The high-pressure manifold,as one of the main vulnerable components in fracturing equipment,poses significant risks when it fails.Its failure is mainly attributed to fatigue,erosion,corrosion,or puncture and rupture caused by material defects,with fatigue failure being the most unpredictable.Currently,research on the fatigue performance of materials used in high-pressure manifolds is not sufficiently thorough.To address the accurate description of the fatigue life of materials used in high-pressure manifolds,a series of fatigue tests were conducted using a domestically produced high-pressure manifold material as an example.Based on the experimental data,various distribution models and different S-N models were used for fitting analysis,and the P-S-N model with the strongest comprehensive fitting capability was identified.The results indicate that,in the medium to long fatigue life range,the Weibull three-parameter model exhibits the best comprehensive evaluation capability at seven stress levels.For survival rates of 50％,90％,99％,and 99.9％,the fitting coefficients of the exponential S-N model are all greater than 0.98,demonstrating the best fitting capability.The derived P-S-N curve most accurately describes the fatigue performance of the high-pressure manifold material,providing an effective basis for the fatigue life design of high-pressure manifolds.
维普
万方数据