Fatigue design of an autofrettaged thick-walled pressure vessel using CAE techniques

Koh, Seung Kee; Lee, S.I.; Chung, Suk Bum; Lee, K.Y.

doi:10.1016/s0308-0161(97)00066-5

Cited by 10 publications

(8 citation statements)

References 8 publications

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“…In the paper of Koh et al [16] the fatigue design of autofrettaged thick-walled pressure vessel with an external groove was performed using computer aided engineering techniques, incorporating the shape optimization algorithm and the finite element technique. In order to increase fatigue life the idea of double grooved pressure vessel is used instead of conventional groove.…”

Section: Literature Reviewmentioning

confidence: 99%

“…(14)- (16) and in Box 1 De N ij are the elastic-plastic strain increments, Dr N ij are the actual elastic-plastic stress components, S ij are deviatoric stress components, De p eq is the equivalent plastic strain increment, Dr eq means is the equivalent stress increment, m is the Poisson's ratio, and d ij is the Kronecker delta (notation after Ref. [43]).…”

Section: Incremental Nc Rules For Multiaxial Loadingmentioning

confidence: 99%

“…The ESED equations set and material constitutive Eqs. (14)- (16) are displayed explicitly in Box 2. The stress and strain states at the end of given load increment is computed from…”

Section: Equivalent Strain Energy Density (Esed) Relationsmentioning

confidence: 99%

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Optimal design of machine components using notch correction and plasticity models

Wilczynski

Mróz

2007

Computers & Structures

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Section: Literature Reviewmentioning

confidence: 99%

Section: Incremental Nc Rules For Multiaxial Loadingmentioning

confidence: 99%

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Optimal design of machine components using notch correction and plasticity models

Wilczynski

Mróz

2007

Computers & Structures

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“…[3][4][5][6][7] To improve performance under such conditions, a favorable compressive residual hoop stress can be produced near the bore of the cylinder, commonly by an autofrettage process prior to use. [8][9][10][11][12][13][14][15][16][17] In manufacturing practice, using high pressure to carry out the autofrettage processes is complex, inefficient, and dangerous. This is because a high hydraulic pressure up to 2000 MPa, close to causing cylinder failure, is needed.…”

Section: Introductionmentioning

confidence: 99%

Design of two-pass swage autofrettage processes of thick-walled cylinders by computer modeling

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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An ever-increasing industrial demand for pressurized thick-walled cylindrical components drives research and practice to increase their strength–weight ratio, extend their fatigue life, or to increase their pressure-carrying capacity. This can be achieved through an energy-efficient and safe two-pass swage autofrettage process by generating a favorable compressive residual hoop stress field in the inner layer of the cylinder prior to use. In this paper, a two-pass swage autofrettage process of a thick-walled cylinder was systematically investigated based on finite element analysis. A 105 mm cannon barrel made of high-pressure vessel steel ASTM A723-1130 was taken as a case study. An elastic nonlinear-hardening plastic material model with the Bauschinger effect was adopted. The mandrel’s axial pushing forces during swage autofrettage processes were analyzed. A 30–35% reduction in mandrel’s pushing forces has been achieved in the two-pass process. The residual stresses in swage autofrettaged thick-walled cylinders were predicted. The results of computer modeling were in agreement with neutron diffraction measurements. A maximum 18% reduction in von Mises stress in the swage autofrettaged thick-walled cylinders under an elastic-limit working pressure was identified. A maximum 31% increase in pressure-carrying capacity for the swage autofrettaged thick-walled cylinders was revealed. The optimum radial interference was proposed. Results from the two-pass process were compared with those from the single-pass process.

