GLY3400 Study Guide Exam 3

# GLY3400 Study Guide Exam 3 - A Fracture Envelope parabola a...

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A. Fracture Envelope: parabola a. Pure joint = connects at 1 point b. Fracture = connects at 2 points B. Differential Stress = σ 1 – σ 3 (size of the circle) C. Intragranular Mechanism Movement (plastic deformation) a. Ex. diffusion, translation gliding, dislocation movements b. c. Rocks deform plastically – ex. translation D. Translation Gliding a. Value of τ on Miller Plane – Not dependent on Normal Stress b. Quartz has 6 glide planes – (they have shear stress unless it’s a principle stress) c. High depths = Increasing Confining pressure E. Von Mises Criteria of Flow a. Failure law that takes over when the failure envelope flattens out b. Won’t get Fracture b/c rock to weak when it reaches the Von Mises Envelope c. Critical yield stress is surpassed; rock will fail by ductile shear along “planes” of max shear stress F. Brittle- Ductile Transition a. σ 3 = max depth of faulting in dry rocks b. Fluid makes rocks More Brittle i. Increase Fluid Pressure causes Confining Pressure Decrease c. Earth Crust Increase confining pressure & temp gliding more likely to occur STRUCTURES G. Brittle Fractures = Joints a. Joint = a fracture; rocks move perpendicular to the fracture b. Joints are the MOST COMMON Secondary Structure

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GLY3400 Study Guide Exam 3 - A Fracture Envelope parabola a...

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