Cyclic loading refers to a type of mechanical loading applied to a material or structure that involves repeated or alternating stress or strain cycles. This type of loading is common in many engineering applications, including in the design and testing of structures and materials such as metals, composites, and polymers. Cyclic loading can lead to fatigue failure, where cracks and fractures gradually develop and propagate in a material under repeated loading cycles. Understanding the behavior of materials under cyclic loading is important for predicting the service life and reliability of structures and components. Research in cyclic loading involves studying the fatigue properties of materials, developing models to predict fatigue life, and investigating the mechanisms of fatigue failure. This area of research is crucial in various industries, such as automotive, aerospace, and civil engineering, where structures are subjected to repeated loading throughout their lifetimes.