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 Biaxial Fatigue of Inconel 718

1984 ◽  
Vol 106 (3) ◽  
pp. 227-232 ◽  
Author(s):  
D. F. Socie ◽  
T. W. Shield
Keyword(s):  
Shear Strain ◽  
Strain Amplitude ◽  
Inconel 718 ◽  
Fatigue Tests ◽  
Mean Stress ◽  
Normal Strain ◽  
Maximum Shear Strain ◽  
Cracking Behavior ◽  
Biaxial Fatigue ◽  
Shear Strain Amplitude

Biaxial fatigue tests were conducted on Inconel 718 thin-walled tubular specimens to quantify the effect of mean stress. The specimens were loaded in combined tension and torsion in strain control at room temperature. Fatigue lives ranged from 3000 to 15,000 cycles depending on the mean stress. These data were correlated with a parameter based on the maximum plastic shear strain amplitude, normal strain amplitude and mean normal stress on the plane of maximum shear strain amplitude. This parameter was combined with the Coffin-Manson equation for estimating fatigue lives. Observations of the cracking behavior show that mean stress affects the rate of crack growth and distribution of cracks.

scholarly journals Mean stress effects on Low-Cycle Fatigue behaviour of Inconel 718 alloy

2019 ◽  
Vol 300 ◽  
pp. 15004
Author(s):  
Sabrina Vantadori ◽  
Andrea Carpinteri ◽  
Camilla Ronchei ◽  
Daniela Scorza ◽  
Andrea Zanichelli
Keyword(s):  
Inconel 718 ◽  
Low Cycle Fatigue ◽  
Strain Ratio ◽  
Fatigue Behaviour ◽  
Multiaxial Fatigue ◽  
Test Results ◽  
Proportional Loading ◽  
Inconel 718 Alloy ◽  
Stress Effects ◽  
Biaxial Fatigue

Uniaxial and biaxial fatigue test results related to Inconel 718 specimens are analysed by using the critical plane-based multiaxial fatigue criterion by Carpinteri et al., formulated in terms of strain, in conjunction with a model similar to that by Smith-Watson-Topper (SWT). More precisely, both smooth solid specimens and thin-walled tubular specimens subjected to proportional and non-proportional loading consisting of tension, torsion, and combined tension and torsion loading under strain control are examined, for strain ratio equal to 0 or -1. Fatigue life is then analytically computed through the above procedure and compared with the experimental one, in terms of number of loading cycles needed to form a surface crack whose length is equal to 1 mm.

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.

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

The Effect of Mean Stress Components in High-Cycle, Biaxial Fatigue

2003 ◽  
Vol 31 (2) ◽  
pp. 177-186 ◽  
Author(s):  
Edgar G. Munday
Keyword(s):  
Stress State ◽  
Principal Stress ◽  
Relative Orientation ◽  
New Method ◽  
Mean Stress ◽  
Time Varying ◽  
Biaxial Fatigue ◽  
Stress Components ◽  
The Mean

A new method is presented to obtain the effect of mean stress components in high-cycle, biaxial fatigue. It is assumed that the time-varying stress state can be represented as a superposition of mean components, and proportionally applied alternating components. The method takes into account the relative orientation of the mean and alternating principal stress axes by making the ‘equivalent mean stress’ depend on the alternating components as well as the mean stress components. The method correlates well with the available data. The new method is compared with three popular methods.

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.

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