Handrail Solid Wood Processing Table

④ Fretting wear Fretting wear is the surface damage caused by relatively small vibrations on the two fixed contact surfaces, which mainly occurs on the surfaces of macroscopically relatively static parts combined with small rural hardware processing plants. The main harm is to reduce the fitting accuracy, loosen the tightly fitted body, and more seriously cause stress concentration, resulting in fatigue fracture of parts. ①Overload fracture When the applied load exceeds the limit stress that its dangerous section can bear, the part will break, which is called overload fracture. Unreasonable strength design of parts, excessive stress concentration on structure, operation error, overloaded operation of mechanical equipment, and excessive load on some parts may lead to overload fracture.

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