将6支中小尺寸模拟管进行自紧载压低温处理,对3支精加工前后的小尺寸模拟管和3支精加工后的中尺寸模拟管分别进行弹性强度测试,将具有内表面预制裂纹的6支中小尺寸模拟管进行液压循环疲劳寿命试验。结果表明:当壁厚比为1.768、自紧度为0.8、模拟管材料屈服强度Rr0.1≥1 200 MPa时,精加工后模拟管实测强度为700~721 MPa(自紧压力为756~792 MPa);在循环压力600MPa下,6支模拟管都以穿透型形式泄漏破坏,最终疲劳寿命为2504~3499次。 Six small and medium size simulated tubes were subjected to self-compacting and low pressure treatment. Three small-size simulated tubes before and after finishing and three middle-size simulated tubes after finishing were respectively subjected to elastic strength tests. Six small and medium sized simulation tubes for hydraulic cycle fatigue life test. The results show that when the wall thickness ratio is 1.768, the self-tightness is 0.8 and the yield strength of pipe material Rr0.1≥1 200 MPa is simulated, the measured strength of the simulated pipe after finishing is 700-721 MPa (self-tightening pressure is 756-792 MPa). Under the cyclic pressure of 600MPa, the six simulated tubes all leaked and penetrated, leading to a final fatigue life of 2504 ~ 3499 times.