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首页> 外文会议>Biennial International Pipeline Conference >MODIFIED EQUATION TO PREDICT LEAK/RUPTURE CRITERIA FOR AXIALLY THROUGH-WALL NOTCHED X80 AND X100 LINEPIPES HAVING HIGHER CHARPY ENERGY
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MODIFIED EQUATION TO PREDICT LEAK/RUPTURE CRITERIA FOR AXIALLY THROUGH-WALL NOTCHED X80 AND X100 LINEPIPES HAVING HIGHER CHARPY ENERGY

机译：修改方程以预测轴向穿孔泄漏/破裂标准，轴向穿孔缺口X80和X100线桩具有更高的夏奇能量

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A method of predicting the leak/rupture criteria for API 5L X80 and X100 linepipes was evaluated, based on the results of hydrostatic full-scale tests for X60, X65, X80 and X100 linepipes with an axially through-wall (TW) notch. The TW notch test results clarified the leak/rupture criteria, that is, the relationship between the initial notch lengths and the maximum hoop stresses during the TW notch tests. The obtained leak/rupture criteria were then compared to the prediction of the Charpy V-notch (CVN) absorbed energy-based equation, which has been proposed by Kiefner et al. The comparison revealed that the CVN-based equation was not applicable to the pipes having a CVN energy (C{sub}v) greater than 130 J and flow stress greater than X65. In order to predict the leak/rupture criteria for these linepipes, the static absorbed energy for ductile cracking, (C{sub}(vs)){sub}i, was introduced as representing the fracture toughness of a pipe material. The (C{sub}(vs)){sub}i value was determined from the microscopic observation of the cut and buffed Charpy V-notch specimens after static 3-point bending tests. The CVN energy in the original CVN-based equation was replaced by an equivalent CVN energy, (C{sub}v){sub}(eq), which was defined as follows: (C{sub}v){sub}(eq) = 4.5 (C{sub}(vs)){sub}i. The leak/rupture criteria for the X80 and X100 linepipes with higher CVN energies were reasonably predicted by the modified equation using the (C{sub}(vs)){sub}i value.
机译：基于X60，X65，X80和X100线芯片的静液压全刻度测试的结果，评估预测API 5L X80和X100线纤维件的泄漏/破裂标准的方法。 TW Notch测试结果澄清了泄漏/破裂标准，即初始凹口长度与TW缺口测试期间最大箍应力之间的关系。然后将获得的泄漏/破裂标准进行比较，以预测Chary V-intch（CVN）吸收的基于能量基方程，这已经由Kief ater等人提出。比较揭示了基于CVN的等式不适用于具有大于130 j的CVN能量（C {Sub} V）的管道和大于X65的流量应力。为了预测这些线芯片的泄漏/破裂标准，引入了用于延性开裂的静态吸收能量，（C {{sub}（Vs））{sub} i，如图所示的管材的断裂韧性。 （C {sub}（Vs））{sub} i值是根据静态3点弯曲试验后切割和抛光夏比V-intch样本的显微镜观察。原始CVN的等式中的CVN能量由等效的CVN能量，（C {sub} v）{sub}（eq）替换，其定义如下：（c {sub} v）{sub}（eq ）= 4.5（c {sub}（vs））{sub} i。通过使用（C {Sub}（VS））{Sub} I值，通过修改的等式预测具有较高CVN能量的X80和X100线路焊接标准的泄漏/破裂标准。

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