Comparative Analysis of Bend Dominated and Stretch Dominated Titanium Lattice Structures

部落学院和大学计划（TCUP）的一个目标是提高为美国土著学生服务的特定高等教育机构的科学、技术、工程和数学（STEM）教学和研究能力。在这些机构扩大STEM课程的范围，可以扩大学生在STEM领域追求具有挑战性、回报丰厚的职业的机会，为可能具有文化意义的领域提供研究，并鼓励社区和世代对科学和数学教育的欣赏。该项目直接符合这一目标，而且将增加对钛选择性激光熔化制造的夹层梁部件材料特性的知识体系。纳瓦霍技术大学（NTU）将研究两种不同设计的数据及其含义，并为比较其他夹层梁设计奠定基础，从而设计出最佳的强度-重量比。该研究将探索两种结构，拉伸主导（桁架型晶格单元）和弯曲主导（十二面体型晶格单元）梁结构，使用简单的支持弯曲实验。该研究将探索使用现成的分析软件创建和模拟测试样品的3D计算机模型。南洋理工大学将与劳伦斯利弗莫尔国家实验室（LLNL）合作，包括但不限于指导适当的测试结构设计和测试过程数据收集。测试的另一个方面将使用高速摄像系统来获得力、力矢量和过程中的白光扫描的全视图分析。该项目还采用了最先进的技术来捕获实时力数据，从而绘制相应的图，这将为测试数据提供更广泛的解释。比较在两台不同机器上制作的具有不同表面处理的试样，可以证明对试样抗弯曲力能力的影响。

A goal of the Tribal Colleges and Universities Program (TCUP) is to increase the science, technology, engineering and mathematics (STEM) instructional and research capacities of specific institutions of higher education that serve the Nation's indigenous students. Expanding the STEM curricular offerings at these institutions expands the opportunities of their students to pursue challenging, rewarding careers in STEM fields, provides for research studies in areas that may be culturally significant, and encourages a community and generational appreciation for science and mathematics education. This project aligns directly with that goal, and moreover will increase the body of knowledge on the material properties of sandwich beam parts created by selective laser melting using titanium.Navajo Technical University (NTU) will examine data from two different designs and their meanings and lay the groundwork for comparing other sandwich beam designs, thereby leading to designs for optimum strength-to-weight ratio. The research will explore two constructs, stretch-dominated (truss-type lattice cells) and bend-dominated (dodecahedron-type lattice cells) beam structures, using simple supported bending experiments. The research will explore creating and simulating 3D computer models of the test specimens using off-the-shelf analysis software. NTU will collaborate with Lawrence Livermore National Laboratory (LLNL), which will include but not be limited to guiding appropriate structure designs for testing and testing process data collection. Another aspect of testing will use a high-speed camera system to gain full view analysis of the forces, force vectors and in-process white light scanning.The project also uses cutting edge techniques that capture real-time force data to plot accordingly, which will provide a more expansive interpretation of test data. Comparing test specimens created on two different machines with dissimilar surface finishes may demonstrate an impact on the test specimens' ability to resist bending forces.