Assessment of some factors influencing the fatigue life of strength mis-matched HSLA steel weldments

2004 ◽  
Vol 25 (2) ◽  
pp. 125-135 ◽  
Author(s):  
S. Ravi ◽  
V. Balasubramanian ◽  
S. Babu ◽  
S.Nemat Nasser
Keyword(s):  
Fatigue Life ◽  
Hsla Steel ◽  
Factors Influencing

Factors influencing the extent of hydrogen-enhanced brittle cracking in a Cu-strengthened HSLA steel during monotonic loading

2003 ◽  
Vol 94 (11) ◽  
pp. 1228-1233 ◽  
Author(s):  
Indranil Chattoraj ◽  
Anil Kumar ◽  
Swapan K. Das ◽  
Mita Tarafder ◽  
Soumitra Tarafder
Keyword(s):  
Hsla Steel ◽  
Monotonic Loading ◽  
Factors Influencing

Factors Influencing the Fatigue Behavior of Ferrous Laminates

1987 ◽  
Vol 109 (3) ◽  
pp. 244-251 ◽  
Author(s):  
J. Wittenauer ◽  
O. D. Sherby
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Carbon Steel ◽  
Fatigue Behavior ◽  
Layered Material ◽  
Factors Influencing ◽  
Ultrahigh Carbon Steel ◽  
Processing History ◽  
Crack Blunting ◽  
Similar Processing

Laminates based on ultrahigh carbon steel were prepared and found to exhibit enhanced fatigue life as compared to a monolithic reference material. This result was achieved through the insertion of weak interlaminar regions of copper into the layered material during preparation of the laminates. The presence of these regions allowed for the operation of a delamination mechanism in advance of the propagating fatigue crack. The result was interlaminar separation and associated crack blunting. Stress-life curves show that an increase in life by as much as a factor of four is achieved for these materials when compared to monolithic specimens of similar processing history.

Evaluation of the factors influencing the strength of HSLA steel weld joint with softened HAZ

2015 ◽  
Vol 59 (6) ◽  
pp. 809-822 ◽  
Author(s):  
W. Maurer ◽  
W. Ernst ◽  
R. Rauch ◽  
R. Vallant ◽  
N. Enzinger
Keyword(s):  
Weld Joint ◽  
Hsla Steel ◽  
Steel Weld ◽  
Factors Influencing ◽  
Steel Weld Joint

Investigations Into Fatigue Performance of Offshore Mooring Chains

2017 ◽  
Author(s):  
Gary H. Farrow ◽  
Andrew E. Potts ◽  
Daniel G. Washington
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Fatigue Test ◽  
Test Data ◽  
Assessment Method ◽  
Accurate Estimate ◽  
Element Analysis ◽  
Factors Influencing ◽  
Non Linear

The Chain Finite Element Analysis of Residual Strength Joint Industry Project (Chain FEARS JIP) aimed to develop guidance for the determination of a rational discard criteria for mooring chains subject to severe pitting corrosion which would otherwise require immediate removal and replacement. Critical to the ability to evaluate the residual fatigue life of a degraded chain, is to have an accurate estimate of the chain in its as-new condition, thereby providing a benchmark for any loss in fatigue life associated with severe corrosion or wear. A non-linear multi-axial Finite Element Analysis (FEA) fatigue assessment method was developed and correlated against available fatigue test data as part of the JIP achieving this critical requirement. The development of this correlated methodology necessitated a review of: • The available mooring chain fatigue test data, to identify the factors influencing chain fatigue life and failure location. • FEA fatigue methodologies currently employed in the industry. • Current Class Rules relating to fatigue estimation. • The influence of material, manufacturing and operational factors on chain fatigue life. It was established that while the linear FEA fatigue method currently employed in the industry does not correlate with the fatigue test data, the non-linear multi-axial FEA fatigue method developed in the JIP afforded good correlation with test data. It was also demonstrated that the magnitude of mean chain tension and inconsistency in proof loading, as a consequence of the inconsistency in Class Minimum Break Load (MBL) specification, and with respect to chain size and the varying material ductility of steel grades, effects fatigue life. The identified inconsistency in the proofing indicates a likely inconsistency in conservatism embodied in the Class Rules fatigue formulation. Consequently it is possible that chains of certain size and grade may have significantly less fatigue life than anticipated by Class. Further work is recommended to establish a more rational proof load specification and to develop an alternative Class Rules fatigue formulation accounting for the identified factors influencing fatigue.

Factors influencing dwell fatigue life in notches of a powder metallurgy superalloy

2013 ◽  
Vol 48 ◽  
pp. 55-67 ◽  
Author(s):  
T.P. Gabb ◽  
J. Gayda ◽  
J. Telesman ◽  
L.J. Ghosn ◽  
A. Garg
Keyword(s):  
Fatigue Life ◽  
Powder Metallurgy ◽  
Factors Influencing ◽  
Dwell Fatigue

scholarly journals Fatigue life analysis of bolt joints with use of ANSYS software

Mechanik ◽  
2018 ◽  
Vol 91 (7) ◽  
pp. 600-602
Author(s):  
Michał Jasztal ◽  
Mariusz Ręgowski
Keyword(s):  
Fatigue Life ◽  
Numerical Calculations ◽  
Lap Joint ◽  
Ansys Software ◽  
Factors Influencing ◽  
Life Analysis ◽  
Fatigue Life Analysis

The paper presents selected problems of fatigue life of bolt joints. An analysis of factors influencing fatigue life of bolt joints was performed and selected methods of improving life were described. Authors presents examples of numerical calculations with use of ANSYS software which depict influence of pre-tension in the bolt on fatigue life of the joint. Presented results of life calculation were carried out for bolt joint loaded along bolt axis and for bolt lap joint loaded perpendicular to bolt axis.

Influences of MMR, PWHT and notch location on fatigue life of HSLA steel welds

2004 ◽  
Vol 11 (4) ◽  
pp. 619-634 ◽  
Author(s):  
S. Ravi ◽  
V. Balasubramanian ◽  
S. Babu ◽  
S. Nemat Nasser
Keyword(s):  
Fatigue Life ◽  
Hsla Steel ◽  
Steel Welds

scholarly journals Fatigue Examination of HSLA Steel with Yield Strength of 960 MPa and Its Welded Joints under Strain Mode

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 228
Author(s):  
Tomasz Ślęzak
Keyword(s):  
Fatigue Life ◽  
Welded Joints ◽  
Low Cycle Fatigue ◽  
Fatigue Cracks ◽  
Hsla Steel ◽  
Fatigue Crack Initiation ◽  
High Strength ◽  
Fusion Line ◽  
Cycle Fatigue ◽  
Strain Mode

The full benefits of application the high strength low alloyed steels HSLA can be achieved if the structures will be able to carry the alternate loads and fatigue cracks will not be formed, even in the vicinity of welded joints. For this reason the purpose of this study is to find and to explain the influence of different factors on fatigue crack initiation and the nature of crack propagation in HSLA steel and its welded joints. The S960QL steel and two types of welded joints were subjected to low cycle fatigue (LCF) tests at a strain mode and the received surfaces of fractures were analyzed using SEM microscope. Additionally, the microhardness measurements and the residual stress analyze in a cross-section of the joint were conducted. The maximum hardness was determined on the fusion line and more favorable hardness distribution was in the square joints than in single-V. Compiled maps of residual stresses have shown that the local orientation and values of the principal stress vector near the fusion line can influence negative the fatigue life. Finally, the square joints tested in the low cycle fatigue regime have shown a slightly higher fatigue life in comparison with single-V.

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