Failure Assessment Research of Flawed Ductile Metals Used in Nuclear Plant
A new method based on Gurson model to estimate plastic collapse failure for flawed high energy pipelines is put forward.First,standard fracture toughness measurement is explored on contact tension specimen made of ductile metal of S355.With increasing load,crack tip collapse occurs instead of crack extension,and local yielding appears around crack tip not the whole ligament,which coincides with recent research that NSC (neck-section-collapse) overestimates structure loading capability.From the test results,a method based on J-P curves is used to estimate collapse loads for contact tension specimen with different crack length.Second,tension process of contact tension specimen is simulated by finite element method combining with Gurson model,which is proved to simulate structure plastic failure well.Then,Gurson model is adapted to simulate failure process of circumferential cracked pipeline made of S355 with internal pressure.Finally,relationship between crack length and collapse CMOD (crack mouth opening displacement) is built,which is important for integrity assessment of nuclear pipelines.
Gurson model Plastic limit load Integrity assessment of nuclear pipelines
Tieping Li Rui Liu Lijing Wen
Nuclear and Radiation Safety Center of MEP, NO.54 Hong Lian Nan Cun, Beijing, 100082, China
国际会议
2012 International Symposium on Safety Science and Engineering in China (2012安全科学与工程国际会议)
北京
英文
101-107
2012-11-07（万方平台首次上网日期，不代表论文的发表时间）