形状记忆聚合物三维有限变形本构模型的建立与应用研究

Shape memory polymers (SMPs) have increasingly wide applications in MEMS, biomedical engineering, and aerospace field, which have become a research hotspot in the field of smart materials in recent years. This project focuses on the mechanical properties of the SMPs, in order to develop constitutive equations to model three dimensional finite deformation behaviors of SMPs, and then incorporate this model into commercial finite element software for engineering applications. Within the thermodynamic framework, a new physical quantity is defined to describe the transformation relationship between the active phase and frozen phase, which can consider the influence of the temperature rate. The three-dimensional finite deformation constitutive model of SMPs can be established from the two phase model after modified by the new physical quantity. Thereafter, A secondary development is applied to incorporate the developed constitutive equations into commercial finite element software ABAQUS, in order to establish a stable and efficient numerical analysis method. Finally, we intend to explore potential applications of SMPs with the developed constitutive equations. Based on our recent work studying the surface instability of hard bilayer-soft substrate system, the numerical simulations combined with experiments are used to explore the potential applications in intelligent controls of surface patterns. This study is expected to make the strength check of structures containing SMPs conveniently, and to provides new methods of exploring their potential applications.

形状记忆聚合物在微机械、医疗、航天航空等领域得到日益广泛的应用，近年来已成为智能材料研究领域的热点。本研究重点关注形状记忆聚合物材料的力学性能，旨在建立三维有限变形本构模型并植入到商用有限元软件中便于工程应用。首先，本研究拟在热力学框架内，基于现有的两相模型，考虑温度变化率等因素的影响，定义新的可清晰反映活跃相和冻结相间转化关系的物理量，建立形状记忆聚合物材料的三维有限变形本构模型。在此基础上，拟通过二次开发将本构方程嵌入到商用有限元软件ABAQUS中，建立稳定和高效的数值分析方法。最后，拟将发展得到的本构关系用于拓展形状记忆聚合物材料的应用。基于双层膜-软基底系统表面失稳的研究结果，拟通过数值模拟并结合相应的实验，研究形状记忆聚合物在表面形貌智能调控方面的潜在应用。本研究工作有望为设计和校核含形状记忆聚合物材料的工程结构带来便利，同时有望为开发形状记忆聚合物的潜在应用提供新的手段。

形状记忆聚合物在微机械、医疗、航天航空等领域得到日益广泛的应用，近年来已成为智能材料研究领域的热点。本研究重点关注形状记忆聚合物材料的力学性能，旨在建立三维有限变形本构模型并植入到商用有限元软件中便于工程应用。首先，基于粘弹性本构模型并考虑形状记忆聚合物材料的变温特性，建立了形状记忆聚合物材料的三维有限变形本构模型。进而，通过二次开发将本构方程嵌入到商用有限元软件ABAQUS中，建立了稳定和高效的数值分析方法。最终，将发展得到的本构关系用于拓展形状记忆聚合物材料的应用。本项目选择两类主要结构，包括硬膜-SMPs基底、表面硬膜-中间软层-SMPs基底结构，通过数值模拟并结合相应的实验，研究了形状记忆聚合物在表面形貌智能调控方面的潜在应用。本研究工作有望为设计和校核含形状记忆聚合物材料的工程结构带来便利，同时有望为开发形状记忆聚合物的潜在应用提供新的手段。