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20 Cards in this Set
- Front
- Back
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dynamic/mechanical analysis |
interpret stresses that produce deformation |
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density |
m/v; gravity drives large % or deformation |
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body forces |
act on every point within a body Ex. PE & electronically |
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Force |
-vector quantity, direction & magnitude -that which changes -body motion |
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surface/contact force |
act on specific surface Ex. PE loading, thermal loading, displacement loading |
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Stress |
what tends to deform a body -deformation depends on how F is distributed -Pascals -100MPa = 1kbar |
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lithostatic pressure |
confining pressure or vertical stress, is the pressure or stress imposed on a layer of soil or rock by the weight of overlying material. -3-4 km = 1km |
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vertical force |
ρVg |
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vertical stress |
ver. F/area = ρLg |
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stress traction |
resolving stress into normal and sheer components because it is not perpendicular to surface |
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Complete definition of stress |
descriptions of tractions at a given point on all possible surfaces going through said point |
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Mohr Stress diagram |
1. plot σ1 &σ3 - direction of no sheer so on x-axis 2. draw a line representing the plane 2θ measured from σ3 -plot from σ1 |
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differential stress |
σ1- σ3 diameter of Mohr circle causes distortion |
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mean stress |
( σ1+ σ3)/2 center of Mohr circle causes dilation |
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deviatoric stress |
(σ1- σ3)/2 causes distortion radius of Mohr circle |
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hydrostatic stress |
equal stress magnitude in all directions |
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uniaxial stress |
Tensile - σ3 is -, σ2 & σ1 are zero Compressive - σ1 is +, σ2& σ3 are zero |
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Triaxial stress |
σ1> σ2> σ3 can be positive or negative |
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Coulomb Failure Criterion |
If confining pressure on rock progressively increases, then magnitude of differential stress required to cause rock to fail increases True in upper crust, brittle deformation |
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Beach balls |
-light is compression (σ1) -black is tension (σ3) |
