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Journal articles on the topic 'Autofrettage'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Zhao, Ya Li, Quan Kun Liu, and Ling Yun Qian. "Theoretical Analysis and Finite Element Simulation of Autofrettage for Extrusion Die." Advanced Materials Research 472-475 (February 2012): 1749–53. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.1749.

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The design of extrusion die has been investigated by autofrettage technique considering the characteristics of the extrusion die. Ideal elastoplastic autofrettage model was established and the stress formulae of three loading procedures were derived and the theoretical calculation method of the maximum autofrettage pressure and working load was put forward. The simulations of stress distribution and the inwall displacement of the autofrettaged extrusion die were performed using MARC finite element software, and the results coincided well with the theoretical derivations. It was observed that t

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2

Li, Hong Jun, Xun Huang, Di Liu, and Qiang Ding. "Fatigue Evaluation of Autofrettaged Thick-Walled Cylinders with a Radial Cross-Bore." Advanced Materials Research 1025-1026 (September 2014): 104–11. http://dx.doi.org/10.4028/www.scientific.net/amr.1025-1026.104.

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The fatigue life of autofrettaged thick-walled cylinders with a radial cross-bore is investigated by applying inelastic finite element analysis with cyclic pressure loading. A non-linear kinematic hardening model considering bauschinger effect is used for determining cyclic plastic strain ranges in fatigue evaluations. A macro is written in ANSYS to calculate the equivalent alternating stress intensity, based on the ASME Boiler and Pressure Vessel Code. For a specific cyclic load level, a distinct optimum autofrettage pressure is identified by plotting autofrettage pressure against the equival

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3

Hu, Chengliang, Fengyu Yang, Zhen Zhao, and Fan Zeng. "An alternative design method for the double-layer combined die using autofrettage theory." Mechanical Sciences 8, no. 2 (2017): 267–76. http://dx.doi.org/10.5194/ms-8-267-2017.

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Abstract. The double-layer combined die is used for its longer life in forging. Autofrettage is a well-known elastic–plastic technology that increases the durability of thick-walled cylinders. This study explores an alternative design method of the double-layer combined die using autofrettage theory. An analytical solution for the autofrettage process of the double-layer combined die is obtained based on Lamé's equation. The relationship between the autofrettage pressure and the yield radius of the die insert is obtained, and expressions of residual stresses and displacements, which are direct

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4

Jahed, Hamid, Babak Ahmadi Moghadam, and Mojtaba Shambooli. "Re-Autofrettage." Journal of Pressure Vessel Technology 128, no. 2 (2005): 223–26. http://dx.doi.org/10.1115/1.2172619.

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Loading, unloading, and reloading behavior of high-strength steel AISI 4340 (with yield strength of 1080MPa) has been measured using the round bar specimen and method described in (Jahad, H., and Ghanbari, G., 2003, ASME J. Pressure Vessel Technol., 125, pp. 321–325). Tests were conducted at plastic strains up to 3.4% for unloading and reloading. Re-autofrettage is the process of reapplication of overload pressure on an already autofrettaged tube. The question of whether reautofrettage results in a more beneficial compressive stress distribution and, therefore, in extension of life is examined

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5

Perl, M., C. Levy, and V. Rallabhandy. "The Influence of the Bauschinger Effect on 3D Stress Intensity Factors for Internal Radial Cracks in a Fully or Partially Autofrettaged Gun Barrel." Journal of Pressure Vessel Technology 128, no. 2 (2005): 233–39. http://dx.doi.org/10.1115/1.2172622.

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The influence of the Bauschinger effect (BE) on the three-dimensional, mode I, stress intensity factor (SIF) distributions for arrays of radial, internal, surface cracks emanating from the bore of a fully or partially autofrettaged thick-walled cylinder is investigated. A thorough comparison between the prevailing SIFs for a “realistic” (Bauschinger effect dependent autofrettage (BEDA)) and those for an “ideal” (Bauschinger effect independent autofrettage (BEIA)) is done. The three-dimensional (3D) analysis is performed via the finite element method and the submodeling technique, employing sin

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6

Perl, M., and R. Arone´. "An Axisymmetric Stress Release Method for Measuring the Autofrettage Level in Thick-Walled Cylinders—Part I: Basic Concept and Numerical Simulation." Journal of Pressure Vessel Technology 116, no. 4 (1994): 384–88. http://dx.doi.org/10.1115/1.2929605.

