Fatigue endurance and crack propagation under rotating bending fatigue tests on aluminum alloy AISI 6063-T5 with controlled corrosion attack

2012 ◽  
Vol 93 ◽  
pp. 119-131 ◽  
Author(s):  
Gonzalo M. Domínguez Almaraz ◽  
Jorge L. Ávila Ambriz ◽  
Erasmo Cadenas Calderón
Keyword(s):  
Aluminum Alloy ◽  
Crack Propagation ◽  
Fatigue Tests ◽  
Corrosion Attack ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Fatigue Endurance

Rotating Bending Fatigue Endurance and Effect of Controlled Corrosion on the AISI-SAE 6063-T5 Aluminum Alloy.

2012 ◽  
Vol 1373 ◽  
Author(s):  
G. M. Domínguez Almaraz ◽  
J. L. Ávila Ambriz ◽  
E. Cadenas Calderón ◽  
J. J. Villalón López
Keyword(s):  
Aluminum Alloy ◽  
Hydrochloric Acid ◽  
Solution Concentration ◽  
Fatigue Tests ◽  
Corrosion Attack ◽  
Bending Fatigue ◽  
Surface Corrosion ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Fatigue Endurance

ABSTRACTRotating bending fatigue test are carried out on the aluminum alloy 6063-T5 for corroded and non corroded specimens. Special attention is devoted to fatigue endurance reduction caused by controlled surface corrosion on corroded specimens. Corrosion attack is implemented by submersion of specimens in an acid solution for: two, four and six minutes in order to induce three degrees of surface corrosion. The corrosion agent is a solution of hydrochloric acid with a PH close to 0.8 and solution concentration of 38%. Rotating bending fatigue tests at frequency of 50 Hz, room temperature and without environmental humidity control are carried out on 4 types of specimens: without corrosion and 2, 4, and 6 minutes immersed in the solution of hydrochloric acid. Results are analyzed regarding the corrosion effect on fatigue endurance and conclusion are enlisted concerning rotating bending fatigue tests and corrosion attack on this aluminum alloy.

Effect of Controlled Corrosion Attack With HCl Acid on the Fatigue Endurance of Aluminum Alloy AISI 6063-T5, under Rotating Bending Fatigue Tests

2012 ◽  
Vol 1485 ◽  
pp. 53-58 ◽  
Author(s):  
G. M. Domínguez-Almaraz ◽  
J. L. Ávila-Ambriz ◽  
F. Peyraut ◽  
E. Cadenas-Calderón
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Fatigue Tests ◽  
Ansys Software ◽  
Corrosion Attack ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Finite Element Numerical Simulation ◽  
Fatigue Endurance

ABSTRACTCorrosion attack is implemented on the aluminum alloy AISI 6063-T5 for six different non corroded and pre-corroded specimens. Concerning pre-corroded specimens, they are divided in two groups; the first one is immersed for 1 and 2 minutes in hydrochloric acid with 20% concentration, and the second group for 2, 4, 6 minutes of immersion but in HCl with 38% of concentration. Rotating bending fatigue tests are carried out on corroded and non-corroded specimens at the frequency of 50 Hz, at room temperature and without control of environmental humidity. Loading conditions are fixed by Finite Element numerical simulation; the loading ranges are 90%, 80%, 70% and 60% of the yield stress of this aluminum alloy. A numerical simulation study is carried out by means of the Ansys software to investigate the stress concentration factor variation induced by the proximity of two close pitting holes: in longitudinal and transversal direction regarding the principal applying loading. Finally, optical microscopy is used to analyze the fracture surfaces in longitudinal and transversal directions, in order to establish possible causes of fatigue fracture.

