PROBLEM 2 A part of a machine is subject to the following fluctuating stress of σmax = 55 kpsi and σmin = 20 kpsi applied for 7 (104 ) cycles. If the load changes to σmax = 48 kpsi and σmin = -30 kpsi, how many cycles should the spring survive, using the Gerber criterion? The material is AISI 1040 CD and has a fully corrected endurance strength of Se = 27 kpsi. Assume that f = 0.9. Use Miner’s method.
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why the strength of the polymer will increase if the CRYSTALLINITY level of the structure also rises
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Your COO informed that he would like you to come down and discuss with Strategic Business Unit Manager and Human Resource Office Manager on the execution of the production line improvement project. You are given a chance to hand-picked your project team member and experts. Give your decision on this and provide adequate information of the structure, list of team members and your justification on each position proposed based on the current Covid-19 movement control situation. The company is a manufacturing company, related to mechanical engineering based products.
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Explain the differences between solidification cracking, HAZ cracking, hydrogen induced cracking, and lamellar cracking.
Why is a wide, shallow bead preferred over a narrow, deep weld bead?
Why do some cast irons of the same type have a ferritic matrix and others a pearlitic matrix?
Why are white cast irons considered unweldable?
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Problem 4. Explain to high school level students about streamlines, streaklines, and pathlines. Please explain by inserting a figure if necessary.
問題４．流線、流脈線、流跡線について高校生にわかるように説明しなさい。必要に応じて挿絵(Figure)を入れて説明しなさい。
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A rigid tank A is connected to a spherical and elastic balloon
B. Each contains air at an ambient temperature of 25 ° C. The
volume of tank A is 0.1 m3 and the initial absolute
pressure is
300 kPa. The initial diameter of the balloon is 0.5 m and the
internal absolute pressure is 100 kPa. The tap connecting A and B
is opened and left open. It can be assumed that the pressure inside
the balloon is directly proportional to the diameter of the balloon
and that the final air temperature therein is uniform at 25 ° C.
Determine the final pressure in the system and the final volume of
the balloon.
ans: Pfinal = 137 kPa Vfinal= 0,167 m3
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7. Draw one stress strain diagram for ductile material and indicate the elastic, plastic region, toughness and resilience?
-Explain the mechanism of necking in details?
9. What is the unite for stress and strain?
10. What are the mechanical requirements to design a material for high temperature applications?
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3.- In an industrial process, a concentric tube exchanger is used to cool 1800 Kg / hr of ammonia from 80 ° C to 35 ° C circulating through the annular space, with 1485 Kg / hr of water entering the concentric tube at 25 ° C. The water leaving the exchanger is sent to a mixing tank with agitation, which is fed by another stream of water at 15 ° C in order to reduce its temperature to 25 ° C and reuse it in the heat exchanger. Considering that the specific heat of ammonia is a function of temperature, how many Kg / hr should water be supplied to the mixing tank at 15 ° C?
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A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam enters the first turbine stage at 12 MPa, 560°C and expands to 1 MPa, where some of the steam is extracted and diverted to the open feedwater heater operating at 1 MPa. The remaining steam expands through the second turbine stage to the condenser pressure of 28 kPa. Saturated liquid exits the open feedwater heater at 1 MPa. The net power output for the cycle is 330 MW. Assume that both turbine stages and both pumps have an isentropic efficiency of 75%.
Determine:
(a) the percent cycle thermal efficiency.
(b) the mass flow rate into the first turbine stage, in kg/s.
(c) the rate of entropy production in the open feedwater heater, in kW/K.
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Determine the specific internal energy (in kJ/kg) of water at 400C and 20 MPa.
(Please show how units cancel)!
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Manual Labor in Production Systems Is there a place for manual labor in the modern production system?
Answer: YES
Two aspects
: 1. Manual labor in factory operations
2. Labor in manufacturing support systems
i want solve the 2 question as presentation
thanks
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Question 2:
“The RMS Titanic was an Olympic-class passenger liner, launched for
the
first time in 31 May 1911. The ship’s steel was “probably the best
plain
carbon ship plate of the time”. Nevertheless, shortly before
midnight on 14
April 1912, four days into the ship’s maiden voyage, Titanic hit an
iceberg.
The impact caused the hull to fracture and water poured into the
ship, sinking
it two hours and forty minutes later. Of the 2223 people on board,
only 706
survived. Most of the victims died of hypothermia in the icy -2°C
Atlantic
waters between Southhampton and New York, the destination, where
the
ship sank. There are many factors that contributed to the sinking
of the ship;
one of the primary reasons being metallurgy of the ship’s
hull.”
Explain why even if engineers had tested the steel hull’s material
properties
at room temperature, they still would not have predicted failure
when taking
the impact of the iceberg in the icy Atlantic waters into account.
Also,
describe how the steel should have been tested.
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In Case of Gas power plant, Clearly Identify the at least 12 Important parts. Explain the kind of fuel is used to run the gas power plant. Compare between the Gas power plant and Diesel power plant
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Discuss how the fatigue resistance of a part or material can be improved.
Its for 5 marks so please no short answers.
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