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A new experimental method for measuring the level of autofrettage in thick-walled cylinders is suggested. The method is based on measuring the hoop-strain while axisymmetrically releasing the residual stress field prevailing in the cylinder’s wall. A parametric study of the proposed experimental procedure conducted by a finite element simulation yields a simple empirical relation, which readily enables determining the actual autofrettage level from the strain measurements. This relation is found to be practically unique for all relevant cases, i.e., cylinders with radii ratios of b/a=1.6÷2.2 a

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7

Perl, M., and A. Nachum. "3-D Stress Intensity Factors for Internal Cracks in an Overstrained Cylindrical Pressure Vessel—Part I: The Effect of Autofrettage Level." Journal of Pressure Vessel Technology 122, no. 4 (2000): 421–26. http://dx.doi.org/10.1115/1.1310162.

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Three-dimensional, mode I, stress intensity factor (SIF) distributions for arrays of internal surface cracks emanating from the bore of an autofrettaged thick-walled cylinder are evaluated in Part I of this paper. The 3-D analysis is performed via the finite element (FE) method and the submodeling technique, employing singular elements along the crack front. The autofrettage residual stress field is simulated using an equivalent temperature field. More than 200 different crack configurations were analyzed. SIFs for numerous crack arrays (n=1–180 cracks), a wide range of crack-depth-to-wall-thi

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8

Parker, Anthony P., and David P. Kendall. "Residual Stresses and Lifetimes of Tubes Subjected to Shrink Fit Prior to Autofrettage." Journal of Pressure Vessel Technology 125, no. 3 (2003): 282–86. http://dx.doi.org/10.1115/1.1593074.

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There is increasing interest in the use of compound cylinders that combine shrink fit and autofrettage, taking account of Bauschinger effect. Previous work has analyzed material removal from a plain, autofrettaged cylinder and the application of an external pressure or shrink to a previously autofrettaged plain tube. In this paper a different design philosophy is examined, namely the shrink fitting of two tubes prior to autofrettage. Such a process is shown to be beneficial in inhibiting loss of near-bore compressive residual hoop stress due to Bauschinger effect and thereby increasing calcula

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9

Parker, Anthony P. "Bauschinger Effect Design Procedures for Compound Tubes Containing an Autofrettaged Layer." Journal of Pressure Vessel Technology 123, no. 2 (2000): 203–6. http://dx.doi.org/10.1115/1.1331281.

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Autofrettage is used to introduce advantageous residual stresses into pressure vessels. The Bauschinger effect can produce less compressive residual hoop stresses near the bore than are predicted by “ideal” autofrettage solutions. A design procedure was recently proposed which models material removal from the bore or outside diameter of a single, plain autofrettaged tube in the presence of Bauschinger effect. This paper extends the procedure to model the addition of pressure or of material (via shrink-fit) to the tube, providing associated residual stress profiles following various amounts of

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10

Koh, Seung Kee. "Residual Stress Evaluation and Its Effects on the Fatigue Life of an Autofrettaged Tube." Key Engineering Materials 321-323 (October 2006): 699–702. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.699.

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The theoretical residual stresses in the autofrettaged tube were calculated, considering Bauschinger effect caused by the reverse yielding while removing autofrettage pressure. Actual residual stresses were measured by using X-ray diffraction analysis, and compared with the theoretical calculations. From the tension-compression tests, however, the tube steel showed a significant Bauschinger effect, depending on the plastic strain prior to unloading. Fatigue crack growth life of the tube was evaluated by integrating the crack growth rate equation. Stress intensity factor of an inside crack at t

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11

Hu, Zhong. "Design of two-pass swage autofrettage processes of thick-walled cylinders by computer modeling." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 4 (2018): 1312–33. http://dx.doi.org/10.1177/0954406218770221.

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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 ca

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12

Alexandrov, Sergei, Elena Lyamina, Jong-Ning Aoh, and Yeau-Ren Jeng. "Description of Residual Stresses in Autofrettaged Open-Ended Cylinders Made of High-Strength Steel." Materials 13, no. 13 (2020): 2940. http://dx.doi.org/10.3390/ma13132940.

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The elastic range in loading–unloading processes is often reduced with a Bauschinger effect. This material property may have a high impact on residual stresses and, as a result, on the performance of autofrettaged cylinders under service conditions. The objective of the present paper is to demonstrate this impact using a material model that accounts for the response of typical high-strength steel. The solution is semi-analytic and, therefore, can be used for fast and accurate analysis of the process of autofrettage. A numerical example illustrates the general solution. This example shows that

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13

Huang, Xiao Ping, and Weicheng Cui. "Determination of Residual Stress Distribution in Autofrettaged Tube Based on Modified Yielding Criterion and Tensile-Compressive Curve of Material." Materials Science Forum 490-491 (July 2005): 91–96. http://dx.doi.org/10.4028/www.scientific.net/msf.490-491.91.

