Characterization, Design and Modeling of Novel Shape Memory Composites

该基金为设计、制造和模拟结构稳定、强形状记忆复合材料的行为提供资金，这些复合材料可以在温度和/或磁场下恢复大变形。新型形状记忆复合材料将由（传统和磁性）形状记忆合金和形状记忆聚合物组成。通过系统地研究预应变、混合比、表面光洁度、体积比、合金尺寸和形状对形状记忆复合材料的强度、延展性、恢复应力和应变、界面强度、阻尼和刚度等性能的影响，可以更深入地了解形状记忆复合材料的温度、应力和磁场依赖特性和可逆驱动机制。此外，还将建立一个基于微观力学的分析模型来解释和预测形状记忆复合材料的行为，然后通过获得的实验结果进行校准。如果成功，新型复合材料将被制造出来，这种复合材料可以展示出大的可逆驱动，并具有可调的功能特性，如刚度和阻尼，作为温度和磁场的函数。制造复合材料可以作为高耐久性、轻量化、高强度、低成本和功能可调的复合材料，在执行器应用中产生更高效的系统和机构。它们可以利用它们的自我感知能力来感知环境条件（例如温度、湿度）的变化，并相应地调整它们的行为；Ii)高强度，具有可逆驱动能力，可用于支架和药物输送系统；Iii)用于隔振的温度和磁场相关阻尼特性，iv)用于结构自愈的力生成能力。鉴于拟议研究的跨学科性质，该项目将对新兴智能材料领域的研究生/本科生，K-12学生，高中教师和广大公众的科学教育做出重大贡献。

This grant provides financial funding to design, fabricate and model the behavior of structurally stable and strong shape memory composites that could recover large deformations with temperature and/or magnetic field. Novel shape memory composites will be composed of (conventional and magnetic) shape memory alloys and shape memory polymers. A deeper understanding of temperature, stress and magnetic field-dependent properties and reversible actuation mechanisms of shape memory composites will be attained by systematic investigations of the effects of pre-straining, mixture ratio, surface finish, volume ratio, size and shape of alloys on the strength, ductility, recovery stress and strain, interfacial strength, damping and stiffness properties of shape memory composites. Moreover, a micromechanics-based analytical model will be founded to explain and predict the behavior of shape memory composites and then calibrated through the achieved experimental findings. If successful, novel composites that could demonstrate large reversible actuation with tunable functional properties such as stiffness and damping as functions of temperature and magnetic field will be fabricated. Fabricated composites can be employed as high endurance, lightweight, higher strength, low cost and functionally tunable composites to result in more efficient systems and mechanisms in actuator applications. They can utilize their i) self-sensing ability to sense the changes in environmental conditions (e.g. temperature, humidity) and adapt their behavior accordingly; ii) high strength with reversible actuation capability to be used as stents and drug delivery systems; iii) temperature and magnetic field dependent damping properties for vibration isolation, iv) force generation capability for self-healing in structures. Given the interdisciplinary nature of the proposed research, this project will contribute significantly to the scientific education of graduate/undergraduate university students, K-12 students, high school teachers and the public at large in the emerging field of intelligent materials.