Review from LAB #3.

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Presentation transcript:

Review from LAB #3

Grain-scale shear sense

Homework examples delta-type

Homework examples S-C Mylonite when you know the schistose foliation and shear bands formed at the same time than S-C mylonite. Develop best in a micaceous granite protolith S

Homework examples sigma-type

The Traction Vector and Stress Tensor LAB #4 The Traction Vector and Stress Tensor

From Force to Stress Traction Force Stress at a Point Surface Stress

The Stress Tensor “on in”

Sign Convention Positive Shear Stress Negative Shear Stress Determined by direction of traction acting on negative coordinate face Negative Shear Stress Tractions are positive in negative coordinate direction

Principle Stresses

Stresses in Principal Stress Frame angle is between normal to plane and maximum principal stress orientation

The Mohr Circle a way to visualize the relationship between shear and normal stresses