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An autofrettage model considering the material strain-hardening behavior and the Bauschinger effect, based on the actual tensile–compressive curve of material and modified yield criterion, has been proposed. The analytic expressions of residual stress distribution and the autofrettage pressure have been obtained. This model has stronger curve fitting ability, nearly all of the strain-stress curves of materials used in making autoefrettage tubes can be fitted well by this model, and each of those models based on the simplified strain hardening relationship of material is a special case of the m

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14

Ragab, A. R., A. T. Abbas, and S. A. Khorshied. "Experimental verification of the autofrettage process for thick-walled tubes." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 215, no. 6 (2001): 727–36. http://dx.doi.org/10.1243/0954406011523974.

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The success of the autofrettage process applied to thick-walled tubes is determined in industry via a control chart representing the measured permanent diametral expansions versus the yield stress of the material. The widely used acceptance limits are due to Hill's analysis of the problem. An experimental investigation showed that the above limits might lead to refusal of a substantial number of autofrettaged tubes. By considering the separate effects of hardening, the Bauschinger factor, reverse yielding, anisotropy and geometrical eccentricity, the need for a more realistic material model is

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15

Levy, C., M. Perl, and Q. Ma. "The Influence of Finite Three-Dimensional Multiple Axial Erosions on the Fatigue Life of Partially Autofrettaged Pressurized Cylinders." Journal of Pressure Vessel Technology 125, no. 4 (2003): 379–84. http://dx.doi.org/10.1115/1.1616582.

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Erosion geometry effects on the mode I stress intensity factor (SIF) for a crack emanating from the farthest erosion’s deepest point in a multiply, finite-length or full-length eroded, partially autofrettaged, pressurized, thick-walled cylinder is investigated. The problem is solved via the FEM method. Autofrettage, based on von Mises’ yield criterion, is simulated by thermal loading and SIFs are determined by the nodal displacement method. SIFs were evaluated for a variety of relative crack depths, a/t=0.01-0.30 and crack ellipticities, a/c=0.5-1.5 emanating from the tip of the erosion of var

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16

Chen, Ai Jun, Zi Chu Cha, and Zhi Qun Wang. "Research on Fatigue Life of Autofrettaged Thick-Walled Cylinder in Probabilistic Fracture Mechanics." Applied Mechanics and Materials 249-250 (December 2012): 36–39. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.36.

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Based on the theory of probabilistic fracture mechanics and Monte Carlo simulation, reliability analysis method for fatigue life of autofrettaged thick-walled cylinder was given. The forms of fatigue cracks in bore of autofrettaged thick-walled cylinder were considered as semi-elliptical cracks. The autofrettage residual stress solution was suitable for the thick-walled cylinder made of steel with strain hardening and Bauschinger effect. The stress intensity factors of thick-walled cylinder were calculated according to weight function method. The analysis of the examples showed that lognormal

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17

Perl, M., and R. Arone´. "Stress Intensity Factors for a Radially Multicracked Partially Autofrettaged Pressurized Thick-Walled Cylinder." Journal of Pressure Vessel Technology 110, no. 2 (1988): 147–54. http://dx.doi.org/10.1115/1.3265579.

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Mode I stress intensity factors for crack arrays of up to 1024 equal radial cracks originating at the inner surface of a partially autofrettaged, pressurized thick-walled cylinder are evaluated. Both stress intensity factors i.e., KIp due to the pressurization, and the negative KIA due to the compressive residual stresses, are calculated for numerous crack arrays (n = 2–1024), a wide range of nondimensional crack lengths (1/a = 0.005–0.625), and various levels of autofrettage (ε = 30, 60, 100 percent) via the finite element method. The obtained results emphasize the notable significance of the

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18

Hameed, Amer, R. D. Brown, and John Hetherington. "A Study of the Residual Stress Distribution in an Autofrettaged, Thick-Walled Cylinder With Cross-Bore." Journal of Pressure Vessel Technology 126, no. 4 (2004): 497–503. http://dx.doi.org/10.1115/1.1811111.

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It may be necessary to provide a radial opening such as gas evacuator holes, or an opening to operate the unlocking of the bolt mechanism by means of exhaust gases, in a gun barrel, which is a thick walled cylinder. A three dimensional finite element analysis has been performed to evaluate the effect of introducing a radial cross-bore in an autofrettaged thick-walled cylinder. From the analysis of the cross-bored autofrettaged cylinder, it was observed that there is a severe localized change in the residual stress profile in the vicinity of the cross-bore. The residual circumferential stress i

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19

Levy, C., M. Perl, and Q. Ma. "Erosions and Their Effect on the Fatigue Life of Thick Walled, Autofrettaged, Pressurized Vessels." Journal of Pressure Vessel Technology 125, no. 3 (2003): 242–47. http://dx.doi.org/10.1115/1.1593698.

