Experiments and Analysis of Mean Stress Effects on Fatigue for SAE1045 Steels

2008 ◽  
pp. 493-493-17 ◽  
Author(s):  
CC Chu ◽  
RA Chernenkoff ◽  
JJF Bonnen
Keyword(s):  
Mean Stress ◽  
Stress Effects

Study on Mean Stress Effects for Design Fatigue Curves

2016 ◽  
Author(s):  
Seiji Asada ◽  
Takeshi Ogawa ◽  
Makoto Higuchi ◽  
Hiroshi Kanasaki ◽  
Yasukazu Takada
Keyword(s):  
Evaluation Method ◽  
Austenitic Stainless Steels ◽  
Fatigue Curve ◽  
Carbon Steels ◽  
Low Alloy Steels ◽  
Mean Stress ◽  
Research Committee ◽  
Stress Effects ◽  
Alloy Steels ◽  
Design Factors

In order to develop new design fatigue curves for austenitic stainless steels, carbon steels and low alloy steels and a new design fatigue evaluation method that are rational and have a clear design basis, the Design Fatigue Curve (DFC) subcommittee was established in the Atomic Energy Research Committee in the Japan Welding Engineering Society. Mean stress effects for design fatigue curves are to be considered in the development of design fatigue curves. The Modified Goodman approach for mean stress effects is used in the design fatigue curves of the ASME B&PV Code. Tentative design fatigue curves were developed and studies on the effect of mean stress and design factors are on-going. Development of design fatigue curves, effect of mean stress and design factors is needed to establish a new fatigue design evaluation method. The DFC subcommittee has studied correction approaches for mean stress effects and the approaches of modified Goodman, Gerber, Peterson and Smith-Watson-Topper were compared using test data in literature. An appropriate approach for mean stress effects are discussed in this paper.

Biaxial Fatigue of Inconel 718 Including Mean Stress Effects

2008 ◽  
pp. 463-463-19 ◽  
Author(s):  
DF Socie ◽  
LA Waill ◽  
DF Dittmer
Keyword(s):  
Inconel 718 ◽  
Mean Stress ◽  
Stress Effects ◽  
Biaxial Fatigue

Mean stress effects in stress-life fatigue and the Walker equation

2009 ◽  
Vol 32 (3) ◽  
pp. 163-179 ◽  
Author(s):  
N. E. DOWLING ◽  
C. A. CALHOUN ◽  
A. ARCARI
Keyword(s):  
Mean Stress ◽  
Stress Effects

Fatigue Master Curve Approach for Arc-Welded Aluminium Joints: Mean Stress Effects

2011 ◽  
Author(s):  
J. H. den Besten ◽  
R. H. M. Huijsmans
Keyword(s):  
Crack Propagation ◽  
Master Curve ◽  
Base Material ◽  
Welding Process ◽  
Propagation Model ◽  
Fatigue Performance ◽  
Rational Approach ◽  
Mean Stress ◽  
Stress Effects ◽  
Weld Toe

Mean stress affects the crack propagation and fatigue performance of arc-welded joints. However, it is a tough phenomenon because of a complex combination of properties in the alternating material zones: weld material, Heat Affected Zone (HAZ) material and base material. First, modeling steps from weld notch stress distributions to weld stress intensity factors, to a non-similitude two-stage crack propagation model, to a fatigue master curve formulation are summarized. Focusing on base and HAZ material, Walker’s mean stress model is adopted as a result of a concise review and superior results shown in literature. However, its model coefficient γ is determined using a rational approach rather than curve fitting and a micro- and macro-crack propagation effect is distinguished. Subsequently, for base material, the crack propagation model is modified to incorporate loading induced mean stress effects. Validation using experimental crack propagation data shows promising results. In the HAZ, except loading induced mean stress, the welding process induced residual stress acts as high-tensile mean stress as well. The latter dominates the former in the micro-crack propagation region. Fatigue performance improvement, e.g. a result of Ultrasonic Impact Treatment (UIT), that reduce the high-tensile mean stress is included correcting the loading induced macro-crack propagation mean stress parameter. Finally, the fatigue master curve formulation is modified accordingly and mean stress effects in the HAZ are satisfactorily validated using weld toe failure fatigue test data, including some UIT results.

Evaluation of Methods for the Treatment of Mean Stress Effects on Low-Cycle Fatigue

1982 ◽  
Vol 104 (2) ◽  
pp. 403-411 ◽  
Author(s):  
M. Doner ◽  
K. R. Bain ◽  
J. H. Adams
Keyword(s):  
Crack Initiation ◽  
Low Cycle Fatigue ◽  
Correction Method ◽  
Equivalent Strain ◽  
Mean Stress ◽  
Cycle Fatigue ◽  
Stress Effects ◽  
Goodman Diagram ◽  
Materials Used ◽  
Turbine Design

Several methods proposed for the treatment of mean stress effects on time-independent low cycle fatigue (LCF) lifetime were critically evaluated using LCF crack initiation data on a number of materials used in gas turbine design. The methods evaluated included Jaske’s equivalent strain (εeq) formulation, Manson ’s mean stress correction method and nonlinear Goodman diagram representation of the strain-controlled LCF data. LCF crack initiation data on STA Ti-6-4 (533K), Ti-5522S (783K), IN-706 (866K) and MAR-M246 (1033K) were utilized in the evaluations. The evaluations were carried out in terms of each method’s capability to back-predict the experimetnal data used in its construction. Also considered were the implications associated with the type and the extent of data required for each method.

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