Fluidity Onset Analysis in FG Thick-Walled Spherical Tanks under Concurrent Pressure Loading and Heat Gradient

Subject Areas : Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering

منصور عسگری ¹ (دانشجوی کارشناسی ارشد، دانشکده مکانیک و هوا فضا، دانشگاه آزاد اسلامی واحدعلوم و تحقیقات تهران)
علی پرویزی ² (استادیار، دانشکده مهندسی مکانیک، پردیس دانشکده‌های فنی، دانشگاه تهران)
شهریار علی کرمی ³ (دانشجوی کارشناسی ارشد، دانشکده مکانیک و هوا فضا، دانشگاه آزاد اسلامی واحدعلوم و تحقیقات تهران)

Received: 2015-11-04 Accepted : 2015-11-04 Published : 2014-12-22

Keywords: Fluidity onset, FG thick-walled sphere, Concurrent loading, Pressure loading and heat gradient,

Abstract :

In this paper,fluidity onset analysis in FG thick-walled spherical tanks under concurrent pressure loading and heat gradient has been presented. Designing thick-walled spherical tanks under pressure as tanks holding fluids under heat loads with high heat gradients require new approaches. Under high internal pressure and high temperature, the tank enters the plastic stage in a part of its thickness; hence, for designing, a tank, which necessitates the onset of fluidity, is required for pressure study and heat gradient. Elasticity module, tensile yield, heat flow coefficient and heat expansion coefficient change gradually and, according to the power model, along radial direction. In order to describe the material behavior in the plastic area in the FG thick-walled spherical tank under internal pressure and heat gradient, Treska yield index has been used, and materials’ behavior has been assumed to be in elastic-plastic form.

References:

[1] ملک زاده فرد، کرامت و نظری، علی ، تحلیل ورق­ها و پوسته­های هدفمند تابعی، انتشارات الماس البرز، 1392، کرج.

 [2] MendelsonA., Plasticity Theory and ApplicationNew York: The Macmillan Company, 1968.

[3] BoleyB.A., WeinerJ.H., International Journal of Thermal Stresses, New York, Wiley, 1960

 [4] Whalley E., The Design of Pressure Vessels Subjected to Thermal Stress, Review, International Journal of Mechanical Sciences,1960,pp. 379-395.

 [5] CowperJ.R., The elastopastic thick-walled sphere subjected to a radial temperature gradient, Transaction of the ASME, 1960

[6] DerringtonM.G., JohnsonW., The onset of yield in a thick spherical shell subject to internal pressure and a uniform heat flow, Applied Science Research Series A, Vol. 7, 1958,pp. 408-414.

[7]­­­­-­TanigawaY., Some basic thermoplastic problems for nonhomogeneous structural Materials, Applied Mechanics Reviews, Vol. 48, 1995,pp. 377-389.

[8] ObataY., NodaN., Steady thermal stresses in a hollow circular cylinder and hollow sphere of functionally gradient material,International Journal of Thermal Stresses, Vol. 7, No. 17, 1994,pp. 471-488.

[9] TutuncuN. andOzturkM., Exact solution for stresses in functionally graded pressure vessels,Composites: Part B (Engineering), Vol. 32,2001,pp. 683-686.

[10] Rodrı´guez-CastroR.,Wetherhold R.C.,KelestemurM.H., Microstructurand mechanical behavior of functionally graded Al A359/SiCp composite,Materials Science and Engineering, A, Vol. 323, 2002, pp. 445-456.

[11] Parvizi A., Naghdabadi R., ArghavaniJ., Analysis of Al A359/SiCp  Functionally Graded Cylinder Subjected to Internal Pressure and Temperature Gradient with Elastic-Plastic Deformation, International Journal  of Thermal Stresses, Vol. 34, No. 10,20111054-1070.

[12] NayebiA., SadrabadiS.A., FGM Elastoplastic analysis under thermo mechanical loading, International Journal of Pressure Vessels and Piping, 2013.