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This paper summarizes the results that have been found in evaluating the effect of erosions on thick walled, autofrettaged, pressurized, cracked vessels. The problem is solved numerically via the FEM method. Autofrettage, based on von Mises yield criterion, is simulated by thermal loading and stress intensity factors (SIF’s) are determined by the nodal displacement method. SIF’s were evaluated for a variety of relative crack depths a/t and crack ellipticities a/c emanating from the tip of the erosion of various geometries, namely, (a) semi-circular erosions of small relative depths of the cyli

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20

Huang, X. P., and W. C. Cui. "Effect of Bauschinger Effect and Yield Criterion on Residual Stress Distribution of Autofrettaged Tube." Journal of Pressure Vessel Technology 128, no. 2 (2005): 212–16. http://dx.doi.org/10.1115/1.2172621.

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Many analytical and numerical solutions for determining the residual stress distribution in autofrettaged tube have been reported. The significance of the choice of yield criterion, the Bauschinger effect, strain hardening, and the end conditions on the predicted residual stress distribution has been discussed by many authors. There are some different autofrettage models based on different simplified material strain-hardening behaviors, such as a linear strain-hardening model, power strain-hardening model, etc. Those models give more accurate predictions than that of elastic–perfectly plastic

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21

Koh, S. K., and R. I. Stephens. "Fatigue Life Prediction of an Autofrettaged Thick-Walled Pressure Vessel With an External Groove." Journal of Pressure Vessel Technology 113, no. 3 (1991): 368–74. http://dx.doi.org/10.1115/1.2928768.

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An autofrettaged thick-walled pressure vessel with an external groove subjected to a pulsating internal pressure can have fatigue failures at the external groove root due to the combination of tensile autofrettage residual stress, operating stress, and stress concentration. To predict the fatigue life of the autofrettaged thick-walled pressure vessel with an external groove, the local strain approach was applied. The residual stress distribution due to autofrettage and the operating stress distribution due to internal pressure were determined using finite element analysis which resulted in the

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22

Tan, C. L. "Stress redistributions in thick-walled cylinders due to the introduction of a cross-bore after autofrettage." Journal of Strain Analysis for Engineering Design 21, no. 3 (1986): 177–83. http://dx.doi.org/10.1243/03093247v213177.

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The numerical boundary integral equation method for three-dimensional elastostatics is employed for the stress analysis of a thick-walled cylinder with a radial cross-bore. The geometries considered are for cylinders with radius ratio k = 2.0 and 2.25, and with the cross-bore radius one-quarter that of the cylinder bore. Results showing the elastic stress distributions in an internally pressurized un-autofrettaged cylinder with the radial hole are presented. Using the classical superposition principle, the stress redistributions in partially autofrettaged tubes, due to the introduction of a cr

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23

Parker, A. P., J. H. Underwood, and D. P. Kendall. "Bauschinger Effect Design Procedures for Autofrettaged Tubes Including Material Removal and Sachs’ Method." Journal of Pressure Vessel Technology 121, no. 4 (1999): 430–37. http://dx.doi.org/10.1115/1.2883726.

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Autofrettage is used to introduce advantageous residual stresses into pressure vessels and to enhance their fatigue lifetimes. The Bauschinger effect serves to reduce the yield strength in compression as a result of prior tensile plastic overload and can produce lower compressive residual hoop stresses near the bore than are predicted by “ideal” autofrettage solutions (elastic/perfectly plastic without Bauschinger effect). A complete analysis procedure is presented which encompasses representation of elastic-plastic uniaxial loading material behavior and of reverse-loading material behavior as

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24

Yuan, Ge Xia, Hong Zhao Liu, Yu Qiang Han, Ying Xiang Zhao, and Juan Ping Wang. "Optimum Design of a Kind of Split Type Compound Vessel Used in Ultrahigh Pressure Technology." Advanced Materials Research 148-149 (October 2010): 1458–63. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.1458.

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To enhance multilayer pressure vessels’ load bearing capacity, the paper presented a kind of split type compound vessel which employed split, shrink-fit and autofrettage techniques simultaneously. The vessel consists of a split layer made of sintered carbide, and an outer two-layer whole cylinder treated with autofrettage and shrink-fit. The mathematic model for the optimization design of the split type vessels was build based on stress analysis of each layer. In the model, the wall thickness of compound vessels is taken as an objective function; thickness of each layer, shrink-fit pressures,

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Perl, M., and D. Alperowitz. "The Effect of Crack Length Unevenness on Stress Intensity Factors Due to Autofrettage in Thick-Walled Cylinders." Journal of Pressure Vessel Technology 119, no. 3 (1997): 274–78. http://dx.doi.org/10.1115/1.2842304.

