Determine the parameter - larson-miller parameters, Mechanical Engineering

Assignment Help:

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


Related Discussions:- Determine the parameter - larson-miller parameters

Element stiffness matrices, Use three frame elements to analyse the frame s...

Use three frame elements to analyse the frame structure as depicted in the image below subjected to combined loadings: a) a concentred load applied  on Element 1  at  its  1/3 leng

Newer approaches to on-line scheduling, Newer Approaches To On-Line Schedul...

Newer Approaches To On-Line Scheduling  The on-line scheduling has established to be superior option than off-line scheduling upon the shop floor. The on-line scheduling looks

Newton ring, What is a newton ring excrement

What is a newton ring excrement

Cracks- hot cracking-cold cracking-base metal cracking, Cracks   Cra...

Cracks   Cracks are the linear ruptures of the metal under stress. Sometimes they appear large and frequently they are narrow separations. The major classification of cracks

Spot welding of different metals-aluminium and its alloys, Spot welding of ...

Spot welding of different metals-Aluminium and its alloys High currents and shorter welding times are necessary for these materials. Special cleaning of the surface is warrante

Selecting dimension commands-autocad, Selecting Dimension Commands    ...

Selecting Dimension Commands                                            The Linear Dimension Commands As the name suggests the Linear dimension commands are used to

Determine the core radius of a multi-mode, Modal Dispersion in Step-Index F...

Modal Dispersion in Step-Index Fibers Determine the core radius of a multi-mode step index fiber with a numerical aperture NA = 0.1 if the number of modes M = 5000 when the wave

Determine work done per second, A nozzle of 50 mm. dia. delivers a stream o...

A nozzle of 50 mm. dia. delivers a stream of water that strikes a flat plate which is held normal to the axis of stream. If the issuing jet has a velocity of 15 m/sec., determine:

Hermite curve, A hermite curve passes through the points (1,0), (0.866, 0.5...

A hermite curve passes through the points (1,0), (0.866, 0.5), (0.5, 0.866), (0,1) which are parameterized at u=0,0.25,0.75,1 respectively. determine geometric coefficient of the c

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd