Podcast
Questions and Answers
What is the main purpose of a creep test?
What is the main purpose of a creep test?
- To apply a constant tensile stress to a specimen at a constant temperature and measure strain over time (correct)
- To apply a constant tensile stress to a specimen at varying temperatures
- To measure the rupture lifetime of the material at varying stress levels and temperatures
- To measure strain as a function of time at varying stress levels and temperatures
What is one of the mechanisms of creep mentioned in the text?
What is one of the mechanisms of creep mentioned in the text?
- Thermal activation of dislocations due to melting temperatures
- Increasing pressure causing strain on the material
- Vacancies migrating within the material (correct)
- Plastic deformation of the material at high temperatures
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?
- To reduce the susceptibility to creep deformation at high temperatures (correct)
- To ensure the blades remain ductile under high pressure steam
- To prevent the formation of voids and material defects
- To increase the strain rate of the material
What is a characteristic of ceramics that provides resistance to deformation by creep?
What is a characteristic of ceramics that provides resistance to deformation by creep?
What is an example application where components experience creep phenomenon?
What is an example application where components experience creep phenomenon?
What type of stress do power plant pipes and turbine engine blades experience?
What type of stress do power plant pipes and turbine engine blades experience?
Why is it important to know the operating conditions of the system when selecting materials for an application?
Why is it important to know the operating conditions of the system when selecting materials for an application?
Which temperature range can polymers or tin-lead solder be susceptible to creep?
Which temperature range can polymers or tin-lead solder be susceptible to creep?
What factor determines the rupture lifetime in a creep test?
What factor determines the rupture lifetime in a creep test?
What is being measured in a typical creep test?
What is being measured in a typical creep test?
What is creep in the context of materials science?
What is creep in the context of materials science?
At what temperature does creep become significant for a material?
At what temperature does creep become significant for a material?
What is one possible consequence of creep failure?
What is one possible consequence of creep failure?
How does creep occur in the context of creep mechanisms?
How does creep occur in the context of creep mechanisms?
What renders a material useless in performing its intended function in the context of creep failure?
What renders a material useless in performing its intended function in the context of creep failure?
When does creep failure occur?
When does creep failure occur?
