Characterization, Design and Modeling of Novel Shape Memory Composites

该拨款提供财政资金来设计、制造结构稳定且坚固的形状记忆复合材料并对其行为进行建模，这些复合材料可以随着温度和/或磁场恢复大的变形。新型形状记忆复合材料将由（常规和磁性）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、塑性、回复应力和应变、界面强度、阻尼和刚度等性能的影响，可以更深入地理解形状记忆复合材料的温度、应力和磁场依赖性以及可逆驱动机理。此外，一个基于细观力学的分析模型将被建立来解释和预测形状记忆复合材料的行为，然后通过所获得的实验结果进行校准。如果成功，新型复合材料，可以证明大可逆驱动与可调的功能特性，如刚度和阻尼的温度和磁场的函数将被制造。制造的复合材料可以用作高耐久性、轻质、更高强度、低成本和功能可调的复合材料，以在致动器应用中产生更有效的系统和机构。它们可以利用它们的i）自感测能力来感测环境条件（例如温度、湿度）的变化并相应地调整它们的行为; ii）具有可逆致动能力的高强度，以用作支架和药物递送系统; iii）用于振动隔离的温度和磁场依赖性阻尼特性，iv）用于结构中自愈合的力产生能力。鉴于拟议研究的跨学科性质，该项目将大大有助于研究生/本科大学生，K-12学生，高中教师和广大公众在智能材料的新兴领域的科学教育。

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.