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Understanding Mohr's Circle and Stress Analysis in Structural Geology

Learn about Christian Otto Mohr, the developer of the graphical method for stress analysis known as Mohr's circle, and how it can be used to analyze faults, stress, and tractions on boundaries. This method helps determine normal and shear tractions on different planes in structural geology.

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Understanding Mohr's Circle and Stress Analysis in Structural Geology

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  1. GLG310 Structural Geology

  2. GLG310 Structural Geology

  3. q is measured positive counterclockwise from s1 to the normal to the surface of interest

  4. Christian Otto Mohr (October 8, 1835 – October 2, 1918) was a German civil engineer. In 1882, he famously developed the graphical method for analysing stress known as Mohr's circle and used it to propose an early theory of strength based on shear stress. http://en.wikipedia.org/wiki/Christian_Otto_Mohr GLG310 Structural Geology

  5. Faults, stress, and tractions Mohr Circle Graphical construction that lets us visualize the relationship between the principal stresses and tractions on a boundary (like a fault). • measured positive counter clockwise from s1 direction to normal of plane of interest 2q measure positive counterclockwise from sn direction on Mohr circle

  6. GLG310 Structural Geology

  7. GLG310 Structural Geology

  8. Movie GLG310 Structural Geology

  9. N40E Using both the Mohr circle and the fundamental stress equations, determine the normal and shear tractions on the two planes. For Mohr circle, use 1 cm = 10 MPa)

  10. Faults, stress, and tractions -Davis and Reynolds GLG310 Structural Geology

  11. -Engelder, 1993, Stress regimes in the lithosphere, Princeton Univ. Press GLG310 Structural Geology

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