Analysis Of Strain In Cutting Area Using Digital Image Correlation Technique And Software Design

The traditional research for metal cutting is mainly restricted to conventional cutting experiments,metallic phase observing and FEM simulation.However,the traditional experiment method cannot measure the strain directly.FEM simulation is deeply depend on material parameters,which is hard to obtain under high strain rate and high temperature.Due to the reasons mentioned above,this article is focused on applying the digital image correlation technique on metal cutting and analyzing the chip deformation process.This paper is consisted of three parts.Part one is a detail introduction to digital image correlation algorithm,including different matching criterions,Newton-Gaussian iterative strategy,optimal searching algorithm,B-quintic spline interpolation algorithm and post processing of velocity field.Part two is an introduction to the experimental analysis of orthogonal cutting.High speed camera cutting system and double frame camera cutting system are introduced separately and correspond experimental result is given.Part three is an introduction to the digital image correlation software,data structure and class design.In this paper,a self-designed digital image correlation software is proposed and the metal flow and strain and stress field during orthogonal cutting are discussed.