A non-cold-worked cylindrical rod with an initial length of 800 mm and diameter of 15 mm is to be deformed using a tensile load of 45 kN. Of the materials listed below, which are possible candidates if you assume that failure of the system occurs when the rod plastically deforms? Do the possible candidates change if you change your assumption to the system failing at the onset of necking in the rod? Justify your choice(s). Material Young's Modulus (GPa) 1040 Steel Yield Strength (MPa) UTS (MPa) Elongation (%) 205 440 680 25 Brass 100 185 310 68 Соpper 125 160 220 44

A non-cold-worked cylindrical rod with an initial length of 800 mm and diameter of 15 mm is to be deformed using a tensile load of 45 kN. Of the materials listed below, which are possible candidates if you assume that failure of the system occurs when the rod plastically deforms? Do the possible candidates change if you change your assumption to the system failing at the onset of necking in the rod? Justify your choice(s). Material Young's Modulus (GPa) 1040 Steel Yield Strength (MPa) UTS (MPa) Elongation (%) 205 440 680 25 Brass 100 185 310 68 Соpper 125 160 220 44

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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1. An aluminium rod of circular cross section is to withstand 250kN of tensile load for a structural application. The minimum length of the rod is 4.2m but must deform elastically to no more than 7mm when the tensile force is applied. Take that the engineering yield stress limit and the Young’s modulus of the material are 260 MPa and 70 GPa respectively.If a safety factor of 2 is adequate, design an appropriate rod and state why factor of safety is important in your analysis. 2. Explain the differences in the grain structure between a metal which has been cold worked and another same cold worked piece but has been fully re-crystallised. Why are small angle grain boundaries not as effective in interfering with the motion of dislocation as high angle grain boundaries?
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