Answer:
Because the creep is made up of many different variables.
Step-by-step explanation:
The creep is a deformation in the solid material that causes the slow, progressive displacement of parts of this material, causing losses and flow. The creep is very difficult to be detected, because it is formed by many variables and the more variables a system presents, the more difficult it is to detect. In addition, the slow movement of the material makes detection even more difficult.
Among the system variables, we can mention the structural load that the material is being exposed to, the temperature, the time of exposure to these elements, among others.