2020 Volume 56 Issue 12 Pages 491-503
The reliability of the adhesive joint, that is, the probability that the joint functions properly, depends on the degree of durability against stresses such as temperature, humidity, mechanical stress, sunlight, wind and rain, the degree of joint strength and confficient of variation, and the redundancy of the joint system such as spot welding and riveting used together or not. Here, we will explain the method for promptly calculating the failure probability of adhesive joints after use for a certain period and the safety factor（ average strength of the joint / average mechanical stress） required to secure the predetermined failure probability based on a stress-strength model using the EXCEL calculation sheet for the standard normal distribution function（ NORMSDIST） and its inverse（ NORMSINV）.
