Mechanical Engineering: Creep Failure and Design Against Creep

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What is creep in materials?

Time-dependent deformation under constant stress (correct)

Permanent dimensional change without any stress

Temperature-dependent deformation under varying stress

Non-permanent dimensional change under constant stress

When does creep become significant for a material?

When the temperature is less than 0.4 Tm

When the stress is greater than the yield stress

When the temperature is greater than 0.4 Tm (correct)

When the stress is less than the yield stress

What type of process leads to creep in materials?

Diffusion-controlled process (correct)

Mechanical deformation process

Pressure-driven process

Heat-induced process

What renders a material useless in performing its intended function in creep failure?

Dimensional change Signup and view all the answers

What can result from sufficient strain or creep in materials?

Stress rupture or creep fracture Signup and view all the answers

In what direction do atoms move in response to the applied stress and temperature during creep?

To fill the voids in the grains, resulting in elongation of the grain Signup and view all the answers

What is the main mechanism of creep deformation mentioned in the text?

Vacancy migration along grain boundaries Signup and view all the answers

Which components are cited in the text as examples experiencing creep phenomenon?

Boilers, gas turbine engines, and ovens Signup and view all the answers

Why are materials with high melting temperatures often selected for turbine engine blades?

To withstand sustained stress over time at a relatively high temperature Signup and view all the answers

What is the purpose of a creep test mentioned in the text?

To measure strain over a period of time at a constant stress and temperature Signup and view all the answers

Why are nickel-based superalloys mentioned as susceptible to creep at relatively high temperatures?

Due to their susceptibility to creep at relatively high temperatures Signup and view all the answers

What can be inferred about ceramics based on the information provided in the text?

Ceramics have very high resistance to deformation by creep Signup and view all the answers

What does the slope of the strain vs. time curve in a creep test represent?

Strain rate of the material during the test Signup and view all the answers

Why is it important to know the operating conditions of a system when selecting materials for an application to prevent failure due to creep deformation?

To understand at what temperature materials experience thermally activated creep Signup and view all the answers

What is the purpose of materials experiencing a creep test?

To assess their behavior under constant tensile stress and temperature Signup and view all the answers

What is an example of an application where components experience centrifugal stresses and high pressure steam lines?

Turbine engine blades Signup and view all the answers

Mechanical Engineering: Creep Failure and Design Against Creep

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Questions and Answers

What is creep in materials?

When does creep become significant for a material?

What type of process leads to creep in materials?

What renders a material useless in performing its intended function in creep failure?

What can result from sufficient strain or creep in materials?

In what direction do atoms move in response to the applied stress and temperature during creep?

What is the main mechanism of creep deformation mentioned in the text?

Which components are cited in the text as examples experiencing creep phenomenon?

Why are materials with high melting temperatures often selected for turbine engine blades?

What is the purpose of a creep test mentioned in the text?

Why are nickel-based superalloys mentioned as susceptible to creep at relatively high temperatures?

What can be inferred about ceramics based on the information provided in the text?

What does the slope of the strain vs. time curve in a creep test represent?

Why is it important to know the operating conditions of a system when selecting materials for an application to prevent failure due to creep deformation?

What is the purpose of materials experiencing a creep test?

What is an example of an application where components experience centrifugal stresses and high pressure steam lines?

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