环境因素影响下金属面夹芯板力学性能研究

发布时间：2018-07-04 16:11

本文选题：金属面夹芯板 + 环境影响因素　；参考：《哈尔滨工业大学》2013年硕士论文

【摘要】：随着世界工业化的不断发展，金属面夹芯板的应用范围变得越来越广泛，包括建筑墙面板、屋面板和飞机与轮船的重要板件。其优越的轻质，高强度，安全可靠性能得到了人们的广泛认可。在上个世纪五十年代，金属面夹芯板仅用于航空航天领域，自上世纪七十年代以来，金属面夹芯板就已经开始应用于国外的建筑工程，我国自改革开放以来，金属面夹芯板的应用也逐渐增多。在金属面夹芯板正常使用中，其力学性能往往受外界环境因素的影响，包括温度、湿度、阳光辐射、化学与生物作用等。国内外学者已对金属面夹芯板的各项力学性能做过大量研究，，但对环境因素影响下的金属面夹芯板力学性能研究还存在诸多不足。本文根据国外相关试验数据和国内实际工程，对金属面夹芯板在时间，温度，湿度，阳光辐射影响下的力学性能进行研究。本文利用能量法推导金属面夹芯板抗弯承载力公式（皱曲强度公式），在考虑芯材弹性模量随芯材厚度变化的情况下，建立抗弯承载力和芯材垫层应力（芯材抗拉与抗压强度）的关系，根据国外对金属面夹芯板的试验数据，分析在长期环境作用下夹芯板抗拉强度变化的机理与规律，结合推导所得金属面夹芯板的抗弯承载力与芯材抗拉强度的关系式，将长期环境因素的影响考虑到金属面夹芯板抗弯承载力中，并通过试验数据验证该公式的可靠性，该公式比现行金属面夹芯板规范更全面与安全的考虑环境因素与时间的影响，并为分析金属面夹芯板发生皱曲时的跨中挠度与外表面控制温度提供理论。结合实际工程中金属面夹芯板的破坏情况，对金属面夹芯板承受短期环境因素作用进行试验研究，根据工程特点，在试验中模拟工程中端部约束作用，分析在环境因素与端部约束共同作用下金属面夹芯板的力学性能。推导与模拟在短期环境因素作用下，金属面夹芯板板面应力与跨中挠度的计算公式，求解金属面夹芯板发生皱曲时的跨中挠度与板面控制温度公式，从而能更加贴合实际的分析使用过程中金属面夹芯板的力学性能，对存在破坏危险的板件及时采取措施。
[Abstract]:With the development of world industrialization, the application of metal sandwich panels has become more and more extensive, including building wall panels, roof panels and important panels for aircraft and ships. Its superior lightweight, high strength, safe and reliable performance has been widely recognized. In the 1950s, metal sandwich panels were only used in the field of aerospace. Since the 1970s, metal sandwich panels have been used in construction projects abroad. The application of metal sandwich panel is also increasing. In the normal use of metal sandwich panels, their mechanical properties are often affected by external environmental factors, including temperature, humidity, sunlight radiation, chemical and biological effects and so on. Scholars at home and abroad have done a lot of research on the mechanical properties of metal sandwich panels, but there are still many deficiencies in the study of mechanical properties of metal sandwich panels under the influence of environmental factors. In this paper, the mechanical properties of metal sandwich panels under the influence of time, temperature, humidity and sunlight radiation are studied according to the relevant test data and practical projects at home and abroad. In this paper, the formula of flexural strength (wrinkle strength formula) of metal sandwich panel is derived by energy method. When the elastic modulus of core material changes with the thickness of core material, The relationship between flexural bearing capacity and core cushion stress (core tensile strength and compressive strength) is established. Based on the experimental data of metal sandwich panel in foreign countries, the mechanism and law of the change of tensile strength of sandwich panel under long-term environment are analyzed. Combined with the relationship between the bending capacity of metal sandwich panel and the tensile strength of core material, the long-term environmental factors are taken into account in the bending bearing capacity of metal sandwich panel, and the reliability of the formula is verified by experimental data. The formula considers the influence of environmental factors and time more comprehensively and safely than the current standard of metal sandwich panel, and provides a theory for analyzing the midspan deflection and outer surface control temperature of metal sandwich panel when wrinkling occurs. Combined with the failure situation of metal sandwich panel in actual engineering, the effect of short term environmental factors on metal sandwich panel is studied experimentally. According to the characteristics of the project, the end restraint effect is simulated in the test. The mechanical properties of metal sandwich panel under the action of environmental factors and end constraints are analyzed. Under the action of short-term environmental factors, the calculation formulas of stress and midspan deflection of metal sandwich panel are deduced and simulated, and the formula of midspan deflection and control temperature of metal sandwich panel when wrinkling occurs is solved. Therefore, the mechanical properties of the metal sandwich panel can be analyzed more closely with the actual situation, and timely measures can be taken to deal with the damage danger of the metal sandwich panel.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU39

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