The surface influence of the quantity upon the tired strength

            The surface  influence of the quantity upon the tired strength

  China CNC machiningThe tired breakage that metals produce after be subjected to hand over to change to carry the lotus function usually takes place under the cold and hard layer of the spare parts surface and surfaces, therefore the surface quantity of the spare parts affects to the tired strength very greatly.  

  1. The surface  influence of the rough degree upon the tired strength  At hand over to change to carry the lotus function under, the surface  part of the cave valley of the rough degree causes easily should the dint concentration, produce the tired crack.A value of surface is more big, the crackle  of the surface is more deep, the crackle  bottom radius is more small, the anti-  tired breakage  bottom ability is more bad. 

  2. China CNC machining  Remaining dint, cold make to harden to the influence of the tired strength  Remaining dint is very big to the spare parts  influence of the tired strength.The surface layer remaining pull should the dint will make tired crack extend, accelerating the tired breakage;But the surface layer  remaining should the dint can keep tired crack from expand, defer tired breakage of creation.   China CNC machining Surface the cold and hard general companion contain remaining of should the creation of the dint, can keep the crack creation from combine the arrestment already has the crack to expand, to raise the tired strength beneficial.