An Improved Testing Device for Measuring Tangential Expandability of Beryllium Tube
An Improved Testing Device for Measuring Tangential Expandability of Beryllium Tube
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改进的铍管切向扩容测试装置
DOI：
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发表时间：
1966
期刊：
影响因子：
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通讯作者：
Y. Mishima
中科院分区：
文献类型：
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作者：
Y. Mishima
已经开发了一种改进的装置，用于测量包壳管的切向膨胀性，特别是在铍中，这是重要的，因为Be和UO 2之间的热膨胀系数的差异将产生应力，并且在每次反应堆关闭时在低于250°C的温度下引起包壳的切向伸长。开发了两种新器械，经过比较，发现更好的方法是采用长度最适合样本长度的圆柱形导线塑性变形插入物。该装置可在be包壳中产生倾向于扩大管直径的单轴切向拉伸应力，再现在实际反应器关闭的情况下的主要条件。给出了在Al和Magnox管上的初步试验结果，以及在通过各种工艺制造的Be管上获得的结果的第一个帐户。
An improved device has been developed for measuring the tangential expandability of cladding tubes, especially in beryllium, which is important since the difference in thermal expansion coefficient between Be and UO2 will cause stress, and bring about tangential elongation of the cladding at temperatures below 250°C every time the reactor is shutdown. Two new devices were developed, and upon comparison, the better method was found to be that incorporating a cylindrical lead plastically deforming insert of length best suited to the specimen length. This apparatus can produce in the be cladding a uniaxial tangential tensile stress tending to expand the tube diameter, reproducing the conditions prevailing in the case of actual reactor, shutdown. Preliminary test results on Al and Magnox tubes, and a first account of the results obtained on Be tube fabricated through various processes are given.