... for bending
The differential equation for kinematic relations for bending is based on a displaced the infinitesimal small beam:
leading to :
and
leading to :
This is treated in chapter 4.3.1 of the book Engineering Mechanics Volume 2 Hartsuijker & Welleman, 2007.
- Hartsuijker, C., & Welleman, J. W. (2007). Engineering Mechanics: Volume 2: Stresses, strains and displacements. Springer Netherlands. 10.1007/978-1-4020-5763-2