Industrial equipment rarely fails without warning. More often, it degrades gradually under repeated stress until a small crack becomes a serious structural issue. Fatigue isn’t the result of a dramatic event. It is a process that develops under normal operating conditions, particularly in components that experience vibration, cyclic loading, or thermal expansion and contraction. Understanding how and why fatigue develops allows facility managers and maintenance teams to act early, before downtime and structural compromise become costly realities.  Fatigue begins at the microscopic level. Repeated stress cycles create localized strain within the grain structure of metal. Over time, this strain concentrates around weld toes, drilled holes, sharp transitions, and threaded regions. These stress…