Let's assume that the stress-strain elongation curve of ahigh-strength steel is given by this equation.o = 1.4*10º"ɛ32.9*10*ɛ ²+ 2.1*10°zCalculate the yield limit value of this steel.Oa (kgf/cm³)(For Yield Strength, use a straight line from the starting point and Calculatewwwwwwwww w mby moving the line parallel to the given curve)

given; stress(σ)=1.4*1010*ε3-2.9*108*ε2+2.1*106εwhere;σ=stress or yield strenthε=strain

Answered: Let's assume that the stress-strain…

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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Hall-Petch Constants Material Y; (MPa) k (MPa.ma) Copper 25 0.12 Titanium 80 0.40 Mild Steel 70 0.74 Using Hall-Petch equation, determine the Yield Stress (MPa) for a Mild Steel piece of metal having a grain size of 100 um. O 115 MPa O 101 MPa O 144 MPa O 130 MPa
Determine the tensile yield strength (0.2% offset) and the maximum strength of a metal alloy having the following tensile stress-strain diagram. Select one: The tensile yield strength Sy = 100 Mpa and the maximum strength Smax = 250 Mpa. The tensile yield strength Sy = 170 Mpa and the maximum strength Smax = 250 Mpa. The tensile yield strength Sy = 150 Mpa and the maximum strength Smax = 200 Mpa. The tensile yield strength Sy = 240 Mpa and the maximum strength Smax = 250 Mpa. The tensile yield strength Sy = 80 Mpa and the maximum strength Smax = 250 Mpa.
The figure below shows the tensile engineering stress-strain behavior for a steel alloy. (a) What is the modulus of elasticity? (b) What is the yield strength at a strain offset of 0.002? (c) What is the tensile strength? Stress (MPa) 600 500 400 300 200 100 T I 0.00 Stress (MPa) 0.04 500 400 300 200 100 0.000 0.08 0.002 Strain 0.004 Strain 0.12 I 0.006 0.16 0.20 In the previous problem, A load of 85,000 N (19,100 lbf) is applied to a cylindrical specimen of the steel alloy that has a cross-sectional diameter of 15 mm (0.59 in.). (a) Will the specimen experience elastic and/or plastic deformation? Why? (b) If the original specimen length is 250 mm (10 in.), how much will it increase in length when this load is applied?
2) Use the engineering stress strain diagram provided below to answer parts (A) to (H) below (the stress-strain diagram has already been drawn for you): stress strain diagram 400 350 0 300 0 250 0 200 0 150.0 100.0 50.0 00 0 05 01 0. 15 strain A. Determine the tensile strength of this alloy. B. show the clastic, plastic and total strain on the diagram stress (Mpa)
Quèstion 3 4 p From the following figure shows the tensile stress- strain curve for a plain-carbon steel. What is its modulus of elasticity? 600 MPa 600r 10 psi 50 60 400 400 40 20 100 0.05 0.10 0.15 Stain O A. 320 GPa O B. 500 GPa OC.400 GPa O D.215 GPa Sem (MP
O The following engineering stress-strain data were obtained for a 0.2% C plain-carbon steel. (i) Plot the engineering stress-strain curve. (ii) Determine the ultimate tensile strength of the alloy. (iii) Determine the percent elongation at fracture. Engineering Engineering Engineering Engineering Stress Strain Stress Strain (ksi) (in./in.) (ksi) (in./in.) 76 0.08 30 0.001 75 0.10 55 0.002 73 0.12 60 0.005 69 0.14 68 0.010 65 0.16 72 0.020 56 0.18 74 0.040 51 0.19 75 0.060 (Fracture)
Determine the tensile yield strength (0.2% offset) and the maximum strength of a metal alloy having the following tensile stress-strain diagram. Tensile stress-strain diagram 150 100 0.05 02 05 035 Strain 300 250 200 150 100 50 W Stress (Mpa)
Q4 Answer with True or Fales and re-write the sentence with correction for 10 only ( 1- Mn Ni Cr, W, Mo, V are the most important elements that forming Austenite. 2- Diamond Pyramid is used for the Scale C in Rockwell hardness test. 3- The stress of forming process must exceed UTS yield point. 4- The brittle transition temperature of steel is within -4 °C to 4°C. 5- Quenching process for steel is used to increase the ductility. 6- The annual quantity production of high production process is more than ten thousand. 7- Knoop test method is used to test the thick and hard material with little load.
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.
Q4 Answer with True or Fales and re-write the sentence with correction for 10 only 1- Mn Ni Cr, W, Mo, V are the most important elements that forming Austenite. 2- Diamond Pyramid is used for the Scale C in Rockwell hardness test. 3- The stress of forming process must exceed UTS yield point. 4- The brittle transition temperature of steel is within -4 °C to 4°C. 5- Quenching process for steel is used to increase the ductility. 6- The annual quantity production of high production process is more than ten thousand. 7- Knoop test method is used to test the thick and hard material with little load. 8- The purpose of the addition of S to steel with 0.5% is to improve the machinability of steel. 9- The series 4 of Aluminum alloy refer to the presence of Cu as main alloying element. 10- Construction steel with 0.2-0.3% C has higher strength and higher ductility. 11- Austenitic Stainless Steel: contain 16-26 % Cr.
Q.3. A cylindrical specimen of cold-worked Brass has a tensile strength of 500 MPa. If the specimen remained cylindrical during deformation and its original radius was 10.6 mm, determine its radius after deformation. The dependence of tensile strength on percent cold work is shown in the following Figure. 140 900 1040 Steel 120 800 700 100 600 Brass -80 500 -60 400 Copper 300 -40 200 10 20 30 40 50 60 70 Percent cold work Tensile strength (MPa)
The yield stresses (oy) have been measured using steel and aluminum specimens of various grain sizes, as follows: Q.1 Material D (um) σν (MPa) Steel 60.5 160 136 128 Aluminum 11.1 235 100 223 (a) Determine the coefficients oo and ky in the Hall- Petch for these two materials. (b) Determine the yield stress in each material for a grain size of d326 um.

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