Comparative Analysis of Bend Dominated and Stretch Dominated Titanium Lattice Structures

部落学院和大学方案(TCUP)的一个目标是提高为本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领域追求富有挑战性和回报的职业的机会，提供在可能具有文化意义的领域进行研究的机会，并鼓励社区和世代对科学和数学教育的欣赏。该项目与这一目标直接一致，而且将增加对使用钛的选择性激光熔化产生的夹层梁部件的材料特性的知识。纳瓦霍技术大学(NTU)将检查来自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，从而导致最佳强度与重量比的设计。这项研究将利用简支弯曲实验来探索两种结构，即拉伸主导(桁架型晶胞)和弯曲主导(十二面体晶胞)梁结构。这项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，这将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、力向量和过程中白光扫描的全景分析。该项目还使用了尖端技术，捕获实时力数据并进行相应的绘制，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创建的具有不同表面光洁度的测试试件可能会对测试试件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.