Comparison of fatigue tests of two plastics, three composites and an aluminium alloy obtained on four different types of fatigue machines Findley, W.N. and Sutherland, R.L.J. Eng. Mater. Technol. (Trans. ASME) Jan. 1990 112, (1), 1–6

1991 ◽  
Vol 13 (2) ◽  
pp. 190-190
Keyword(s):  
Aluminium Alloy ◽  
Fatigue Tests ◽  
Different Types ◽  
Trans Asme

ASSESSMENT EXPERIMENTS ON FATIGUE RESISTANCE OF STRUCTURAL MATERIALS AND MACHINERY

2018 ◽  
Vol 2018 (8) ◽  
pp. 25-35
Author(s):  
Владимир Капралов ◽  
Vladimir Kapralov ◽  
Александр Осипов ◽  
Aleksandr Osipov ◽  
Нгок Нгуен ◽  
...  
Keyword(s):  
Testing Machine ◽  
Experimental Methods ◽  
Fatigue Tests ◽  
Operation Conditions ◽  
Test Conditions ◽  
First Approximation ◽  
Material Fatigue ◽  
Machine Reliability ◽  
Different Types ◽  
Asymmetric Cycle

A part of any complexity may be presented as a combination of smooth elements and those with design concentrators of mechanical stresses. As a consequence to a first approximation it is possible to investigate smooth samples for the assessment of material fatigue properties. An optimum formation of experiments on the assessment of fatigue strength, reliability and resource of the machine under design is a complex and significant problem. To carry out experiments for fatigue there are used testing machines of different kinds. A type of a testing machine is defined reasoning from the purpose of the work and possibilities of an experimentalist. Subject to the process of changes in time of stresses in a sample one differs fatigue tests at harmonic loading (symmetric, asymmetric cycle), biharmonic (application of two and more harmonics), program (change of stress amplitudes according to a certain program) and random at different types stochastic processes. The problem of machine reliability increase at the expense of destruction elimination in consequence of structural material fatigue is urgent in most of branches mechanical engineering. A topicality is particularly urgent in branches where accidents and breakdowns owing to the destruction of significant parts result in disastrous effects (power engineering, cosmonautics, aircraft, transport of all kinds and so on). For correct assessment of reliability and resource of significant parts subjected to time loads the test conditions approach to operation conditions. The purpose of this work is improvement of design- experimental methods for the assessment of machine reliability at the expense of test conditions approximation to operation loads.

Microstructure evolution in a 2618 aluminium alloy during creep-fatigue tests

2012 ◽  
Vol 103 (6) ◽  
pp. 688-693 ◽  
Author(s):  
František Nový ◽  
Miloš Janeček ◽  
Robert Král ◽  
Branislav Hadzima
Keyword(s):  
Aluminium Alloy ◽  
Microstructure Evolution ◽  
Fatigue Tests ◽  
Creep Fatigue

Elevated Temperature Fatigue Fracture Behaviour of Aluminium Alloy Subjected to Spectrum Loadings

2012 ◽  
Vol 165 ◽  
pp. 219-223
Author(s):  
K.A. Zakaria ◽  
S. Abdullah ◽  
Mariyam Jameelah Ghazali ◽  
C.H. Azhari
Keyword(s):  
Aluminium Alloy ◽  
Fatigue Fracture ◽  
Elevated Temperatures ◽  
Fatigue Testing ◽  
Fracture Behaviour ◽  
Testing Machine ◽  
Fatigue Behaviour ◽  
Fatigue Tests ◽  
Engine Mount ◽  
Load Sequence

This paper discusses the fatigue fracture behaviour of aluminium alloy AA6061-T6 under spectrum loadings at room and elevated temperatures. The load sequence can have a very significant effect in fatigue lives and normally the fatigue strength of material decrease with increasing temperature. In this study, variable amplitude loading (VAL) signal was obtained from the engine mount bracket of an automobile in a normal driving condition. Constant amplitude loading (CAL), high to low and low to high spectrum loadings were then derived from the VAL obtained from the data capturing process to study the fatigue behaviour that subjected to spectrum loadings at the room and elevated temperatures. The fatigue tests were performed according to an ASTM E466 standard using a servo-hydraulic fatigue testing machine. Fatigue fracture surfaces were then sectioned and inspected by employing a high magnification microscope. Results indicated that fracture surface behaviours of specimens were influenced significantly by the load sequence and temperatures, which can be related to the fatigue lives of aluminium alloy under spectrum loadings.

HR-STEM investigation of atomic lattice defects in different types of η precipitates in creep-age forming Al–Zn–Mg–Cu aluminium alloy

2021 ◽  
Vol 815 ◽  
pp. 141213
Author(s):  
Tsai-Fu Chung ◽  
Yo-Lun Yang ◽  
Cheng-Ling Tai ◽  
Makoto Shiojiri ◽  
Chien-Nan Hsiao ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Lattice Defects ◽  
Atomic Lattice ◽  
Different Types ◽  
Creep Age Forming

scholarly journals The Effect of Anodizing Process Parameters on the Fatigue Life of 2024-T-351-Aluminium Alloy

2017 ◽  
Vol 2017 (9) ◽  
pp. 109-115
Author(s):  
Shashidhar K Kudari ◽  
C. M. Sharanaprabhu
Keyword(s):  
Fatigue Life ◽  
Aluminium Alloy ◽  
Process Parameters ◽  
Fatigue Tests ◽  
Process Temperature

