چکیده مقاله
In this paper, the melting of a semi infinite body as a result of a moving laser beam has been studied Because the Fourier heat transfer equation at short times and large dimensions does not have sufficient accuracy; a non Fourier form of heat transfer equation has been used Due to the fact that the beam is moving in x direction, the temperature distribution and the melting pool shape are not asymmetric As a result, the problem is a transient three dimensional problem Therefore, thermophysical properties such as heat conductivity coefficient, density and heat capacity are functions of temperature and material states The enthalpy technique, used for the solution of phase change problems, has been used in an explicit finite volume form for the hyperbolic heat transfer equation This technique has been used to calculate the transient temperature distribution in the semi infinite body and the growth rate of the melt pool Temporal variation of laser beam intensity in two cases of continuous and pulsatile heat flux has been considered The latter case is a model of electrical discharge machining EDM In order to validate the numerical results, comparisons were made with experimental data Finally, the results of this paper were compared with similar problem that has used the Fourier theory The comparison shows the influence of infinite speed of heat propagation in Fourier theory on the temperature distribution and the melt pool size
کلیدواژهها
نویسندگان
Mohammad Akbari
PhD student, Faculty of Mechanical Engineering,Semnan University
Seifollah Sadodin
Assistant Professor, Faculty of Mechanical Engineering,Semnan University
Ali Jahangiri
PhD student, Faculty of Mechanical Engineering,Semnan University
Ehsan Rasti
PhD student, Faculty of Mechanical Engineering,Semnan University
شیوه ارجاع
Akbari, Mohammad and Sadodin, Seifollah and Jahangiri, Ali and Rasti, Ehsan,1389,Calculation and investigation of temperature distribution and melt pool size due to a moving laser heat source using the solution of hyperbolic heat transfer equation,11th Iranian Conference on Manufacturing Engineering (ICME 2010),Tabriz
ارائهشده در
مجموعه مقالات یازدهمین کنفرانس ملی مهندسی ساخت و تولید ایران27 مهر 1389 · تبریز