Podcast
Questions and Answers
What is creep in materials?
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 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?
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?
What renders a material useless in performing its intended function in creep failure?
What can result from sufficient strain or creep in materials?
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?
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?
What is the main mechanism of creep deformation mentioned in the text?
Which components are cited in the text as examples experiencing creep phenomenon?
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?
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?
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?
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 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?
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?
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 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?
What is an example of an application where components experience centrifugal stresses and high pressure steam lines?
