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开发了橡胶基增强型热致形状记忆复合材料体系PE-NBR,评价了其性能并与传统形状记忆聚合物进行对比,建立了适用于该体系的本构模型,采用该体系制作了封隔器胶筒并进行了数值模拟和实验研究。将聚烯烃作为形状记忆相,填充有增强颗粒的橡胶弹性体作为改性增强相,制成具有形状记忆效应的功能性复合材料体系。体系拉伸强度达14.3 MPa,硬度达71,形状恢复率95%,优于传统形状记忆聚合物。体系中聚烯烃比例在20%~90%可调,弹性体比例在10%~70%可调。建立了基于细观力学、兼顾材料宏观性能的橡塑共混体系本构模型,可满足大变形、温度相关、非线性复合材料的分析要求。基于PE-NBR体系的形状记忆封隔器胶筒稳定承压不低于10 MPa,接触压力最大值出现在距胶筒端面约60 mm处,可满足应用要求。
The rubber-based reinforced thermosensitive shape memory composite system PE-NBR was developed. Its performance was evaluated and compared with that of the traditional shape memory polymer. A constitutive model suitable for the system was established. The system was used to make packer Rubber tube and numerical simulation and experimental study. Using polyolefin as shape memory phase and rubber particles filled with reinforcing particles as modified reinforcing phase, a functional composite system with shape memory effect was made. System tensile strength of 14.3 MPa, hardness of 71, the shape recovery rate of 95%, better than the traditional shape memory polymers. The proportion of polyolefin in the system is adjustable from 20% to 90% and the proportion of elastomer is adjustable from 10% to 70%. The constitutive model of rubber-plastic blends based on meso-mechanics and macroscopic properties was established to meet the requirements of large deformation, temperature-dependent and nonlinear composite materials. Based on the PE-NBR system, the shape-memory packer rubber cylinder has a stable pressure of no less than 10 MPa and the maximum contact pressure occurs about 60 mm from the end of the rubber cylinder to meet the application requirements.