Effects of Block Size, Stress Level, and Loading Sequence on Fatigue Characteristics of Aluminum-Alloy Box Beams

2009 ◽  
pp. 127-127-40 ◽  
Author(s):  
W Breyan
Keyword(s):  
Aluminum Alloy ◽  
Stress Level ◽  
Block Size ◽  
Box Beams ◽  
Fatigue Characteristics ◽  
Loading Sequence

Fatigue Characteristics of Open-End Thick-Walled Cylinders Under Cyclic Internal Pressure

1963 ◽  
Vol 85 (4) ◽  
pp. 555-565 ◽  
Author(s):  
T. E. Davidson ◽  
R. Eisenstadt ◽  
A. N. Reiner
Keyword(s):  
Fatigue Crack ◽  
Internal Pressure ◽  
Stress Level ◽  
Cyclic Stress ◽  
Diameter Ratio ◽  
Tensile Fatigue ◽  
Stress Levels ◽  
Fatigue Characteristics ◽  
Using Data ◽  
Rate Of Improvement

Thick-walled cylinder fatigue data due to cyclic internal pressure for open-end cylinders in the range of 103 to 105 cycles to failure and having a diameter ratio of 1.4 to 2.0 at a nominal yield strength of 160,000 pounds per square inch is presented. Discussed and also presented are the effects of autofrettage on the fatigue characteristics of thick-walled cylinders. Autofrettage substantially enhances fatigue characteristics at stress levels below the corresponding overstrain pressure, the degree of improvement increasing the decreasing stress levels. The rate of improvement in fatigue characteristics increases significantly with diameter ratio in autofrettaged cylinders up to a diameter ratio of 1.8–2.0 and to a much smaller degree in the nonautofrettaged condition. The rate of improvement of fatigue characteristics above 2.0 is the same for both the autofrettaged and nonautofrettaged cases. It is shown that thermal treatment of 675 F for 6 hours after autofrettage does not affect fatigue characteristics and that there is a correlation between the cyclic-stress level and the area and depth of the fatigue crack to the point of ductile rupture. The depth of the fatigue crack decreases with increasing cyclic-stress level. A means for using data from a unidirectional tensile fatigue test to predict the fatigue characteristics of thick-walled cylinders is discussed.

Residual Stress Distribution of Non-Uniform Quenching in Al-Zn-Mg-Cu Aluminum Alloy Thick Plate

2020 ◽  
Vol 1003 ◽  
pp. 11-19
Author(s):  
Ya Nan Li ◽  
Yong An Zhang ◽  
Hong Lei Liu ◽  
Xin Yu Lv ◽  
Xi Wu Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Residual Stress ◽  
Aluminum Alloy ◽  
Heat Transfer Coefficient ◽  
Stress Distribution ◽  
Transfer Coefficient ◽  
Stress Level ◽  
Transverse Direction ◽  
Residual Stress Distribution ◽  
Surface Quenching

Effect of multi-section linear non-uniform heat transfer coefficient on quenching residual stress distribution in 27mm-thick Al-Zn-Mg-Cu aluminum alloy plate was simulation studied by using the finite element method, and the surface quenching residual stress distribution was measured by the X-ray diffraction method and hole-drilling method. The results show that the surface quenching residual stress represents the same distribution with non-uniform heat transfer coefficient in the transverse direction and the stress level maintains initial stress level of the heat transfer coefficient at each location. The distribution of the quenching residual stress in the center of the plate is approximately uniform and the stress level is approximately equal to average of maximum and minimum initial stress level. The measured surface quenching residual stress shows a wavy distribution in the transverse direction, which is similar to the simulated surface stress distribution without considering the stress level. The measurement results can be explained by the multi-section linear non-uniform quenching model.

