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Test 3 Study Guide - Test3StudyGuide 14:06:00 Forces...

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Test 3 Study Guide 06/12/2010 14:06:00 Forces Body Forces: act on the mass of a body in a way that depends on the amount  of material in the body o ex. gravity (the force of weight is a function of gravity and mass).  these effects are usually very visible o ex. electromagnetic (dislocations) this happens on a microscopic scale Contact Forces: push/pull across a real/imaginary surface of contact o there are three different types of loading (load is a weight a structure  can support and is related to contact force) o Gravitational Loading: force of the weight of the rock o Thermal Loading: temperature change puts stress on rock o Displacement Loading: plate collisions and large scale forces Stress Definition: what deforms a body if strength is exceeded. F/A. pascal. Strain is  evidence of stress in permanent shape change. o Many types but some are uniaxial and axial.  Uniaxial stress forces  sigma 2 or 3 to =0.  Axial stress sets sigmas 1, 2, and 3 not equal to 0. Fracture strengths of rocks can be measures along with orientation of  fractures during experiments.  During these tests you hold one principal  stress constant and then progressively increase or decrease the other  sigmas.   o ex. Tensile: sigma 1 is horizontal and constant and sigma 3 is vertical  and increased.  
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