1. What is the approximate ductility (%EL) of a cold worked brass that has a yield strength of 345 MPa (50,000 psi)1401201040 Steel1040 Steel120700600100500BrassBrass eoS400Brass300Copper40200Copper040 e0040Copper100O 10 20 30 40 50 60 70Percent cold work2000 10 20 30 40 50 60 70Percent cold workO 10 20 30 40 D0 60 70Percent cold work(a)(b)

Concept: From first graph-a, For brass(yellow graph) , at a yeild strength of 345 Mpa , the…

Answered: 1. What is the approximate ductility…

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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An aircraft component is fabricated from an aluminum alloy that has a plane strain fracture toughness of 31 MPa/m. It has been determined that fracture results at a stress of 227 MPa when the maximum (or critical) internal crack length is 2.47 mm. a) Determine the value of Yo√a for this same component and alloy at a stress level of 340 MPa when the maximum internal crack length is 1.24 mm. i MPa √//m b) Under these circumstances will the component fail? No Yes Unable to Determine 3
Q1. (i) Initial strain Please enter your supplied question data Q1. (ii) Eo B (hr¹Pa-¹) n IVICUITO Fracture 0.003 Please enter your answers here Your Q1. (i) Answers: 4.60E-34 Q1. (ii) 3.2 Q2. o (Pa) σo (Pa) 780,000,000 Q3. t (hr) Q2. A component is made from a metal that is known to be viscoelastic and behaves according to a secondary creep rate equation with constants of B and n provided as your input values. If the component is subjected to a constant force that results in the initial strain of E provided to you, determine the design stress for a secondary creep life of 1,000 hrs before attaining a limiting strain, &, of 0.01. Q3. If the same component is subjected to a constant displacement that results in the value of initial stress, o, provided to you, calculate the time for the stress to reduce to 200MPa. Young's modulus of the bolt is E = 200GPa.
Question 5: Following is tabulated data that were gathered from a series of Charpy impact tests on a tempered 4140 steel alloy. Temperature (°C) 100 75 50 25 0 -25 -50 -65 -75 -85 -100 -125 -150 -175 Impact Energy (J) 89.3 88.6 87.6 85.4 82.9 78.9 73.1 66.0 59.3 47.9 34.3 29.3 27.1 25.0 (a) Plot the data as impact energy versus temperature. (you can use Excel or other software). (b) Determine a ductile-to-brittle transition temperature as that temperature corresponding to the average of the maximum and minimum impact energies. (c) Determine a ductile-to-brittle transition temperature as that temperature at which the impact energy is 70 J.
1. Suppose that you have measured the strain aging kinetics of a high-strength low-alloy (HSLA) steel and obtained the following results: Aging Temperature (°C) Aging Time (min) ΔΥ (MPa) 150 240 40 130 1800 40 Determine (using a mathematical rather than graphical approach) the time necessary to obtain a strengthening increment, AY, of 40 MPa at an ageing temperature of 120°C. State any assumptions made in order to arrive at your approximation.
Q1/A structural part is 1-meter-long and subjected to a 50 KN load in which this part must be deformed elastically without experiencing any permanent deformation. If you know that part is made of steel, brass, aluminum, and Titanium alloys and the yield strengths and densities of these alloys are: 860 MPa, 7.9 g/cm³; 415 MPa, 8.5g/cm³; 310 MPa, 2.7 g/cm³; and 550 MPa, 4.5 g/cm³ respectively. Based on these criteria, rank the alloys from the heaviest to the lightest in weight.
Calculate the ductility of this steel alloy in %EL.
Question 1 The S-N diagram for a titanium alloy is shown in the figure. Calculate the fraction of life consumed by the following sequence of loadings: 15,000 cycles at 80 MPa 120,000 cycles at 60 MPa 3,500,000 cycles at 50 MPa Maximum stress (ksi) 160 140 120 100 80 60 40 20 I 10³ 104 105 Cycles to failure 100 107
One.
3. A cylindrical specimen of cold-worked copper has a ductility, %EL. If its cold-worked radius is d, what was its radius before deformation? Use %EL=25%; d = 10mm Ductility (%EL) 70 60 50 40 30 20 Brass 1040 Steel 10 Copper 0 0 10 110 20 30 40 50 60 70 Percent cold work

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