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Effect of Plastic Deformation and H_2S on Dynamic Fracture Toughness of High Strength Casing Steel 被引量:1
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作者 曾德智 ZHANG Naiyan +3 位作者 TIAN Gang HU Junying ZHANG Zhi SHI Taihe 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第2期397-403,共7页
The effects of plastic deformation and H2 S on fracture toughness of high strength casing steel(C110 steel) were investigated. The studied casing specimens are as follows: original casing, plastic deformation(PD)... The effects of plastic deformation and H2 S on fracture toughness of high strength casing steel(C110 steel) were investigated. The studied casing specimens are as follows: original casing, plastic deformation(PD) casing and PD casing after being immersed in NACE A solution saturated with H2S(PD+H2S). Instrumented impact method was employed to evaluate the impact behaviors of the specimens, meanwhile, dynamic fracture toughness(JId) was calculated by using Rice model and Schindler model. The experimental results show that dynamic fracture toughness of the casing decreases after plastic deformation. Compared with that of the original casing and PD casing, the dynamic fracture toughness decreases further when the PD casing immersed in H2 S, moreover, there are ridge-shaped feature and many secondary cracks present on the fracture surface of the specimens. Impact fracture mechanism of the casing is proposed as follows: the plastic deformation results in the increase of defect density of materials where the atomic hydrogen can accumulate in reversible or irreversible traps and even recombine to form molecular hydrogen, subsequently, the casing material toughness decreases greatly. 展开更多
关键词 sour gas fields high strength casing C110 steel plastic deformation H2S fracture toughness
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Closed patella fracture combined with cruciate ligament injury: a case control study 被引量:3
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作者 Li Han Wang Wei +5 位作者 Liu Yue-ju Chen Wei Zhang Qi Li Xu Zhu Lian Zhang Ying-ze 《Chinese Medical Journal》 SCIE CAS CSCD 2013年第20期3856-3859,共4页
Background Patellar fracture and cruciate ligament injury are a common consequence of traumatic knee injury. Patellar fracture combined with cruciate ligament injury is rarely reported, although the mechanisms of two ... Background Patellar fracture and cruciate ligament injury are a common consequence of traumatic knee injury. Patellar fracture combined with cruciate ligament injury is rarely reported, although the mechanisms of two things are similar. This study aimed to evaluate the incidence of closed patella fracture combined with cruciate ligament injury. 展开更多
关键词 case control study patellar fracture cruciate ligament injury high-energy trauma
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