STTR Phase I: Support Material Characterization for Ultrasonic Rapid Prototyping

这项小型企业技术转让（STTR）第一阶段项目将对超声固化快速成型工艺的支撑材料的机械和物理性能要求进行表征。众所周知，超声激发会影响金属的变形特性，要么是通过高频循环载荷的叠加效应，要么是通过激发晶格结构，导致位错迁移率增强。为了确定在超声固结中材料沉积过程中，为了保证层间区保持均匀的接触应力，支撑材料必须具备什么样的性能，需要对铝在剪切载荷叠加超声激励下的剪切应力-应变曲线进行实验生成。该领域的工作仅针对拉伸平均应力进行，并附带超声剪切。该项目将提供试样的剪切载荷和超声剪切，并结合结合区中产生的位错子结构的广泛表征。这将有助于增加对超声激励下金属塑性变形的基本理解。这项技术的广泛影响可能是能够扩大在拉丝、挤压、管拉伸和球磨等方面的加工能力。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.