Research on Fatigue Load Spectrum of Fracturing Pump Plunger Based on Damage Equivalence
In shale gas operations,fracturing pump plungers are subjected to periodic loads and are prone to fatigue failure,there is no measured fatigue load spectrum required for fatigue calculation in the development initial stage of the fracturing pump plunger prod-ucts.In view of this problem,the strain load spectrums of the plunger assembly were tested by millions of strokes of 6000 mechanical fracturing pump,certain methods were adopted to make equivalent spectrum for fatigue load spectrum of the plunger,and the fatigue life of the plunger was assessed and the design of the plunger structure was optimized,and finally the plunger design data were locked.The analysis shows that the fatigue durability of the plunger can be evaluated and the product quality can be improved by combining test and simulation.In order to reduce the design and verification time of heavy parts,the fatigue load spectrum of the plunger was obtained by a certain method based on the collected load spectrum.Based on equivalent damage principle,the load spectrum of plunger bench test was extracted by block cycle method,which provided design basis for the subsequent construction of plunger bench test bench.
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