Complete( any five) of the following: 1- In fatique, the load ratio equals to 2-The relationship beteeen residual stress and number of cycles required to fatique failure is 3- Gc for Cu is ..than Ge of glass

Complete( any five) of the following: 1- In fatique, the load ratio equals to 2-The relationship beteeen residual stress and number of cycles required to fatique failure is 3- Gc for Cu is ..than Ge of glass

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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Question-7. Steady-state creep data taken for an alloy at a stress level of 160 MPa are given below. The stress exponent n for the alloy is 6.8. R is 8.3145 J/mol-K. Compute the steady-state creep rate at 1000 °C and a stress level of 68 MPa. Es (h-1) 6.8 × 10-5 T (°C) 800 8.6 x 10-3 900
Using the tensile test simulation tool, a. generate the stress-strain curve for aluminum b. Indicate the following points in the stress-strain curve for aluminum and give the corresponding values: limit of proportionality elastic limit 0.2% offset yield stress (include the graph illustrating how this was determined) ultimate stress fracture stress c. Calculate modulus of elasticity. d. compare aluminum with nylon (include the related graph) and answer the following: Which has higher tensile strength? Provide the necessary values to support the answer. Which is stiffer? Support your answer with calculations.
(a)Describe, with a labelled diagram, how you would measure accurately theextension of such a wire under an applied load. (b) The graph below shows how the extension of a wire varies with the loadapplied to it. The wire used has a length of 3m and a diameter of 5 x 10^-4m i. Calculate the tensile stress produced by a load of 50N.ii. Find the energy stored in the wire when the load is acting.iii. Calculate the reduction in gravitational PE of a 5kg mass used to providethe load.iv. Calculate Young's modulus for the metal of the wire.
Define Modulus of Rigidity: Word description: Sketch (example) : Equations: Units:
1) Draw (using a normal graph paper) a conventional stress-strain diagram for ANY metallic material (e.g. steel, aluminium, copper, brass, iron, tungsten). The diagram should be as accurate as possible using a suitable scale (e.g. 1cm: 10 N). 2) Calculate the Modulus of Elasticity, Modulus of Toughness and Modulus of Resilience for the material from the stress-strain diagram. Show your calculations in detail on a separate A4 piece of paper.
2. Another cylindrical component is madeof Enfennering ceramic Al203 but with different dimensions. Here, l=30 cm and the diameter is 4 cm. Assume the same Weibull modulus of 9. Calculate the level of the tensile strength for the following probability of failures: a. Pr (V) = 0.1 b. Pr (Vo) = 0.01 c. What is the survival probability and the failure probability of this component if a stress of 200 MPa is applied?
information: "When performing a tensile test of a metal, these values were found for stress and strain. the yield strength (YS) is stress at 0.2% plastic strain" The task: A 5 meter long rod of this material is loaded axially with a stress of 244 MPa.i. How long is the rod under load?ii. Then the bar is relieved, how long is it now?
Q3: Two material were tested in tension, the first is aluminum alloy has stress-strain curve define by 300 MPa was fracture after 35% reduction in area. The other a copper alloy has stress-strain curve define by=100+120 MPa was fracture after 98% elongation. Which alloy have more toughness? Support your answer with the sketch.?
(a) Borosilicate glass bottles are processed into bottles using press and blow method shown Temperature ("F) in Figure 6(a). By referring to Figure 6(b), 400 800 1200 1600 2000 2400 2800 3200 1018 1016 Borosilicate i. State the suitable temperature range for making glass bottles and justify the glass 96% silica Fused 1016 glass silica 1014 Strain point answer. 1014 1012 Annealing point 1012 1010 H1010 ii. Discuss the process to relieve thermal stresses the glass bottles using Figure 6(b). 10 Softening point 10 106 Working range 105 10 i1i. Briefly discuss the consequence if the process in (ii) is not performed on the glass Working point 10 10 bottles. Melting point 102 Soda-lime glass 200 400 600 800 1000 1200 1400 1600 1800 Temperature ("C) iv. State THREE (3) reasons why glass would be the best material for the glass (a) (b) bottles? Figure 6. (a) Press and blow method and (b) temperature dependence of viscosity for various types of glasses Viscosity (Pa-s) Viscosity (P)
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Steady-state creep rate data are given in the following table for a nickel alloy at 538 °C (811 K): o(MPa) 10-7 22.0 10 36.1 Compute the stress at which the steady-state creep is 104h' (also at 538 °C).
QI/ If the thermal shock resistance of RBSN is 2214 w/m, poission ratio= 0.2 , cofficient of expansion= 2.6 x 10 /k, thermal conductivity=9 w/ m.k, specific heat= 0.86 j/ g.k ,thermal diffusivity= 4.4 x10 m /s, modulus of elasticity = 200 Gpa Calculate : 1.fracture streangth in Mpa 2. the density in Mpa 3. the thermal shock resistance in m' k/ s