, average specific heat)