椭圆柔性铰链疲劳失效分析与寿命预测

针对柔顺机构中柔性铰链受到交变对称循环载荷的作用下，使柔性铰链最薄弱处容易产生应力集中，导致柔性铰链疲劳失效问题，以柔顺机构中椭圆型柔性铰链为研究对象，以材料力学中纯弯曲理论为基础，推导椭圆柔性铰链切口处最大集中应力计算公式；利用ANSYS仿真分析，对比验证了计算公式的准确性与可行性；在此基础上，通过引入线性回归方法，建立椭圆型柔性铰链寿命预测模型，既可以预测椭圆型柔性铰链的疲劳寿命，也可以解决疲劳失效问题。通过实例验证了该模型的正确性与有效性，可为其他类型柔性铰链的疲劳失效与寿命预测提供重要参考

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies