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Shape memory polymers as actuators: Characterization of the relevant parameters under constrained recovery
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-08-18 , DOI: 10.1002/pen.25778 Carina Peixoto, Andrea Zille, Alexandre Ferreira da Silva, Olga Sousa Carneiro
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-08-18 , DOI: 10.1002/pen.25778 Carina Peixoto, Andrea Zille, Alexandre Ferreira da Silva, Olga Sousa Carneiro
In this work, a shape memory polyurethane is characterized through constrained recovery experiments performed in a tensile testing equipment. The most relevant results obtained are those concerned with the stress released over time during the recovery stage, since they provide quantitative information that can be used in the design of actuators. For this sake, design guidelines are proposed based on the effect of: (i) the programming temperature; (ii) the deformation imposed during the programming stage; (iii) the recovery temperature; and (iv) the manufacturing process used to produce the samples tested (compression molding and Fused Filament Fabrication). The set of experiments performed with compression-molded samples put in evidence a considerable variety of material responses: (i) the maximum released stress varied from 0.74 to 1.68 MPa; (ii) the time required to attain this stress varied from 47 to 600 s; and (iii) the stress was released as a peak value that relaxed rapidly, or, contrarily, had a lasting effect. Another relevant conclusion is that the 3D printing technique does not affect the shape memory behavior of the material. Having this in mind, the conclusions provided by the compression-molded samples study can be extended to printed ones.
中文翻译:
作为致动器的形状记忆聚合物:在受限恢复下表征相关参数
在这项工作中,形状记忆聚氨酯通过在拉伸测试设备中进行的受限恢复实验进行表征。获得的最相关结果是那些与恢复阶段随时间释放的应力有关的结果,因为它们提供了可用于执行器设计的定量信息。为此,提出了基于以下影响的设计指南:(i) 编程温度;(ii) 在编程阶段施加的变形;(iii) 恢复温度;(iv) 用于生产测试样品的制造工艺(压缩成型和熔丝制造)。用压缩成型样品进行的一组实验证明了相当多的材料响应:(i) 最大释放应力从 0.74 到 1.68 MPa 不等;(ii) 达到该应力所需的时间从 47 秒到 600 秒不等;(iii) 压力作为峰值释放,迅速放松,或者相反,具有持久的影响。另一个相关结论是 3D 打印技术不会影响材料的形状记忆行为。考虑到这一点,压缩成型样品研究提供的结论可以扩展到印刷样品。
更新日期:2021-10-01
中文翻译:
作为致动器的形状记忆聚合物:在受限恢复下表征相关参数
在这项工作中,形状记忆聚氨酯通过在拉伸测试设备中进行的受限恢复实验进行表征。获得的最相关结果是那些与恢复阶段随时间释放的应力有关的结果,因为它们提供了可用于执行器设计的定量信息。为此,提出了基于以下影响的设计指南:(i) 编程温度;(ii) 在编程阶段施加的变形;(iii) 恢复温度;(iv) 用于生产测试样品的制造工艺(压缩成型和熔丝制造)。用压缩成型样品进行的一组实验证明了相当多的材料响应:(i) 最大释放应力从 0.74 到 1.68 MPa 不等;(ii) 达到该应力所需的时间从 47 秒到 600 秒不等;(iii) 压力作为峰值释放,迅速放松,或者相反,具有持久的影响。另一个相关结论是 3D 打印技术不会影响材料的形状记忆行为。考虑到这一点,压缩成型样品研究提供的结论可以扩展到印刷样品。