Discussion Overview
The discussion revolves around calculating the spring back force required to hold a flat steel sheet in a cylindrical shape during bending. Participants explore the complexities involved in the bending process, particularly focusing on the material properties and the implications of exceeding the elastic limit.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- Sameer inquires about a formula for calculating the spring back force for bending a 3.5mm thick steel sheet into a hollow cylinder.
- Some participants note that bending a sheet into a circle typically results in a shape that does not return to flat, indicating the need to consider both plasticity and elasticity.
- One participant suggests that the force required to hold the sheet in a cylindrical shape may be difficult to calculate due to exceeding the elastic limit.
- Another participant mentions that the force needed may depend on empirical determination, suggesting that the final dimensions will influence the spring back force.
- There is a discussion about whether the initial bending will affect the final shape and the potential for a slight tear-drop cross-section if the edges are drawn close to weld them.
- Sameer expresses a desire to understand the force required for machine capability, specifically regarding a roller pushing against the coil's tail end.
Areas of Agreement / Disagreement
Participants generally agree that calculating the spring back force is complicated and that empirical methods may be necessary. However, there is no consensus on a specific formula or method to determine the force accurately.
Contextual Notes
The discussion highlights the limitations in calculating the spring back force due to the complexities of material behavior beyond the elastic limit and the dependence on specific bending conditions.