GLY3400 Study Guide Exam 2

# GLY3400 Study Guide Exam 2 - GLY3400 Exam 2 Study Guide 1...

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Exam 2 Study Guide 1 A. Continuum Mechanics, Coordinate System a. Position of particles is important in mechanics b. Mechanical state of a system describes instantaneous properties in time c. Array of vectors = field array of velocity vectors = velocity field B. Discontinuity in Material a. Faults b. Deformation of crystals C. Changes in state Displacement, strain, stress a. 2 points in time Now & when primary structure formed i. Displacement vector: distance b/w the 2 points ii. Infinite # of displacement vectors D. 4 Components of Displacement a. Rigid Body Translation: structure stays same; just moves location; angles, shape stay the same b. Rigid Body Rotation: Angles, vectors have rotated c. Volume Change: (or Dilation) No change in shape; just in Volume (decrease in vol = negative) (increase in vol = positive) d. Distortion: change in shape – aka Strain E. DISTORTION/ STRAIN a. Fault Zone = high distortion ; External belt of Mountain = low distortion b. Strain: change in shape of material (can see strain but not stress) i. Stress produces strain c. Elongation: changes in length of line F. 2 Classes of Strain a. Homogeneous Strain: straight lines stay straight, parallel lines stay parallel i. Homogeneously change a sphere into a ellipsoid 1. Biaxial Ellipsoid: ex football, discus 2. Triaxial Ellipsoid: ex cough drop b. Inhomogeneous Strain: displacement vectors smoothly change thru space G. 2 types of Strain a. Normal Strain: elongation b. Shear Strain: changes in angles b/w perpendicular lines i. Simple shear : deformation in individual planes, pure shear + rotation of axis H. Finite Strain a. Deformation @ diff times, depths have nothing to do w/ each other b. Instantaneous of stress on material produces Infinitesimal strain c. All infinitesimal strain adds up to finite strain I. Principle axis of strain a. Perpendicular to each other b. In deform state c. Lines of particles are perpendicular in undeformed J. Strain Ellipsoids - need to know orientation & magnitude of principle axis to find a. K. Need MARKERS to See Strain a. Types of markers : bedding, individual crystals in igneous rocks L. M. ELASTIC BEHAVIOR a. Hooke’s Law : Law of Elasticity = Stress proportional to Strain . i.

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## This test prep was uploaded on 04/19/2008 for the course GLY GLY3400 taught by Professor Tull during the Spring '08 term at FSU.

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GLY3400 Study Guide Exam 2 - GLY3400 Exam 2 Study Guide 1...

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