The Role of Fracture in Metal Cutting Chip Formation

这项研究项目旨在开发一种重要的新标准来确定加工材料的可加工性，并提供一种重要的新方法来预测给定切割条件下的剪切角。这项研究涉及多种材料和条件的试验，其中包括一项简单的非切割试验，该试验给出了大应变下剪应力随剪应变的增加速率。研究结果将有助于更好地理解大应变条件下材料的化学成分与组织的关系以及剪切应力-剪切应变曲线的斜率。计算结果还将用于验证新的剪切角准则。这项工作的一个重要的次要目标是更好地了解大应变变形的基本机制。

This research project is directed towards the development of an important new criterion for establishing the machinability of a work material as well as to provide an important new method of predicting the shear angle for a given set of cutting conditions. This investigation involves tests on a wide range of materials and conditions and includes a simple noncutting test that gives the rate of increase of shear stress with shear strain for large strains. The results will be used to better understand the relation between workpiece chemistry and structure and the slope of the shear stress-shear strain curve for large strains. The results will also be used to verify a new shear angle criterion. An important secondary objective of this work is to provide a better understanding of basic mechanisms involved in large strain deformation.