The Role of Fracture in Metal Cutting Chip Formation

该研究项目旨在开发一种重要的新标准，以确定工作材料的可加工性，并提供一种重要的新方法来预测给定切削条件下的剪切角。这项研究包括在广泛的材料和条件下进行的测试，并包括一个简单的非切削测试，该测试给出了大应变下剪切应力随剪切应变的增长率。该结果将用于更好地理解工件化学和结构之间的关系以及大应变时剪切应力-剪切应变曲线的斜率。研究结果还将用于验证一种新的剪切角准则。这项工作的一个重要的次要目标是提供对大应变变形的基本机制的更好理解。

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.