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Yielding onset in FGM thick-walled spherical shells under thermo-mechanical loading.

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Title: Yielding onset in FGM thick-walled spherical shells under thermo-mechanical loading.
Authors: Mamandi, Ahmad1 (AUTHOR) ahmad.mamandi@iau.ac.ir
Source: Journal of Reinforced Plastics & Composites. Feb2026, Vol. 45 Issue 3/4, p926-944. 19p.
Subjects: Functionally gradient materials, Spherical shells (Engineering), Material plasticity, Thermal gradient measurment, Stress concentration, Mechanical loads
Abstract: Based on von Mises yield criterion, a thermoelasto-plastic analysis of a thick-walled spherical shell composed of functionally graded material (FGM) subjected to internal pressure and thermal gradient is conducted in order to accurately predict the onset radius of yielding within the vessel wall. The modulus of elasticity, thermal conductivity and thermal expansion coefficients, and yield stress of FGM are assumed to follow power-law functions in radius according to Erdogan's model. The equilibrium differential equation of the shell under thermo-mechanical loading in steady-state conduction heat transfer are derived analytically and then solved to determine through-thickness variations of the radial and circumferential stresses and radial displacement in elastic and perfectly plastic zones in the vessel wall. The presented approach leads to the definition of new formulation to predict the onset radius of yielding. Moreover, a neural network (NN) solution to reliable quantify the influence of all uncertain input parameters with respect to uncertain output parameter is utilized. The numerical results showed that for various FGM parameters and specific thermal gradient, the plastic zone can commence from inside radius, outside radius, simultaneously in both radii, or may be launched in the intermediate radius of the spherical shell wall. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Reinforced Plastics & Composites is the property of Sage Publications, Ltd. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 191330986
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Yielding onset in FGM thick-walled spherical shells under thermo-mechanical loading.
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  Data: <searchLink fieldCode="AR" term="%22Mamandi%2C+Ahmad%22">Mamandi, Ahmad</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ahmad.mamandi@iau.ac.ir</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Reinforced+Plastics+%26+Composites%22">Journal of Reinforced Plastics & Composites</searchLink>. Feb2026, Vol. 45 Issue 3/4, p926-944. 19p.
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  Data: <searchLink fieldCode="DE" term="%22Functionally+gradient+materials%22">Functionally gradient materials</searchLink><br /><searchLink fieldCode="DE" term="%22Spherical+shells+%28Engineering%29%22">Spherical shells (Engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Material+plasticity%22">Material plasticity</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+gradient+measurment%22">Thermal gradient measurment</searchLink><br /><searchLink fieldCode="DE" term="%22Stress+concentration%22">Stress concentration</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+loads%22">Mechanical loads</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Based on von Mises yield criterion, a thermoelasto-plastic analysis of a thick-walled spherical shell composed of functionally graded material (FGM) subjected to internal pressure and thermal gradient is conducted in order to accurately predict the onset radius of yielding within the vessel wall. The modulus of elasticity, thermal conductivity and thermal expansion coefficients, and yield stress of FGM are assumed to follow power-law functions in radius according to Erdogan's model. The equilibrium differential equation of the shell under thermo-mechanical loading in steady-state conduction heat transfer are derived analytically and then solved to determine through-thickness variations of the radial and circumferential stresses and radial displacement in elastic and perfectly plastic zones in the vessel wall. The presented approach leads to the definition of new formulation to predict the onset radius of yielding. Moreover, a neural network (NN) solution to reliable quantify the influence of all uncertain input parameters with respect to uncertain output parameter is utilized. The numerical results showed that for various FGM parameters and specific thermal gradient, the plastic zone can commence from inside radius, outside radius, simultaneously in both radii, or may be launched in the intermediate radius of the spherical shell wall. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Reinforced Plastics & Composites is the property of Sage Publications, Ltd. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1177/07316844241289478
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      – Code: eng
        Text: English
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        PageCount: 19
        StartPage: 926
    Subjects:
      – SubjectFull: Functionally gradient materials
        Type: general
      – SubjectFull: Spherical shells (Engineering)
        Type: general
      – SubjectFull: Material plasticity
        Type: general
      – SubjectFull: Thermal gradient measurment
        Type: general
      – SubjectFull: Stress concentration
        Type: general
      – SubjectFull: Mechanical loads
        Type: general
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      – TitleFull: Yielding onset in FGM thick-walled spherical shells under thermo-mechanical loading.
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            – D: 01
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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            – TitleFull: Journal of Reinforced Plastics & Composites
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