Fatigue characteristics of 6061 aluminum alloy subject to 3.5% NaCl environment

2020 ◽  
Vol 133 ◽  
pp. 105420 ◽  
Author(s):  
Kittisak Chanyathunyaroj ◽  
Sompob Phetchcrai ◽  
Ghit Laungsopapun ◽  
Amornsak Rengsomboon
Keyword(s):  
Aluminum Alloy ◽  
6061 Aluminum Alloy ◽  
Fatigue Characteristics

Fatigue Characteristics of Nonferrous Bolts

2013 ◽  
Vol 577-578 ◽  
pp. 417-420 ◽  
Author(s):  
Shinji Hashimura ◽  
Tetsuya Torii ◽  
Yukio Miyashita ◽  
Shigeru Yamanaka ◽  
Genki Hibi
Keyword(s):  
Aluminum Alloy ◽  
Magnesium Alloy ◽  
Fatigue Tests ◽  
Bolted Joint ◽  
Fatigue Characteristics ◽  
Axial Fatigue

Fatigue characteristics of bolted joint tightened with a steel bolt have been discussed extensively. However the fatigue characteristics of bolted joint tightened with a nonferrous bolt have not been sufficiently discussed. In this study, two types of fatigue tests, axial fatigue tests and transverse fatigue tests, for nonferrous bolts were conducted. The nonferrous bolts used in this study made of AZ31 and AZX912 magnesium alloy and A5056 aluminum alloy. The results of both fatigue tests showed that the fatigue limits of the A5056 bolt were the highest of all. The fatigue limits of two kinds of the magnesium alloy bolts were almost the same in both fatigue tests. However the ration of the axial fatigue limits to the transverse fatigue limits were different according to the bolt materials.

High cycle fatigue characteristics of 2124-T851 aluminum alloy

2007 ◽  
Vol 1 (2) ◽  
pp. 168-172 ◽  
Author(s):  
Xue Li ◽  
Zhimin Yin ◽  
Bo Nie ◽  
Li Zhong ◽  
Qinglin Pan ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Fatigue Characteristics

Experimental Study on Fatigue Crack Propagation of Glare3-3/2 with Mechanics Properties

2012 ◽  
Vol 600 ◽  
pp. 273-278
Author(s):  
Zong Hong Xie ◽  
Tian Jiao Zhao ◽  
Rui Wu
Keyword(s):  
Growth Rate ◽  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Crack Propagation ◽  
Crack Growth ◽  
Fatigue Crack Propagation ◽  
Stress Level ◽  
Maximum Stress ◽  
Fatigue Tests

This study is to investigate the fatigue crack growth behavior of Glare3-3/2 under various stress levels. The Glare3-3/2 specimen consists of three 2024-T3 aluminum alloy sheets and two layers of glass/epoxy composite lamina. Tensile-tensile cyclic fatigue tests were conducted on centrally notched specimen at four stress levels with various maximum values. A digital camera system was used to take photos of the propagating cracks on both sides of the specimen. Image processing software was adopted to accurately measure the length of the cracks on each photo. The test results show that 1) Compared to 2024-T3 aluminum alloy, the fatigue properties of Glare3-3/2 are much better: under the same loading condition with maximum stress level of 120MPa, the crack growth rate of Glare3-3/2 is roughly 5% of the corresponding value of 2024-T3 aluminum alloy, while the fatigue life is 4 times higher than that of 2024-T3 aluminum alloy. 2) The maximum stress level shows strong influence on fatigue crack propagation behavior of Glare3-3/2. The value of steady state crack growth rate increases linearly, while the number of load cycles decreases exponentially, with respect to the maximum stress values used in the fatigue tests.

The Influence of Water in Fuel Tank Environment on Fatigue Property of Pre-Corroded 7XXX Aluminum Alloy

2011 ◽  
Vol 337 ◽  
pp. 756-760
Author(s):  
Li Hui ◽  
Song Zhou ◽  
Liang Xu ◽  
Shao Hua Ma ◽  
Yan Wang ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Stress Level ◽  
High Stress ◽  
Fatigue Property ◽  
Fuel Tank ◽  
Influence Of Water ◽  
High Stress Level

The fatigue life experiments of the pre-corroded 7XXX aluminum alloy(Kt=1 and Kt=3)were tested in environment of laboratory air and water in fuel tank, the median fatigue life and the safe fatigue life of the reliability of 99.9% and confidence of 95% can be obtained. The fatigue life of the pre-corroded 7XXX aluminum alloy reduced significantly because of the water in fuel tank environment, the fatigue life in the environment with water in fuel tank was 6.253% (Kt=1) of the fatigue life in laboratory air environment under the high stress level, the fatigue life with water in fuel tank environment significantly reduced under the low stress level, it was 1.658%(Kt=1) of the fatigue life in laboratory air environment. The fatigue life in the environment with water in fuel tank in different stress level was reduced almost fairly (Kt=3), it was 20.63% (Kt=3) of the fatigue life in laboratory air environment.

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