MRI: Acquisition of a metal additive manufacturing system for multi-disciplinary research and education

这项主要研究仪器(MRI)奖提供资金，用于购买用于研究和教育的金属添加剂制造(AM)系统。该仪器将使研究人员能够发展生产具有高断裂和抗疲劳性能的金属的新知识，这是生物医学、国防、航空航天和汽车行业所需的。该仪器还将催化在用于声隐身、生物医学成像和健康监测的新型按需设计超材料方面的研究进展。金属AM系统将丰富研究生和本科教育，支持K-12学校的外联活动，并帮助教师研讨会。将开发一种新的虚拟现实金属AM教学模块，并向工科学生、高中生和公众提供。研究结果还将为新的机器学习和计算力学课程提供基础。所要求的金属AM系统将提供可在微观和细观尺度上处理的缺陷和气孔的结构信息，从而深入了解SLM系统的处理极限。将发展一个新的SPH模型来理解SLM过程中的粉末级物理，从而促进对分级金属SLM过程中结构发展的基本理解。中子衍射法将用来揭示工艺/结构对层状SLMed金属残余应力的影响。将通过拉伸和断裂韧性测试来观察分级金属的机械行为。利用这一新的加工-组织-性能信息，将进行有限元模拟，以发现SLMed金属中分层增韧机制的起源。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This Major Research Instrumentation (MRI) award provides funding to acquire a metal additive manufacturing (AM) system for research and education. The instrumentation will enable researchers to develop new knowledge on the production of metals with high fracture and fatigue resistance, which are needed for the biomedical, defense, aerospace, and automotive industries. The instrumentation will also catalyze research advances in novel on-demand design of metamaterials for acoustic cloaking, biomedical imaging, and health monitoring. The metal AM system will enrich graduate and undergraduate education, support outreach activities at K-12 schools, and aid teacher workshops. A new virtual reality metal AM teaching module will be developed and made available for engineering students, high-school students, and the public. Research findings will also provide the basis for a new machine learning and computational mechanics class. The requested metal AM system will provide structural information on defects and pores that can be processed at the micro- and meso-scale, providing insights into the processing limits of the SLM system. A new SPH model will be developed to understand the powder-level physics during the SLM process; thus, advancing fundamental understanding of the structure development during the SLM of hierarchical metals. Neutron diffraction will be used to reveal the processing/structure effects on the residual stresses in hierarchical SLMed metals. Mechanical behavior of the hierarchical metals will be observed via tensile and fracture toughness tests. Using this new processing-structure-property information, FEM simulations will be performed to discover the origins of hierarchical toughening mechanisms in SLMed metals.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.