When would partial shear failure be evident in removed rivet shanks?

Partial shear failure of rivet shanks typically manifests when there are joggles present. Joggling refers to a bending or misalignment in the rivet shank, leading to uneven stress distribution during loading. As the rivet bears loads, the presence of joggles can create points of weakness where the shear forces may induce failure, resulting in a partial shear scenario.

This condition can be particularly indicative of structural issues, as the integrity of the joint is compromised. Understanding the context of how loads are transmitted through joint connections is crucial in identifying potential failure mechanisms in aerospace structures. In contrast to joggles, the other options do not directly relate to the occurrence of partial shear failure. Excessive corrosion typically affects the overall integrity of the rivet but doesn't specifically indicate shear failure. The absence of the head suggests complete failure rather than a partial one, while an intact shaft indicates that the rivet may still be serving its purpose without revealing signs of shear failure, especially if no joggles are present.