Open Access

ARTICLE

Effects of Heat Affected Zones Temperature on the General Performance of High Temperature Vacuum Tube Furnace

by A.B. Mahmud Hasan¹, M A Wahab¹, S.M. Guo¹

1 Mechanical Engineering Department, Louisiana State University, Baton Rouge, LA-70803, USA
2 Contact address: Tel.: +1-225-382-2153; fax: +1-225578-5924; E-mail: ahasan94@gmail.com

Structural Durability & Health Monitoring 2008, 4(4), 231-240. https://doi.org/10.3970/sdhm.2008.004.231

Abstract

This paper presents details analysis of Heat Affected Zone (HAZ) in High Temperature Vacuum Tube Furnace (HTVTF) to predict fracture region in tube wall due to thermal stress from temperature variation across its thickness. A simple mathematical model is used to illustrate stress concentration arising due to thermal stresses in tube wall and HAZs. Finite element model and analysis were carried out utilizing finite element analysis commercial codes. Combination of thermal stress due to temperature difference determine fracture region. Experimental and simulation results of inside temperature of tube are observed and similar relation have been found. Observation of heat affected blocks indicates near region of HAZ. It is observed that different air flow rates have some effects in reducing thermal stress. Analysis shows that inserting a small pipe inside the first block will reduce thermal stress generation inside HAZs and eventual fracture of the vacuum tube. It is expected that this study is essential for HTVTF design.

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Keywords

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