Materials Science And Engineering Properties
1st Edition
ISBN: 9781111988609
Author: Charles Gilmore
Publisher: Cengage Learning
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Chapter 9, Problem 8CQ
To determine
The slope of plot for log of creep strain as a function of log of applied stress.
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6. Steady-state creep rate data are given below for nickel at 1000°C (1273 K). If it is known that the
activation energy for creep is 272,000 J/mol, compute the steady-state creep rate at a
temperature of 850°C (1123 K) and a stress level of 25 MPa (3625 psi).
o[MPa (psi)]
10
15 (2175)
10
4.5 (650)
1.
Draw the typical creep curve of a metal a constant temperature and constant stress,
and indicate the important features of the curve.
(c) A piece of material is subjected to tensile stress of 70 N/mm² in one direction and a compressive stress
of 50 N/mm² in a direction at right angles to the previous one. Find fully the stresses on a plane the normal
of which makes an angle of 40 degree with the 70 N/mm² stress.
Chapter 9 Solutions
Materials Science And Engineering Properties
Ch. 9 - Prob. 1CQCh. 9 - Prob. 2CQCh. 9 - Prob. 3CQCh. 9 - Prob. 4CQCh. 9 - Prob. 5CQCh. 9 - Prob. 6CQCh. 9 - Prob. 7CQCh. 9 - Prob. 8CQCh. 9 - Prob. 9CQCh. 9 - Prob. 10CQ
Ch. 9 - Prob. 11CQCh. 9 - Prob. 12CQCh. 9 - Prob. 13CQCh. 9 - At temperatures above the equi-cohesive...Ch. 9 - Prob. 15CQCh. 9 - Prob. 16CQCh. 9 - Prob. 17CQCh. 9 - Prob. 18CQCh. 9 - Prob. 19CQCh. 9 - Prob. 20CQCh. 9 - Prob. 21CQCh. 9 - Prob. 22CQCh. 9 - Prob. 23CQCh. 9 - Prob. 24CQCh. 9 - Prob. 25CQCh. 9 - Prob. 26CQCh. 9 - Prob. 27CQCh. 9 - Prob. 28CQCh. 9 - Prob. 29CQCh. 9 - Prob. 30CQCh. 9 - Prob. 31CQCh. 9 - Prob. 32CQCh. 9 - Prob. 33CQCh. 9 - Prob. 34CQCh. 9 - Prob. 35CQCh. 9 - Prob. 1ETSQCh. 9 - Prob. 2ETSQCh. 9 - Prob. 3ETSQCh. 9 - Prob. 4ETSQCh. 9 - Prob. 5ETSQCh. 9 - Prob. 6ETSQCh. 9 - Prob. 7ETSQCh. 9 - Prob. 8ETSQCh. 9 - Prob. 9ETSQCh. 9 - Prob. 10ETSQCh. 9 - Prob. 11ETSQCh. 9 - Prob. 12ETSQCh. 9 - Prob. 9.1PCh. 9 - Prob. 9.2PCh. 9 - Prob. 9.3PCh. 9 - Prob. 9.4PCh. 9 - Prob. 9.5PCh. 9 - Prob. 9.6PCh. 9 - Prob. 9.7PCh. 9 - Prob. 9.8PCh. 9 - Prob. 9.9PCh. 9 - Prob. 9.10PCh. 9 - For silver at a tensile stress of 7 MPa and a...Ch. 9 - For germanium at a tensile stress of 410 MPa and a...Ch. 9 - Prob. 9.13PCh. 9 - Prob. 9.14PCh. 9 - Prob. 9.15PCh. 9 - Prob. 9.16PCh. 9 - Prob. 9.17PCh. 9 - Prob. 9.18PCh. 9 - Prob. 9.19PCh. 9 - Prob. 9.20PCh. 9 - Prob. 9.21PCh. 9 - Prob. 9.22P
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- For silver at a tensile stress of 7 MPa and a temperature of 839C , there are two equally contributing creep mechanisms. What are they?arrow_forwarda) plot how the critical stress intensity kc depends on the thickness and explain this?arrow_forwardQ-3 The following creep data were taken on an aluminum alloy at 400°C (750°F) and a constant stress of 25 MPa (3660 psi). Plot the data as strain versus time, then determine the steady-state or minimum creep rate. Time (min) Time Strain (min) Strain 0.00 18 0.82 2 0.22 20 0.88 22 24 4 0.34 0.95 6 0.41 1.03 8 0.48 26 1.12 10 0.55 28 1.22 12 0.62 30 1.36 14 0.68 32 1.53 16 0.75 34 1.77arrow_forward
- A punch of 20 mm diameter is used to punch a hole in 8 mm thick plate. If the force required to create a hole is 110 kN, the average shear stress in the plate will be nearly (a) 410 MPa (b) 320 MPa (c) 220 MPa (d) 140 MPa 95arrow_forwardAnswer the questions given the following stresses: d) The value of the shear stress at any plane inclined at any angle with the horizontal is e) The value of the normal stress at any plane inclined at any angle with the horizontal isarrow_forwardDescribe the term “creep” and the effect of temperature and stress on creep.arrow_forward
- ) State and explain Bligh’s creep theory and write down formulae used for design of a vertical dropweir by Bligh’s theoryarrow_forwardConsider a metal single crystal oriented such that the normal to the slip plane and the slip direction are at angles of 43.1° and 47.9°, respectively, with the tensile axis. If the critical resolved shear stress is 20.7 MPa, will an applied stress of 45 MPa cause the single crystal to yield or slip? If not, what stress will be necessary?arrow_forwardA punch of 20 mm diameter is used to punch a hole in 8 mm thick plate. If the force required to create a hole is 110 kN, the average shear stress in the plate will be nearly 1.410 MPa 2.320 MPa 3. 220 MPa 4. 140 MPaarrow_forward
- 1. Calculate the strain at the centroid of the tension steel in single layer if the effective depth is 250 mm and the depth of neutral axis is 100 mm. answer: 0.0045 2. Calculate the strain at extreme layer of steel if fy=415 MPa and the strength reduction factor is 0.80. answer: 0.0038arrow_forward2. A long steel pipe is subjected to a state of plane strain (ɛzz = Ezx = Ezy = 0) when the design loads are applied. At the critical point in the pipe, the non-zero stress 143.28 MPa , components are found to be oxx = 53.28 MPa , ơyy Oxy 40 MPa and o22 = 57 MPa . The material has a yield stress of = 245 MPa . Determine the factor of safety in the design based on the von Oy Mises criteria.arrow_forwardThe cantilever-reinforced concrete beam shown in Figure 1 is subjected to a uniform load (including beam weight) and a concentrated load at the free end of the beam. 1.) Determine the cracking moment capacity, . 2.) Calculate the maximum unfactored applied moment and state whether the concrete beam has cracked under the applied loads. 3.) Compute the maximum compressive stress of concrete at the bottom of the beam and the maximum tensile stress at the centroid of the steel bars. Can you work it out and show all the steps on paper, and any other helpful little steps to explain the process.arrow_forward
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