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≥1200 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600 MPa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。
After being autofrettaged and treated at low temperature under pressure loading of six small and middle size simulation tubes,the elastic strength of three small size simulation tubes before and after machining and other three middle size simulation tubes after machining was tested. Hydraulic pressure cycle fatigue life test was made for all six simulation tubes with inner bore surface cracks prefabricated. The test result indicates that,when autofrettage pressure is from 756 to 792 MPa,the wall thickness ratio W=1.768,the level of overstrain Os=0.8 and the yield strength of the material Rr0.1≥1 200 MPa,the real elastic strength of the simulation tube after machining can be from 700 to 721 MPa. Under the cycle pressure of 600 MPa,all of the six simulation tubes are destroyed with Leak-Before-Break mode,their fatigue life is from 2 504 to 3 499 cycles.
参考文献
| [1] | 黄建文,钱学梅,田雨江,胡俊,吕彦,任泽宁,张贵才,信文君.自紧厚壁圆筒静压强度模拟试验研究[J].兵器材料科学与工程,2010(03):44-46. |
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