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Influence Of Bauschinger Effect On Residual Stress And Fatigue Lifetimes In Autofrettaged Thick Walled Cylinders
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Book Synopsis Influence of Bauschinger Effect on Residual Stress and Fatigue Lifetimes in Autofrettaged Thick-Walled Cylinders by : AP. Parker
Download or read book Influence of Bauschinger Effect on Residual Stress and Fatigue Lifetimes in Autofrettaged Thick-Walled Cylinders written by AP. Parker and published by . This book was released on 1999 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work addresses the influence of Bauschinger effect upon residual stresses and associated fatigue lifetimes for pressurized, autofrettaged thick cylinders.The model employed allows for the variation with radius of Bauschinger Effect Factor (BEF) thoughout the autofrettaged tube since the percentage plastic strain, which determines BEF, will vary from a maximum value at the bore to zero at the elastic-plastic interface.
Book Synopsis Fatigue and Fracture Mechanics by : Tina Louise Panontin
Download or read book Fatigue and Fracture Mechanics written by Tina Louise Panontin and published by ASTM International. This book was released on 1999 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of the Bauschinger Effect on Residual Stress and Fatigue Lifetimes in Autofrettaged Thick-Walled Cylinders by :
Download or read book Influence of the Bauschinger Effect on Residual Stress and Fatigue Lifetimes in Autofrettaged Thick-Walled Cylinders written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work addresses the influence of Bauschinger effect upon residual stresses and associated fatigue lifetimes for pressurized, autofrettaged thick cylinders. The model employed allows for the variation with radius of Bauschinger Effect Factor (REF) throughout the autofrettaged tube since the percentage plastic strain, which determines BEF, will vary from a maximum value at the bore to zero at the elastic plastic interface. Accounting for BEF variability, it is demonstrated that the residual compressive hoop stress at the inner radius of the tube reaches a maximum value at the percentage overstrain level below which reversed yielding does not occur. Existing experimental residual stress measurements from a variety of sources are shown to support this thesis. This value of overstrain may serve to maximize crack initiation lifetime in autofrettaged thick cylinders. For a tube with significant heat checking and associated initial crack like defects, it is necessary to consider fatigue crack growth rates governed by a crack growth law such as Paris's Law. For a tube of radius ratio 2.0 and at a value of approximately 40 percent overstrain, slightly in excess of that for the onset of reversed yielding, the fatigue lifetime exhibits a maximum value. Fatigue lifetimes achieve a maximum value at overstrain levels in which yielding reaches 1.4 times bore radius and are almost constant thereafter. Furthermore, such extended overstrain leads to a small increase in residual stress at the outside diameter (OD), thus increasing R ratio at that location and reducing fatigue lifetime for crack growth originating at the OD. Existing experimental lifetime measurements are shown to require the inclusion of BEF to properly account for these observed lifetimes.
Book Synopsis Prediction of Residual Stresses in an Autofrettaged Thick-Walled Cylinder by : P. C. T. Chen
Download or read book Prediction of Residual Stresses in an Autofrettaged Thick-Walled Cylinder written by P. C. T. Chen and published by . This book was released on 1983 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most of the earlier results for residual stresses are based on the assumption of elastic unloading. In this report, the prediction of residual stresses for the case of reverse yielding including the combined Baushinger and hardening effect will be reported for an autofrettaged thick-walled cylinder. The Bauschinger effect factor is varying as a function of overstrain. The strain-hardening effect is considered with different parameters used for loading and unloading process. The new results indicate that the influence of the combined Bauschinger and hardening effect on residual stress distribution is significant. (Author).
Book Synopsis Analytical and Experimental Methods for Residual Stress Effects in Fatigue by : Robert L. Champoux
Download or read book Analytical and Experimental Methods for Residual Stress Effects in Fatigue written by Robert L. Champoux and published by ASTM International. This book was released on 1988 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Influence of the Bauschinger Effect on Reverse Yielding of Thick-Walled Cylinders by : R. Vincent Milligan
Download or read book The Influence of the Bauschinger Effect on Reverse Yielding of Thick-Walled Cylinders written by R. Vincent Milligan and published by . This book was released on 1969 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Critical diameter ratios for reverse yielding of thick-walled cylinders are calculated, taking experimentally determined values of the Bauschinger Effect into account. The tangential residual stresses at the inside surface of the tube are then calculated based on the critical diameter ratios. It is shown that the theoretical residual stresses are reduced by 54 and 38 percent, based on the 0.1 and 0.2 percent offset yield strengths used in determining the Bauschinger Effect parameters for the high-strength, low-alloy steel used as an example for this study. (Author).
