Experimental and finite element prediction of bursting pressure in compound cylinders

Majzoobi, G.H.; Farrahi, G.H.; Pipelzadeh, M K; akbari, karim

doi:10.1016/j.ijpvp.2004.06.011

Cited by 25 publications

(18 citation statements)

References 3 publications

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“…They found that there is no benefit in the re-autofrettage of a tube with the same autofrettage pressure, and the real benefit comes from using a low autofrettaged pressure first then a higher one. Compound autofrettaged and shrinkfitted cylinders have been also used to increase the beneficial compressive residual stresses at the near bore area of the cylinder [3][4][5][6]. As discussed, the previous investigations were mainly focused on inducing beneficial residual stresses at the near bore area, neglecting the outer part.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Residual Stresses in Thick Wall Cylinders Using Multiple Autofrettage

Abdelsalam

2014

The International Conference on Applied Mechanics and Mechanica

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Autofrettage and Re-autofrettage processes have been used to generate compressive residual stress at the near bore area of the cylinder to enhance the load carrying capacity of the cylindrical pressure vessels. These processes' main drawback appears in the detrimental high tensile residual stress at the outer part of the cylinder. On the basis of these findings, internal surface autofrettage combined with external surface autofrettage processes have been used to improve not only by increasing of compressive residual stress at the near bore area but also by decreasing of tensile residual stress at the outer surface area. For these cyclic plasticity processes, an accurate finite element model governed by non-linear kinematic hardening model (Chaboche model) has been used. This model simulates the measured stress-strain actual behavior for NiCrMoV125 steel alloy.---

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Section: Introductionmentioning

confidence: 99%

Improvement of Residual Stresses in Thick Wall Cylinders Using Multiple Autofrettage

Abdelsalam

2014

The International Conference on Applied Mechanics and Mechanica

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“…Thus, introducing compressive residual stresses near the bore can reduce the overall level of tensile stresses experienced at the bore area which has direct effect on fatigue life. Shrink-fit and autofrettage processes applied individually or in combination have been effectively used to induce favorable compressive residual hoop stresses [1][2][3][4][5][6]. In autofrettage process which typically applied in monoblock cylinders, the pressure is increased to a prescribed value under which the region near bore area undergoes plastic deformation while the remaining area is still under elastic deformation.…”

Section: Introductionmentioning

confidence: 99%

“…In the autofrettage process, the maximum induced compressive residual hoop stress is mainly limited due to the Bauschinger effect which causes reduction of compressive yield strength of the material in the yielded zone [2,3]. Combination of shrink-fit and autofrettage applied to layered cylindrical shells seems to be effective to remedy the limitations associated with these processes and thus to be able to produce better residual stress distribution through the thickness of the compound cylinder [4][5][6]. Due to many parameters involves, such as sequence of combination, thickness of layers, autofrettage pressure, and radial inference, design optimization of these multilayer cylinders become of paramount importance to provide optimal residual stress distribution.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of Compound Cylinders Subjected to Autofrettage and Shrink-Fitting Processes

Abdelsalam¹

2013

Journal of Pressure Vessel Technology

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The autofrettage and shrink-fit processes are used to increase the load bearing capacity and fatigue life of the pressure vessels under thermomechanical loads. In this paper, a design optimization methodology has been proposed to identify optimal configurations of a two-layer cylinder subjected to different combinations of shrink-fit and autofrettage processes. The objective is to find the optimal thickness of each layer, autofrettage pressure and radial interference for each shrink-fit, and autofrettage combination in order to increase the fatigue life of the compound cylinder by maximizing the beneficial and minimizing the detrimental residual stresses induced by these processes. A finite element model has been developed in ANSYS environment to accurately evaluate the tangential stress profile through the thickness of the cylinder. The finite element model is then utilized in combination with design of experiment (DOE) and the response surface method (RSM) to develop a smooth response function which can be effectively used in the design optimization formulation. Finally, genetic algorithm (GA) combined with sequential quadratic programming (SQP) has been used to find global optimum configuration for each combination of autofrettage and shrink-fit processes. The residual stress distributions and the mechanical fatigue life based on the ASME code for high pressure vessels have been calculated for the optimal configurations and then compared. It is found that the combination of shrink-fitting of two base layers then performing double autofrettage (exterior autofrettage prior to interior autofrettage) on the whole assembly can provide higher fatigue life time for both inner and outer layers of the cylinder.

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“…They could not present exact formulations for their optimum design. In another work by Majzoobi et al [13], the cylinders of two-layer compound cylinder were subjected to bursting and autofrettage pressures. Numerical simulations of the compound cylinders were performed using the finite element code, NISA, to predict the optimum shrinkage radius to a reasonable accuracy.…”

Section: Introductionmentioning

confidence: 99%

A New Analytical Solution for Optimum Design of Shrink-Fit Multi-Layer Compound Cylinders

Sharifi

Hematiyan

Banan

2012

Volume 5: High-Pressure Technology; ASME NDE Division

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In this paper, by using an analytical optimization method, formulas for general optimum design of multi-layer compound cylinders are presented. For this purpose, considering the Tresca's yield criterion, the maximum shear stresses occurred simultaneously in inner radiuses of all layers, are minimized. The formulas for obtaining optimum values of layers radiuses, contact pressures, and radial interferences are derived. A technique for shrink-fitting of cylinders is also described and relationships for radial interferences and required temperature differences between cylinders for each step of the shrink-fitting process are derived using an analytical method. It is indicated that compound cylinders with more layers have higher internal pressure capacity for a specified weight. Three different examples are presented to show the effectiveness of the method.

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Experimental and finite element prediction of bursting pressure in compound cylinders

Cited by 25 publications

References 3 publications

Improvement of Residual Stresses in Thick Wall Cylinders Using Multiple Autofrettage

Improvement of Residual Stresses in Thick Wall Cylinders Using Multiple Autofrettage

Design Optimization of Compound Cylinders Subjected to Autofrettage and Shrink-Fitting Processes

A New Analytical Solution for Optimum Design of Shrink-Fit Multi-Layer Compound Cylinders

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