Materials Science And Engineering Properties
1st Edition
ISBN: 9781111988609
Author: Charles Gilmore
Publisher: Cengage Learning
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Chapter 8, Problem 26CQ
To determine
The test by which the hardenability of steel is measured.
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Given your understanding of what initiates and controls failure in materials, which of the following will increase the failure strength or lifetime of a
test piece or component and why?
a. Decreasing the difference between the maximum and minimum stress values, as this effects the stress concentration factor
b. Decreasing the temperature below the brittle-ductile transition temperature, to make it harder
C. Polishing to reduce surface defects
Od. Increasing its volume, to give a larger cross sectional area
Oe. Increasing the grain size so there are less grain boundaries to initiate failure
For a bronze alloy, the stress at which plastic deformation begins is 275 MPa (40,000 psi), and the modulus of elasticity is 115 GPa (16.7 x106 psi). (a) What is the maximum load that may be applied to a specimen with a cross-sectional area of 325 mm2 (0.5 in.2) without plastic de- formation? (15pts)(b) If the original specimen length is 115 mm (4.5 in.), what is the maximum length to which it may be stretched without causing plastic deformation?(15pts)
(Solid Mechanics) A setup for single-edge-notch-bending (SENB) tests is shown below. Support rollers provide frictionless contact with the specimen, while a load is applied at the middle of the top surface of specimen. The thickness of the specimen is 10 mm and the height W 10mm. The properties for this ductile alloy are E = 70 GPa, v=0.3, σᵧ = 400 MPa, Kᵢ? = 25 MPa.m¹/².
(1) Ignore any crack or defects in the material, what is the maximum static force that the specimen could carry before failure?
(2) A cyclic load of low amplitude 2.8 kN is applied. Because of the cyclic load a defect is nucleated on the edge and grows into a fatigue crack of 2 mm length shown in the right. If the cycling is interrupted, what is the maximum static tensile force that the specimen could carry?
(3) With more cycles, the fatigue crack keeps growing. Estimate the critical crack length (a range is fine) at which the plate will fail from the low-amplitude cyclic load 2.8 kN only. (maximum two iterations are…
Chapter 8 Solutions
Materials Science And Engineering Properties
Ch. 8 - Prob. 1CQCh. 8 - Prob. 2CQCh. 8 - Prob. 3CQCh. 8 - Prob. 4CQCh. 8 - Prob. 6CQCh. 8 - Prob. 7CQCh. 8 - Prob. 8CQCh. 8 - Prob. 9CQCh. 8 - Prob. 10CQCh. 8 - Prob. 11CQ
Ch. 8 - Prob. 12CQCh. 8 - Prob. 13CQCh. 8 - Prob. 14CQCh. 8 - Prob. 15CQCh. 8 - Prob. 16CQCh. 8 - Prob. 17CQCh. 8 - Prob. 18CQCh. 8 - Prob. 19CQCh. 8 - Prob. 20CQCh. 8 - Prob. 21CQCh. 8 - Prob. 22CQCh. 8 - Prob. 23CQCh. 8 - Prob. 24CQCh. 8 - Prob. 25CQCh. 8 - Prob. 26CQCh. 8 - Prob. 27CQCh. 8 - Prob. 28CQCh. 8 - Prob. 29CQCh. 8 - Prob. 30CQCh. 8 - Prob. 31CQCh. 8 - Prob. 32CQCh. 8 - Prob. 33CQCh. 8 - Prob. 34CQCh. 8 - Prob. 35CQCh. 8 - Prob. 36CQCh. 8 - Prob. 37CQCh. 8 - Prob. 38CQCh. 8 - Prob. 39CQCh. 8 - Prob. 40CQCh. 8 - Prob. 41CQCh. 8 - Prob. 42CQCh. 8 - Prob. 43CQCh. 8 - Prob. 44CQCh. 8 - Prob. 45CQCh. 8 - Prob. 46CQCh. 8 - Prob. 47CQCh. 8 - Prob. 48CQCh. 8 - Prob. 49CQCh. 8 - Prob. 50CQCh. 8 - Prob. 51CQCh. 8 - Prob. 52CQCh. 8 - Prob. 53CQCh. 8 - Prob. 54CQCh. 8 - Prob. 55CQCh. 8 - Prob. 56CQCh. 8 - Prob. 57CQCh. 8 - Prob. 58CQCh. 8 - Prob. 59CQCh. 8 - Prob. 60CQCh. 8 - Prob. 61CQCh. 8 - Prob. 62CQCh. 8 - Prob. 63CQCh. 8 - Prob. 64CQCh. 8 - Prob. 65CQCh. 8 - Prob. 66CQCh. 8 - Prob. 67CQCh. 8 - Prob. 68CQCh. 8 - Prob. 69CQCh. 8 - Prob. 70CQCh. 8 - Prob. 71CQCh. 8 - Prob. 72CQCh. 8 - Prob. 73CQCh. 8 - Prob. 74CQCh. 8 - Prob. 75CQCh. 8 - Prob. 76CQCh. 8 - Prob. 77CQCh. 8 - Prob. 78CQCh. 8 - Prob. 79CQCh. 8 - Prob. 80CQCh. 8 - Prob. 81CQCh. 8 - Prob. 82CQCh. 8 - Prob. 83CQCh. 8 - Prob. 84CQCh. 8 - Prob. 85CQCh. 8 - Prob. 86CQCh. 8 - Prob. 87CQCh. 8 - Prob. 88CQCh. 8 - Prob. 89CQCh. 8 - Prob. 90CQCh. 8 - Prob. 91CQCh. 8 - Prob. 92CQCh. 8 - Prob. 93CQCh. 8 - Prob. 94CQCh. 8 - Prob. 95CQCh. 8 - Prob. 96CQCh. 8 - Prob. 97CQCh. 8 - Prob. 98CQCh. 8 - Prob. 99CQCh. 8 - Prob. 100CQCh. 8 - Prob. 101CQCh. 8 - Prob. 102CQCh. 8 - Prob. 103CQCh. 8 - Prob. 104CQCh. 8 - Prob. 105CQCh. 8 - Prob. 1ETSQCh. 