Answered: Describe three (3) main differences…

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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The yield strength for an alloy that has an average grain diameter of 5.9 x 10-2 mm is 148 MPa. At a grain diameter of 7.8 × 10-³ mm, the yield strength increases to 233 MPa. At what grain diameter, in mm, will the yield strength be 247 MPa? d = i mm
A cylindrical specimen having a cross-section of radius, r, is subjected to a uniaxial tensile force, F, as shown in the accompanying figure. Establish a criterion for the selection of light and stiff materials for this bar (Hints: You need to develop an expression for the mass of material required in terms of tension, bar length, density, and stiffness of the material). M
need correct and explained properly
Differentiate between ductile and brittle fracture in materials. Discuss the importance of ductile to brittle transition in BCC and HCP metals.
please answer quickly
The yield strength for an alloy that has an average grain diameter of 4.6 x 10-2 mm is 105 MPa. At a grain diameter of 7.7 × 103 mm, the yield strength increases to 248 MPa. At what grain diameter, in mm, will the yield strength be 234 MPa? d = i mm
Consider a single crystal of some hypothetical metal that has the BCC crystal structure and is oriented such that a tensile stress is applied along a [2 2 1] direction. If slip occurs on a (2 1 1) plane and in a [-1 1 1] direction, compute the stress at which the crystal yields if its critical resolved shear stress is 2.4 MPa.
(3) Metals tend to expand when heated and contract when cooled. If a clock has a pendulum made of a bob attached to the end of a metal rod (as opposed to the string we used in our lab), completely describe the effect that temperature would have on the accuracy of the clock (i.e., would the clock run too fast or too slow) and why? k
A steel with a grain size of 25 μm has a yield stress of 200 MPa and with a grain size of 9 μm a yield stress of 300 MPa. A dispersion of non-deformable particles is required to raise the strength to 500 MPa in a steel with grain size 100 μm. What would be the required dispersion spacing? (Assume the shear modulus G = 80 GPa, the Burgers vector b = 0.2nm.)Hint : Use the Hall_petch relation given below :σy = σi + kd-½where σy is the yield strength, σi is the lattice friction stress, k is constant and d is the average grain size.
Explain (2) methods that can be used differentiate between ductile and brittle metallic materials
Briefly explain/define the following topics. Use drawings and equations if necessary. Galvanic corrosion and its prevention (а) (b) (d) Adhesive and abrasive wear Factors that affect the endurance limit in materials (c) Thermal residual stresses and their origin (e) List the mechanisms for creep deformation in metallic materials. Explain one of them.

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Describe three (3) main differences between the Modulus of toughness and the Modulus of risilience for metallic materials. Use suitable example in your explanation.