What two general competing processes control the creep rate of a metal? What is the relative strength (or rate) of the two processes during Stage I and Stage II creep behavior?

Q: In an engineering application, the material is a strip of iron with a fixed crystallographic…

A: Given: The yield strength of material for grain size of 30 microns, σ₁ = 110 MPa The yield strength…

Q: hod? 2- What is the effect of heat treatment on the average grain size? And what is the influence of…

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Q: What are intergranular fracture and transgranular fracture? When do they usually happen?

A: Intergranular fracture and transgranular fracture are types of fracture generally occurs in micro…

Q: What physical reasons why reducing grain size is an effective alternative for increasing the…

A: Smaller grains have greater ratios of surface area to volume, which means a greater ratio of grain…

Q: Describe the test methods that can be used to reflect the fatigue and creep resistance of materials…

A: Fatigue and creep are two important material properties that determine the longevity and reliability…

Q: Why should the theories of failure for brittle materials be used with caution?failure for brittle…

A: Theories of Failure: Theories of failure are those theories that predict the safe measurements of a…

Q: What is the stress-strain curves of materials?

A: The stress-strain curves shows the behaviour of material specimen when subjected to tension or…

Q: There is a disagreement about a spring steel failure and you, as an independent material scientist,…

A: Given: Case Disagreement about steel spring failure To identify  Failure origination.

Q: Describe the different methods for determining the allowable creep strengthfor a particular…

A: Creep is the tendency of the material to deform permanently under the influence of the persistent…

Q: Does consideration of creep become important when materials are in service for long periods of time?

A: Creep: When a part of any member  is subjected to constant stress at high temperature for a long…

Q: When does the mean stress level affect fatigue crack propagation rates in metal alloys?

A: A component is subjected to a fluctuating stress fails at a stress much below their static strength.…

Q: effect of the cooling rate on the microstructure and hardness of a material

A: Effect of cooling rate on Hardness The higher the cooling rate of the quenching, the smaller the…

Q: Discussion: • Dfleulties in testing brittle materials • Advantages of stress-strain diagram. •…

A: Plastic deformation is not substantial in brittle materials. They fail as a result of…

Q: What is the Distortion energy failure theory? Under what loading types and materials would you use…

A: The Distortion energy failure theory states that a material yields or fails when the total…

Q: Discuss the factors influencing the ductile-to-brittle transition in materials?

A: The ductile-to-brittle transition is a phenomenon that involves a change in fracture behavior of…

Q: A hot rolled AISI 1212 steel is given a cold work of 20 percent. Determine the new values ​​of the…

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Q: Are fatigue striations always visible on a fatigue fracture surface? If not, under what conditions…

A: Answer Fatigue Striation : these are the marks induced on the surface of fracture and goes on…

Q: Why do most materials exhibit fracture strengths much lower than their theoretical capacities to…

A: In theory, the calculations are done by assuming that the material is ideal i.e there is no defect…

Q: With respect to the S-N diagram shown below, answer the following questions: (a) for Gray cast iron,…

A: Part (a) Mark the value of 20,000 psi on the vertical axis. Move to the right and mark a point at…

Q: Is the presence of microvoid coalescence on a metal fracture surface inconsistent with macroscopic…

A: Microvoid Coalescence: It is a mechanism to show the failure method of a ductile material.

Q: Does the creep strength vary with temperature?

A: Creep: When a part of any member  is subjected to constant stress at high temperature for a long…

Q: In what class of material is stress whitening often seen, and what is the physical origin of the…

A: The phenomenon of stress whitening is generally observed in amorphous solids. However, it may also…

Q: Borosilicate glass bottles are processed into bottles using press and blow method shown in Figure…

A: Blow moulding is the process of inflating or blowing a thermoplastic molten tube termed a…

Q: A part made from hot-rolled AISI 1212 steel undergoes a certain amount of cold-work operation. If…

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Q: If the material is ductile and subjected to a static load , is it not necessary to use stress…

A: It is not necessary to use stress concentration factors for ductile material under static loading…

Q: Analyse effects of cold work and Annealing in term of change in microstructure and mechanical…

A: Cold Working:-  Cold working is a metal working process which can be done at below its…

Q: What visual evidence supports the presence of significant grain boundary sliding in many creep…

A: Irregular atomic bed displacement occurred due to grain boundary sliding. These displacements of…

Q: How would you know if there were different creep mechanisms acting at different temperatures?

A: Creep: When a part of any member  is subjected to constant stress at high temperature for a long…

Q: Question-7. Steady-state creep data taken for an alloy at a stress level of 160 MPa are given below.…

A: Given,  Data for stress level of 160 MPa The stress component , n =6.8 R = 8.3145 J/mol-K To find…

Q: Why is it not necessary to use stress concentration factors if the material is ductile?

A: Stress concentration is a location in a member under load where the magnitude of stress is…

Q: How does the stress/strain graph of a brittle material compare to a ductile material?

A: When a material is given to an external load, initially it experiences elastic deformation the…

Q: 11. Steady-state creep rate data are given below iron at 900 C. &($) 104 10-6 σ (MPa) 17 6.5 If it…

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Q: 1) Chapter 2: How do grain boundaries contribute to strain hardening in metals? 2) Chapter 3: Review…

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Q: Describe a metal fatigue failure.  (b) What two distinct types of surface areas are usually…

A: Crack initiation is the most common initial step of fatigue failure. When the applied stress…

Q: Discuss (i) fatigue failure of material  (ii) S-N Curve with a example of aluminium

A: ANSWER (1)

Q: Problem 2: A catastrophic failure occurred to a 7079-T6 aluminum alloy shaft. The maximum tensile…

A: Solution: Given Data: σmax,spec=0.3σy=0.3×300 MPa=90 MPaR=σminσmax=0a=2 cmc=1.3×10-4 cm   To Find:…

Q: A plate contains an internal flaw that extends through the plate thickness. The plate is to be…

A: (A) Write the given data. b=1 mc=100 mmLf=1.25 mma=9.34×10-2 mmY=1.03

Q: What would happen to the wire if it were stretched beyond its elastic limit? What would happen to…

A: Consider the diagram of stress vs strain for tension test for a typical tensile metal as shown…

Thermal Properties of Materials

In mechanical engineering, the thermal property is represented as the physical quantity that is relevant to the application of heat. The thermal properties are evaluated by variations in any specific material due to low heat or high heat. The quantities that influence the thermal property of the materials are mass, density, temperature, and many others.