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Influence Of Residual Stress On Fatigue Crack Growth In Thick Walled Cylinders
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Book Synopsis Influence of Residual Stress on Fatigue Crack Growth in Thick-Walled Cylinders by : A. Stacey
Download or read book Influence of Residual Stress on Fatigue Crack Growth in Thick-Walled Cylinders written by A. Stacey and published by . This book was released on 1988 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was conducted into fatigue crack growth in samples of as-received and autofrettaged, high-strength, low-alloy steel tubing containing residual stresses. Compact tension and C-shaped and ring specimens were used to measure properties in the axial and radial directions. Internally and externally flawed ring specimens were employed to propagate cracks through the original residual stress field. Experiments were performed for load ratios ranging between -0.5 and 0.8. Fatigue crack growth rates were substantially reduced by compressive residual stresses. The data were corrected for residual stress effects using the superposition principle. An effective stress intensity factor range, ?Keff, was defined that incorporates the residual stress intensity factor, Kres, and the applied ?K range. Using this approach, the correlation with the characteristics for no residual stress was very good. In addition, it was shown that fatigue crack growth rate characteristics measured with C-specimens can significantly misrepresent the actual behavior of the material and tubing under investigation if the remaining residual stress field is not taken into consideration.
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 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 Crack Growth in Externally Flawed, Autofrettaged Thick-Walled Cylinders and Rings by : JA. Kapp
Download or read book Crack Growth in Externally Flawed, Autofrettaged Thick-Walled Cylinders and Rings written by JA. Kapp and published by . This book was released on 1979 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study has been made to investigate the effect of autofrettage on crack growth in externally flawed, thick-walled cylinders and rings. With the use of singular finite elements, stress intensity factors were determined for cylinders containing a single, external crack oriented in the radial direction, subjected to either internal pressure or to a diametrical compression load normal to the crack plane. Fatigue crack growth rate experiments were conducted using several rings cut from cylinders which had been autofrettaged different amounts. The rings were fatigue cycled using the aforementioned compressive loading, which produced a properly oriented external crack. The results of these experiments show that fatigue crack growth rates can be increased by as much as an order of magnitude in cylinders which have been fully autofrettaged over those which contain no residual stresses. There is not sufficient data to model this increase in crack growth rate empirically; however, some comments are given on the effect of autofrettage residual stress on fatigue crack growth rate.
Book Synopsis A Simple Fracture Mechanics Based Method for Fatigue Life Prediction in Thick-Walled Cylinders by : D. P. Kendall
Download or read book A Simple Fracture Mechanics Based Method for Fatigue Life Prediction in Thick-Walled Cylinders written by D. P. Kendall and published by . This book was released on 1984 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method is proposed for predicting the fatigue life of thick-walled cylinders based on numerical integration of the fatigue crack growth curve as determined from a fracture mechanics analysis. The effects of autofrettage residual stresses, crack shape, and of the compressive portion of the stress intensity factor are accounted for. A method for correcting the autofrettage residual stresses for the Bauschinger Effect, based on recent analytical results by Peter Chen, is also included. A simple computer program for performing the calculation of fatigue life is presented along with a comparison of the calculated results with the experimental results of Davidson, and of Throop and Fujczak.
Book Synopsis The Effect of Autofrettage on Fatigue Crack Propagation in Externally Flawed Thick-walled Disks by : J. A. Kapp
Download or read book The Effect of Autofrettage on Fatigue Crack Propagation in Externally Flawed Thick-walled Disks written by J. A. Kapp and published by . This book was released on 1977 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of the autofrettage residual stress distribution on the crack growth rate in externally flawed thick-walled disks has been investigated. The crack growth rate was modeled by using the Paris power law relation. Stress intensity factors were calculated for internally pressurized, externally flawed, non-autofrettaged cylinders, by an approximate technique and with the use of the NASTRAN finite element computer program. A simple experiment was devised to determine the effect of autofrettage on crack growth rate. The test involved diametrically loading thin disks, cut from autofrettaged cylinders, NASTRAN was used to determine the stress intensity factors for this loading geometry. The experimentally observed results show that autofrettage increases the crack growth rate in externally flawed cylinders, but the test did not supply sufficient data to mathematically model the increase. The faster crack growth rate is believed to be caused by the local relaxation of the tensile autofrettage residual stresses due to large plastic zones accompanying crack growth. (Author).