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The effect of crack length unevenness on the mode I stress intensity factors (SIFs) for large uniform arrays of radial cracks of unequal depth in fully or partially autofrettaged thick-walled cylinders is investigated. The analysis is based on the previously proposed “two-crack-length level model.” Values for KIA—the SIF due to the compressive residual stress field—for various crack arrays bearing n1 = n2 = 2−512 cracks, a wide range of nondimensional crack lengths l1/a=0.01−0.1, and numerous levels of autofrettage ε = 30−100 percent are evaluated by the finite element method for a cylinder of

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Badr, E. A., J. R. Sorem, and S. M. Tipton. "Residual Stress Estimation in Crossbores With Bauschinger Effect Inclusion Using FEM and Strain Energy Density." Journal of Pressure Vessel Technology 121, no. 4 (1999): 358–63. http://dx.doi.org/10.1115/1.2883715.

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Crossbore intersections in liquid ends of positive displacement pumps (PDPs) have regions with high stress concentration. Due to the cyclic loading that occurs in most PDPs, these stress concentration points are susceptible to fatigue cracking. In order to prolong their life, the liquid ends are often overpressurized (autofrettaged), thus inducing beneficial compressive hoop stresses in these critical regions upon removal of the autofrettage pressure. This autofrettage process drives the region of high stress concentration beyond the elastic limit and well into the elastic-plastic region. Elas

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Perl, M., and A. Nachum. "3-D Stress Intensity Factors for Internal Cracks in an Overstrained Cylindrical Pressure Vessel—Part II: The Combined Effect of Pressure and Autofrettage." Journal of Pressure Vessel Technology 123, no. 1 (2000): 135–38. http://dx.doi.org/10.1115/1.1310163.

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K IA and KIP stress intensity factors (SIF) for three-dimensional semi-elliptical, surface, radial cracks prevailing in a pressurized or autofrettaged thick-walled cylinder were evaluated and discussed in Part I of this paper and in Perl et al. 1996, “Three-Dimensional Interaction Effects in an Internally Multicracked Pressurized Thick-Walled Cylinder—Part I: Radial Surface Cracks,” AMSE J. Pressure Vessel Technol. 118, pp. 357–363), respectively. These SIFs were calculated for a wide range of configurations: for cracks pertaining to large arrays of up to 180 cracks, with ellipticities of a/c=

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Perl, M., and J. Perry. "An Experimental-Numerical Determination of the Three-Dimensional Autofrettage Residual Stress Field Incorporating Bauschinger Effects." Journal of Pressure Vessel Technology 128, no. 2 (2005): 173–78. http://dx.doi.org/10.1115/1.2172959.

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Autofrettage of large-caliber gun barrels is used to increase the elastic strength of the tube and is based on the permanent expansion of the cylinder bore, using either hydraulic pressure or an oversized swage mandrel. The theoretical solution of the autofrettage problem involves different yield criteria, the Bauschinger effect, and the recalculation of the residual stress field post barrel’s machining. Accurate stress-strain data and their appropriate numerical representations are needed as input for the numerical analysis of the residual stress field due to autofrettage. The purpose of the

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Ma, Xiu Hua. "Research on the Best Autofrettage Pressure of Ultra-High Pressure Valve Body." Key Engineering Materials 667 (October 2015): 524–29. http://dx.doi.org/10.4028/www.scientific.net/kem.667.524.

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This paper takes the ultra-high pressure (103.5MPa) valve body as the research object and adopts the finite element method to perform simulation analysis on the three bearing conditions involved with the valve body, i.e., autofrettage pressure, discharge and working pressure. The simulation shows identical results with the theoretical calculation. The relationship between the maximum equivalent stress and autofrettage pressure during the operation of the valve is obtained from the simulation results; therefore the best autofrettage pressure is determined. When determining the maximum value of

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Lee, Young Shin, Jae Hyun Park, Jae Hoon Kim, Ki Up Cha, and Suk Kyun Hong. "Bauschinger Effect’ Influence on the Componud Cylinder Containing an Autofrettaged Layer." Key Engineering Materials 345-346 (August 2007): 149–52. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.149.

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Autofrettage is used to introduce advantageous residual stresses into cylinders. The Bauschinger effect can produce less compressive residual hoop stresses near the bore than are predicted “ideal” autofrettage solutions. A723 steel is used for compound cylinder. This paper extends the analysis to material the addition of pressure or of shrink-fitting to the cylinders, providing associated residual stress profiles following various amounts of further yielding due to a net external pressure. The Bauschinger effects for “realistic” – Bauschinger effect dependent autofrettage are obtained. The 2-D

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Rupali. "Thermo-Mechanical Autofrettage Process of Spherical Vessel." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 3 (2020): 1109–14. https://doi.org/10.35940/ijeat.B4098.029320.

