Transformation of Stresses and Mohr Circle in 3-D — Lesson 1

This lesson covers the concept of stress transformation in three dimensions. It begins with an explanation of the Deviatoric part of the straight sense, sigma i j dash, and its principal directions. The lesson then delves into the equations for the associated stresses, the principle stress, and principle directions. The instructor also explains the concept of non-zero solutions for the directed cosines l, m, and n. The lesson further discusses the transformation of stresses from one system of coordinates to another. It concludes with an illustration of how to draw Mohr's circle in three dimensions based on the relations of normal stress and shear stress on a plane.

Video Highlights

01:27 - Discussion on the determinant of the position matrix and its significance
08:26 - Explanation of the transformation of stresses from one system of coordinates to another.
13:57 - Discussion on the transformation of stress tenses and the use of indicial notation.
22:28 - Explanation of the transformation rule for the second rank tensor
45:46 - Discussion on the construction of Mohr circles in three dimensions.

Key Takeaways

- The Deviatoric part of the straight sense, sigma i j dash, has its principal directions and associated stresses.
- The principle stress and principle directions are given by a set of equations.
- Non-zero solutions for the directed cosines l, m, and n are necessary for the expansion of these equations.
- The transformation of stresses involves moving from one system of coordinates to another.
- Mohr's circle in three dimensions can be drawn based on the relations of normal stress and shear stress on a plane.