Q1: Choose the correct answer for the following questions: 1_ Failure due to excessive deformation is controlled by(a) Material properties (b) Design & Dimensions (c) Both (d) None 2 Failure due to excessive deformation is controlled by (a) Yield strength (b) Tensile strength (c) Young's modulus (d) All 3_time dependent yield is known as. (a) Fracture (b) Fatigue (c) Buckling (d) Creep 4. Brittle fracture is more dangerous than ductile fracture because (a) No warning sign (b) Crack propagates at very high speeds (c) No need for extra stress during crack propagation 5_fracture voids usually form at (a) Inclusions (b) Second phase particles (c) Grain boundary triple points (d) All 6_fracture stress (a) is proportional to (a) crack length (b) 1/crack length (c) (crack length)(crack length) 7_racture toughness is measured in terms of (a) Strain energy release rate (b) Stress concentration factor (c) Both (d) None 8_In fracture mode-11, fracture surfaces...

Q1: Choose the correct answer for the following questions: 1_ Failure due to excessive deformation is controlled by(a) Material properties (b) Design & Dimensions (c) Both (d) None 2 Failure due to excessive deformation is controlled by (a) Yield strength (b) Tensile strength (c) Young's modulus (d) All 3_time dependent yield is known as. (a) Fracture (b) Fatigue (c) Buckling (d) Creep 4. Brittle fracture is more dangerous than ductile fracture because (a) No warning sign (b) Crack propagates at very high speeds (c) No need for extra stress during crack propagation 5_fracture voids usually form at (a) Inclusions (b) Second phase particles (c) Grain boundary triple points (d) All 6_fracture stress (a) is proportional to (a) crack length (b) 1/crack length (c) (crack length)(crack length) 7_racture toughness is measured in terms of (a) Strain energy release rate (b) Stress concentration factor (c) Both (d) None 8_In fracture mode-11, fracture surfaces...

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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Desuon T EHide blocks Determine the Young's modulus of a metal alloy having the following tensile stress-strain diagram. ot yet nswered Stress-Strain Diagram Marked out of 5.00 1200 P Flag question 1000 800 1000 500 800 600 400 400 200 0.005 0.01 0.015 002 0.025 0.03 0.05 0.1 0.15 Strain (mm/mm) 0.2 0.25 Select one: O E = 1000 Mpa O E= 250 Gpa OE = 120 Gpa E = 50 Gpa E = 200 Gpa Stress (Mpa)
As the tempering temperature of a heat-treated steel increases, the associated values of Brinell hardness also increases, while the values of tensile strength and yield strength decrease. True False The correct definition of Dimensional Analysis is: A procedure to find the yield point of a material when no definitive yield point can be determined graphically. A procedure to calculate the Elastic Modulus. A procedure to verify the size of a mass of material. A methodical process of converting from one set of units to another set of units.
During a tensile test of Aluminum alloy whose initial diameter was 0.505-in and gage length was 2.0-in, the following data was recorded. Load Elongation (in.) Load Elongation (in.) 0.020 (1b) |(Ib) 14 000 2 310 0.00220 14 400 0.025 4 640 0.00440 14 500 0.060 6 950 0.00660 14 600 0.080 9 290 0.00880 14 800 0.100 11 600 0.0110 14 600 0.120 12 600 0.0150 13 600 Fracture a) Determine Stress and strain b) Draw the stress strain diagram c) Determine the following mechanical properties 1) Proportional limit, 2) Modulus of elasticity 3) Yield point 4) Ultimate strength 5) Rupture strength.
For the stress-strain curves below, which statements are correct? Stress (MPa) 60 50 40 30 20 10 0 a. 0 b. O c. e. f. A 1 2 The mechanical behavior shown in C is that of an elastomer with low elastic modulus Polymer B and C have an elastic behavior whereas A has a plastic behavior While the deformation in polymer A is fully reversible until breakage, polymer B and C only display reversible deformation until 0.1X and 5x elongations respectively Od. The polymer with brittle nature is the one that possesses the highest elastic modulus The mechanical behavior shown in B is that of an elastomer with low elasticity The polymer with the necking behavior has the highest strength B с 3 4 5 6 7 8 Strain
You have been given the following set of data from a soil-geotextile friction test: Normal stress (kPa) Peak shear strength (kPa) Residual shear strength (kPa) 17 20.2 13 35 31 22 70 52 39.5 140 94 74.5 (a) Plot the Mohr-Coulomb failure envelope (x-axis=normal stress; y-axis=shear stress) (b) Determine the peak friction angle, and the residual friction angle, . (c) Determine the peak adhesion and the residual adhesion. (d) Calculate the fabric efficiency based on a soil friction angle of = 35-degrees using the peak friction angle. **HINT: the equation for efficiency of soil friction angle mobilization is:
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The stress-strain diagram of a reinforcement steel having a cross-sectional diameter of 12 mm diameter and 100 mm gage length is determined after its tensile strength test as follows. Based on the stress- strain diagram determine the followings properties of the material (Poisson's ratio of the material is 0.32) : 600 550 500 450 400 350 d) Resilience 300 e) Shear modulus 250 200 f) Bulk modulus 150 g) Ductility as described by 100 percent change in length 50 0.01 0.02 O.03 0.04 0.05 0.06 0.07 0.08 0.09 0.i 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 Strain Stress, MPa
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Calculate the (total tensile strength) of the mitotic tensile strength test for the information in the table below: Time # D mm Load Kn sec 1 60 16 14 2 54 15.5 14 3 57 16 15.5 4 52 15 18 5 53 15 14 59 17.5 19 50 9 17 56 19 21 58 10 21.4 55 11 25 67899 10
A long steel rod is placed horizontally between two supports, one at each end. The rod bends a little in the center. Which property of this rod can be used to estimate how much the rod should bend at the center? 1. Its Shear Modulus 2. Its Young's Modulus 3. All of these Moduli can be used to compute how much it bends. 4. Its Bulk Modulus.
The shear modulus. G. of a material can be determined by applying a torque. T, on a cylindrical material specimen and measuring the angular twist, 0. The modulus can then be calculated from: G each measured variable (L. T.t. 0, R) is 3.4%. 3LT 2 Ree where R and Lare the specimen radius and length, respectively. The relative uncertainty in What is the total relative uncertainty in G? (Provide your amwer as a percentage using two decimal places. Do not include the % symbol.) 1226