What is the minimum edge distance for rivets?

The minimum edge distance for rivets is essential because it influences the structural integrity and performance of the joint. The term "edge distance" refers to the distance from the center of the rivet to the nearest edge of the material.

An edge distance of 2D (where D is the diameter of the rivet) is commonly recommended to ensure adequate strength and to prevent issues like tearing or shear-out, which can occur if the edge distance is too short. This distance provides sufficient material on either side of the rivet to effectively transfer loads and resist failure modes.

In contrast, while smaller edge distances might seem acceptable, they bring an increased risk of compromising joint strength, leading to potential structural failures over time. Edge distances greater than 2D are often recommended for specific applications, but the minimum requirement is established at this distance for standard practices in aircraft structural repair.