Book Synopsis Residual Stress in a Swage Autofrettaged Steel Cylinder with Semi-Circular Mid-Wall Channels by :
Download or read book Residual Stress in a Swage Autofrettaged Steel Cylinder with Semi-Circular Mid-Wall Channels written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray diffraction residual stress distribution analysis was performed for a swage autofrettaged, thick-walled, A723 steel compound cylinder with axial semi-circular mid-wall channels. Because of the existence of high stress gradient components in the stress distribution, the effect of spatial resolution and the x-ray beam spread function were investigated. Experimental stress measurements were compared with results from Tresca's model of a partially autofrettaged solid cylinder. Measured residual stresses were interpreted using an ABAQUS finite element model. Our experimental results verified most features of the predicted hoop stress distribution, including the high stress gradients and compressive stresses near the channel root areas. However, significantly reduced compressive stress levels were observed both near the bore and near the channel roots. An overestimate of fatigue lifetime could result if the reduction of compressive stresses observed experimentally were not taken into account. In solid autofrettaged cylinders, reduction of compressive stresses near the bore has been attributed to the Bauschinger effect. However, there is no analytical model incorporating the Bauschinger effect in the current geometry. This work demonstrated that the introduction of the semi-circular channels in a solid cylinder significantly modified the magnitude and location of stress fields. Both the bore and the channel roots are critical sites for stress concentration. Our analysis further determined that the channel roots were the most critical sites where cracks and failure should occur. Fatigue test results verified that cracking and failure occurred at the channel roots.
Book Synopsis Characterization of Residual Stresses in an Eccentric Swage Autofrettaged Thick-Walled Steel Cylinder by :
Download or read book Characterization of Residual Stresses in an Eccentric Swage Autofrettaged Thick-Walled Steel Cylinder written by and published by . This book was released on 1992 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the swage autofrettage process, partial autofrettage was achieved by driving an oversized mandrel through the cylinders to cause plastic deformation. In this work, we made experimental and theoretical investigations of residual stresses in a swaged asymmetric thick-walled cylinder with small wall variations. Hoop and radial residual stress distributions, as well as angular hoop stress variations at the inside and outside diameter of the cylinder, were determined by using a single-exposure position-sensitive scintillation x-ray diffraction detection system. Our experimental results were in good agreement with the residual stress distributions predicted from Tresca's hydraulic autofrettage model. Deviations of hoop residual stress at the bore may be attributed to Bauschinger's effect. Finite element analysis using ABAQUS code on a Convex supercomputer was used to model the swage autofrettage process. Small angular residual stress variations were predicted due to the eccentricity of the cylinder. The finite element model predictions of residual stress distribution were in general agreement with experimental results except near the bore. Preliminary results of an alternative finite element method showed a reduced compressive hoop stress near the bore, similar to the results obtained by assuming Bauschinger's effect. Residual Stress, Finite Element Analysis, Pressure Vessel, Reverse Yielding, Eccentric Cylinder, X-Ray Diffraction, Swage Autofrettage, Bauschinger's Effect, ABA US Code.
Book Synopsis Residual Stress Analysis in Swage Autofrettaged Thick-Walled Cylinders by Position-Sensitive X-Ray Diffraction Techniques by :
Download or read book Residual Stress Analysis in Swage Autofrettaged Thick-Walled Cylinders by Position-Sensitive X-Ray Diffraction Techniques written by and published by . This book was released on 1994 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental and theoretical investigations were made for swage autofrettage partially plastic ASTM A723 steel cylinders with an outside diameter (OD) to inside diameter (ID) ratio of 2.75 and 74 percent overstrain. Residual stress radial distribution and angular stress distribution around the bore were analyzed using two position-sensitive x-ray diffraction stress analyzers. Theoretical calculation was made by implementing an interactive, iterative Lotus Works spreadsheet residual stress model on an IBM PC. The model was based on the classical solution to the elastic-plastic deformation problem of a symmetric thick walled cylinder under internal pressure, including reverse yielding effect. Angular stress distribution data at the ID and OD indicated that non-axisymmetric deformation had occurred during yielding of the cylinders. Excellent agreement was obtained between experimental results and theoretical predictions, including the Bauschinger effect near the bore. By comparing experimental data with theoretical calculations for the 74 percent overstrained cylinders, the Bauschinger factor for the A723 steel was determined to be close to 0.5. Residual stress analysis for the entire cylinder is suggested in the future. Residual stress, Swage autofrettage, Bauschinger's effect, Position- sensitive stress analyzer, X-Ray diffraction, Pressure vessel, Reverse yielding, Plastic deformation.
