Introduction to Different Types of Buckling — Lesson 3

This lesson covers the kinetic approach for estimating the critical load of structural elements and different types of buckling: classical, finite disturbance, and snap-through buckling. It delves into the dynamic approach, where the governing differential equation of small vibration of an elastic system is written at some level of external load. The lesson also explains the concept of natural frequency and how it tends to zero when the applied load approaches the Euler load. It further discusses the differences between small and large deflection theories and the impact of load on the stiffness of shell panels. The lesson concludes with an explanation of snap-through buckling, where there is a sudden jump from one equilibrium configuration to another with large displacement.

Video Highlights

00:32 - Introduction to kinetic approach for estimating the critical load of structural elements
05:46 - Explanation of different types of buckling: classical buckling, finite disturbance buckling, snap through buckling
10:47 - Explanation of the loss of stiffness after buckling
14:55 - Discussion on the load deflection plot for arch buckling

Key Takeaways

- The kinetic approach is used to estimate the critical load of structural elements.
- Classical buckling, also known as bifurcation buckling, is common in column or plate buckling.
- Finite disturbance buckling is seen in the case of shell panel buckling, where there is a significant loss of stiffness after buckling.
- Snap-through buckling involves a sudden jump from one equilibrium configuration to another with large displacement.
- The natural frequency of a system tends to zero when the applied load approaches the Euler load.