Determine the parameter - larson-miller parameters, Mechanical Engineering

Determine the parameter - Larson-Miller parameters:

Larson-Miller parameters for an alloy at tests levels 10 MPa and 30 MPa are determined respectively as 18 × 104 and 16 × 104. Determine the parameter for 20 MPa.

Solution

Write equation

ln σ= k1 m + c1

where, m is Larson-Miller parameters. Use given values

ln 10 = k1 × 18 × 104 + c1  = 2.3

By subtraction

ln 30 = k1 × 16 × 104 + c1  = 3.4

 2 × k1 × 104  = - 1.1

∴ k1  =- 0.55 × 10- 4

∴ c1  = 2.3 + 18 × 0.55 = 12.21

∴  ln σ= - 0.55 × 10- 4 m + 12.21

For

σ = 20 MPa

m =- ln 20 - 12.21 × 104  /0.55

               = 16.75 × 104

Posted Date: 1/23/2013 2:27:47 AM | Location : United States







Related Discussions:- Determine the parameter - larson-miller parameters, Assignment Help, Ask Question on Determine the parameter - larson-miller parameters, Get Answer, Expert's Help, Determine the parameter - larson-miller parameters Discussions

Write discussion on Determine the parameter - larson-miller parameters
Your posts are moderated
Related Questions
Q. Explain about Postweld Heat Treatment? Pressure vessels shall be postweld heat treated per applicable sections, in accordance with applicable material specifications or when

What is strap footing? Strap Footing You have to use cantilever or strap footings when the proximity of a property line precludes the use of other types for example an isola

What are main important terms included in the footings? Term included in the footings: a. described different types of footings and the process of selecting each type, b.

Function of screw conveyor with auger "To spread the road making raw material on the road during the operation"An auger/cut off assembly for a floating screed asphalt paver. Th

(a) What are the functions of lubrication system? (b) Define the working of lubrication system used for internal parts of engine. (c) What is chasis lubrication system? Descr

Q. Inspection of Flange assembly? Flanges shall be clean and free of old gasket fragments, scratches, burrs, pits, etc. if needed, the flange surfaces shall be cleaned with a s


full defination

Seam Welding Seam welding is different from spot welding by the fact that roller type electrodes are used in the former case. The principle and process of welding are the same

Determine the forces in strings: The Electric light fixture weighing 15N hangs from point C , by two strings AC and BC . AC is inclined at 60° to the horizontal and BC