Stress concentration on artificial pitting holes and fatigue life for aluminum alloy 6061-T6, undergoing rotating bending fatigue tests

2010 ◽  
Vol 1276 ◽  
Author(s):  
Víctor H. M. Lemus ◽  
Gonzalo M. D. Almaraz ◽  
J. Jesús V. Lopez
Keyword(s):  
Aluminum Alloy ◽  
Stress Concentration ◽  
Fatigue Loading ◽  
Fatigue Tests ◽  
Stress Concentrations ◽  
Bending Fatigue ◽  
Aluminum Alloy 6061 ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Alloy 6061

AbstractThis work deals with rotating bending fatigue tests on aluminum alloy 6061-T6, under loading condition close to the elastic limit of the material. Results have been obtained for three types of specimens: without artificial pitting, specimens with one artificial pitting hole and specimens with two neighboring artificial pitting holes. Results show that fatigue endurance is reduced in the case of one pitting hole and considerably for two neighboring pitting holes. In order to explain this behavior, numerical analysis by FE are carried out to determine the stress concentrations for the three types of specimens. It is found that the stress concentration for two neighboring pitting holes is an exponential function of the separation between the two holes, under uniaxial loading. The probability to find two or more neighboring pitting holes in real industrial materials, such as cast iron, corroded or pitting metallic alloys is high; then, the stress concentration for two or more neighboring pitting holes needs to be considered for the fatigue prediction life under fatigue loading and corrosion attack applications.

Rotating Bending Fatigue Tests on Aluminum Alloy AISI-SAE 6061-T6 at High Speed (150 Hz), and Close to Elastic Limit

2009 ◽  
Vol 65 ◽  
pp. 79-88
Author(s):  
Gonzalo Domínguez Almaraz ◽  
Edgar Tapia Silva ◽  
Mauricio Guzmán Tapia ◽  
Jesús Villalón López
Keyword(s):  
Aluminum Alloy ◽  
High Speed ◽  
Elastic Limit ◽  
High Stress ◽  
Fatigue Tests ◽  
Test Machine ◽  
General Description ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

This work deals with rotating bending fatigue tests at high speed (150 Hz), carried out on aluminum alloy AISI-SAE 6061-T6 for which the highest experimental stress inside the specimen is close to the elastic limit of material. Simulation results are obtained by Visual Nastran software in order to determine the numerical stress and strain distributions inside the specimen; then, this information is used for the experimental set up. A general description of experimental test machine and experimental conditions are developed in first sections, following section present the experimental results and discussion about the observed failure origin related to discontinuities and the associated high stress zones. A principal contribution of this work is related to the analysis of fracture surfaces and its correlation with experimental fatigue endurance: a simple model is proposed for the prediction of fatigue life of this aluminum alloy under high speed rotating bending fatigue tests, based on the surface density of associated fatigue macro-plastic deformation zones close the crack initiation.

Fatigue Behaviour of DLC Coated Al 7075-T6 Alloy in an Aggressive Mixture

2014 ◽  
Vol 627 ◽  
pp. 81-84 ◽  
Author(s):  
Sergio Baragetti ◽  
Riccardo Gerosa ◽  
Francesco Villa
Keyword(s):  
High Performance ◽  
Contact Fatigue ◽  
Fatigue Behaviour ◽  
Fatigue Tests ◽  
Structural Elements ◽  
Pvd Coatings ◽  
Bending Fatigue ◽  
Al 7075 ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

7075-T6 aluminium alloy is commonly adopted in high performance structures and components. Its fatigue behaviour is however dramatically worsened by exposure to aggressive environments. The deposition of PVD coatings, which are commonly adopted to increase the surface properties of structural elements in terms of hardness, contact fatigue and wear resistance, could be beneficial also for the fatigue behaviour of a 7075-T6 substrate in an aggressive environment. In the present work, Diamond Like Carbon (DLC) PVD coated 7075-T6 specimens immersed in methanol have been analysed, by means of step-loading rotating bending fatigue tests (R = -1) at 2·105 cycles. Coated specimens were tested in laboratory air for comparison, and uncoated polished samples were studied in both the environments to obtain reference values. SEM micrographs of the fracture surfaces were taken to investigate the effects of the corrosive environment on the failure mechanism.

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