GEOLOGY 1 Lecture Notes - Lecture 6: Modulus Guitars, Ductility, Work Hardening
Document Summary
In 2d stress field is a circle, in 3d a sphere. Special stress field where equal stress magnitude in all directions. All stress normal to point/plane, no shear stress component. No deformation - a type of static equilibrium. We can also consider the stress state at a point by defining stress components (s, n) on an infinitely small cube in a cartesian reference frame. In total there are 9 stress components (3 normal (black), 6 shear (red)) The mathematical representation of the 9 stress components defining stress at a point is the stress tensor. First index denotes the coordinate axis to which the surface is normal. Second index denotes the direction in which the component acts. 4 components in 2d, 9 components in 3d. The mohr diagram is a simple graphical method for determining. The state of stress at a point. The values of s, n for any surface through that point.
