causes materials to fail in fatigue at a stress less than the ultimate stress? How does this relate to the microstructure of the material?

Q: Under what conditions may a ductile material undergo a brittle fracture?

A: In some cases ductile materials will fail in brittle the causes for this behavious includes 1)…

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: 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: 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: How is the torsion test performed to determine the material’s ultimate shear stress?

A: A torsion test is a destructive type of testing used to find the properties of specimen under stress…

Q: A piston, 9 cm in diameter, is used to increase the internal pressure in a cylinder from 0 to 50…

A: The diameter of the piston is .The yield strength of the cylinder is .The fracture toughness of the…

Q: An aircraft component, made of 7075-T6 aluminum alloy, can be represented as a bar of diameter 20 mm…

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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: As a materials engineer in a metal-processing company, you are given a section of metal to heat…

A: A section of metal which is heat treated after cold worked.To find- properties of metal after heat…

Q: Can the maximum normal stress theory or Mohr’s failure criterion be used in practice to predict the…

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Q: Does the failure of materials occur due to creep and fatigue?

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

Q: The fracture of a brittle material is caused only by the maximum tensile stress in the material, and…

A: The brittle material may fail under compressive stress or may fail tensile stress. When the induced…

Q: Why is the prediction of the tensile fracture of a brittle material is difficult to predict?

A: Brittle materials are those materials that break without any significant plastic deformation and…

Q: The R-ratio (minimum stress to

A: Given data; Determine the R ratio for this cyclic loading.During a high cycle fatigue test, a…

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: Why do we define engineering and true stresses for tension/compression loading but not for shear…

A: Engineering stress: It is the stress based on the initial or original cross sectional area (Ao)…

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: Failure of Materials Due to Creep and Fatigue.

A: Environmental conditions, such as corrosion, have an impact on fatigue strength. The fatigue…

Q: How does fatigue crack growth rate vary with applied stress level?

A: The fatigue crack growth rate is dependent on the stress intensity factor. The stress intensity…

Q: Does the normal strain depend only on the assumptions made with regardto the deformation?

A: Normal strain or nominal strain is defined as the strain which is given by the ratio of the…