STTR Phase I: Support Material Characterization for Ultrasonic Rapid Prototyping

STTR 第一阶段：超声波快速成型的支撑材料表征

• 批准号: 0419730
• 负责人: Dawn White
• 金额: $ 9.82万
• 依托单位: Solidica, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0419730&HistoricalAwards=false
• 关键词: STTR; Phase; Support; Material; Characterization

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.

这一小型企业技术转让(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，超声激励可以通过高频循环载荷的叠加效应或通过激发晶格结构来影响金属的变形特性，从而导致位错迁移率的增强。为了确定支撑材料必须具有什么样的性质，以确保在超声固结中材料沉积期间在层间区域保持均匀的接触应力，需要在叠加超声激励下产生剪切载荷的铝的剪切应力-应变曲线。这方面的工作仅限于拉伸平均应力，叠加超声剪切。该项目将在试件上提供剪切载荷和超声波剪切，并结合对粘结区产生的位错亚结构的广泛表征。这将有助于加深对金属在超声波激励下的塑性变形的基本了解。这项技术的更广泛影响可能是扩大拉丝、挤压、拉管和球磨等方面的加工能力。从这项技术得出的数据可能会对关注超声波对金属变形影响的科学家们产生极大的兴趣。