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In this analysis results of Elastic-plastic stress distributions in a spherical pressure vessel with ThermoMechanical loads are discussed. Results of study are obtained with Finite element (FE) analysis. A quarter of pressure vessel is considered and modeled with all realistic details. In addition to presenting the stress distribution of the pressure vessel, in this work the effects thermo-Mechanical autofrettage on different limit strength for spherical pressure vessels are investigated. The effect of changing the load and various geometric parameters is investigated. Consequently, it can be

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Gao, Yuehao, Xuesheng Wang, and Qinzhu Chen. "Autofrettage design and study of ultrahigh-pressure emergency pressure relief valves." Journal of Physics: Conference Series 2992, no. 1 (2025): 012012. https://doi.org/10.1088/1742-6596/2992/1/012012.

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Abstract The problems encountered in the development of ultra-high-pressure valves were analyzed, and the valve body of an ultra-high-pressure emergency relief valve was chosen as the research object, which was subjected to finite element static analysis to find out the location of the stress concentration of the valve body structure. Based on the Bauzinger effect of the material, the autofrettage process of the valve body is simulated and analyzed, and the stress of the valve body during the autofrettage process is analyzed, which shows that the autofrettage can improve the distribution of th

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Yang, Feng Ling, and Shi Jin Zhang. "Exploring Autofrettage Process to Improve the Fatigue Life on High-Pressure Cylinder." Applied Mechanics and Materials 457-458 (October 2013): 518–21. http://dx.doi.org/10.4028/www.scientific.net/amm.457-458.518.

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Autofrettage process is now widely used to improve fatigue strength of high pressure components. This paper focuses on the fatigue life improvement of the high-pressure cylinder treated by autofrettage process. In this process, a high pressure cylinder treated by autofrettage process has been simulated by using FEA software, and surface variation of the cylinder has been analyzed. To further understand this process, theoretical fatigue analysis has also been carried out.

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Greuling, S., T. Seeger, and M. Vormwald. "Autofrettage innendruckbelasteter Bauteile." Materialwissenschaft und Werkstofftechnik 37, no. 3 (2006): 233–39. http://dx.doi.org/10.1002/mawe.200500994.

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Parker, A. P., G. P. O’Hara, and J. H. Underwood. "Hydraulic Versus Swage Autofrettage and Implications of the Bauschinger Effect." Journal of Pressure Vessel Technology 125, no. 3 (2003): 309–14. http://dx.doi.org/10.1115/1.1593079.

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A hybrid method is presented which permits calculation of residual stresses in a swage autofrettaged tube including Bauschinger effect. The results are generally supported by three types of available experimental evidence by comparing “equivalent” swage and hydraulic autofrettage tubes having the same level of overstrain. Radial slitting of the swaged tube is predicted to show a greater opening angle than its hydraulic equivalent. Fatigue lifetime of the swaged tube is predicted to be significantly higher than the hydraulic case. Re-pressurization of the equivalent tubes is predicted to produc

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Zhang, Yu Xian, Fang Yao, and Xiao Shuang Men. "Design of Ultra-High Pressure Cylinders Based on Principle of Autofrettage." Applied Mechanics and Materials 142 (November 2011): 24–27. http://dx.doi.org/10.4028/www.scientific.net/amm.142.24.

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Through the analysis of stress in ultra high-pressure cylinders, found that its stress distribution is very uneven. In order to use the principle of autofrettage for improving design of the cylinders, first with Faupel-Furbe formula to calculate estimates of diameter ratio, and thus are inner and outer diameter of the cylinder block. Then the cylinder is determined parameter of autofrettage on the cylinder such as the optimum radius of elastic-plastic junction and the optimum autofrettage pressure. Finally, analysis and calculation of stress in improved design cylinder, the results show that t

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Liu, Dong Xia, Li Liang, and Xing Lei Bao. "Analysis of Optimal Autofrettage Pressure on CFRP Pressure Vessels Using ANSYS." Applied Mechanics and Materials 331 (July 2013): 184–88. http://dx.doi.org/10.4028/www.scientific.net/amm.331.184.

