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- W2390901202 abstract "Drilling collar fractures easily occur in drilling operations and are often resulted from cold brittleness especially in winters in the oil fields of North China.An instrumented impact test was conducted on 4145H drilling collar samples,with impact force vs.displacement curves drawn during the process of impact deformation and fracture.And the total impact energy and the fracture initiation energy obtained during the tests were used to calculate its dynamic fracture toughness.The study results show that the impact energy,ductile fracture toughness,dynamic fracture toughness,crack propagation energy,and the ratio between crack propagation energy and impact energy will all decrease as the temperature decreases,while the ratio between the fracture initiation energy and impact energy will increase as the temperature decreases.In drilling,the crack growth rate in the drilling collar is slow and the collar is not liable to fracture at normal temperature.On the contrary,the crack growth rate becomes fast and the collar is subject to fracture at low temperature.The research results will provide reliable guidance for 4145H DC manufacturing and offer basic experimental evidence for the proper drilling collar application in field practices." @default.
- W2390901202 created "2016-06-24" @default.
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- W2390901202 date "2012-01-01" @default.
- W2390901202 modified "2023-09-28" @default.
- W2390901202 title "Instrumented Charpy impact testing and dynamic fracture toughness of 4145H drilling collar steel" @default.
- W2390901202 hasPublicationYear "2012" @default.
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