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首页> 外文会议>Recent advances in fracture >Predicting the ductile-to-brittle transition in nuclear pressure vessel stells from charpy surveillance specimens
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Predicting the ductile-to-brittle transition in nuclear pressure vessel stells from charpy surveillance specimens

机译：从夏比监测标本预测核压力容器星轮的韧性到脆性转变

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One important application of elastic-plastic fracture mechanics has been to assure the structural integrity of nuclear reactor pressure vessels. Presently a lower boudn K_(IR) toughness curve is shifted relative to a reference temperature RT_(NDT) and used to define the ductile-to-brittle transition. The RT_(NDT) is thus a very critical value and is defined very conservatively in terms of Charpy and dynamic teat specimen results. Continued application of these requirements are now a principal limitation to continued operation of several commercial nuclear power plants. Recent work by ASTM Committee E08 has proposed a method to obtain a new reference temperature and a method to define, using a probabalistic approach, a median ductile-to-brittle transition curve from a set of six properly tested small samples which would in many cases be precracked Charpy specimens. Statistical confidence bounds would then be available for this median transition "Master Curve" which would be specific to the particular nuclear plant of interest, and could be used to assure that the pressure vessel had adequate toughness for continued operation.
机译：弹塑性断裂力学的一项重要应用是确保核反应堆压力容器的结构完整性。目前，较低的boudn K_（IR）韧性曲线相对于参考温度RT_（NDT）发生了偏移，并用于定义韧性到脆性的转变。因此，RT_（NDT）是一个非常关键的值，并根据夏比和动态奶头样本结果非常保守地定义。现在，继续应用这些要求已成为几个商业核电站继续运行的主要限制。 ASTM委员会E08的最新工作提出了一种获取新参考温度的方法，以及一种使用概率方法从一组六个经过适当测试的小样品中定义韧性到脆性转变曲线的中位数的方法，在许多情况下，预裂夏比（Charpy）标本。然后对于该中值过渡“主曲线”可获得统计置信范围，该中值过渡特定于所关注的特定核电站，并且可用于确保压力容器具有足够的韧性以继续运行。

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