According to the general rule, how is the proper rivet diameter determined?

The proper rivet diameter is typically determined by the general rule of the rivet being equal to the thickness of the thickest sheet being joined multiplied by a factor of three. This guideline ensures that the rivet has adequate strength and that it can properly deform to create a secure joint while also considering the rivet's shear strength and the potential load it will bear.

Using three times the thickness of the thickest sheet allows for a balance between sufficient mechanical connection and effective load distribution across the surfaces being fastened. Rivets that are too small may not hold the materials together firmly enough, risking joint failure, while rivets that are too large can be unnecessarily heavy and may complicate assembly.

The alternative options suggest different multipliers, which do not adhere to this established practice. The use of less than three times, such as twice or equal to the thickness, may not provide the necessary strength, while four times can lead to excess material and weight issues without enhanced functionality. This principle helps ensure structural integrity while optimizing weight and efficiency in design.