Self-Punching Rivet Element With Wavy Edge for Lower Setting Force

The fastening section is segmented into multiple curved sections (first, second, third, and fourth curved sections) that are distributed around the hollow space. This segmentation allows the reshaping forces to be distributed across multiple discrete locations rather than concentrated in a single area, enabling the structure to absorb shear forces effectively while reducing the peak setting forces required during fastening.

Different regions of the fastening section have different geometries optimized for their specific functions. The curved sections are positioned and shaped to create specific stress distribution patterns during reshaping, with each curved section contributing to force absorption at its local location. This local optimization allows the structure to achieve high connection reliability without requiring uniformly high material thickness throughout.

Instead of using a uniformly thick wall, the design segments the fastening section into multiple curved sections that strategically position material where it is most needed for stress absorption. This segmented approach provides sufficient connection strength through optimized material distribution rather than through increased overall wall thickness, thereby reducing device complexity and material usage.

The fastening section incorporates multiple curved sections with specific radii of curvature that are optimized to distribute stresses during reshaping. The curved geometry allows for more efficient stress distribution compared to straight sections, enabling the structure to achieve required strength with less material and lower complexity.

The circular wall is segmented into multiple curved sections that create additional material zones within the same overall footprint. This segmentation increases the effective material availability for absorbing reshaping stresses without significantly complicating the manufacturing process, as the segmented design can still be produced using standard forming techniques.

The design transitions from a simple two-dimensional circular wall to a three-dimensional segmented structure with curved sections that extend in multiple directions. This dimensional complexity allows for increased material availability and stress absorption capacity while maintaining compatibility with conventional manufacturing processes.

The fastening section is divided into multiple curved sections that are strategically positioned around the hollow space. During reshaping, these segmented sections engage with the die at different times and locations, creating a more efficient force distribution pattern. The segmentation allows the reshaping process to progress sequentially through different regions rather than requiring uniform force application across the entire circumference simultaneously.

The reshaping process becomes dynamic rather than static, with forces being applied and distributed sequentially across the segmented curved sections. As the element is set, the curved sections engage with the die in a progressive manner, allowing the force distribution to adapt to the local geometry and material properties at each stage of the reshaping process.