Introduction to 3D Constraints and Relative Deformations

This lecture covers the generalized Hooke law, constraints and flexibility matrices in 3D, relative strain, normal and shear stresses, stress matrix construction, and the calculation of stress from relative strain. It also explores the importance of looking inside objects to determine stresses, the effect of internal forces on bars of different sections, and the relationship between stress and relative strain. The Hooke law for normal and shear stresses, modulus of elasticity, and shear are discussed, along with the representation of relative deformations in 3D.