Mechanical research and development of a monocrystallinesilicon neutron beam window for CSNS

ZHOU Liang; QU Hua-Min

doi:10.1088/1674-1137/39/9/096001

Chinese Physics C> 2015, Vol. 39> Issue(9) : 096001 DOI: 10.1088/1674-1137/39/9/096001

Mechanical research and development of a monocrystallinesilicon neutron beam window for CSNS

ZHOU Liang ^, ,
QU Hua-Min ^,

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Abstract：
The monocrystalline silicon neutron beam window is one of the key components of a neutron spectrometer. Monocrystalline silicon is brittle and its strength is generally described by a Weibull distribution due to the material inhomogeneity. The window is designed not simply according to the mean strength but also according to the survival rate. The total stress of the window is stress-linearized into a combination of membrane stress and bending stress by finite element analysis. The window is a thin circular plate, so bending deformation is the main cause of failure and tensile deformation is secondary and negligible. Based on the Weibull distribution of bending strength of monocrystalline silicon, the optimized neutron beam window is designed to be 1.5 mm thick. Its survival rate is 0.9994 and its transmittance is 0.98447, which meets both physical and mechanical requirements.

References

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WANG F W, LIANG T J et al. Science China: Physics, Mechanics Astronomy, 2013, 12: 2410-2424[2] GAO Y F. Study on Electroplated Diamond Wire Saw Slicing Single Crystal Silicon Technology and Mechanism (Ph. D. Thesis). Jinan: Shandong University, 2009 (in Chinese). 15-16[3] JIN Z Z, BAO Y W. Characterization of Mechanical Properties for Brittle Materials and Ceramics. second edition. Beijing: Chinese Railway Publishing House, 1996. 90-93[4] XIE S Y, SHI Z Y. GB/T 15615-1995: Test method for measuring flexure strength of silicon slices. Beijing: Chinese Standard Press, 1996. 694-700[5] JIN Z Z, MA J R. Journal of the Chinese Ceramic Society, 1989, 17(3): 229-236[6] WANG X M, Mike W Z. Design and Calculation of Engineering Pressure Vessel. Beijing: National Defense Industry Press, 2011. 83-88

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ZHOU Liang and QU Hua-Min. Mechanical research and development of a monocrystallinesilicon neutron beam window for CSNS[J]. Chinese Physics C, 2015, 39(9): 096001. doi: 10.1088/1674-1137/39/9/096001

ZHOU Liang and QU Hua-Min. Mechanical research and development of a monocrystallinesilicon neutron beam window for CSNS[J]. Chinese Physics C, 2015, 39(9): 096001. doi: 10.1088/1674-1137/39/9/096001 shu

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Received: 2014-11-24
Revised: 2015-04-27

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沈阳化工大学材料科学与工程学院沈阳 110142

Mechanical research and development of a monocrystallinesilicon neutron beam window for CSNS

ZHOU Liang ^,
QU Hua-Min ^,

Corresponding author: ZHOU Liang,

Corresponding author: QU Hua-Min,

Received Date: 2014-11-24
Accepted Date: 2015-04-27
Available Online: 2015-09-05

Abstract: The monocrystalline silicon neutron beam window is one of the key components of a neutron spectrometer. Monocrystalline silicon is brittle and its strength is generally described by a Weibull distribution due to the material inhomogeneity. The window is designed not simply according to the mean strength but also according to the survival rate. The total stress of the window is stress-linearized into a combination of membrane stress and bending stress by finite element analysis. The window is a thin circular plate, so bending deformation is the main cause of failure and tensile deformation is secondary and negligible. Based on the Weibull distribution of bending strength of monocrystalline silicon, the optimized neutron beam window is designed to be 1.5 mm thick. Its survival rate is 0.9994 and its transmittance is 0.98447, which meets both physical and mechanical requirements.