STTR Phase I: Support Material Characterization for Ultrasonic Rapid Prototyping

这个小企业技术转让（STTR）第一阶段项目将导致超声固结快速成型工艺的支撑材料的机械和物理性能要求的表征。已知超声波激励通过作为高频循环载荷的叠加效应或通过晶格结构的激励来影响金属的变形特性，从而导致增强的位错移动性。实验生成的剪切应力-应变曲线的铝经受剪切加载与叠加的超声波激励是必需的，以确定什么属性的支持材料必须有，以确保均匀的接触应力可以保持在层间区域中的材料沉积在超声波固结。在这方面的工作已经进行了拉伸平均应力，叠加超声剪切。该项目将提供剪切载荷的标本，和超声剪切，结合广泛的表征所产生的位错亚结构的粘结区。这将有助于增加对超声波激励下金属塑性变形的基本理解。该技术的更广泛影响可能是扩大拉丝、挤压、拉管和球磨等加工能力的能力。 从这项技术中获得的数据可能会引起关注超声波对金属变形影响的科学家的极大兴趣。

This Small Business Technology Transfer (STTR) Phase I project will result in the characterization of the mechanical and physical properties requirements for a support material for an ultrasonic consolidation rapid prototyping process. Ultrasonic excitation is known to affect the deformation characteristics of metals, either through superposition effects as a high frequency cyclic load, or through excitation of the lattice structure, resulting in enhanced dislocation mobility. Experimental generation of a shear stress-strain curve for aluminum undergoing shear loading with superimposed ultrasonic excitation is required to determine what properties a support material must have in order to ensure that uniform contact stresses can be maintained in the interlaminar zone during material deposition in ultrasonic consolidation. Work in this area has been undertaken for tensile mean stresses only, with superimposed ultrasonic shear. This project will provide shear loading on the specimens, and ultrasonic shear, combined with extensive characterization of the resulting dislocation substructures in the bond zones. This will contribute to increased fundamental understanding of plastic deformation of metals in the presence of ultrasonic excitation.The broader impact from this technology could be the ability to expand processing capability in wire drawing, extrusion, tube drawing, and to ball milling to name a few. The data that is derived from this technology could be of great interest to scientists concerned with ultrasonic effects on deformation of metals.