Experimental and numerical analyses of mean stress relaxation in cold expanded plate of Al-alloy 2024-T3 in double shear lap joints

2018 ◽  
Vol 42 (1) ◽  
pp. 209-222 ◽  
Author(s):  
Elyas Abdollahi ◽  
Tajbakhsh Navid Chakherlou
Keyword(s):  
Stress Relaxation ◽  
Lap Joints ◽  
Numerical Analyses ◽  
Al Alloy ◽  
Mean Stress ◽  
Double Shear ◽  
Mean Stress Relaxation

A Cyclic Plasticity Model for Advanced Light Metal Alloys

2013 ◽  
Vol 391 ◽  
pp. 3-8 ◽  
Author(s):  
Kyriakos I. Kourousis
Keyword(s):  
Stress Relaxation ◽  
Automotive Industry ◽  
Preliminary Analysis ◽  
Light Metal ◽  
Metal Alloys ◽  
Cyclic Plasticity ◽  
Isotropic Hardening ◽  
Mean Stress ◽  
Mean Stress Relaxation ◽  
Cyclic Plasticity Model

Advanced light metals have recently attracted the interest of the aerospace and automotive industry. The need for accurate description of their cyclic inelastic response under various loading histories becomes increasingly important. Cyclic mean stress relaxation and ratcheting are two of the phenomena under investigation. A combined kinematic isotropic hardening model is implemented for the simulation of the behavior of Aluminum and Titanium alloys in uniaxial mean stress relaxation and ratcheting. The obtained results indicate that the model can perform well in these cases. This preliminary analysis provides useful insight for the evaluation of the models capabilities.

Prediction of fatigue life in cold expanded Al-alloy 2024-T3 plates used in double shear lap joints

2013 ◽  
Vol 27 (5) ◽  
pp. 1415-1425 ◽  
Author(s):  
Hadi Taghizadeh ◽  
Tajbakhsh Navid Chakherlou ◽  
Afshin Babaei Aghdam
Keyword(s):  
Fatigue Life ◽  
Lap Joints ◽  
Al Alloy ◽  
Double Shear

Fatigue Behavior of Stainless Steel 304L Including Strain Hardening, Prestraining, and Mean Stress Effects

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Julie Colin ◽  
Ali Fatemi ◽  
Said Taheri
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Stress Relaxation ◽  
Fatigue Behavior ◽  
Control Mode ◽  
Mean Stress ◽  
Continuous Increase ◽  
Stainless Steel 304L ◽  
Mean Stress Relaxation ◽  
Mean Strain

This paper discusses cyclic deformation and fatigue behaviors of stainless steel 304L and aluminum 7075-T6. Effects of loading sequence, mean strain or stress, and prestraining were investigated. The behavior of aluminum is shown not to be affected by preloading, whereas the behavior of stainless steel is greatly influenced by prior loading. Mean stress relaxation in strain control and ratcheting in load control and their influence on fatigue life are discussed. Some unusual mean strain test results are presented for SS304L, where in spite of mean stress relaxation fatigue lives were significantly longer than fully-reversed tests. Prestraining indicated no effect on either deformation or fatigue behavior of aluminum, while it induced considerable hardening in SS304L and led to different results on fatigue life, depending on the test control mode. Possible mechanisms for secondary hardening observed in some tests, characterized by a continuous increase in the stress response and leading to runout fatigue life, are also discussed. The Smith–Watson–Topper parameter was shown to correlate most of the experimental data for both materials under different loading conditions.

Experimental and Theoretical Study of the Cyclic Relaxation of Die Cast Magnesium Alloy

2009 ◽  
Vol 610-613 ◽  
pp. 991-998 ◽  
Author(s):  
Shu Sheng Xu ◽  
Xiang Guo Zeng ◽  
Zhan Hua Gao ◽  
Hua Yan Chen ◽  
Jing Hong Fan
Keyword(s):  
Magnesium Alloy ◽  
Stress Relaxation ◽  
Constitutive Model ◽  
Fatigue Testing ◽  
Weight Ratio ◽  
Mean Stress ◽  
R Ratio ◽  
The Mean ◽  
Mean Stress Relaxation ◽  
Magnesium Alloy Am60

Magnesium alloys are among the best light-weight structural material with a relatively high strength-to-weight ratio end excellent technological properties. Therefore, magnesium attracts special attention of researchers working in automotive and aircraft industry. This work paid the efforts to the structural components made out of magnesium alloy AM60 such as chassis, transmission case in automotive, where the components are subject to cyclic loading after being pre-loaded. In this study, the cyclic stress-strain behaviors were investigated by strain-controlled fatigue testing. In order to investigate the effects of R-ratio on mean stress relaxation, the R-ratio ranged from 0.1 to 0.7 at the strain amplitude of 0.3%. The experimental results indicate that the mean stress relaxation increases with the increasing R-ratio. A constitutive model was proposed to simulate the mean stress relaxation. The calculation results show that the constitutive model developed in this work is capable of reproducing the stress relaxation behaviors of magnesium alloy AM60 under strain control.

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