信頼性設計法の考え方とその導入の意義

抄録

Safety in design, manufacturing and service stages of machines is basically examined by safety factor in the mechanical fields. The safety factors are shown on the standard or codes which usually mean the safety margin against uncertainty such as variability of strength. Typically, allowable stress value is defined by fundamental material strength divided by safety factor. This fundamental concept for safety examination is widely applied for all states of design, manufacturing and service in mechanical fields. This approach is quite simple both for regulator and for designer and has been used for the long time. Recently, drawback of this method is pointed out in order to apply risk management for mechanical structures and the introduction of reliability based design is widely desired. In this forum, application of reliability based design to many industrial fields will be introduced.