Fatigue testing is a method used to evaluate the durability of materials and components under repeated loading and unloading cycles. This process helps identify how long a material can withstand stress before it fails, which is crucial in industries like aerospace, automotive, and construction. During fatigue testing, samples are subjected to controlled stress levels until they break. The results provide valuable data on the material's lifespan and performance, allowing engineers to design safer and more reliable products. Common standards for fatigue testing include those set by organizations like ASTM and ISO.