Lattice-based shape memory and superelastic structures: design, manufacture, modeling, and applications

基于晶格的形状记忆和超弹性结构：设计、制造、建模和应用

• 批准号: RGPIN-2019-04088
• 负责人: Brailovski, Vladimir
• 金额: $ 1.97万
• 依托单位: École de technologie supérieure
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=681885
• 关键词: Lattice; based; shape; memory; superelastic

The proposed research program bridges the fields of science, technology and mechanics of materials with the objective of creating multifunctional shape memory and superelastic components for aerospace and medical applications.******To this end, two types of shape memory alloys (SMA) will be used: titanium-nickel alloy (Ti-Ni) and near-beta titanium alloy (Ti-Nb-Zr). They will be processed using laser powder bed fusion (LPBF) technology to manufacture engineered lattice structures for medical and aerospace applications. In medicine, single piece highly-biocompatible Ti-Nb-Zr superelastic implants with controlled porosity gradient could reduce the risks of complications related to the implant integration problems. In aerospace, lightweight Ti-Ni shape memory structures could be used for sensing and actuation purposes. ******The program starts from the production of entirely-dense components from each of the selected alloys. To this end, the LPBF processing parameters will be optimized using a combination of the melt pool modeling and the design of experiment approaches. The best functional properties, which can be reached with the entirely-dense printed alloys, will serve as benchmarks during the design, manufacture and post-treatment of lattice-contained structures made from these materials. ******To generate variable porosity lattice structures, the design space will be populated with diamond and octahedron unit cells using an original voxel-based algorithm. Next, these structures will be produced using the LPBF technology and subjected to static and fatigue mechanical testing at different temperatures in order to establish scaling relations between the functional properties of cellular structures and their bulk material equivalents. ******To avoid the trial-and-error approach when optimizing these structures, their superelastic and shape memory behavior will be simulated using a multi-scale numerical modeling approach. Experimental validation of the developed model will be carried out by comparing the numerical results with experimental observations using optical digital imaging and X-ray computed tomography techniques. ***Finally, two pilot components will be designed, additively-manufactured and tested: a superelastic variable-porosity cervical implant made of Ti-Zr-Nb alloy and a lightweight shape memory actuator made of Ti-Ni alloy.******The results of this research program, aimed at the combination of freeform capacity of additive manufacturing with functionality of shape memory and superelastic materials will promote successful application of new-generation multifunctional lightweight structures in medicine and aerospace. The proposed program will also contribute to the training of highly qualified personnel and attract top-level foreign students to Canada. **

拟议的研究计划桥接了材料的科学，技术和力学领域，目的是为航空航天和医疗应用创建多功能形状的记忆和超弹性组件。它们将使用激光粉床融合（LPBF）技术进行处理，以制造用于医疗和航空航天应用的工程晶格结构。在医学中，具有受控孔隙率梯度的单一碎片高兼容Ti-NB-ZR超弹性植入物可以降低与植入物整合问题有关的并发症的风险。在航空航天中，轻巧的Ti-Ni形状记忆结构可用于感应和驱动目的。 ******该程序从每种选定合金的完全密集的组件的生产开始。为此，将使用熔体池建模和实验方法设计的组合来优化LPBF处理参数。可以通过完全致密的印刷合金达到的最佳功能性能将在设计，制造和处理后用这些材料制成的含有晶格的结构的设计，制造和处理后作为基准。 ******为了生成可变的孔隙率晶格结构，设计空间将使用原始的基于Voxel的算法填充钻石和八面体单位细胞。接下来，将使用LPBF技术生产这些结构，并在不同温度下进行静态和疲劳机械测试，以建立细胞结构的功能性能与其块状材料当量之间的缩放关系。 ******为了避免在优化这些结构时试用的方法，将使用多规模的数值建模方法模拟它们的超弹性和形状记忆行为。通过将数值结果与使用光学数字成像和X射线计算机断层扫描技术进行比较的实验观察结果进行比较，将对开发的模型进行实验验证。 ***最终，将设计，增添制造和测试的两个试验组件：由Ti-ZR-NB合金制成的超弹性孔隙式颈部植入物和由Ti-ni合金制成的轻巧的记忆执行器。******************这项研究的结果，旨在促进材料和超级制造能力的新型制造能力和超级超级功能的功能。医学和航空航天中的轻量级结构。拟议的计划还将为培训高素质的人员培训，并吸引高级外国学生进入加拿大。 **