Comparative Analysis of Bend Dominated and Stretch Dominated Titanium Lattice Structures

部落学院和大学方案的一个目标是提高为全国土著学生服务的特定高等教育机构的科学、技术、工程和数学教学和研究能力。扩大这些机构的STEM课程设置，扩大了学生在STEM领域追求具有挑战性和回报的职业的机会，为可能具有文化意义的领域提供了研究，并鼓励社区和一代人对科学和数学教育的欣赏。该项目与这一目标直接相关，并将增加对通过选择性激光熔化钛制造的夹层梁部件的材料特性的知识。纳瓦霍技术大学（NTU）将研究两种不同设计的数据及其意义，并为比较其他夹层梁设计奠定基础，从而导致最佳强度重量比的设计。本研究将探讨两种结构，拉伸为主（桁架型格子）和弯曲为主（十二面体型格子）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本的3D计算机模型。NTU将与劳伦斯利弗莫尔国家实验室（LLNL）合作，包括但不限于指导测试和测试过程数据收集的适当结构设计。测试的另一个方面将使用高速摄像系统来获得力、力矢量和过程中白色光扫描的全景分析。该项目还使用了捕捉实时力数据的尖端技术来绘制相应的曲线，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造的具有不同表面光洁度的试样可能会对试样抵抗弯曲力的能力产生影响。

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.