Book Synopsis Influence of Residual Stresses on Fatigue Crack Growth at Stress-coined Holes by : Lennart Josefson
Download or read book Influence of Residual Stresses on Fatigue Crack Growth at Stress-coined Holes written by Lennart Josefson and published by . This book was released on 1993 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Influence of Surface Residual Stress on Fatigue Crack Growth by :
Download or read book The Influence of Surface Residual Stress on Fatigue Crack Growth written by and published by . This book was released on 2007 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Residual Stress on Fatigue Crack Growth by : Kee Siong Lian
Download or read book Effects of Residual Stress on Fatigue Crack Growth written by Kee Siong Lian and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Residual Stresses written by A. Niku-Lari and published by Elsevier. This book was released on 2014-05-17 with total page 587 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residual Stresses presents a collection of articles that provides information regarding the use of surface treatment systems. It discusses the developments in the technology and application of surface treatment. It addresses the influence of minor stresses on the performance of materials. Some of the topics covered in the book are the introduction to self-equilibrating stresses existing in materials, the stresses that form as a consequence of welding, the stresses made by machining, and the mechanical generation of self-stresses. The analysis of the stresses caused by thermal and thermochemical surface treatments is covered. The minor stresses in composite materials are discussed. The text describes the stresses in uranium and uranium alloys. The Trepan or ring core method, centre-hole method, and Sach's method are presented. A chapter of the volume is devoted to the measurement of residual stresses. Another section of the book focuses on the application of shot peened plates to residual stress distribution. The book will provide useful information to mechanics, engineers, students, and researchers.
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 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 Effects of Surface and Through Cracks on Failure of Pressurized Thin-walled Cylinders of 2014-T6 Aluminum by : William S. Pierce
Download or read book Effects of Surface and Through Cracks on Failure of Pressurized Thin-walled Cylinders of 2014-T6 Aluminum written by William S. Pierce and published by . This book was released on 1970 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Processing Residual Stresses on the Fatigue Crack Growth Behavior of Structural Materials by : Christopher James Lammi
Download or read book The Effects of Processing Residual Stresses on the Fatigue Crack Growth Behavior of Structural Materials written by Christopher James Lammi and published by . This book was released on 2009 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Residual stresses are a common and often undesired result of material processing, introduced through non-linear deformation and/or phase transformation of material under mechanical or thermo-mechanical loading. These macro stresses alter mechanical properties and the intrinsic fatigue crack growth characteristics of the material. Residual stress artifacts can introduce inconsistencies and significant errors when the true material behavior is needed for material development and optimization and for structural component design. The effects of quenching residual stresses on fatigue crack propagation behavior of various materials were investigated. In parallel, residual stresses similar in magnitude and distribution with the quenching residual stresses were generated using mechanical processes to decouple the effects of residual stresses from microstructural effects. Mechanical residual stress distributions predicted by 3D elastic-plastic finite element analysis showed good agreement with the stresses measured on fatigue crack growth testing specimens using fracture mechanics approaches. Crack propagation characteristics in fields with low and high residual stresses were studied using optical and scanning electron microscopy, and the effects of residual stress on crack path behavior were assessed. An original residual stress analytical correction to fatigue crack growth data was developed, compared to existing corrective methodologies, and validated using residual stress free data. Overall, the work provides tools to understand, control, and correct the effects of processing residual stresses on fatigue crack growth for accurate fatigue critical design and life predictions.
Book Synopsis Influence of Different Residual Stress Distributions on Fatigue Crack Growth by : Marco Beghini
Download or read book Influence of Different Residual Stress Distributions on Fatigue Crack Growth written by Marco Beghini and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of the Failure Criteria on the Residual Stress Distribution of Thick-walled Cylinders by : Harry Eugene Good
Download or read book The Effect of the Failure Criteria on the Residual Stress Distribution of Thick-walled Cylinders written by Harry Eugene Good and published by . This book was released on 1971 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture Analysis of Thick-Wall Cylinder Pressure Vessels by :
Download or read book Fracture Analysis of Thick-Wall Cylinder Pressure Vessels written by and published by . This book was released on 1982 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture mechanics analysis of cylindrical pressure vessels is described in a brief fracture case study. Also included in this report are additional examples of crack growth in pressure vessels and cannons. The case study is of an early brittle failure and subsequent redesign of a cannon tube. Fracture mechanics test methods are described which were developed specifically for testing of cylindrical geometries. Three examples of current fracture analysis of cylindrical pressure vessels are presented. Fast fracture of a vessel is described, including effects of tension residual stress and crack shape. Evidence of environmentally assisted fracture of a cannon tube is presented. Fatigue crack growth and life calculation methods for cylindrical pressure vessels are developed and checked with experimental results; effects of compressive residual stress due to overstrain are analyzed, including reductions from the expected theoretical residual stress due to reduced compressive strength of the alloy steel.
