Storage Reliability Modeling of Polyurethane Seals for Electrical Connectors

doi:10.3901/JME.2024.20.361

Abstract

Abstract: On the issue of reliability assessment of electrical connectors for missiles in long-term storage environments. Failure analysis of polyurethane adhesive seals for electrical connectors in a storage environment. The polyurethane adhesive seal failure is identified as a seal leak caused by a combination of cohesive failure and boundary failure. The degradation mechanism of polyurethane adhesive in storage environment is the oxidation and hydrolysis of large molecular groups inside the polyurethane adhesive caused by temperature and humidity. Based on Newton's law of viscosity and Roth seal theory, a mathematical expression for gas leakage combining cohesive failure and boundary damage is established. Based on molecular dynamics and the law of mass action, the mathematical relationship between the performance degradation rate of polyurethane sealant and temperature and humidity is established. To establish the performance degradation trajectory of polyurethane adhesive seals for electrical connectors containing temperature and humidity, using the gas leakage rate of the adhesive seals as the performance index. Combined with the central limit theorem, a statistical model for the storage reliability of polyurethane adhesive seals is developed, it can provide a theoretical basis for evaluating the sealing reliability of polyurethane adhesive for electrical connectors in storage environments.

Key words: electrical connector, seal failure, polyurethane adhesive, reliability modeling

CLC Number:

TB114

QIAN Ping, LIU Xinyu, CHEN Wenhua, WANG Zhe, GUO Mingda. Storage Reliability Modeling of Polyurethane Seals for Electrical Connectors[J]. Journal of Mechanical Engineering, 2024, 60(20): 361-371.

