强温变高荷载下帘线-橡胶复合材料力学特性研究

The application of the cord-rubber composite material is very extensive and important, and researchers are focused on its mechanical properties, especially under the coupling of strong temperature variation and high load. In our previous study, we proposed a correction theory of cord tensile modulus based on the constant temperature assumption and established the correction theory model of the cord-rubber composite material. However, there were large differences between cords and rubber under the strong temperature variation and high load. So more factors need to be considered when researching the mechanical properties of cord-rubber composite. This project is focused on the cord-rubber composite under rapid temperature changes. We will firstly establish the thermo-hyperelastic model of rubber and the thermal correction constitutive model of cord; analyze the thermal softening and heat conduction of the composite; reveal the mechanism of its internal mechanics changes. Above all, the theory model of the cord-rubber composite material under strong coupling of force and thermal will be established; Compressive deformation instability problem of non-uniform temperature field of thin-walled spherical shell will be studied; The mechanism and variation of the shell internal stress will be revealed; The understanding of cord-rubber composite mechanical properties under the coupling of strong temperature variation and high load will reach a new level. So, this study is quite important for the development of rubber composite theoretical and experimental techniques.

帘线-橡胶复合材料有着广泛而重要的应用，其力学特性的研究已成为热点，但强温变高荷载下帘线-橡胶复合材料力学特性的研究仍有待于进一步深入。申请者在前期研究中提出了基于恒温假设的帘线拉伸模量修正理论，建立了帘线-橡胶复合材料力学特性修正理论模型，但在强温变高荷载下帘线与橡胶受热变化存在较大差异，使帘线-橡胶复合材料力学特性的研究需要考虑更多因素。本课题拟开展帘线-橡胶复合材料的强温变实验研究，建立橡胶热超弹性模型与帘线热修正本构模型，分析复合材料受热软化与热传导过程，揭示复合材料内部力学变化机理。建立帘线-橡胶复合材料强力热耦合理论模型，研究非均匀温度场中复合材料薄壁球壳的受压变形不稳定问题，揭示球壳内部应力产生机理与变化规律，深化对强温变高荷载下帘线-橡胶复合材料力学特性的认识，该研究对橡胶复合材料研究理论与实验技术发展有重要意义。

本研究主要研究强力热耦合下帘线-橡胶复合材料力学特性。为研究橡胶材料、帘线-橡胶复合材料力学性能，自主构建了准静态单轴拉伸实验系统，结合某战略武器的橡胶适配器和橡胶圆筒等典型构件研究了其应力和变形模式，探讨了其在静载条件下的力学性能与表现行为；为研究橡胶材料、帘线-橡胶复合材料的率相关动态本构模型及其力学行为，揭示帘线、橡胶及其界面之间的相互作用机理，构建了SHTB实验系统，开展了实验研究，验证了所提出的动态本构模型，数值计算结果与实验数据吻合程度高；为弥补现有研究理论的不足，提出了一种基于细观力学的帘线-橡胶复合材料率相关理论模型，为橡胶复合材料的研究提供了一种新方法；对帘线-橡胶复合材料细观力学性能和复合材料薄壁球壳大变形问题进行了研究，研究橡胶复合材料薄壁球壳大变形问题时结合某战略武器关键部件自适应橡胶底座开展，将本研究所取得的成果进行了实际应用，填补了某战略武器的关键发射部件——自适应橡胶底座研究方法的空白，对帘线-橡胶复合材料的理论研究与实际应用具有重要意义。