16 Questions
What type of deformation is characterized by the material's inability to return to its original dimension?
Plastic deformation
Which mechanical property represents resistance to the separation of atoms?
Elastic modulus
In stress-strain testing, what does the nonlinear portion of the curve represent?
Plastic response
What does the initial linear slope of the stress-strain plot represent?
Elastic modulus
What is the main characteristic of elastic deformation?
Reversible
What is the primary mechanism of plastic deformation in metals?
Dislocation motion
How does grain size affect the yield strength of a metal?
Decreasing grain size increases yield strength
What is the primary difference between the stress-strain behavior of a rubber band and a metal?
Rubber bands exhibit nonlinear elastic behavior, while metals exhibit linear plastic behavior
What is the difference between engineering stress and true stress?
Engineering stress is calculated using the original cross-sectional area, while true stress is calculated using the instantaneous cross-sectional area
What is the purpose of the 0.2% offset yield strength in a stress-strain curve?
To determine the point at which the material begins to deform plastically
How does the yield strength of ceramics compare to that of metals?
The yield strength of ceramics is higher than that of metals
What happens during plastic deformation of a material?
The material is deformed irreversibly.
Which mechanical property is related to the ability of a material to undergo plastic deformation without fracturing?
Ductility
What is the purpose of using true stress ($\sigma_T$) and true strain ($\epsilon_T$) instead of engineering stress and strain?
To account for the changing cross-sectional area and length during deformation.
What is the effect of decreasing the grain size on the strength of a polycrystalline material?
The strength increases due to more grain boundaries acting as barriers to dislocation motion.
Which of the following statements about rubber band testing is correct?
Rubber bands can be used to demonstrate the concept of elastic limit.
Learn about stress yield, elastic fracture in typical metals, very ductile and less stiff materials like polymers, and elastic deformation. Explore concepts such as elastic modulus and the relationship between stress and strain.
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