How is "shear strength" defined in context with sheet metal joints?

Shear strength refers to the maximum load a material can withstand before failing in shear mode. In the context of sheet metal joints, this is particularly relevant because these joints are often subjected to forces that can create shear stress. When two layers of material are joined, understanding how much force they can handle before separating or shearing apart is critical for ensuring the integrity of the structure.

Shearing occurs when forces are applied parallel to the surface of a material, effectively sliding one part of the material past another. In design and manufacturing, knowing the shear strength helps engineers select appropriate materials and joint designs to prevent failure under anticipated loading conditions. This is essential for safety and reliability in the final product, especially in applications like aircraft, where structural integrity is paramount.