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(

As per the company's guidelines when multiple choice questions are asked only first 3 questions have…

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 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 antial to explain why the metals exhibit much lower strength than that

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 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 antial to explain why the metals exhibit much lower strength than that

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

See similar textbooks

Similar questions

The theoretical failure strength is significantly higher than the empirical failure strength of polycrystalline materials, even when they are highly polished because: a) Polycrystalline materials have little or no capacity for plastic deformation, so they have lower failure stresses b) Plastic deformation in polycrystalline materials adsorbs energy which reduces their failure strength c)The energy needed to break the atomic bonds in crystal lattices is lower in polycrystalline materials as compared to in single crystals d)Polycrystalline materials contain internal discontinuities
Select All the correct statements from below. a. If the averaged distance between partial dislocations for material A observed under TEM is smaller than material B, the estimated stacking fault energy of material A is lower than material B. b. K_IC is a material property that doesn't change with testing conditions c. The main difference between high cycle fatigue and low cycle fatigue is the difference in the number of cycles to failure d. A negative R value in fatigue test indicate the minimum stress is compressive in nature
Consider a defect in a crystalline lattice as shown below. Which of the following statements is true? B 50 Select one: O a. The region around B experiences a higher strain on the upper side compared to the lower side O b. The region around B is unaffected by the impurity Oc. The region around B experiences mainly compressive strain Od. The region around B experiences mainly shear strain
7) Stress-strain plot for a metal is given below. Determine the following: a) Modulus of elasticity. b) Yield strength by 0.2% off-set method. c) Tensile and fracture strengths. d) Maximum load that can be sustained by a cylindrical specimen having an original diameter of 15.3 mm. e) If a specimen having an original length of 320 mm and elongation is measured as 2.56 mm, determine the applied stress. 450 400 350 300 250 200 150 100 50 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016 Strain Stress (MPa)
Two metal specimens, A and B, have ASTM grain size numbers of 3 and 8, respectively. Which specimen has the larger grain size? A)Grain size A > Grain size B B)Grain size A < Grain size B
Which is/are not reasons why brittle ceramics stress-strain behavior are not determined by the tensile test? Check the right answers a) It is difficult to grip brittle materials without fracturing them. b) It is difficult to prepare the specimens with the required geometry. c) Ceramics fail after only a small strain. d) Specimens must be perfectly aligned to avoid the presence of bending stresses. e) none of the above
The information from Young's Modulus A. Stress B. Strain C. Compression D. Stiffness What is 'strength' mean for metal in material selection's Strength- Density chart? A. Yield strength B. Compressive strength C. Tear strength D. Tensile strength Which specific objective and constrain is related to material's index M = E'/p ? A. Minimum weight and strength B. Strength and fatigue C. Minimum weight and stiffness D. Modulus and stiffness
For a steel specimen, fracture occurs at an engineering stress of 253 MPa. The specimen has a 77.1 % reduction in area. a) Determine the true stress at fracture. b) Determine the true strain at fracture.
Pick the best answer for the multiple choice question. Neoprene material is an example of which of the following families of materials?: Elastomers Ceramics Thermoset Polymers Hybrids Metals ( ) Corrosion failure of a metallic material can be prevented by which of the following methods: electroplating painting cathodic protection sacrificial anode all of the above ( ) The fracture strength of glass may be determined using: Tensile test Three-point bend test Creep test Impact test Fatigue test ( ) Ceramic materials have: High Hardness High Strength Low Toughness High Stiffness All of above ( )
4. A single crystal of aluminum is oriented for a tensile test such that its slip plan normal takes and angle of 28.1° with the tensile axis. There are three possible slip directions, which make angles of i) 62.4°, ii)72.0°, and iii)81.1° with the tensile axis Which of these three slip direction is most favored? If plastic deformation begins at an applied tensile stress of 1.95MPA, determine the critical resolved shear stress of aluminum.
Which of the following materials shows a dramatic change in fracture behavior with increasing temperature? Select one: A) Copper B) Mild steel C) Aluminum D) Stainless steel
19) Indicate the incorrect expression for plastic deformation of metallic materials: a) The level of the yield strength does not indicate if necking occurs after a small amount of homogeneous deformation or after a large amount (in other words, if the start of necking is delayed or not). b) Greater strain hardening exponent means an earlier 'necking'. c) If 'n' and 'm' parameters are greater the larger the homogeneous plastic deformation range. d) When plastic deformation progresses sufficiently, the negative contribution to the strain hardening of the metal due to local adiabatic heating starts the local plastic deformation.