Which property of a patch should be prioritized when repairing a stressed skin?

When repairing a stressed skin, the shear strength of a patch is the most critical property to prioritize. Stressed skin structures, commonly found in aircraft, rely on the skin to bear loads and maintain the overall structural integrity of the aircraft. For this reason, it is essential that any patch used in the repair has sufficient shear strength to withstand the forces that the structure will encounter during operation, including aerodynamic loads and any additional stresses from maneuvers or turbulence.

A patch with high shear strength will ensure that the repair can effectively distribute stresses throughout the structure rather than focusing them in one area, which could lead to further damage or structural failure. This property ensures that the repair maintains the aircraft's performance, safety, and operational integrity.

While aesthetics, ease of installation, and cost are important factors in the overall repair process, they should not compromise the shear strength of the patch. A repair that compromises shear strength for the sake of ease or cost can lead to much greater maintenance issues and safety risks down the line. Therefore, focusing on the shear strength is crucial in ensuring a reliable and safe repair to the stressed skin.