8 - Prob. 2ETSQCh. 8 - Prob. 3ETSQCh. 8 - Prob. 4ETSQCh. 8 - Prob. 5ETSQCh. 8 - Prob. 6ETSQCh. 8 - Prob. 7ETSQCh. 8 - Prob. 8ETSQCh. 8 - Prob. 9ETSQCh. 8 - Prob. 10ETSQCh. 8 - Prob. 11ETSQCh. 8 - Prob. 12ETSQCh. 8 - Prob. 13ETSQCh. 8 - Prob. 14ETSQCh. 8 - Prob. 15ETSQCh. 8 - Prob. 16ETSQCh. 8 - Prob. 17ETSQCh. 8 - Prob. 18ETSQCh. 8 - Prob. 19ETSQCh. 8 - Prob. 20ETSQCh. 8 - Prob. 21ETSQCh. 8 - Prob. 8.1PCh. 8 - Prob. 8.2PCh. 8 - Prob. 8.3PCh. 8 - Prob. 8.4PCh. 8 - The frame of a space shuttle type vehicle must...
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- After an inspection it is found that a structural ceramic part has no flaws greater than 100 micrometers in size, calculate the maximum service stress (in MPa) available with SiC. Assume that Y= 1arrow_forward"Torsion Test on Mild Steel"What are the different failure modes of the specimensarrow_forwardQuestion-5 The following engineering stress-strain data were obtained from the tensile test for a 0.2% plain carbon steel. (a) Plot the engineering stress-strain curve for these data. (b) Determine the 0.2 percent offset yield stress for this steel. (c) Determine the tensile elastic modulus of this steel. (d) Determine the ultimate tensile strength of the alloy. (e) Determine the percent elongation at fracture. Engineering stress (ksi) 0 30 55 60 68 72 74 75 Engineering strain (in./in.) 0 0.001 0.002 0.005 0.01 0.02 0.04 0.06 Engineering stress (ksi) 76 75 73 69 65 56 51 Engineering strain (in./in.) 0.08 0.10 0.12 0.14 0.16 0.18 (Fracture) 0.19 Question-6 A 20-cm-long rod with a diameter of 0.250 cm is loaded with a 5000 N weight. If the diameter decreases to 0.210 cm, determine (a) the engineering stress and strain at this load and (b) the true stress and strain at this load.arrow_forward
- A batch of casted mild steel has a modulus of elasticity of 200 GPa and a yield strength of 250 MPa. Calculate for its modulus of resilience. After cold working the steel, the yield strength increases to 310 MPa. Calculate for the percent reduction in the average grain diameter given σo = 70 MPa and k = 0.74.arrow_forwardA cylindrical metal specimen having an original diameter of 10.63 mm and gauge length of 50.1 mm is pulled in tension until fracture occurs. The diameter at the point of fracture is 7.60 mm, and the fractured gauge length is 74.5 mm. Calculate the ductility in terms of (a) percent reduction in area (percent RA), and (b) percent elongation (percent EL). (a) i percent RA (b) i percent ELarrow_forwardThe assembly shown consists of an aluminum shell (E,= 70 GPa, a, = 23.6 × 10-6rC) fully bonded to a steel core (Es = 200 GPa, as = 11.7 x 10-6rC) and the assembly is unstressed at a temperature of 20°C. Considering only axial deformations, determine the stress in the aluminum when the temperature reaches 215°C. 200 mm 20 mm Aluminum shell Steel 50 mm core The stress in the aluminum is MPa.arrow_forward
- The stress-strain tests were carried out on five different metals (A, B, C, D and E) and the results are shown in the figure below. Select the metal for given properties. Stress L ii. iii. iv. V. vi. B Strain Property Highest resistance to plastic strain Lowest stiffness Highest ductility Highest brittleness Highest tensile strength Lowest fracture strength Metal (A, B, C, D or E) Narrow_forward(a) Explain the phenomenon of strain hardening.arrow_forwarda specimen of steel 20 mm diameter with a gauge length of 200 mm is tested to destruction. it has expansion of 0.16mm under a load of 80kn and the load at elastic limit is 160kn.the maximum load is 180kn.the total expansion at failure is 56mm and diameter at neck is 18mmarrow_forward
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