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“…Otsuka et al (2012) introduced relief grooves in the contact area of lever and lever guide of a sealing mechanism for ultra-high pressure processing equipment, achieving a decrease of stress levels at the zone of stress concentration. Koh et al (1997) used stress constraints in the parametric optimization of the size and number of the external grooves of a thick walled vessel under pulsating pressure, in order to minimize the stress concentration at the grooves, thus increasing the fatigue life of the vessel. Ghelichi et al (2011) optimized the shape of the notch geometry of components subject to multiaxial cyclic loads, using the Liu -Zenner criterion, decreasing the stress concentration at the notch.…”

Section: Introductionmentioning

confidence: 99%

Size optimization of shoulder filleted shafts with relief grooves for improving their fatigue life

et al. 2017

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Although in scientific literature there are studies regarding the inclusion of relief grooves in order to diminish the amount of stress concentration in stepped shafts, the incorporation of optimization algorithms capable of parametrically determining their geometry remains unexplored. In this paper, an approach to the problem of size optimization of shoulder filleted shafts with relief grooves and subject to axial loads is presented. The objective of the optimization is to minimize the maximum value of stress at both, the root of the shoulder fillet, and the root of the groove, thus minimizing stress concentration and improving fatigue life of such elements. Under this methodology, different percentages of reduction of stress are achieved for the shafts with relief grooves, in comparison with the shafts without relief grooves. The novelty of this approach lies in the incorporation of an algorithm for the determination of the optimum geometry of the grooves. Keywords:Size optimization, stress concentration, relief groove RESUMENAun cuando en la literatura científica se puede hallar artículos sobre la inclusión de ranuras de alivio para disminuir el nivel de concentración de esfuerzo en flechas escalonadas, la incorporación de algoritmos de optimización capaces de determinar su geometría de manera paramétrica permanece sin explorarse. En este artículo se presenta un enfoque al problema de optimización de tamaño de flechas escalonadas con ranuras de alivio, sujetas a cargas axiales. El objetivo de la optimización es minimizar el valor máximo del esfuerzo, tanto en la raíz del escalón como en la raíz de la ranura, disminuyendo la concentración de esfuerzo y mejorando la vida a la fatiga de tales elementos mecánicos. Bajo esta metodología, se alcanzan diversos porcentajes de reducción del esfuerzo al comparar las flechas ranuradas con las flechas no ranuradas. El enfoque aporta la incorporación de un algoritmo para la determinación de la geometría óptima de las ranuras de alivio. S.E.P.I. Zacatenco, I.P.N., Mexico. E-mail: johann009@yahoo.com 2 Ph.D. in Physics, Université Libre de Bruxelles, Belgium. Affiliation: S.E.P.I.Zacatenco, I.P.N., Mexico. E-mail: sammotion@yahoo.com.mx 3 Ph.D. in Mechanical Engineering, S.E.P.I. Zacatenco, I.P.N., Mexico. Affiliation: U.P.I.I.T.A., I.P.N., Mexico. E-mail: jsilval@ipn.mx 4 M.Sc. in Mechanical Engineering, S.E.P.I. Zacatenco, I.P.N., Mexico. Affiliation: S.E.P.I. Zacatenco, I.P.N., Mexico. E-mail: alejo_10b10@yahoo.com.mx 5 Ph.D. in Mechanical Engineering, S.E.P.I. Zacatenco, I.P.N., Mexico. Affiliation: S.E.P.I. Zacatenco, I.P.N., Mexico. E-mail: ingaor@hotmail.com How to cite: González-Mendoza, J.M., Alcántara-Montes, S., Silva-Lomelí, J.J., De La Cruz-Alejo, C., Ocampo-Ramírez, A., (2017). Size Optimization of shoulder filleted shafts with relief grooves for improving their fatigue lives.

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Fatigue design of an autofrettaged thick-walled pressure vessel using CAE techniques

Cited by 10 publications

References 8 publications

Optimal design of machine components using notch correction and plasticity models

Optimal design of machine components using notch correction and plasticity models

Design of two-pass swage autofrettage processes of thick-walled cylinders by computer modeling

Size optimization of shoulder filleted shafts with relief grooves for improving their fatigue life

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