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 , علی پرویزی ² , شهریار علی کرمی ³

1 - دانشجوی کارشناسی ارشد، دانشکده مکانیک و هوا فضا، دانشگاه آزاد اسلامی واحدعلوم و تحقیقات تهران
2 - استادیار، دانشکده مهندسی مکانیک، پردیس دانشکده‌های فنی، دانشگاه تهران
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.

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