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.
 
 

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.