Constant-Amplitude Fatigue Behavior of Five Carbon Or Low-Alloy Cast Steels at Room Temperature and -45°C 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 Constant-Amplitude Fatigue Behavior of Five Carbon Or Low-Alloy Cast Steels at Room Temperature and -45°C PDF full book. Access full book title Constant-Amplitude Fatigue Behavior of Five Carbon Or Low-Alloy Cast Steels at Room Temperature and -45°C by JH. Chung. Download full books in PDF and EPUB format.
Author: JH. Chung
Publisher:
ISBN:
Category : Crack growth
Languages : en
Pages : 21
Get Book Here
Book Description
Five common carbon or low-alloy cast steels--SAE 0030, SAE 0050A, C-Mn, Mn-Mo and AISI 8630--were subjected to constant-amplitude fatigue tests at room temperature and at the common low climatic temperature of -45°C (-50°F). Tests included smooth specimen axial low and high cycle fatigue and compact type (CT) specimen crack growth behavior from 10-5 n/cycle (4 x 10-4 in./cycle) to threshold values at 10-10 m/cycle (4 x 10-9 in./cycle). Three of the five steels had nil ductility transition temperatures above the low test temperature. Despite this, all five cast steels showed equivalent or better fatigue resistance at the low temperature, except for some very short life low-cycle fatigue tests and for some very high fatigue crack growth rates where fracture was imminent. Scanning electron fractographic analysis indicated that ductile type fatigue crack growth mechanisms with or without striations occurred for all steels at both test temperatures except for a few interdispersed cleavage facets in 0050A steel at very high crack growth rates. At the low temperature, monotonic and cyclic stress-strain properties Su, Sy, and Sy' increased by an average of about 10%, fatigue limits increased from 2 to 25%, and ?Kth increased from 0 to 90%. No consistent correlations existed between fatigue and monotonic properties at either temperature. Mean stress effects at near ?Kth levels appeared to be influenced by crack closure.
Author: JH. Chung
Publisher:
ISBN:
Category : Crack growth
Languages : en
Pages : 21
Get Book Here
Book Description
Five common carbon or low-alloy cast steels--SAE 0030, SAE 0050A, C-Mn, Mn-Mo and AISI 8630--were subjected to constant-amplitude fatigue tests at room temperature and at the common low climatic temperature of -45°C (-50°F). Tests included smooth specimen axial low and high cycle fatigue and compact type (CT) specimen crack growth behavior from 10-5 n/cycle (4 x 10-4 in./cycle) to threshold values at 10-10 m/cycle (4 x 10-9 in./cycle). Three of the five steels had nil ductility transition temperatures above the low test temperature. Despite this, all five cast steels showed equivalent or better fatigue resistance at the low temperature, except for some very short life low-cycle fatigue tests and for some very high fatigue crack growth rates where fracture was imminent. Scanning electron fractographic analysis indicated that ductile type fatigue crack growth mechanisms with or without striations occurred for all steels at both test temperatures except for a few interdispersed cleavage facets in 0050A steel at very high crack growth rates. At the low temperature, monotonic and cyclic stress-strain properties Su, Sy, and Sy' increased by an average of about 10%, fatigue limits increased from 2 to 25%, and ?Kth increased from 0 to 90%. No consistent correlations existed between fatigue and monotonic properties at either temperature. Mean stress effects at near ?Kth levels appeared to be influenced by crack closure.
