As a fatigue crack grows from its initial length to its final length, does it spend most of its life in the shorter end or the longer end of the crack size range?

Q: Discuss the different sources of size effect. Describe energetic size effect in fracture using two…

A: The nominal strength (σN) of a structure is independent of the structure size (D) when geometrically…

Q: Task 2: As part of your job, your role is to investigate the behavior of a hydraulic system. This…

A: Given, The force required to make the sample rupture is Fr=4 kN=4000 N For Hydraulic fluid: The…

Q: What is R curveand the condition for crack  instability?

A: Explanation: R curve stands for crack-extension resistance curve or resistance curve. This curve…

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: (15) An alloy steel sheet with a central crack was subjected to a uniaxial stress 40,000 psi when…

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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: On examining a component which has failed by fatigue, the beach marks; O Radiate away from 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: n ductile materials occurs when the stresses at the crack tip ation factors for ductile materials…

A: a) factor of safety is always used while designing a components ( True)  b) small radius of…

Q: Which kind of fracture is associated with each crack propogration? (ductile or brittle) 1)…

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Q: Identify the crack propagation mode in a britte fracture failure in which the crack runs through the…

A: Brittle fractures usually have very little or no plastic deformation prior to failure. Materials…

Q: 1.) Assume that a wing component on an airplane is made of an aluminum alloy with a plane strain…

A: Disclaimer: Since you have asked multiple question, we will solve the first question for you. If you…

Q: Why the relative permeability curves are diagonal in naturally fractured reservoirs?

A: Ans: Due to high intrinsic fracture permeability.

Q: What is the magnitude of the maximum stress in MPa that exists at the tip of an internal crack…

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Q: A metal plate is to be exposed to cyclic tensile- compressive loading in which the maximum tensile…

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Q: (C) Indicate on your sketch the effect on the FAD if: () a residual stress were present in the…

A: for a pressurised vessel with an axial flow at depth is kr=JejP=LrP0Lr=PP0The process can be changed…

Q: 11. List the conditions that can induce brittle failure even in a ductile material.

A: Conditions that can induce brittle failure even in a ductile material- 1. High Strength Material are…

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: When does the Fatigue occur in the material?

A: When a material is subjected to repeated or cyclic loading then the failure in the material is…

Q: A fixation plate (thickness 3 mm, width 40 mm) has a circular hole of radius 5 mm. The plate…

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Q: . By referring to a sketch showing a stress concentration, describe the phenomenon of crack…

A: DISCLAIMER: Since you have asked multiple questions, we will solve the first question i.e. 7 for…

Q: 9) An aircraft component is made of an aluminum alloy that has a fracture toughness of 60MPavm. When…

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Q: Summarize the differences between intrinsic toughening processes and extrinsic toughening processes…

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Q: By what factor (e.g., 3X) has the remote stress been amplified at the crack tip/ Given Radius of…

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Q: For a steel with σYS=1200 MPa and E=210 GPa. 1. Please calculate the theoretical fracture strength…

A: Given that, Yeild stress, σys=1200 MPa,Young's Modulus of Elastisity, E=210 GPa, (1) Calculate the…

Q: Ductile and brittle fracture (what are they, how do they look under microscope)

A: Ductile fracture is a type of fracture characterised by a broad plastic deformation or "necking."…

Q: What is the difference in appearance between ductile & brittle fractures?

A: Fracture is a phenomenon in which body is separated into two or more pieces under the application of…

Q: What are the important points on the stress-strain diagram?

A: The stress-strain diagram for a material explains the relationship between the stress and strain of…

Q: During a fatigue test, the number of loading cycles to failure with increasing applied load.…

A: Given Fatigue test EMF series To find During fatigue test the number of loading cycle to failure…

Q: Under what circumstance could a fatigue crack become nonpropagating, even though the component…

A: Fatigue cracking is one of the primary damage mechanisms of structural components. Fatigue cracking…

Q: When the area of the crack propagation zone is larger than the area of the fast fracture zone, high…

A: Given :-  When the area of the crack propagation zone is larger than the area of the fast fracture…

Q: What is the magnitude of the maximum stress that exists at the tip of an internal crack having a…

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Q: A structural component is fabricated from a Ti-6AI-4W titanium alloy that has a plane-strain…

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Q: List 3 of the design methods that can be applied to avoid the occurrence of fatigue

A: Fatigue is the beginning and spread of fractures in a material as a result of cyclic stress,…

Q: For the case of a center notched panel that is loaded by concentrated forces acting at the crack…

A: Notched part in a component is the weakest part because at this part the inducement of stresses is…

Q: A. What is a suitable defect tolerance parameter and how can it be used to assess whether a…

A: solution; (A) when any component makes then engineer provide the tolerance on that component for…

Q: What types of conditions give rise to the formation of cracks at the stress concentration?

A: Stress concentration The region where the amount of stress suffered by the applied load is more than…

Q: (b) (i) Describe the stages of cracking in brittle materials with reference to applied stress.

A: Brittle material: The material which fail suddenly without any plastic deformation when stress is…

Q: When does fatigue occur in metals?

A: Many times force acting on the mechanical component varies in magnitude from a positive value to the…

Q: The overall fracture strength of glass may be increased by etching away a thin surface layer. It is…

A: The expression for the initial fracture stress is given by, σf1=2σ01a1ρt11/2 Here,  σ01 is the…

Q: Imagine that you have two cracked components that are identical to one another except that Component…

A: Fatigue is a very complex process and it depends upon 1)type and nature of loading 2) size of…

Q: Discuss the qualitative changes of burst and collapse resistances when the casing string is become…

A: The collapse and burst resistances of a pipe alter as it is subjected to axial stress (tension…

Q: An MgO component must not fail when a tensile stress of 13.5 MPa (1960 psi) is applied.  Determine…

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Q: Is the engineering stress-strain curve or the true stress-strain curve preferred for large strains?…

A: Engineering stress: It is the ratio of the applied force to the original cross-sectional area of a…

Q: 9-Brittle failure of polycrystalline material is always associated with the intergranular crack…

A: Brittle failure occurs when materials fails when material shows negligible elongation or plastic…

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.