Modeling of Size-Effect in Micro-Cutting Process Using Strain Gradient Plasticity

使用应变梯度塑性对微切削过程中的尺寸效应进行建模

• 批准号: 0300457
• 负责人: Shreyes Melkote
• 金额: $ 23.2万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-04-01 至 2007-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0300457&HistoricalAwards=false
• 关键词: Modeling; Size; Effect; Micro; Cutting

The primary purpose of this research grant is to develop a fundamental understanding of the mechanics of micro-cutting processes with a focus on the size-effect phenomenon. A secondary objective of the grant is to develop an understanding of chip formation and surface integrity in micro-cutting of important engineering materials such as ferrous and titanium alloys. The research approach for achieving these objectives involves the following tasks: 1) Development of analytical models based on strain gradient plasticity for the size-effect arising from the primary, secondary and tertiary deformation zones in orthogonal micro-cutting, 2) Verification of the size-effect models through orthogonal micro-cutting experiments on ferrous or titanium alloys, and 3) Experimental study of the effects of cutting conditions on chip formation and surface integrity in orthogonal micro-cutting process for ferrous or titanium alloys.If successful, the benefits of this project include advancement of fundamental understanding of chip formation, mechanics, and surface integrity in micro-cutting processes. This understanding will in turn benefit micro-cutting tool design, micro-lathe/mill design, and micro-cutting process optimization. Broader impact of the research will be realized through development of international partnerships with researchers at the National university of Singapore, international educational experience for the graduate students working on the project, and through the participation of middle/high school science and math teachers in some aspect of the project.

这项研究资助的主要目的是发展对微切削过程力学的基本理解，重点是尺寸效应现象。 该补助金的第二个目的是发展对重要工程材料（如铁和钛合金）微切削中切屑形成和表面完整性的理解。 实现这些目标的研究方法涉及以下任务：1）建立了基于应变梯度塑性理论的正交微切削中第一、第二和第三变形区尺寸效应的分析模型; 2）通过对铁基和钛基合金的正交微切削试验验证了尺寸效应模型; 3）正交微细切削铁、钛合金中切削条件对切屑形成和表面完整性影响的实验研究，如果成功，本项目的好处包括提高对切屑形成、力学、和表面完整性。 这一认识将反过来有利于微切削刀具设计，微车/铣设计，微切削工艺优化。 通过与新加坡国立大学的研究人员建立国际伙伴关系，为从事该项目的研究生提供国际教育经验，以及通过初中/高中科学和数学教师参与该项目的某些方面，将实现研究的更广泛影响。