### Mechanical Engineering Concepts#### (g) StrainStrain is a measure of deformation representing the displacement between particles in a material body. Consider the following statements about strain:- ___ cannot be determined at a point because it requires a reference length.- ___ is not dimensionless but is in units of %.- ___ is always the response to a controlled stress, not the other way around.- ___ tensors are not symmetric like stress tensors are.- ___ None of the above.#### (h) What is the strain energy density for polycrystalline Cu (E = 130 GPa) under a normal stress of 11.4 MPa?Strain energy density is the energy stored in a material per unit volume due to deformation. Given the elastic modulus (E) of polycrystalline copper and the normal stress applied, choose the correct energy density:- ___ 100 J/m^3- ___ 500 J/m^3- ___ 1 kJ/m^3- ___ 1 MJ/m^3- ___ None of the above#### (i) Plastic flow stress isPlastic flow stress refers to the stress required to continue deforming a material plastically. The following statements describe how temperature and strain rate may affect plastic flow stress:- ___ generally increased by decreasing temperature and decreased by lower strain rate.- ___ generally decreased by decreasing temperature and decreased by lower strain rate.- ___ generally increased by decreasing temperature and increased by lower strain rate.- ___ generally decreased by decreasing temperature and increased by lower strain rate.- ___ None of the above ### Materials Science and Engineering Quiz#### Question (j): Plastic Deformation under Multiaxial StressesPlastic deformation under multiaxial stresses:- ___ is driven by the highest hydrostatic stress.#### Multiple Choice Sub-questions:___ is driven by the highest shear stresses unlike how it is driven under uniaxial stresses. ___ is driven by the maximum principal stress. ___ is driven by distortion energy just as it is under uniaxial conditions. ___ None of the above#### Question (k): The Rankine Criterion in GeneralThe Rankine Criterion in general:- ___ is more valid for very ductile materials.- ___ is more valid for metals.- ___ is more valid for visco-elastic materials.- ___ is more valid for brittle materials.- ___ None of the above#### Question (l): Screw DislocationA screw dislocation:- ___ has a residual hydrostatic stress field around its core.- ___ has a width in a TEM image equal to the Burgers vector when it is most visible.- ___ has a residual normal stress field around its core.- ___ has a length that is generally too short to extend across the entire thickness of a TEM sample.- ___ None of the above---*Note: In this quiz, there are no graphs or diagrams provided. For each question, carefully consider the properties and behaviors of materials under different stress conditions and apply your knowledge of material science principles.*

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(g) Strain _cannot be determined at a point because it requires a reference length. _is not dimensionless but is in units of %. _is always the response to a controlled stress, not the other way around. _tensors are not symmetric like stress tensors are. None of the above (h) What is the strain energy density for polycrystalline Cu (E = 130 GPa) under a normal stress of 11.4 MPa? _100 J/m^3 500 J/m^3 1 kJ/m^3 1 MJ/m^3 _None of the above

(g) Strain _cannot be determined at a point because it requires a reference length. _is not dimensionless but is in units of %. _is always the response to a controlled stress, not the other way around. _tensors are not symmetric like stress tensors are. None of the above (h) What is the strain energy density for polycrystalline Cu (E = 130 GPa) under a normal stress of 11.4 MPa? _100 J/m^3 500 J/m^3 1 kJ/m^3 1 MJ/m^3 _None of the above

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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