PLANE-STRESS MODEL FOR FRACTURE OF CERAMICS DURING LASER CUTTING

被引：78

作者：

LI, K

SHENG, P

机构：

[1] Department of Mechanical Engineering, University of California, Berkeley

来源：

INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE | 1995年 / 35卷 / 11期

关键词：

D O I：

10.1016/0890-6955(94)00127-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper presents an experimental and numerical study of fracture initiation in thin aluminum oxide ceramics (Al2O3) during laser cutting. In the experiments, alumina plates with thickness of 0.8 mm were cut at cutting speeds of 1.3-152 mm/sec by continuous-wave CO2 laser with power ranging from 200 to 700 W. Criteria for fracture initiation are correlated with laser power and cutting speed. A hybrid method for modeling fracture initiation is introduced whereby the kerf width is determined through an analytical solution and the temperature and stress distributions are found through a numerical plane stress model. Temperature dependence of material properties was incorporated in the model. Effect of cutting speed and laser power on the fracture initiation was analyzed quantitatively and good agreement was obtained between the experiment and the numerical simulation. The results showed that avoidance of fracture initiation results from a high energy density cutting condition (high laser power and low cutting speed).

引用

页码：1493 / 1506

页数：14

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