Residual stresses in autofrettaged vessel made of functionally graded material

Jahromi, Babak Haghpanah; Farrahi, G.H.; Maleki, Mehdi; Nayeb-Hashemi, Hamid; Vaziri, Ashkan

doi:10.1016/j.engstruct.2009.07.019

Cited by 25 publications

(13 citation statements)

References 14 publications

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“…This assumption should be verified for each set of constitutive parameters. The corresponding condition follows from Equations (6) and (16), in the form…”

Section: Purely Elastic Solutionmentioning

confidence: 99%

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A Theory of Autofrettage for Open-Ended, Polar Orthotropic Cylinders

2019

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Autofrettage is a widely used process to enhance the fatigue life of holes. In the theoretical investigation presented in this article, a semi-analytic solution is derived for a polar, orthotropic, open-ended cylinder subjected to internal pressure, followed by unloading. Numerical techniques are only necessary to solve a linear differential equation and evaluate ordinary integrals. The generalized Hooke’s law connects the elastic portion of strain and stress. The flow theory of plasticity is employed. Plastic yielding is controlled by the Tsai–Hill yield criterion and its associated flow rule. It is shown that using the strain rate compatibility equation facilitates the solution. The general solution takes into account that elastic and plastic properties can be anisotropic. An illustrative example demonstrates the effect of plastic anisotropy on the distribution of stresses and strains, including residual stresses and strain, for elastically isotropic materials.

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“…This assumption should be verified for each set of constitutive parameters. The corresponding condition follows from Equations (6) and (16), in the form…”

Section: Purely Elastic Solutionmentioning

confidence: 99%

“…Numerical methods have been developed in [13][14][15] for materials with nonlinear stress-strain behavior. An effect of varying elastic and plastic material properties along the radius on the distribution of residual stresses in autofrettaged cylinders has been evaluated in [16].…”

Section: Introductionmentioning

confidence: 99%

A Theory of Autofrettage for Open-Ended, Polar Orthotropic Cylinders

2019

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“…The accuracy of the residual stresses calculation is determined by the nature of the elastic‐plastic analysis employed and the elastic‐plastic material data available. Analytical approaches based on the deformation theory of plasticity have been proposed from early through to more recent studies. This type of analysis is limited to proportional loading, relatively simple component geometry, and single applications of autofrettage pressure.…”

Section: Introductionmentioning

confidence: 99%

High cycle fatigue analysis in the presence of autofrettage compressive residual stress

Okorokov

Mackenzie

Gorash

et al. 2018

Fatigue Fract Eng Mat Struct

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An experimental and numerical investigation of the effect of residual compressive stress on the high cycle fatigue life of notched low carbon steel test specimens is presented. Experimentally determined cyclic stress strain curves for S355 low carbon steel are utilized in a finite element analysis plasticity modelling framework incorporating a new cyclic plasticity material model representative of cyclic hardening and softening, cyclic mean stress relaxation, and ratcheting behaviors. Fatigue test results are presented for standard tensile fatigue test specimens and novel double notch specimens. Double notch specimens are tested with and without compressive residual stress prior‐induced through tensile overload. It is shown that cyclic plasticity phenomena have a significant influence on the induced residual stress distribution and also on material behavior when fatigue tested in the high cycle regime. It is observed that higher initial compressive residual stresses magnitude does not necessarily lead to a longer fatigue life. Finite element analysis using the new cyclic plasticity material model shows this behavior is due to combined residual stress redistribution under fatigue test cyclic loading and cyclic hardening effects. A fatigue life methodology based on the stress‐life approach augmented by a critical distance method is proposed and shown to give good agreement with experimental results for test specimens with no induced residual stress. The results obtained for specimens with induced residual stress are more conservative, but the degree of conservatism is significantly lower than that in the conventional stress life approach. The proposed methodology is therefore suitable for analysis and design assessment of components with pre‐service induced compressive residual stress, such as autofrettaged pressure components.

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“…Besides decreasing tensile thermal stresses, studies have shown that the proper FGM design can also increase compressive stresses, which can lead to enhanced fatigue life of the component [34]. …”

Section: Introductionmentioning

confidence: 99%

Influence of interlayer design on residual thermal stresses in trilayered and graded all-ceramic restorations

Henriques

Fabris

Souza

et al. 2017

Materials Science and Engineering: C

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Residual thermal stresses are formed in dental restorations during cooling from high temperature processing. The aim of this study was to evaluate the influence of constructive design variables (composition and interlayer thickness) on residual stresses in alumina- and zirconia-graded restorations. Restorations' real-like cooling conditions were simulated using finite elements method and temperature-dependent material properties were used. Three different designs were evaluated: a bilayered restoration (sharp transition between materials); a trilayered restoration with a homogenous interlayer between core and veneer; and a trilayered restoration with a graded interlayer. The interlayer thickness and composition were varied. Zirconia restorations presented overall higher thermal stress values than alumina ones. Thermal stresses were significantly reduced by the presence of a homogeneous interlayer. The composition of the interlayer showed great influence on the thermal stresses, with the best results for homogeneous interlayers being observed for porcelain contents in the composite ranging between 30%-50% (vol.%), for both alumina and zirconia restorations. The interlayer's thickness showed a minor contribution in the thermal stress reduction. The graded interlayer showed an optimized reduction in restorations' thermal stresses. The use of graded interlayer, favoring enhanced thermal stress distributions and lower magnitude is expected to reduce the risk of catastrophic failure.

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Residual stresses in autofrettaged vessel made of functionally graded material

Cited by 25 publications

References 14 publications

A Theory of Autofrettage for Open-Ended, Polar Orthotropic Cylinders

A Theory of Autofrettage for Open-Ended, Polar Orthotropic Cylinders

High cycle fatigue analysis in the presence of autofrettage compressive residual stress

Influence of interlayer design on residual thermal stresses in trilayered and graded all-ceramic restorations

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