Q1: Select the correct answer.up toA. Resilience is the energy absorbed by the materiala. yield.b. ultimate sensile stress.c. fracture.B. The grain boundaries area. less chemically active than grains themselves.b. the regions of orientation mismatch of the neighbouring grains.c. classified as linear defects.C. All polycrystalline materials are considered as isotropic becausea) they have crystallographic direction-mechanical properties independence relationb) all the crystals' orientations are the samec) the random direction of many grains cancels the anisotropic effectD. Dislocations slip process in metallic crystalline materialsa) is essential to explain why the metals exhibit much lower strength than thattheoretically predicted based on metallic bonding.b) makes metals and alloys brittle.c) cannot be used to control the mechanical properties of metallic materialsE. The atomic stacking ABCABCABC is ford) FCC crystal structuree) BCC crystal structuref) HCP crystal structureF. Which of the following classified as interfacial defects?a) grain boundaryb) vacanciesc) dislocationsG. Hall-Petch equationa. proposes an inverse relation between the grain size and the yield strength.b. is valid for all grain sizes.c. proposes enhancing the mechanical properties (hardness and strength) byincreasing the grain size.H. In tensile testing, nicking occurs aftera) the yield point.b) fracture.c) the ultimate tensile stress point.1. Electropositive elements area) capable to give up their valance electronsb) capable to accept electronsc) neither give up nor accept electronsJ. Solid solution strengthening occurs whena. dislocations interrupt each otherb. dislocations face impurities atomsc. grain size is smaller(

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Q1: Select the correct answer. ( A. Resilience is the energy absorbed by the material up to a. yield. b. ultimate sensile stress. c. fracture. B. The grain boundaries are a. less chemically active than grains themselves. b. the regions of orientation mismatch of the neighbouring grains. c. classified as linear defects. C. All polycrystalline materials are considered as isotropic because a) they have crystallographic direction-mechanical properties independence relation the same

Q1: Select the correct answer. ( A. Resilience is the energy absorbed by the material up to a. yield. b. ultimate sensile stress. c. fracture. B. The grain boundaries are a. less chemically active than grains themselves. b. the regions of orientation mismatch of the neighbouring grains. c. classified as linear defects. C. All polycrystalline materials are considered as isotropic because a) they have crystallographic direction-mechanical properties independence relation the same

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

Q1: Select the correct answer.
up to
A. Resilience is the energy absorbed by the material
a. yield.
b. ultimate sensile stress.
c. fracture.
B. The grain boundaries are
a. less chemically active than grains themselves.
b. the regions of orientation mismatch of the neighbouring grains.
c. classified as linear defects.
C. All polycrystalline materials are considered as isotropic because
a) they have crystallographic direction-mechanical properties independence relation
b) all the crystals' orientations are the same
c) the random direction of many grains cancels the anisotropic effect
D. Dislocations slip process in metallic crystalline materials
a) is essential to explain why the metals exhibit much lower strength than that
theoretically predicted based on metallic bonding.
b) makes metals and alloys brittle.
c) cannot be used to control the mechanical properties of metallic materials
E. The atomic stacking ABCABCABC is for
d) FCC crystal structure
e) BCC crystal structure
f) HCP crystal structure
F. Which of the following classified as interfacial defects?
a) grain boundary
b) vacancies
c) dislocations
G. Hall-Petch equation
a. proposes an inverse relation between the grain size and the yield strength.
b. is valid for all grain sizes.
c. proposes enhancing the mechanical properties (hardness and strength) by
increasing the grain size.
H. In tensile testing, nicking occurs after
a) the yield point.
b) fracture.
c) the ultimate tensile stress point.
1. Electropositive elements are
a) capable to give up their valance electrons
b) capable to accept electrons
c) neither give up nor accept electrons
J. Solid solution strengthening occurs when
a. dislocations interrupt each other
b. dislocations face impurities atoms
c. grain size is smaller
(

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b) A 1.25 m long cable has a diameter 3.50 mm with a Young's Modulus, E, of 9.75 x 10⁹ N/m². When the wire is placed under tension, it experiences a stress of 202.52 x 106 N/m², the length of the cable extends by 36.35 mm. Calculate the force that the cable experiences under tension and the strain energy density (U/V) due to deformation. Give your answers in newtons (N) to 2 decimal places for the force; and in joules per cubic metre (J/m³) for the strain energy density to 2 decimal places. Assume the cable is solid and the material is homogeneous. c) Figure Q1c shows a bracket on rollers that allow the bracket to move along a beam in the horizontal direction. A force F₁ of 2625 N acts at point A where the angle between F, and the x-axis is 100. If force F₂ acts at an angle a = 400 between F2 and the y-axis: (i) Determine the magnitude of F2 necessary to maintain bracket on horizontal equilibrium. (ii) Determine the vertical force at A acting along the y-axis. Give your answers to the…
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