Publication: Evaluation of stress intensity factors for multiple surface cracks in bi-material tubes
No Thumbnail Available
Date
2009
Authors
Purbolaksono J.
Ali A.A.
Khinani A.
Rashid A.Z.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
This paper presents stress intensity factors (SIFs) of multiple semi-elliptical surface cracks in bi-material tubes subjected to internal pressure by boundary element method. In this case the water-tube boiler with oxide scale formed on the inner surface due to prolonged exposure at elevated temperature is considered as the bi-material tubes. Variations of modulus of elasticity and thickness for the oxide scale are used to evaluate their effects on the stress intensity factors. The increasing of thickness of the oxide scale causes decreasing values of the normalized stress intensity factor as the modulus of elasticity for the oxide scale is greater than that of the tube metal. Conversely, if the modulus of elasticity for the oxide scale is smaller, the increasing of thickness of the scale would also give increasing values of the normalized stress intensity factor. � 2009 Elsevier Ltd. All rights reserved.
Description
Keywords
Bi-material , Boundary element modeling , Multiple surface crack , Stress intensity factors , Tubes , Asphalt pavements , Boundary element method , Cracks , Elastic moduli , Elasticity , Materials , Scale (deposits) , Stress intensity factors , Tubes (components) , Bi-material , Boundary element modeling , Elevated temperature , Inner surfaces , Internal Pressure , Modulus of elasticity , Multiple surface crack , Multiple surfaces , Oxide scale , Semi-elliptical surface cracks , Tubes , Water-tube boiler , Surfaces