In this paper,the failure analysis of the small end fracture of the piston rod of a heavy construction machinery hydraulic cylinder is carried out,and it is proposed that the main reason for the failure of the small end fracture of the piston rod of heavy equipment is the overlap of the stress amplitude region of the alternating stress produced by the push and pull of the cylinder size cavity and the region of the load reduction groove where the stress of the small end variable section is maximum without changing the field processing conditions.Starting from these two dimensions,a solution is proposed to distribute the load reduction groove area where the variable section stress of the small end of the piston rod is the largest and the stress amplitude area of the cylinder size cavity.The effectiveness of the improved measures is verified by 2F bench test on the cylinder accelerated life reliability test platform,which finally solves the fatigue fracture problem of the small end of the piston rod of the heavy-duty cylinder.
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