References

[1] LUO Y，WANG G，CAI M，et al. Research on contact performance of aviation electrical connector under atmospheric turbulence[J]. IEICE Transactions on Electronics，2021，104(3)：112-120.
[2] 王世娇，陈文华，钱萍，等. 航天电连接器的可靠性设计建模[J]. 机械工程学报，2017，53(10)：180-186. WANG Shijiao，CHEN Wenhua，QIAN Ping，et al. Reliability design modeling of aerospace electrical connector[J]. Journal of Mechanical Engineering，2017，53(10)：180-186.
[3] HAMMAM T，KASSMAN-RUDOLPHI A，LUNDSTROM P. Vibration-induced deterioration of tin-coated connectors studied by using a force controlled fretting bench-test[C]//Proceedings of the Fifty-First IEEE Holm Conference on Electrical Contacts. Chicago：IEEE，2005：97-106.
[4] 潘骏，张雯，张利彬，等. 电连接器接触件振动可靠性试验评估[J]. 机械工程学报，2021，57(10)：257-266. PAN Jun，ZHANG Wen，ZHANG Libin，et al. Vibration reliability test assessment of electrical connector contacts[J]. Journal of Mechanical Engineering，2021，57(10)：257-266.
[5] LING S，XU L，LI D，et al. Research on Composite Fretting Behavior of Au-Plated Copper Wire Spring Contacts Used in Electrical Connectors[C]//2019 IEEE Holm Conference on Electrical Contacts. Milwaukee：IEEE，2019：211-217.
[6] MEYYAPPAN K，MCALLISTER A，VASUDEVAN V，et al. Impact of corrosive environment on contact resistance of infrequently mated connectors[C]//2015 IEEE 61st Holm Conference on Electrical Contacts (Holm). San Diego：IEEE，2015：317-323.
[7] REN W，DU D，DU Y. Electrical contact resistance of connector response to mechanical vibration environment[J]. IEEE Transactions on Components，Packaging and Manufacturing Technology，2019，10(2)：212-219.
[8] 陈文华，高亮，李星军，等. 航天电连接器绝缘电阻随真空度和温度变化规律的研究[J]. 中国机械工程，2011，22(22)：2727-2732. CHEN Wenhua，GAO Liang，LI Xingjun，et al. Insulation resistance variation with vacuum and temperature for aerospace electrical connectors[J]. China Mechanical Engineering，2011，22(22)：2727-2732.
[9] ZHANG X，LI K，XU J. The research of insulation failure on signals transmission in electrical connector[C]//2011 Second International Conference on Mechanic Automation and Control Engineering. Hohhot：IEEE，2011，1797-1799.
[10] 崔洁，周三三，朱建军. 装配工艺对矩形电连接器在高湿环境下可靠性的影响[J]. 电子机械工程，2015，31(5)：42-44. CUI Jie，ZHOU Sansan，ZHU Jianjun. Effect of assembly process on reliability of rectangular electrical connector in humid conditions[J]. Electromechanical Engineering，2015，31(5)：42-44.
[11] 陈佳. 空间环境条件下绝缘材料聚醚酰亚胺(PEI)绝缘电阻模型研究[D]. 武汉：华中科技大学，2011. CHEN Jia. Study on insulation resistance model of polyetherimide (PEI) insulation material under space environment[D]. Wuhan：Huazhong University of Science and Technology，2011.
[12] SAWA T，TENMA K，KOBAYASHI T，et al. Finite element method stress analysis and evaluation of the sealing performance in box-shape flange gasketed connections subjected to internal pressure[J]. Journal of Pressure Vessel Technology，2017，139(5)：1-22.
[13] LUTKIEWICZ P，ROBERTSON D，PULVINO M. Establishment of industry standard flange sealing effectiveness measure (leakage rate based) methodology[C]// Pressure Vessels and Piping Conference. San Antonio：American Society of Mechanical Engineers，2019：106-114.
[14] MADAZHY R，MATHEWS S，HOWARD E. Analysis of contact pressure distribution on 3-bolt self-energized connector seals[C]//ASME Pressure Vessels and Piping Conference. Prague：Pressure Vessels and Piping，2009： 71-79.
[15] 王莉，顾晓辉，潘守华. 某O型密封圈的双参数加速退化规律分析[J]. 装备环境工程，2019，16(11)：84-89. WANG Li，GU Xiaohui，PAN Shouhua. Regular pattern of the O-ring’s two-parameter accelerated degradation[J]. Equipment Environmental Engineering，2019，16(11)：84-89.
[16] 王欢，向宇，黄乐. 一种静密封寿命评估方法[J]. 润滑与密封，2019，44(5)：134-141. WANG Huan，XIANG Yu，HUANG Le. An assessment method of static seal life[J]. Lubrication and Sealing，2019，44(5)：134-141.
[17] 肖坤，顾晓辉，彭琛. 基于恒定应力加速退化试验的某引信用O型橡胶密封圈可靠性评估[J]. 机械工程学报，2014，50(16)：62-69. XIAO Kun，GU Xiaohui，PENG Chen. Reliability evaluation of the O-type rubber sealing ring for fuse based on constant stress accelerated degradation testing[J]. Journal of Mechanical Engineering，2014，50(16)：62-69.
[18] 杨奋为. 航天用电连接器的可靠性研究[J]. 上海航天，1997(1)：35-39，64. YANG Fenwei. Research on the reliability of electrical connectors for aerospace[J]. Shanghai Aerospace，1997(1)：35-39，64.
[19] 刘凉冰. 聚氨酯的化学降解及其性能[J]. 聚氨酯工业，2001(2)：5-8. LIU Liangbing. Chemical degradation and properties of polyurethane[J]. Polyurethane Industry，2001(2)：5-8.
[20] SURENDER R，MAHENDRAN A R，WUZELLA G，et al. Synthesis，characterization and degradation behavior of thermoplastic polyurethane from hydroxylated hemp seed oil[J]. Journal of Thermal Analysis and Calorimetry，2016，123：525-533.
[21] 曹春莉. 聚氨酯基单组份密封胶粘剂固化行为、性能评价体系及泡沫材料的制备研究[D]. 北京：北京化工大学，2010. CAO Chunli. Evaluation of curing behavior，properties of polyurethane one-component adhesives and preparation of polyurethane foam[D]. Beijing：Beijing University of Chemical Technology，2010.
[22] 向阳阳，徐应锋，李谋吉，等. 疏水改性的聚对二甲苯薄膜对聚氨酯泡沫阻湿性能的影响[J]. 中国表面工程，2023，36(3)：52-64. XIANG Yangyang，XU Yingfeng，LI Mouji，et al. Effect of hydrophobic modification of parylene-c film on moisture barrier of polyurethane foam[J]. China Surface Engineering，2023，36(3)：52-64.
[23] TAKAHARA A，COURY A J，HERGENROTHER R W，et al. Effect of soft segment chemistry on the biostability of segmented polyurethanes. I. In vitro oxidation[J]. Journal of Biomedical Materials Research，1991，25(3)：341-356.
[24] 刘景军，李效玉. 高分子材料的环境行为与老化机理研究进展[J]. 高分子通报，2005(3)：62-69. LIU Jingjun，LI Xiaoyu. Research progress on environmental behavior and aging mechanism of polymer materials[J]. Polymer Bulletin，2005(3)：62-69.
[25] 钱欣，郑荣华，蔡鹏. 聚丙烯的热氧老化及其影响因素[J]. 浙江工业大学学报，2002(5)：69-74. QIAN Xin，ZHENG Ronghua，CAI Peng. Thermal oxidative ageing and thermal stabilization of polypropylene[J]. Journal of Zhejiang University of Technology，2002(5)：69-74.
[26] 陈家照，黄闽翔，王学仁. 固体火箭发动机长期贮存下橡胶O形圈泄漏分析[J]. 润滑与密封，2016，41(2)：76-80. CHEN Jiazhao，HUANG Minxiang，WANG Xueren. Leakage analysis on rubber O-ring of solid rocket motor under long-term storage[J]. Lubrication and Sealing，2016，41(2)：76-80.
[27] 杜秋华，杜海深，巫宗萍，等. 分子流状态平面密封结构漏率预估[J]. 真空，2012，49(1)：36-38. DU Qiuhua，DU Haishen，WU Zongping，et al. Leakage rate estimate of the plane sealing structure under the state of molecular flow[J]. Vacuum，2012，49(1)：36-38.
[28] 钱梦騄，王浩. 粘接界面的氢键模型与弹簧边界条件[C]//中国声学学会2006年全国声学学术会议论文集. 厦门：《声学技术》编辑部，2006：193-194. QIAN Mengxuan，WANG Hao. Hydrogen bond model and spring boundary conditions of adhesive interface[C]//Proceedings of the 2006 National Acoustics Academic Conference of the Chinese Acoustic Society. Xiamen：Editorial Department of Acoustic Technology，2006：193-194.
[29] SU X，XU W，CHEN W，et al. Fractional creep and relaxation models of viscoelastic materials via a non-Newtonian time-varying viscosity：Physical interpretation[J]. Mechanics of Materials，2020，140：103222.