Vocabulary Terms
You should be able to define the following terms.
Anisotropy | creep | elastic limit | plastic deformation |
semi-brittle | stress-strain diagram | Young's Modulus | axial compression |
differential stress | elastic modulus | Poisson's Ratio | stiffness |
triaxial experiment | axial load | ductile | Hooke's Law |
pore fluid pressure | strain hardening | ultimate strength | brittle failure |
effective stress | hysteresis loop | rheology | strain rate |
viscosity | competent | elastic behavior | incompetent |
rupture strength | strain sofetning | yield strength |
Concepts
You should be able to give short answers to the following questions:
1.) On a stress-strain diagram be able to determine the following for a sample: A) Yield Strength or "elastic limit"; B) Ultimate Strength; C) Rupture Strength; D) if the sample is "Brittle", "Semi-Brittle", or "Ductile", E) calculate the Young's Modulus "E".
2.) On a stress-strain diagram be
able to recognize: A) elastic behavior, B) plastic behavior, C) the effects
of "work hardening", D) the effects of "strain sofetning",
E) the stress drop.
3.) You should be able to discuss
how the following factors affect the Strength and Ductility of rock (increases
or decreases). You should be able to interpret this information from stress-strain
diagrams.
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|
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Lithology | ||
Anisotropy | ||
Confining Pressure | ||
Fluid Pressure | ||
Effective Stress | ||
Strain Rate | ||
Temperature |
4.) What is "creep"?
5.) Review the three basic stress-strain models for rock behavior (pp. 143-149). The "stiffness" (i.e, the Young's Modulus) is a measure of what rock property? Poisson's Ratio is a measure of what rock property? What is strain hardening and strain softening? What is viscosity a measure of?
6.) What is the Poisson's effect (see p. 145)? Given the density, thickness, and Poisson's ratio of a rock type caculate the magnitude of the horizontal stress produced by vertical loading.