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Performance enhancement of sandwich panels with honeycomb–corrugation hybrid core

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Theoretical & Applied Mechanics Letters 2016年第1期6卷 54-59页

作者： Bin Han Wenbin Wang Zhijia zhang qiancheng zhang Feng Jin tianjian lu school of Mechanical Engineering Xi'anJiaotong UniversityXi'an 710049China moe key {2. for Multifunctional Materials and Structures Xi'an Jiaotong UniversityXi'an 710049China State key laboratory for Mechanical Structure {2. and {2. Xi'an Jiaotong UniversityXi'an 710049China

The concept of combining metallic honeycomb with folded thin metallic sheets （corrugation） to construct a novel core type for lightweight sandwich structures is proposed. The honeycomb-corrugation hybrid core is manufactured by filling the interstices of aluminum corrugations with precision-cut trapezoidal aluminum honeycomb blocks, bonded together using epoxy glue. The performance of such hybrid-cored sandwich panels subjected to out-of-plane compression, transverse shear, and three-point bending is investigated, both experimentally and numerically. The strength and energy absorption of the sandwich are dramatically enhanced, compared to those of a sandwich with either empty corrugation or honeycomb core. The enhancement is induced by the beneficial interaction effects of honeycomb blocks and folded panels on improved buckling resistance as well as altered crushing modes at large plastic deformation. The present approach provides an effective method to further improve the mechanical properties of conventional honeycomb-cored sandwich constructions with low relative densities.

关键词： Honeycomb-corrugation Compression Shear Bending Performance enhancement

Analytical design of effective thermal conductivity for fluid-saturated prismatic cellular metal honeycombs

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Theoretical & Applied Mechanics Letters 2016年第2期6卷 69-75页

作者： Wenbin Wang xiaohu Yang Bin Han qiancheng zhang xiangfei Wang {2. lu moe key {2. for Multifunctional Materials and Structures Xi'an Jiaotong UniversityXi'an 710049China Department of Building Environment and Energy Engineering Xi'an Jiaotong University.Xi'an 710049China school of Mechanical Engineering Xi'an fiaotong UniversityXi'an 710049.China State key laboratory for {2. and {2. of Mechanical Structures Xi'an jiaotong UniversityXi'an 710049China

A comparative optimal design of fluid-saturated prismatic cellular metal honeycombs （PCMHs） having different cell shapes is presented for thermal management applications. Based on the periodic topology of each PCMH, a unit cell （UC） for thermal transport analysis was selected to calculate its effective thermal conductivity. Without introducing any empirical coefficient, we modified and extended the analytical model of parallel-series thermal-electric network to a wider porosity range （0.7 ~ 0.98） by considering the effects of two-dimensional local heat conduction in solid ligaments inside each UC. Good agreement was achieved between analytical predictions and numerical simulations based on the method of finite volume. The concept of ligament heat conduction efficiency （LTCE） was proposed to physically explain the mechanisms underlying the effects of ligament configuration on effective thermal conductivity （ETC）. Based upon the proposed theory, a construct strategy was developed for designing the ETC by altering the equivalent interaction angle with the direction of heat flow： relatively small average interaction angle for thermal conduction and relatively large one for thermal insulation.

关键词： Effective thermal conductivityPrismatic cellular metal honeycombLigament heat conduction efficiencyAnalytical designEquivalent interaction angle

高温环境下梯度多孔金属纤维的吸声性能及优化设计

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西安交通大学学报 2018年第1期52卷 143-150页

作者：张俊陈卫华任树伟辛锋先陈天宁卢天健西安交通大学多功能材料和结构教育部重点实验室西安710049 西安交通大学机械结构强度与振动国家重点实验西安710049 兰州理工大学机电工程学院兰州730050 西安交通大学机械工程学院西安710049

为了研究高温环境下具有梯度结构的多孔金属纤维吸声性能,应用物性参数与温度之间的关系式,将Johnson-Allard吸声理论模型拓展到高温条件下,建立了多孔金属纤维材料高温吸声理论模型。采用高温阻抗管设备,测量了多孔材料试件,实验测试... 详细信息

为了研究高温环境下具有梯度结构的多孔金属纤维吸声性能,应用物性参数与温度之间的关系式,将Johnson-Allard吸声理论模型拓展到高温条件下,建立了多孔金属纤维材料高温吸声理论模型。采用高温阻抗管设备,测量了多孔材料试件,实验测试数据与理论计算结果符合很好,验证了理论模型的有效性。应用声阻抗转移公式,进一步将该理论模型拓展为梯度多孔金属纤维的高温吸声理论模型,并结合优化算法对多层梯度材料结构进行了优化设计。研究结果表明:高温条件下,材料吸声效果相比常温条件下稍差;多孔材料孔隙率和纤维丝径对材料吸声性能影响显著,随着孔隙率或纤维丝直径增大,材料吸声系数在低频段减小,在中频段增大;经过结构优化设计后,在同等条件下,多层梯度金属纤维材料吸声性能明显优于单层结构,具有良好的吸声效果。研究工作对多孔金属纤维材料的高温吸声应用及梯度优化设计具有一定的指导意义。

关键词：多孔金属纤维&弟度结构高温吸声性能

基于可靠度的耐蚀低合金钢筋腐蚀起始寿命预测

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腐蚀与防护 2019年第4期40卷 281-286页

作者：刘明程学群李晓刚卢天健西安交通大学航天航空学院多功能材料与结构教育部重点实验室西安710049 西安交通大学航天航空学院机械结构强度与振动国家重点实验室西安710049 北京科技大学新材料技术研究院腐蚀与防护中心北京100083 中国科学院宁波材料技术与工程研究所宁波315201 南京航空航天大学机械结构力学与控制国家重点实验室南京210016

通过Monte Carlo概率分析的方法,结合文献查阅,对3种自行研制且含不同铬含量的低合金耐蚀钢筋在海洋环境中的腐蚀起始寿命进行了预测,重点研究了温度对钢筋腐蚀起始寿命的影响规律。结果表明:温度的升高不仅降低了钢筋腐蚀的临界氯离子... 详细信息

通过Monte Carlo概率分析的方法,结合文献查阅,对3种自行研制且含不同铬含量的低合金耐蚀钢筋在海洋环境中的腐蚀起始寿命进行了预测,重点研究了温度对钢筋腐蚀起始寿命的影响规律。结果表明:温度的升高不仅降低了钢筋腐蚀的临界氯离子含量,也提高了混凝土中氯离子的扩散系数;采用低合金耐蚀钢筋可不同程度地延长混凝土中钢筋腐蚀起始寿命,提高钢筋混凝土结构在海洋环境中的耐久性,但针对极其苛刻的服役环境应采用更为严格的防腐蚀措施。

关键词：耐蚀钢筋寿命预测温度钢筋混凝土结构概率分析