Theoretical Analysis of Heat Stress Prefabricating the Crack in Precision Cropping

• Main Authors: Lijun Zhang, Yongrui Zhao
• Format: Article
• Language: English
• Published: Eastern Macedonia and Thrace Institute of Technology 2013-07-01
• Series: Journal of Engineering Science and Technology Review
• Subjects: Precision cropping; Heat stress; Crack; V-shaped notch; Temperature field
• Online Access: http://www.jestr.org/downloads/Volume6Issue1/fulltext256113.pdf

The mathematical model of the metal bar in course of heat treatment is built by regarding the convective heat transfer process of the metal bar as the heat conduction boundary condition. By the theory analysis and numerical simulation methods, the theoretical expression of unsteady multidimensional temperature field for the axisymmetric model of metal bar is obtained. Temperature field distribution of bar V-shaped notch equivalent tip is given by ANSYS software. The quantitative relationship between temperature of bar inner key points and the time is determined. Through the polynomial curve fitting, the relation between the ultimate strength and the temperature is also given. Based on it, the influences of the width of the adiabatic boundary and water velocity on the critical temperature gradient of germinating heat crack in the tip of V-shaped notch are analyzed. The experimental results in precision cropping show that the expression of unsteady multidimensional temperature field is feasible in the rapid calculation of crack generation.