Fatigue Crack Growth Behavior in Mild Steel Weldments at Low Temperatures PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Fatigue Crack Growth Behavior in Mild Steel Weldments at Low Temperatures PDF full book. Access full book title Fatigue Crack Growth Behavior in Mild Steel Weldments at Low Temperatures by Y. Kitsunai. Download full books in PDF and EPUB format.
Author: Y. Kitsunai Publisher: ISBN: Category : Cleavage Languages : en Pages : 19
Book Description
Fatigue crack growth rates for the base metal and welds of SM50A steel weldments were determined at temperatures ranging from room temperature down to 123 K. For the base metal, crack growth rates between room temperature and 188 K decreased slightly with decreasing temperature. At 123 K, the growth rate of the base metal increased markedly because of cyclic cleavage during striation growth. For the welds, no systematic correlation can be made between temperature and growth rate. The growth rates of the welds were lower than those of the base metal regardless of temperature because the crack tips in the weld specimens always existed in the field of compressive residual stresses. Therefore the growth rates of the welds were dominated by residual welding stress rather than temperature. The crack growth rates of the base metal and the welds with residual stresses under low temperatures were closely correlated with the effective stress intensity factor range (?Keff), estimated based on crack closure measurements, when the crack growth mechanism was dominated by striation formation.
Author: Y. Kitsunai Publisher: ISBN: Category : Cleavage Languages : en Pages : 19
Book Description
Fatigue crack growth rates for the base metal and welds of SM50A steel weldments were determined at temperatures ranging from room temperature down to 123 K. For the base metal, crack growth rates between room temperature and 188 K decreased slightly with decreasing temperature. At 123 K, the growth rate of the base metal increased markedly because of cyclic cleavage during striation growth. For the welds, no systematic correlation can be made between temperature and growth rate. The growth rates of the welds were lower than those of the base metal regardless of temperature because the crack tips in the weld specimens always existed in the field of compressive residual stresses. Therefore the growth rates of the welds were dominated by residual welding stress rather than temperature. The crack growth rates of the base metal and the welds with residual stresses under low temperatures were closely correlated with the effective stress intensity factor range (?Keff), estimated based on crack closure measurements, when the crack growth mechanism was dominated by striation formation.
Author: L. Katz Publisher: ISBN: Category : Boiler codes Languages : en Pages : 24
Book Description
Fatigue crack growth experiments were conducted on low alloy steel submerged arc weld metals representative of those used in the fabrication of pressure vessels. Variations of wire composition, flux type, and postweld heat treatments were used to produce weld deposits of different microstructures and tensile and toughness properties. Fatigue crack growth experiments were conducted on 25.4-mm (1-in.) thick modified wedge opening loaded (WOL) specimens at room temperature and 288 °C (550°F). A compliance calibration curve was developed at room temperature and adjusted for use with elevated temperature compliance measurements. Results of these experiments indicate: (a) a slight effect of flux type on crack growth rates, (b) incomplete tempering or relief of residual welding stress, or both, has an appreciable effect on crack growth behavior, (c) comparable or lower crack growth rates at 288°C (550°F) compared to room temperature, (d) comparable or lower crack growth rates than those predicted in Section XI of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, and (e) variations in crack growth rates due to wire, flux, and postweld heat treatment were less pronounced than the variations in toughness and tensile properties.
Author: LA. James Publisher: ISBN: Category : Automotive medicine Languages : en Pages : 6
Book Description
The propagation of fatigue cracks in gas-tungsten-arc weldments of Type 304 stainless steel was studied at 75 (24) and 1000 F (538 C). It was found that the crack growth rate for cracks propagating normal to the direction of welding decreased as the crack approached the weld, and then increased as the crack grew through the weld and out the other side. It is postulated that this is due to the residual stresses produced during the welding process, and that metallurgical variations in the weldment play a minor role.
Author: A. Niku-Lari Publisher: Elsevier ISBN: 1483191001 Category : Science Languages : en Pages : 587
Book Description
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.
Author: AF. Greenan Publisher: ISBN: Category : Combined loading Languages : en Pages : 13
Book Description
Conventional specimens used to determine fatigue crack growth behavior have the initial crack oriented in such a way that only Mode I displacements are present. The fatigue-crack growth threshold behavior of mild steel in the presence of Mode II displacements was investigated by considering the fatigue behavior of spot-welded joints, where both Modes I and II are present at the point of failure, and by some experiments using specimens designed to give pure Mode II displacements.
Author: Y. Kitsunai
Author: Y. Kitsunai
Author: Ralph Ivan Stephens
Author: L. Katz
Author: LA. James
Author: 
Author: Lee A. James
Author: A. Niku-Lari
Author: C. C. Monahan
Author: J. L. Yuen
Author: AF. Greenan