Collaborative Research: Deformation Phenomena in Surface Texturing by Machining-Based Processes

合作研究：基于机械加工的表面纹理化变形现象

• 批准号: 1130525
• 负责人: Srinivasan Chandrasekar
• 金额: $ 13.97万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1130525&HistoricalAwards=false
• 关键词: Collaborative; Research; Deformation; Phenomena; Surface

The objective of this collaborative research project is to establish the fundamental principles that relate microstructure and micro-scale mechanical properties of textured surfaces created by machining-based processes to the controllable process variables. To accomplish this, an experimental study will characterize thermo-mechanical deformation conditions of strain, strain rate, temperature, that prevail during material removal in texturing and their effects on surface integrity. Techniques such as high-speed imaging and image correlation for deformation analysis, and advanced electron microscopy methods and nano-indentation for microstructure analysis, will be used. The experiments will be complemented by modeling of mechanics of material removal to estimate the transient plastic deformation that occurs in texturing by machining. By integrating these results, the nature of the deformation can eventually be predicted, complementing the much better understood geometric-topographic aspects of surface texture.If successful, the broader impact of the results will be improved performance and life of structural components through design and creation of novel surface textures. Based on the principles established herein, this design will incorporate both topography and surface integrity attributes, such as deformation and microstructure. The research will provide experimental and analytical tools for characterizing deformation and microstructure at multiple length scales, enabling among other things, understanding of the interplay between mechanics of surface texturing and surface integrity. Such an understanding is essential for characterizing the effects of texture on performance of structural components such as bearings, pumps, and diesel fuel sub-systems. Phenomenological insights will be obtained into transient deformation phenomena underlying material removal in machining and wear processes. Opportunities will likely emerge for exploiting the transient deformation phenomena as a means for reducing energy dissipation in machining processes.

这个合作研究项目的目标是建立与微观结构和微观尺度的机械性能的纹理表面的加工过程中创建的可控过程变量的基本原则。为了实现这一点，实验研究将表征热机械变形条件的应变，应变速率，温度，在纹理化过程中的材料去除及其对表面完整性的影响。将使用高速成像和图像相关等技术进行变形分析，并使用先进的电子显微镜方法和纳米压痕进行微观结构分析。这些实验将通过材料去除力学建模来补充，以估计机加工纹理中发生的瞬时塑性变形。通过整合这些结果，最终可以预测变形的性质，补充更好地理解表面纹理的几何-地形方面。如果成功，结果的更广泛影响将通过设计和创造新颖的表面纹理来提高结构部件的性能和寿命。基于本文建立的原理，该设计将结合形貌和表面完整性属性，例如变形和微观结构。该研究将提供实验和分析工具，用于表征多种长度尺度下的变形和微观结构，从而了解表面纹理力学和表面完整性之间的相互作用。这样的理解是必不可少的表征纹理的结构部件，如轴承，泵和柴油燃料子系统的性能的影响。现象学的见解将获得瞬态变形现象的加工和磨损过程中的材料去除。利用瞬态变形现象作为减少加工过程中能量耗散的一种手段，可能会出现机会。