Determine the parameter - Larson-Miller parameters:

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

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

Ask an Expert

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

Write your message here..

Related Questions

Milling, milling machine time calcutation milling machine time calcutation

Which three principal possible in radial drilling machine, Which three prin... Which three principal possible in radial drilling machine Between them the plain drill machine, three principal movements are possible in this type of machine, by vertical move

Equilibrium conditions - non concurrent force system, Equilibrium condition... Equilibrium conditions: What are equilibrium conditions for non concurrent force system? Sol.: For the Equilibrium of non concurrent forces there are three conditions:

Find the value of force to move a system, Find the value of force to move a... Find the value of force to move a system: Th e system of particles shown in the figure given below is initially at rest. Find the value of force F which should be applied so

.computer science and data structure, write an algorithm to calculate simpl... write an algorithm to calculate simple intrest

Find the maximum shear stress - stepped circular bar, Find the maximum shea... Find the maximum shear stress - stepped circular bar: A stepped circular bar ABC 4 m long fixed at one of the end 'A' is subjected to a torque of 10 kN-m. If the portion AB is

Power sources-modern arc welding power sources, MODERN ARC WELDING POWER SO... MODERN ARC WELDING POWER SOURCES Recent advances in the field of solid state power electronics have helped to improve the status of welding power sources. With the development rel

Lifting machine, all information about lifting machine all information about lifting machine

.kleins construction, what is the meant by kleins construction? what is the meant by kleins construction?

What are the approaches to the design of retaining walls, What are the appr... What are the approaches to the design of retaining walls? The approach to the design of retaining walls can be started as follows: a. Chosse a trial dimension of the wall