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For the pressure vessels made of high-strength Carbon Fiber Reinforced Plastics (CFRP) and Aluminum liner, the strength is provided by the CFRP, but the liner leak is always the bottleneck of the vessels’ safety. The carrying capacity and anti-fatigue ability of CFRP pressure vessels is largely depend on the elastic deformation range. In this research the principle of autofrettage is analyzed, the mechanical character of a certain 2 liters pressure vessel is analyzed using finite element software ANSYS, and the optimal autofrettage pressure is calculated by optimization method. The results sho

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Perl, M. "The Change in Overstrain Level Resulting From Machining of an Autofrettaged Thick-Walled Cylinder." Journal of Pressure Vessel Technology 122, no. 1 (1999): 9–14. http://dx.doi.org/10.1115/1.556145.

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An analytical model for predicting the level of autofrettage following either inner, outer, or combined machining of a gun barrel is developed based on Hill’s (Hill, R., 1950, The Mathematical Theory of Plasticity, Clarendon Press, Oxford, U.K.) solution for the autofrettage residual stress field. The analysis results in very simple algebraic expressions for the post-machining level of autofrettage in terms of the original level induced in the blank tube. In parallel, a finite element analysis of the machining process is performed in which the residual stress field is simulated by an equivalen

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Lin, X. B., and R. A. Smith. "Stress intensity factors for semi-elliptical internal surface cracks in autofrettaged thick-walled cylinders." Journal of Strain Analysis for Engineering Design 32, no. 5 (1997): 351–63. http://dx.doi.org/10.1243/0309324971513472.

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Stress intensity factors for internal semi-elliptical surface cracks in autofrettaged cylinders with and without internal pressures applied are presented. The three-dimensional finite element based displacement method with the crack tip square-root singularity of stresses and strains simulated is used to evaluate the stress intensity factors along the crack front. Both allowing and disallowing the overlapping of crack faces are considered in this investigation, the latter being simulated by considering crack surface contact through a kind of interface element introduced into the cracked area.

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Zhang, Guo, Haiyang Zhu, Qi Wang, et al. "Buckling analysis of thin-walled metal liner of cylindrical composite overwrapped pressure vessels with depressions after autofrettage processing." Science and Engineering of Composite Materials 28, no. 1 (2021): 540–54. http://dx.doi.org/10.1515/secm-2021-0051.

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Abstract The cylindrical filament wound composite overwrapped pressure vessels (COPV) with metal liner has been widely used in spaceflight due to their high strength and low weight. After the autofrettage process, the plastic deformation of the metal liner is constrained by composite winding layers, which introduce depressions to the metal liner that causes local buckling. To predict the local buckling of the inner liner with depressions of the pressure vessel after the autofrettage process, a local buckling analysis method for the metal liner of COPV was developed in this article. The finite

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Altenbach, H., GI Lvov, K. Naumenko, and V. Okorokov. "Consideration of damage in the analysis of autofrettage of thick-walled pressure vessels." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 20 (2016): 3585–93. http://dx.doi.org/10.1177/0954406215615908.

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In this study, the influence of material damage and the Bauschinger effect on the autofrettage of thick-walled pressure vessels is investigated. Constitutive equations for the elasto-plastic deformation and damage processes are presented. Boundary value problems for a thick-walled cylinder and for a thick-walled sphere of constant thickness are formulated. Computations are preformed to find the optimum autofrettage pressure, for which the equivalent stresses in the vessel take the minimum value under process conditions. Furthermore, residual stress fields after the autofrettage are analyzed. T

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Fällgren, Carl, Thomas Beier, Michael Vormwald, and Andreas Kleemann. "Autofrettage of component-like ultra high Strength Steel Specimens with intersecting Holes." MATEC Web of Conferences 349 (2021): 04004. http://dx.doi.org/10.1051/matecconf/202134904004.

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This work is primarily concerned with the fatigue life of high-pressure-bearing components with intersecting holes, typically used in Diesel engine fuel injection systems. The investigation focuses on specimens with intersecting holes that have undergone the process of Autofrettage (single mechanical overload), which is typically used to extend the fatigue life of components loaded by cyclic internal pressure. The resulting residual stress distribution thus influences the fatigue failure and especially the crack propagation behaviour of the components. In previous works, results showed that be

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Sun, Lihua, Rongxuan Zhou, Guiqin Li, Jianing Li, and Peter Mitrouchev. "Simulation Research on Residual Stress of Swage Autofrettage-processed High-Pressure Cylinder." Journal of Physics: Conference Series 2587, no. 1 (2023): 012088. http://dx.doi.org/10.1088/1742-6596/2587/1/012088.

