Abstract ▼ AI-Helper

Frequently, machines or structures have to endure repeatedly changing load during their operation. Damages caused by the repeated load are accumulated,and cracks occur even under their yield stresses this in turn triggers fatigue failures. This is mostly due to failures inside materials or cracks in...

Frequently, machines or structures have to endure repeatedly changing load during their operation. Damages caused by the repeated load are accumulated,and cracks occur even under their yield stresses this in turn triggers fatigue failures. This is mostly due to failures inside materials or cracks in parts with intensive stress. Cracks in the vacuum chambers used for manufacturing thin film solar cells or LCDs were observed. Fatigue stress occurs in the weld zone of vacuum chambers since some chambers are repeatedly compressed or expanded by their loading or unloading. This creates cracks,and the desired vacuum level cannot be obtained. To analyze the issue on the weld zone, fatigue tests were conducted, and the fatigue life and fatigue strength of the weld zone of vacuum chambers were examined in this study.