作者：赵兴华, 唐韵, 徐尹杰, 邢鲁, 贺云

作者单位：中国测试技术研究院，四川 成都 610021

关键词：内压法;锆合金;薄壁管;泊松比

摘要：

锆合金包壳管在核电应用中存在变形及破裂等问题，严重影响核电运行安全。为了更好地评价锆合金包壳管等薄壁管材受内压时的变形性能，给燃料组件的设计、计算、验证提供参考，设计基于内压法的泊松比测试方法。根据薄壁圆筒受均匀内压时的应力解，推导出基于内压加载的薄壁管泊松比理论公式。按照该理论公式设计合理的内压试验方法，采用该方法对N36锆合金薄壁管开展20~400 ℃下的泊松比试验，同时通过拉伸法进行相应温度下的对比试验。结果表明，内压试验方法可以有效获得不同温度下锆合金薄壁管的泊松比，且内压试验方法得到的锆合金薄壁管泊松比与拉伸法结果较为一致，相对误差均在2%以内。试验结果同时表明：N36锆合金薄壁管的泊松比随试验温度的增加呈增大趋势。

Experimental study on Poisson’s ratio of zirconium alloy thin-walled tube based on internal pressure method
ZHAO Xinghua, TANG Yun, XU Yinjie, XING Lu, HE Yun
National Institute of Measurement and Testing Technology, Chengdu 610021, China
Abstract: The problems of deformation and rupture of zirconium alloy cladding tubes in nuclear power applications seriously affect the safety of nuclear power operation. In order to better evaluate the deformation performance of thin-walled tubes such as zirconium alloy cladding tubes under internal pressure, and provide reference for the design, calculation and verification of fuel assembly, a Poisson’s ratio test method based on internal pressure method was designed. According to the stress solution of the thin-walled tube under uniform internal pressure, the theoretical formula for obtaining the Poisson’s ratio of the thin-walled tube by applying internal pressure is derived. Design reasonable internal pressure test method according to the theoretical formula, this method is used to carry out Poisson’s ratio test at 20 ℃ to 400 ℃ for N36 zirconium alloy thin-walled tube, and the comparative test at corresponding temperature is carried out by tensile method. The results show that the internal pressure test method can effectively obtain the Poisson’s ratio of zirconium alloy thin-walled tube at different temperatures. And the Poisson’s ratio of zirconium alloy thin-walled tube obtained by the internal pressure test method is consistent with the results obtained by the tensile method, and the relative errors are all within 2%. At the same time, the test results show that the Poisson’s ratio of N36 zirconium alloy thin-walled tube increases with the increase of test temperature.
Keywords: internal pressure method;zirconium alloy;thin-walled tube;Poisson’s ratio
2024, 50(5):42-46,61  收稿日期: 2023-02-12;收到修改稿日期: 2023-03-27
基金项目:
作者简介: 赵兴华(1988-),男,山东泰安市人,助理研究员,硕士,研究方向为力学计量检测。
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