Book Synopsis Proceedings of the ASME Pressure Vessels and Piping Conference--2005: High-pressure technology by :
Download or read book Proceedings of the ASME Pressure Vessels and Piping Conference--2005: High-pressure technology written by and published by . This book was released on 2005 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Autofrettage Processes by : Uday S Dixit
Download or read book Autofrettage Processes written by Uday S Dixit and published by CRC Press. This book was released on 2019-09-23 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Autofrettage Processes: Technology and Modeling deals with the technology and modeling of autofrettage processes, explaining the subject in a lucid manner. It highlights how the theory of plasticity and finite element modeling are applied in the modeling of autofrettage processes. Aimed at senior students of mechanical, production, automobile, and chemical engineering, it has the potential to directly benefit practicing engineers and industrials, owing to the inclusion of topics like thermal autofrettage. Key Features: Provides a general introduction to autofrettage Covers the application of theory of plasticity and finite element modeling of autofrettage processes Offers exposure to newer autofrettage processes that to date have not been implemented in industries, along with useful practical data
Book Synopsis Strengthening and Joining by Plastic Deformation by : Uday Shanker Dixit
Download or read book Strengthening and Joining by Plastic Deformation written by Uday Shanker Dixit and published by Springer. This book was released on 2018-06-05 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on strengthening and joining materials by means of plastic deformation, gathering extended research papers presented at the AIMTDR 2016 conference. Plastic deformation is used in materials processing to improve the strength of the material. For example, the rod/screw used to connect the cooker handle to the main body has to be strong and sustainable; such rods can be strengthened by plastic deformation (using multi-stage forming operations etc.). Similarly, joining by means of plastic deformation is highly valuable since it avoids the material and environmental degradation often caused by fusion welding processes. The book discusses various processing techniques in which plastic deformation is used to strengthen materials – e.g. in equal channel angular extrusion, autofrettage etc., or to join materials without melting them – e.g. in friction stir processing, riveting etc. Offering an extensive guide, the book includes chapters on roll bonding, equal channel angular pressing, autofrettage, friction stir processing/welding, magnetic pulse welding, and riveting – processes used to strengthen and join a variety of materials for lightweight applications and sustainable manufacturing. The contents of this book will be useful to researchers and practitioners alike.
Book Synopsis Advanced Materials, Structures and Mechanical Engineering by : H.M. Song
Download or read book Advanced Materials, Structures and Mechanical Engineering written by H.M. Song and published by Trans Tech Publications Ltd. This book was released on 2014-09-12 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collection of selected, peer reviewed papers from the 2014 International Conference on Advanced Materials, Structures and Mechanical Engineering (ICAMSME 2014), May 3-4, 2014, Incheon, South-Korea. The 213 papers are grouped as follows: Chapter 1: Applied Mechanics and Manufacturing Processes Engineering, Chapter 2: Material Science and Technology, Chapter 3: Civil and Structural Engineering, Chapter 4: Other Related Topics.
Book Synopsis The Mechanical Behavior of Materials X by : Soo Woo Nam
Download or read book The Mechanical Behavior of Materials X written by Soo Woo Nam and published by Trans Tech Publications Ltd. This book was released on 2007-08-15 with total page 1658 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). The objective of this collection was to gather together the latest information on the mechanical behavior of materials. The volumes cover the progress made in all aspects of the mechanical behavior of materials, seen from both the macroscopic and microscopic viewpoints.
Download or read book High Pressure Technology written by and published by . This book was released on 2004 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Advances in Solids and Structures by :
Download or read book Recent Advances in Solids and Structures written by and published by . This book was released on 2005 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