Author: Ralph I. Stephens
Publisher: John Wiley & Sons
ISBN: 0471510599
Category : Technology & Engineering
Languages : en
Pages : 496
Get Book Here
Book Description
Classic, comprehensive, and up-to-date Metal Fatigue in Engineering Second Edition For twenty years, Metal Fatigue in Engineering has served as an important textbook and reference for students and practicing engineers concerned with the design, development, and failure analysis of components, structures, and vehicles subjected to repeated loading. Now this generously revised and expanded edition retains the best features of the original while bringing it up to date with the latest developments in the field. As with the First Edition, this book focuses on applied engineering design, with a view to producing products that are safe, reliable, and economical. It offers in-depth coverage of today's most common analytical methods of fatigue design and fatigue life predictions/estimations for metals. Contents are arranged logically, moving from simple to more complex fatigue loading and conditions. Throughout the book, there is a full range of helpful learning aids, including worked examples and hundreds of problems, references, and figures as well as chapter summaries and "design do's and don'ts" sections to help speed and reinforce understanding of the material. The Second Edition contains a vast amount of new information, including: * Enhanced coverage of micro/macro fatigue mechanisms, notch strain analysis, fatigue crack growth at notches, residual stresses, digital prototyping, and fatigue design of weldments * Nonproportional loading and critical plane approaches for multiaxial fatigue * A new chapter on statistical aspects of fatigue
Author: A. Fatemi
Publisher:
ISBN:
Category : Crack growth
Languages : en
Pages : 20
Get Book Here
Book Description
Five common cast steels were subjected to SAE transmission history at room temperature and three low climatic temperatures using an as-drilled keyhole notched compact specimen. The three low temperatures were -34, -45, and -60°C. These temperatures were both above and below nil ductility transition temperatures. Three fatigue criteria were specifically monitored: crack initiation defined by the first visible surface crack ?a equal to 0.25 mm, ?a equal to 2.5 mm, and final fracture. All low-temperature total fatigue lives were equal to or better than at room temperature for four of the five cast steels. All steels exhibited crack initiation lives at low temperatures equal to or better than at room temperature. Fatigue crack growth life tended to increase as the temperature was lowered, and then this trend reversed. Scanning electron fractographic analysis showed all ductile type fatigue crack growth mechanisms above or below the nil ductility transition temperature.
Author: Arctic Science and Technology Information System
Publisher:
ISBN:
Category : Arctic regions
Languages : en
Pages : 540
Get Book Here
Book Description
Author: M. H. Aliabadi
Publisher: Springer
ISBN: 9783540527176
Category : Mathematics
Languages : en
Pages : 440
Get Book Here
Book Description
Author: RI. Stephens
Publisher:
ISBN:
Category : Crack initiation
Languages : en
Pages : 14
Get Book Here
Book Description
Room temperature fatigue behavior was obtained for eight different steels, including cast, hot-rolled, quenched and tempered, and case-hardened steels, under both constant and variable amplitude load conditions. Constant amplitude fatigue crack growth behavior was obtained with compact-type specimens with load ratios R ? 0 and -1. Variable amplitude fatigue behavior was obtained from keyhole-notched compact-type specimens by using the Society of Automotive Engineers' transmission history and three modifications of this history including single tensile overloads. The keyhole specimen and the variable amplitude spectra were chosen to simulate room temperature real-life situations including both crack initiation and crack propagation. Fatigue behavior of the eight steels is compared.
Author: Ralph I. Stephens
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 484
Get Book Here
Book Description
Author: Jeffrey Perout (J.)
Publisher:
ISBN:
Category : Metals
Languages : en
Pages :
Get Book Here
Book Description
Author: B. Yang
Publisher:
ISBN:
Category : Backtracking method
Languages : en
Pages : 17
Get Book Here
Book Description
High-cycle and low-cycle fatigue tests were conducted on SA533-B1 steels with four levels of sulfur content at room temperature. For high-cycle fatigue (HCF) tests, the fatigue limit was observed around the yield stress (650 MPa) and showed little or no dependence on sulfur content. The lower the applied maximum stress (around the fatigue limit), the more scattered the fatigue life data. From the low-cycle fatigue (LCF) results, an excellent correlation between the SWT (Smith, Watson, and Topper) stress parameter versus reversals to failure was obtained. Fatigue life could be predicted from either the SWT parameter or Coffin-Manson equation for a specimen under constant strain amplitude loading conditions. A comparison of scanning-electron-microscopy (SEM) fractographic features of HCF- and LCF-tested specimens has been made. Obscured crack-initiation sites, wider striation spacing, and quasi-cleavage were observed to be characteristic of LCF, in contrast to the fractographic features of HCF-tested specimens.
