Analysis of Glass Shell's Thermal Stress Based on Orthogonal Experiment

doi:10.3901/JME.2019.12.091

Abstract

Abstract: In order to understand the glass shell's stress of PMT applied in the Jiangmen Underground Neutrino Observation (JUNO) under temperature load to avoid glass shell breakage, the effect of different potting adhesives on the glass's thermal stress is simulated. In the orthogonal test, the material's elastic modulus, Poisson ratio and thermal expansion coefficient are selected as the research factors. The L₂₅(5³) orthogonal array is established and there are total 25 sets of numerical simulation schemes. According to the results of range analysis and variance analysis, the primary factor affecting glass's thermal stress is modulus and thermal expansion coefficient. The secondary factor is the Poisson ratio. The elastic modulus has a significant effect on the thermal stress of glass shell. The thermal expansion coefficient has a certain effect on the thermal stress of glass shell. And Poisson's ratio has no significant effect on the thermal stress of glass shell. Curve fitting for the arithmetic mean of each factor level is done and a sensitivity analysis method based on the analytic solution of fitting function is proposed to obtain the sensitive of the design index to each factor. The material modification can be carried out according to the maximum sensitivity parameter. So the selection and modification of the potting material is more pertinence and directivity The research results have great guiding significance and reference value for the practical project.

Key words: curve fitting, orthogonal test, sensitivity analysis, thermal stress, variance analysis

CLC Number:

TG156

QIAN Xiaohui, MA Xiaoyan, QIN Zhonghua, HOU Shaojing, XU Meihang, ZHANG Peng, ZHU Zian. Analysis of Glass Shell's Thermal Stress Based on Orthogonal Experiment[J]. Journal of Mechanical Engineering, 2019, 55(12): 91-98.

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