units of h. show all work Steady-state creep rate data is given here for some alloy taken at 200°C (473 K):ės (h¹) σ (MPa)2.3 x 10-3542.2 × 10-267If it is known that the activation energy for creep is 130000 J/mol, compute the steady-state creep rateat a temperature of 270° C (543 K) and a stress level of 50 MPa.Ex: 9Ex: 1.23× 10h-1

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Answered: Steady-state creep rate data is given…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Steady-state creep rate data are given here for some alloy taken at 200°C (473 K): i és (h-¹) 2.2 x 10-3 h-1 2.5 x 10-2 o (MPa) 56 If it is known that the activation energy for creep is 130000 J/mol, compute the steady-state creep rate at a temperature of 230°C (503 K) and a stress level of 50 MPa. 70
Steady-state creep rate data are given in the following table for a nickel alloy at 538 °C (811 K): o(MPa) 10-7 22.0 10 36.1 Compute the stress at which the steady-state creep is 104h' (also at 538 °C).
Calculate the activation energy in j/mol for the creep of an alloy having the steady state creep behavior shown below. Use the data taken at stress level 300MPa and the temperature of 650C and 730C. Assume the stress component n is independent of the temperature.
X Incorrect. Steady-state creep rate data are given here for some alloy taken at 200°C (473 K): (h) a (MPa) 2.5x 10 2.3 x 102 71 If it is known that the activation energy for creep is 160000 /mol, compute the steady state creep rate at a temperature of 220°C (493 K) and a stress level of 48 MPa. the tolerance is +/-9% the tolerance is +/-9%
Question-7. Steady-state creep data taken for an alloy at a stress level of 160 MPa are given below. The stress exponent n for the alloy is 6.8. R is 8.3145 J/mol-K. Compute the steady-state creep rate at 1000 °C and a stress level of 68 MPa. Es (h-1) 6.8 × 10-5 T (°C) 800 8.6 x 10-3 900
In a laboratory creep experiment at 1273K, a steady-state creep rate of 5 ××10-1 %, per hour is obtained in a metal alloy. The creep mechanism for this alloy is known to be dislocation climb with an activation energy of 200 kJ>mol. Predict the service temperature in (°C) for a creep rate of 8.68 ×10-5 %, per hour. (Assume that the laboratory experiment duplicated the service stress.)
Steady-state creep rate data are given here for a metal alloy. R = 8.3145 J/mol-K. %3D T (°C) 550 È, (h-1) 0.6x104 1.1x104 0.9x103 σ(MPa) 150 150 750 250 750 (a) Calculate the activation energy for creep (Qc) in J/mol assuming stress exponent n is independent of temperature. (b) Estimate the creep strain rate at 500 °C when a constant strain of 100 MPa was applied to the same material.
Calculate the activation energy in J/mol for creep for an alloy having the steady state creep behavior shown in the figure. Use the data taken at stress level of 300MPa and temperature of 650C and 730C. Assume that the stress component n is independent of the temperature.
1- Estimate the Yield Strength and/or Ultimate Strengths for the following materials and states whether the material is ductile or brittle: (a) CA655-High Silicon Bronze\ spring temper (b) Carbon Steel 1030\ cold rolled (c) Polypropylene 20-30% glass filled 2- Estimate the Stress-concentration factors (Kt) for: (d) Stainless Steel 17-7 PH (AISI 631)\ hardened (a) D/d= 1.15 & r/d=0.14 D (b) d/W-0.25 & d/h=1.5 (c) D/d= 1.07 &r/d=0.18 M Estimate the fatigue Stress-concentration factors (Kf) for: d M D d D/d= 1.2 & r/d=0.26 M (a) Steel: Sut=70 kpsi & r=3.6mm (b) Heat treated Aluminum: Sut=40 kpsi & r=0.15 in (c) Strain hardened Aluminum: Sut=241 Mpa & r=0.05 in If the loads are static and ox= 22 Mpa oy= -32 Mpa and Txy= 13 Mpa Find the following: (a) 01 & 02 (b) Safe or not? (Graphically) using Tresca, Von mises, and Max normal stress if the material is Ductile Iron 80-55-06 \ annealed. (c) S.F (analytically) if the material is Nylon 11 20-30% glass filled. If the load is static and T=22…
Calculate the activation energy (in J/mol) for creep for an alloy having the steady state creep behavior shown in the figure. Use the data taken at stress level of 300MPA and temperature of 650C and 730C. Assume that the stress component n in independent of the temperature. 1000 800 600 650°C 400 730°C 200 815°C 100 925°C 80 60 40 20 10-6 10-5 104 10-3 10-2 10-1 10 102 103 Steady-state creep rate (h-) Stress (MPa)
Steady-state creep data taken for an iron at a stress level of 136 MPa are given here: If it is known that the value of the stress exponent n for this alloy is 8.3, compute the steady-state creep rate at 1300 K and a stress level of 83 MPa. i Es (h-¹) T(K) 6.7 x 104 1100 8.5 x 10-2 1200 h-1
(6) For an aluminum alloy under constant load, the creep rate increased by a factor of 2 when the temperature was increased from 71°C to 77°C. Find the activation energy and express it in Joule/mole.

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