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Abstract The vital component of the high-pressure pump is the high-pressure cylinder, which undergoes pulsating cyclic loads during operation. This exposure can lead to fatigue cracking and limit the pump’s overall performance. To address this issue, a swage autofrettage treatment method for the high-pressure cylinder is proposed based on the principles of autofrettage technology. The structure parameters of the mandrel are designed to optimize its role in the treatment process. Subsequently, a swage autofrettage simulation model is established, considering the Bauschinger effect to analyze th

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Zhu, Ruilin, and Jinlai Yang. "Autofrettage of thick cylinders." International Journal of Pressure Vessels and Piping 75, no. 6 (1998): 443–46. http://dx.doi.org/10.1016/s0308-0161(98)00030-1.

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Lvov, G. I., and V. O. Okorokov. "Experimental Study of Autofrettage." Strength of Materials 50, no. 2 (2018): 270–80. http://dx.doi.org/10.1007/s11223-018-9968-7.

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He, Q., X. K. Gao, and C. J. Zhou. "Study on the Application of Ultrasonic Nondestructive Testing Method for Residual Stress of Autofrettaged Barrel." Journal of Physics: Conference Series 2460, no. 1 (2023): 012054. http://dx.doi.org/10.1088/1742-6596/2460/1/012054.

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Abstract Gun barrel under high bore pressure in the process of gun launching. The tangential stress was produced by autofrettaged technology, which can greatly improve the bearing capacity of barrel. The ultrasonic nondestructive testing method was used to design the residual stress testing device of barrel bore. The tangential residual stress of 125 mm barrel at certain depth from the inner surface was measured. The finite element model considering hydraulic autofrettage and finish machining of inner and outer surface of barrel was established, and the simulation data was compared with test d

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Parker, Anthony P. "Autofrettage of Open-End Tubes—Pressures, Stresses, Strains, and Code Comparisons." Journal of Pressure Vessel Technology 123, no. 3 (2000): 271–81. http://dx.doi.org/10.1115/1.1359209.

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Autofrettage is used to introduce advantageous residual stresses into pressure vessels. The Bauschinger effect can produce less compressive residual hoop stresses near the bore than are predicted by “ideal” autofrettage solutions. A recently developed numerical analysis procedure is adopted and extended. The ratio of calculated autofrettage pressure (numerical)/ideal autofrettage pressure (Tresca criterion and plane stress) is calculated and verified against available solutions. The case of open-end conditions based upon von Mises and engineering plane strain (constant axial strain with zero n

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Parker, Anthony P. "A Re-Autofrettage Procedure for Mitigation of Bauschinger Effect in Thick Cylinders." Journal of Pressure Vessel Technology 126, no. 4 (2004): 451–54. http://dx.doi.org/10.1115/1.1806446.

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A manufacturing procedure for enhancing residual stresses and thereby improving fatigue lifetime and fracture resistance of pressure vessels is proposed. The procedure involves initial autofrettage; one or more “heat soak plus autofrettage” sequences and an optional final heat soak. Stresses are calculated numerically for traditional, single autofrettage and compared with those created by the new procedure. The loss of bore compressive hoop stress due to Bauschinger effect is predicted to be significantly reduced. Associated fatigue lifetime calculations indicate that life may be improved by a

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Li, Shangqing, Chunguang Zhang, Ye Wu, Yu Wang, Xiaochen Yu, and Lei An. "Fatigue and Autofrettage Analysis of Steel Sleeve Based on Precision Fit under Ultra High Pressure." Journal of Physics: Conference Series 2845, no. 1 (2024): 012009. http://dx.doi.org/10.1088/1742-6596/2845/1/012009.

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Abstract In order to ensure precision fit between steel sleeve and plunger, copper sleeve and the other parts of the ultra high pressure plunger pump, as well as increase the fatigue life of steel sleeve, this paper made the analysis of work process and fatigue life of ultra high pressure autofrettage steel sleeve of plunger pump based on both analytical method and FEM. The elastic-plastic boundary radius, radial stress and plastic zone displacement were obtained based on the elastic-plastic mechanics analysis of ultra high pressure steel sleeve. The functional relationship built related to pr

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Parker, Anthony P., and Choon-Lai Tan. "Stress Intensity Factors for Internal Straight and Curved-Fronted Cracks in Thick Cylinders." Journal of Pressure Vessel Technology 128, no. 2 (2006): 227–32. http://dx.doi.org/10.1115/1.2172618.

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Fatigue and leak-before-break calculations for a pressure vessel require knowledge of the stress intensity factor at the deepest point of a straight- or curved-fronted (semi-elliptical) surface crack emanating from the bore of an internally pressurized, autofrettaged thick cylinder. A limited number of available solutions is curve fitted. The concept of a tube equivalent plate (TEP), which exhibits crack-constraint characteristics matching those of a thick cylinder, is developed, and the resulting equations are curve fitted. Ratios of the TEP stress intensity factor results are then used to in

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