What can cause a material's yield strength to be exceeded during repairs?

Choosing to apply excessive force or using improper methods during installation is a significant factor that can lead to a material's yield strength being exceeded. When a material is subjected to forces exceeding its yield strength, it experiences permanent deformation or failure. This is particularly critical in aircraft metal structural repairs, where maintaining the integrity of materials is essential for safety.

Improper methods, such as incorrect alignment during fastening or applying pressure incorrectly, can quickly lead to stresses that surpass the material's yield strength. This not only compromises the repaired section but may also affect adjacent structures.

While insufficient heating, the use of outdated materials, and conducting repairs in excessively cold environments can potentially weaken or limit the effectiveness of repairs, they do not directly relate to the application of force during installation. It is the mechanical manipulation and force application that is most directly responsible for straining the material and thus exceeding its yield strength.