Discussion
Diagram where the horizontal and vertical axes represent the normal (\(\sigma_{n}\)) and shear (\(\sigma_{s}\)) stresses that act on planes through a point are known as :
Answer: C
This is a Mohr diagram.
In a Mohr diagram normal stress is plotted on the horizontal axis and shear stress on the vertical axis. The state of stress at a point is a circle whose centre is the mean stress and whose radius is the maximum shear stress; each point on the circle gives the normal and shear stress on one plane through the point. Adding a failure envelope shows whether the rock will fracture.
The Fry diagram is a method of measuring finite strain from the spacing of object centres. A phi-diagram plots angles in structural or textural analysis, and kinematic flow diagrams describe the flow of material, not the stresses on planes.
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