mid-term_review - REVIEW FOR EXAM 2 Strain 1. Elastic 2....

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REVIEW FOR EXAM 2 Strain 1. Elastic 2. Recoverable Deformation 1. Translation: No change in shape, movement is lateral 2. Rotation: No change in shape, movement is radial 3. Distortion: change of size and/or shape a. Recoverable: elastic, goes away when stress is removed b. Non-recoverable: permanent distortion that remains once stress is removed Remark: Hydrostatic pressure occurs when σ 1= σ 2= σ 3. Because stress is the same everywhere, no shape change occurs. When σ 1- σ 3=n, a shape change occurs. This is called differential stress. Elongation e=(L-L 0 )/L 0 L= deformed length L 0 = original length Another way to look at strain Finite: last increment in history Increment: step by step view Kinematic Analysis Reconstruction of movements during rock deformation without reference to forces or pressures responsible for deformation Strain Ellipse Strain Ellipsoid
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(Shearing is the same as Plane Strain) Areas of Flattening creates a space problem, and you can also have volume loss. Pure Shear (has no rotational component) vs. Simple Shear (has rotational component, s 1 and s 2 aren’t perpendicular) Angular Shear ( ϕ )
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Measurement of change of angles between lines o Find a perpendicular line to A ( which is B) o ϕ is negative if B prime rotated counter clockwise from B and positive if it rotate clockwise from B. Negative
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mid-term_review - REVIEW FOR EXAM 2 Strain 1. Elastic 2....

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