scholarly journals On single-edge-crack tension specimens for tension-compression fatigue crack growth testing

2017 ◽  
Vol 176 ◽  
pp. 343-350 ◽  
Author(s):  
Ashok Saxena ◽  
Federico Bassi ◽  
Kevin Nibur ◽  
James C. Newman
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Edge Crack ◽  
Single Edge ◽  
Fatigue Crack Growth Testing

A Study on the Effect of Overload Ratio on Fatigue Crack Growth

2004 ◽  
Vol 261-263 ◽  
pp. 1159-1168 ◽  
Author(s):  
Kyung Su Kim ◽  
Seok Cheol Kim ◽  
Chun S. Shim ◽  
J.Y. Park
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Retardation ◽  
Edge Crack ◽  
Constant Amplitude ◽  
Single Edge ◽  
Number Of Cycles ◽  
Crack Retardation ◽  
Crack Growth Retardation

A growing fatigue crack is known to be retarded on application of an overload cycle. The retardation may be characterized by the total number of cycles involved during retardation and the retarded crack length. The overload ratio plays an important role to influence the retardation behavior. The objective of the present investigation is to study the effect of different overload ratio on the retardation behavior. For ESET (eccentrically-loaded single edge crack tension) specimens, fatigue crack growth tests were conducted under cyclic constant-amplitude loading including a single tensile overloading with different overload ratios. The proposed crack retardation model predicted crack growth retardation due to a single tensile overloading. The predicted results were compared with the experimental ones to confirm the reliability of this model.

A single edge notch specimen for fatigue, creep-fatigue and thermo-mechanical fatigue crack growth testing

2018 ◽  
Vol 199 ◽  
pp. 760-772 ◽  
Author(s):  
Santosh B. Narasimhachary ◽  
Kanwardeep S. Bhachu ◽  
Sachin R. Shinde ◽  
Phillip W. Gravett ◽  
James C. Newman
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Single Edge ◽  
Single Edge Notch ◽  
Mechanical Fatigue ◽  
Creep Fatigue ◽  
Edge Notch ◽  
Fatigue Crack Growth Testing

scholarly journals Fatigue crack growth testing using varying R-ratios

2010 ◽  
Vol 2 (1) ◽  
pp. 155-161 ◽  
Author(s):  
Magnus Hörnqvist ◽  
Thomas Hansson ◽  
Olle Clevfors
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fatigue Crack Growth Testing

Comparison of Fatigue Crack Growth Rates Between Different Specimen Geometries

2021 ◽  
Author(s):  
Yan-Hui Zhang ◽  
Matthew Doré
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Literature Review ◽  
Crack Growth ◽  
Compact Tension ◽  
Specimen Geometry ◽  
Single Edge ◽  
Single Edge Notch ◽  
Advantages And Disadvantages ◽  
Edge Notch

Abstract Most engineering components are subjected to cyclic loading in service and design against fatigue failure is often a key consideration in design. For fracture mechanics fatigue analysis, fatigue crack growth (FCG) tests are often required to determine the relevant Paris power law parameters for the material under the environment concerned. Standards allow use of different specimen geometries for FCG tests such as compact tension (CT), centre crack tension (CCT), single edge notch bend (SENB) and single edge notch tension (SENT). However, when selecting specimen geometry for fatigue crack growth rate (FCGR) testing, there is often doubt about which specimen geometry is more appropriate and whether they give similar FCGR. There is limited work to compare the FCGR between different specimen geometries. This paper first briefly introduces the guidance on FCG test specimen geometries in standards and compares the advantages and disadvantages of these specimen geometries. A comprehensive literature review is carried out to compare the FCGR data between different specimen geometries. FCGR tests are conducted on SENB, SENT and CCT specimens of C-Mn steel to investigate any effects of specimen symmetry/asymmetry and crack constraint on FCGR. Based on the literature review and test data, it is concluded that FCGR is independent of the specimen geometries examined.

Effects of Hydrogen on Fatigue Crack Growth of Iron Aluminides

1994 ◽  
Vol 364 ◽  
Author(s):  
A. Castagna ◽  
N.S Stoloff
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Al Alloys ◽  
Moist Air ◽  
Stress Intensity Range ◽  
Low Levels ◽  
Structural Iron ◽  
Fatigue Crack Growth Testing ◽  
Crack Growth Rates

AbstractThree Fe-Al alloys, FAP-Y, FA-129, and Fe-35a%Al, containing 16, 28, and 35a%Al, respectively, have been subjected to fatigue crack growth testing in moist air, in oxygen, and in gaseous hydrogen. In each case hydrogen and air were embrittling. Crack growth rates increased significantly as frequency decreased. Fatigue crack growth results have been compared with those for other structural iron-base alloys. Surprisingly, FAP-Y displays the highest crack growth rate of any alloy examined, except at very low levels of stress intensity range. The mechanisms for embrittlement by hydrogen and by moisture in air are discussed.

Full Size Fatigue Crack-Growth Testing for Girth Welds

2004 ◽  
Author(s):  
Paulo Gioielli ◽  
Jaime Buitrago
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Production Quality ◽  
Small Scale ◽  
Loading Frequency ◽  
Growth Data ◽  
Girth Welds ◽  
Crack Growth Modeling ◽  
Fatigue Crack Growth Testing

Fatigue crack-growth modeling has a significant impact in establishing defect acceptance criteria for the inspection of fracture-critical, girth-welded components, such as risers and tendons. ExxonMobil has developed an experimental technique to generate crack-growth data, in actual welded tubulars, that account for the particular material properties, geometry, and residual stresses. The technique is fully compatible with conventional fracture mechanics models. It uses a series of pre-designed notches made around the welds on a production quality, full-scale specimen that is tested efficiently in a resonant fatigue setup. The crack development from notches is monitored during testing and evaluated post-mortem. Given its simplicity and high loading frequency, the technique provides growth data germane to the component at hand at a lower cost and faster than standard, small-scale tests.

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