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How to we know that open circuit potential (gamry setup) has become stable?

by seeing the graph

by seeing the graph

explain how test procedures produce results

of use to an engineer. Think about what sort of information they will want if they are going

to use the results of the tests to inform the design of a product, e.g. in the case of a

tensile test, the final breaking load is only one of at least five other pieces of data that

can found if the test procedure is correct. Write an explanation (about 500 words) of how

one destructive and one non-destructive test procedure can be carried out so that they

produce results that are useful to an engineer.

of use to an engineer. Think about what sort of information they will want if they are going

to use the results of the tests to inform the design of a product, e.g. in the case of a

tensile test, the final breaking load is only one of at least five other pieces of data that

can found if the test procedure is correct. Write an explanation (about 500 words) of how

one destructive and one non-destructive test procedure can be carried out so that they

produce results that are useful to an engineer.

The length of Lead piping in the plant is 50 m long at a temperature of 160C. When hot water flows

through it the temperature of the pipe rises to 800C. The coefficient of linear expansion of lead is

29 10-6 0 K

-1

.

i) Determine the change in length of the hot pipe.

This part of the task provides part of the evidence for the grading criterion P8.

ii) Determine the compressive force induced in the pipe if it is rigidly held and expansion is

prevented.

This part of the task provides the evidence for the grading criterion M4.

through it the temperature of the pipe rises to 800C. The coefficient of linear expansion of lead is

29 10-6 0 K

-1

.

i) Determine the change in length of the hot pipe.

This part of the task provides part of the evidence for the grading criterion P8.

ii) Determine the compressive force induced in the pipe if it is rigidly held and expansion is

prevented.

This part of the task provides the evidence for the grading criterion M4.

Using diagrams to illustrate your answers, describe the following failure modes and the

scientific principles that relate to them:

1. ductile/brittle fracture

2. fatigue

3. creep.

For each, make reference, where appropriate, to loading conditions, grain size, surface

finish, stress concentrations, the appearance of the failed surface, stages of creep,

effects of temperature.

scientific principles that relate to them:

1. ductile/brittle fracture

2. fatigue

3. creep.

For each, make reference, where appropriate, to loading conditions, grain size, surface

finish, stress concentrations, the appearance of the failed surface, stages of creep,

effects of temperature.

A heat exchanger produces dry steam at 100°C from feed water at 30°C at a rate of 1.5 kgs−1. The heat exchanger receives heat energy at a rate of 600 kW from the fuel used. The specific heat capacity of water is 4187 Jkg−1K−1 and its specific latent heat of vaporisation is 2257 Jkg−1.

i) Determine the heat energy received per kilogram of steam produced.

i) Determine the heat energy received per kilogram of steam produced.

TASK 1

A brass tie bar of length 500 mm and diameter 20 mm undergoes a change in temperature from 25°C to 135°C. The linear expansivity of copper is 19 × 10−6°C−1 and its modulus of elasticity is 84 Gpa.

i) Determine the change of length that takes place.

This part of the task provides part of the evidence for the grading criterion P8.

ii) Determine the compressive force induced in the bar if it is rigidly held and expansion is prevented.

A brass tie bar of length 500 mm and diameter 20 mm undergoes a change in temperature from 25°C to 135°C. The linear expansivity of copper is 19 × 10−6°C−1 and its modulus of elasticity is 84 Gpa.

i) Determine the change of length that takes place.

This part of the task provides part of the evidence for the grading criterion P8.

ii) Determine the compressive force induced in the bar if it is rigidly held and expansion is prevented.

TASK 3

a) A single cylinder petrol engine has a volume compression ratio of 8:1, takes in a mixture of fuel and air at a temperature of 250°C and its pressure is 101 kPa. If the pressure at the end of the compression stroke is 1.5 MPa what will be its final temperature?

b) A compressed air storage cylinder has a volume of 0.5 m3 and contains air at an absolute pressure of 1.8 MPa and temperature 20°C. A quantity of the air is released during which the temperature of the remaining air falls to 15°C and the pressure to 1.5 MPa. Calculate the mass of the air released. The characteristic gas constant for air is 287 Jkg−1K−1.

a) A single cylinder petrol engine has a volume compression ratio of 8:1, takes in a mixture of fuel and air at a temperature of 250°C and its pressure is 101 kPa. If the pressure at the end of the compression stroke is 1.5 MPa what will be its final temperature?

b) A compressed air storage cylinder has a volume of 0.5 m3 and contains air at an absolute pressure of 1.8 MPa and temperature 20°C. A quantity of the air is released during which the temperature of the remaining air falls to 15°C and the pressure to 1.5 MPa. Calculate the mass of the air released. The characteristic gas constant for air is 287 Jkg−1K−1.

A brass tie bar of length 500 mm and diameter 20 mm undergoes a change in temperature from 25°C to 135°C. The linear expansivity of copper is 19 × 10−6°C−1 and its modulus of elasticity is 84 Gpa.

i) Determine the change of length that takes place.

This part of the task provides part of the evidence for the grading criterion P8.

ii) Determine the compressive force induced in the bar if it is rigidly held and expansion is prevented.

i) Determine the change of length that takes place.

This part of the task provides part of the evidence for the grading criterion P8.

ii) Determine the compressive force induced in the bar if it is rigidly held and expansion is prevented.

I have been given values of properties of a CFRP material and asked to calculate a number of matrix (transformation etc). I have done this but I am now asked to calculate the stresses and strains in the 1-2 directions.

Please could you help me? I don't know what equation I should use.

I know to calculate the strains in the x-y direction you use the following;

{εxy }= [s ̅ ]{σxy }

Please could you tell me the matrix to use for;

1. the stresses in the 1-2 directions

2. the strains in the 1-2 directions.

Thank you in advance

Please could you help me? I don't know what equation I should use.

I know to calculate the strains in the x-y direction you use the following;

{εxy }= [s ̅ ]{σxy }

Please could you tell me the matrix to use for;

1. the stresses in the 1-2 directions

2. the strains in the 1-2 directions.

Thank you in advance