Because it is an insidious problem. It grows inside the structure but you cannot see it. It is the cancer of metal.
It gives no visual indication of the problem until a tiny crack appears near the end of the service life of the component. The initial crack is so tiny, that you can not see it with the naked eye. It can only be found by special die penetration or X-ray tests.
By then, 90% of its life is gone. It takes another 5% until the crack becomes visible to the eye. Now, almost 95% of the service life is gone. If you can not fix the remaining 5%, you will be facing catastrophic failure.
Please watch the following video to see the stages a structural member goes through before it breaks. It is a condensed video showing 500,000 fatigue cycles in a matter of minutes.
Very valuable, please watch until the end.
What you see is the condensed last 30 minutes of a 5-hour long test. 90% of service life is already consumed in the past 4 hours. There was no visible change during these 4 hours.
Now we come to the most important part: WHAT CAN WE DO?
Please proceed to the next page to see how FatigPro handles this insidious problem.