AbstractThe effect of an anticorrosive layer on the fatigue life of 2024-T-351-aluminium alloy has been studied in the present investigation. The fatigue tests were conducted on the aluminium alloy with and without anodizing to evaluate the fatigue life. The results indicate that the fatigue life of the anodized specimens is significantly shorter than that of untreated specimens. Further, experiments were conducted to evaluate the effect of the anodizing process parameters on the fatigue life of anodized specimens. These results show that the fatigue life of anodized aluminium alloy can be improved by controlling the anodizing process parameters such as process temperature, voltage, and time of immersion.

scholarly journals Fractography Evaluation of Fracture Surfaces of Aluminium Alloy After Fatigue Tests

2016 ◽  
Vol 16 (5) ◽  
pp. 1199-1204 ◽  
Author(s):  
Denisa Závodská ◽  
Eva Tillová ◽  
Lenka Kuchariková ◽  
Mária Chalupová
Keyword(s):  
Aluminium Alloy ◽  
Fatigue Tests ◽  
Fracture Surfaces

scholarly journals Investigation on Influence of Ultrasonic Impact Treatment (UIT) on Fatigue Life for Aluminium Alloy 2017-T4

2018 ◽  
Vol 21 (1) ◽  
pp. 141 ◽  
Author(s):  
Hussain J. M. Alalkawi ◽  
Aseel A. Alhamdany ◽  
Marib R. Abdul Hassan
Keyword(s):  
Mechanical Properties ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Ambient Temperature ◽  
Aluminium Alloy ◽  
Mechanical Design ◽  
Fatigue Tests ◽  
Strong Tendency ◽  
Ultrasonic Impact Treatment ◽  
Variable Amplitude

Improving fatigue life is one of the most important issues in mechanical design; an investigation has been conducted on Al 2017-T4. Group of samples have been machined and prepared, some of specimens have been treated using the ultrasonic impact treatment (UIT) with one line peening. The fatigue tests were carried out under constant and variable amplitude (R=-1) at ambient temperature, in order to find out the fatigue life S-N curve and strength after treatment. It has been found significant increasing in strength after it was treated by (UIT).  The fatigue strength is improved after treatment up to 4.16% at 107 cycles, enhancement are present with 24% and 18.78% for the cumulative fatigue lives low-high and high–low respectively.  These results also show a strong tendency of increasing of fatigue strength after application of (UIT) with increase in mechanical properties of material used.

scholarly journals Experimental Study on Variable-Amplitude Fatigue of Welded Cross Plate-Hollow Sphere Joints in Grid Structures

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Jin-Feng Jiao ◽  
Hong-Gang Lei ◽  
Y. Frank Chen
Keyword(s):  
Fatigue Life ◽  
Hollow Sphere ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Metallographic Analysis ◽  
Variable Load ◽  
Random Loading ◽  
Variable Amplitude ◽  
Different Types ◽  
Variable Amplitude Fatigue

The fatigue stress amplitude of the welded cross plate-hollow sphere joint (WCPHSJ) in a grid structure varies due to the random loading produced by suspending cranes. A total of 14 specimens considering three different types of WCPHSJs were prepared and tested using a specially designed test rig. Four typical loading conditions, “low-high,” “high-low,” “low-high-low,” and “high-low-high,” were first considered in the tests to investigate the fatigue behavior under variable load amplitudes, followed by metallographic analyses. The experimental and metallographic analysis results provide a fundamental understanding on the fatigue fracture form and fatigue mechanism of WCPHSJs. Based on the available data from constant-amplitude fatigue tests, the variable-amplitude fatigue life of the three types of WCPHSJs was estimated using the Miner rule and Corten-Dolan theory. Since both accumulative damage theories yield virtually same damaging results, the Miner rule is hence suggested to estimate the fatigue life of WCPHSJs.

scholarly journals Fracture and determination of a lifetime of in-service mechanical components with porosity cluster in an aluminium alloy

2019 ◽  
Vol 300 ◽  
pp. 04001
Author(s):  
Julien Vasseur ◽  
Dmytro Vasiukov ◽  
Salim Chaki ◽  
Isabel Huther ◽  
Michel Marzin ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Load Ratio ◽  
Local Stress ◽  
Fatigue Tests ◽  
Spatial Density ◽  
Lifetime Estimation ◽  
Fatigue Lifetime ◽  
Manufacturing Defects ◽  
Tensile Fatigue ◽  
Propagation Law

This paper focuses on the fatigue lifetime estimation of metallic components containing group of porosities as manufacturing defects. In order to represent these defects, six test specimens with different Side Drilled Holes (SDH) clusters, have been made of 7075-T6 aluminium alloy. Main characteristics of such defect (elementary size of porosities, spatial density or gradient of elementary sizes) have been studied by taking it into account in a FEM modelling in fatigue to determine their influence on the lifetime. Experimental tensile fatigue tests have been performed on all SDH samples with load ratio R=0.1. Semi-elliptical surfaces with a size of a typical Mg2Si particle of the studied alloy have been chosen as initial cracks for multiple crack propagation. Indeed, such a particle is often responsible for the initiation of a crack in this type of material. For crack growth, Paris’ type propagation law has been used. Local stress redistribution due to presence of the SDH implies mix-mode behaviour which has been considered by using G-theta method. Simulations results allowed realistic lifetime estimation according to the experimental ones. Moreover, a strong dependency of the crack paths and fatigue lifetime on the defect characteristics has been proved and quantified.

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