scholarly journals Multiaxial fatigue of cast aluminium EN AC-42000 T6 (G-AlSi7Mg0.3 T6) for automotive safety components under constant and variable amplitude loading

2016 ◽  
Vol 10 (37) ◽  
pp. 200-206 ◽  
Author(s):  
C.M. Sonsino ◽  
R. Franz
Keyword(s):  
Multiaxial Fatigue ◽  
Variable Amplitude Loading ◽  
Automotive Safety ◽  
Variable Amplitude ◽  
Cast Aluminium

Comparison of multiaxial fatigue damage models under variable amplitude loading

2012 ◽  
Vol 26 (11) ◽  
pp. 3439-3446 ◽  
Author(s):  
Hong Chen ◽  
De-Guang Shang ◽  
Yu-Jie Tian ◽  
Jian-Zhong Liu
Keyword(s):  
Fatigue Damage ◽  
Multiaxial Fatigue ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Damage Models

A New Multiaxial Fatigue Testing Method for Variable-Amplitude Loading and Stress Ratio

2003 ◽  
Author(s):  
Tommy J. George ◽  
M.-H. Herman Shen ◽  
Theodore Nicholas ◽  
Charles J. Cross
Keyword(s):  
Fatigue Test ◽  
Fatigue Testing ◽  
Low Cost ◽  
Design Procedure ◽  
Element Model ◽  
Multiaxial Fatigue ◽  
Biaxial Stress ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Stress Ratios

A new vibration-based multiaxial fatigue testing methodology for assessing high cycle turbine engine material fatigue strength at various stress ratios is presented. The idea is to accumulate fatigue energy on a base-excited plate specimen at high frequency resonant modes and to complete a fatigue test in a much more efficient way at very low cost. The methodology consists of: (1) a topological design procedure, incorporating a finite element model, to characterize the shape of the specimens for ensuring the required stress state/pattern, (2) a vibration feedback empirical procedure for achieving the high cycle fatigue experiments with variable-amplitude loading, and finally (3) a yielding procedure for achieving various uniaxial stress ratios. The performance of the methodology is demonstrated by the experimental results from mild steel, 6061-T6 aluminum, and Ti-6Al-4V plate specimens subjected to fully reversed bending for both uniaxial and biaxial stress states. Results are compared with those produced using traditional fatigue test machines.

Multiaxial Fatigue Under Variable Amplitude Loads

1999 ◽  
Vol 121 (3) ◽  
pp. 286-293 ◽  
Author(s):  
K. S. Kim ◽  
J. C. Park ◽  
J. W. Lee
Keyword(s):  
Shear Strain ◽  
Strain Range ◽  
Multiaxial Fatigue ◽  
Test Material ◽  
Computation Method ◽  
Strain History ◽  
Maximum Shear Strain ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Rainflow Cycle Counting

Multiaxial fatigue under variable amplitude loading is investigated using Kandil et al.’s parameter, rainflow cycle counting on the shear strain history, and the Miner-Palmgren damage rule. Fatigue data are obtained on tubular specimens of S45C steel under proportional and nonproportional tension-torsion loading. The approaches using the maximum shear strain range (Δγmax) plane and the maximum damage (Dmax) plane as the critical plane are investigated. The damage is computed for each reversal or for each cycle. The results show that both Δγmax and Dmax approaches yield acceptable fatigue lives irrespective of the damage computation method. Damage computation for each reversal tends to shift fatigue life toward the nonconservative side for some nonproportional loading. It is concluded that the overall procedure used in this study is viable for multiaxial life prediction under variable amplitude loading for the test material.

Multiaxial Fatigue Under Variable Amplitude Loading

Fatigue '96 ◽  
1996 ◽  
pp. 983-988
Author(s):  
E. Vidal-Sallé ◽  
B. Kenmeugne ◽  
J.L. Robert ◽  
J. Bahuaud
Keyword(s):  
Multiaxial Fatigue ◽  
Variable Amplitude Loading ◽  
Variable Amplitude

scholarly journals Prediction of fatigue damage accumulation of defective materials under variable amplitude loading

2019 ◽  
Vol 234 (1) ◽  
pp. 65-75
Author(s):  
Maroua Saggar ◽  
Anouar Nasr ◽  
Haifa Sallem ◽  
Chokri Bouraoui
Keyword(s):  
Damage Accumulation ◽  
Surface Defect ◽  
Multiaxial Fatigue ◽  
Cumulative Damage ◽  
Strong Nonlinearity ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Fatigue Damage Accumulation ◽  
Artificial Surface ◽  
Free Material

The main goal of this attempt is to explore and analyze the behavior of a material containing artificial surface defect and solicited under variable amplitude cyclic loading. The observation and the follow-up of the loading history and the characterization of the damage accumulation were evaluated in the presence of an artificial surface defect. The results made it possible to highlight a strong nonlinearity of the damage accumulation. However, the absence of sequence effects encountered in a defect-free material has been found. In the perspective of developing an approach to evaluate the influence of the defects on cumulative damage under variable amplitude loading, this work consists of coupling a multiaxial fatigue criterion adapted to defective materials with a law of uniaxial damage solicited under variable amplitudes loading. A cumulative damage law has been used to analyze the validity of the proposed method. Introducing the equivalent multiaxial fatigue stress due to the presence of the defect allowed us to predict the residual lifetime of a defective material, and to find the effects of sequences usually observed for variable amplitude loading for the defect-free material. A coherent agreement is observed between the results predicted by the improved model and those obtained from the experimental investigations on specimens containing artificial surface defect subjected to purely alternating tension and torsion under increasing and decreasing load levels.

Multiaxial fatigue assessment of welded connections in railway steel bridge under constant and variable amplitude loading

2018 ◽  
Vol 14 (1) ◽  
pp. 21-33 ◽  
Author(s):  
K.R. Praveen ◽  
S.S. Mishra ◽  
Prasad Babu ◽  
Andrea Spagnoli ◽  
Andrea Carpinteri
Keyword(s):  
Multiaxial Fatigue ◽  
Steel Bridge ◽  
Variable Amplitude Loading ◽  
Fatigue Assessment ◽  
Variable Amplitude
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