scholarly journals Mechanical Properties of Aluminum Alloys under Low-Cycle Fatigue Loading

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2064 ◽  
Author(s):  
Xuehang Zhao ◽  
Haifeng Li ◽  
Tong Chen ◽  
Bao’an Cao ◽  
Xia Li
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Low Cycle Fatigue ◽  
Tensile Loading ◽  
Fatigue Loading ◽  
Element Model ◽  
Cyclic Softening ◽  
Repeated Loading ◽  
Cycle Fatigue

In this paper, the mechanical properties of 36 aluminum alloy specimens subjected to repeated tensile loading were tested. The failure characteristics, stress-strain hysteresis curves and its corresponding skeleton curves, stress cycle characteristics, and hysteretic energy of specimens were analyzed in detail. Furthermore, the finite element model of aluminum alloy specimens under low-cycle fatigue loading was established and compared with the experimental results. The effects of specimen parallel length, parallel diameter, and repeated loading patterns on the mechanical properties of aluminum alloys were discussed. The results show that when the specimen is monotonously stretched to fracture, the failure result from shearing break. When the specimen is repeatedly stretched to failure, the fracture of the specimen is a result of the combined action of tensile stress and plastic fatigue damage. The AA6061, AA7075, and AA6063 aluminum alloys all show cyclic softening characteristics under repeated loading. When the initial stress amplitude of repeated loading is greater than 2.5%, the repeated tensile loading has a detrimental effect on the deformability of the aluminum alloy. Finally, based on experiment research as well as the results of the numerical analysis, the calculation method for the tensile strength of aluminum alloys under low-cycle fatigue loading was proposed.

Elevated Temperature Fatigue of Aluminum Alloy 5454 [Addendum to “Low Cycle Fatigue of Aluminum Alloys”]

1976 ◽  
Vol 4 (5) ◽  
pp. 375
Author(s):  
RL Meltzer ◽  
YR Fiorini ◽  
RT Horstman ◽  
IC Moore ◽  
AL Batik ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Elevated Temperature ◽  
Aluminum Alloys ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue

Fatigue Deformation Behavior of FGH96 Superalloy under Low Cycle Fatigue Loading

2013 ◽  
Vol 641-642 ◽  
pp. 418-422
Author(s):  
Yu Li Gu ◽  
Yu Huai He ◽  
Chang Kui Liu ◽  
Chun Hu Tao
Keyword(s):  
Grain Boundaries ◽  
Fatigue Failure ◽  
Small Angle ◽  
Electron Backscatter Diffraction ◽  
Low Cycle Fatigue ◽  
Fatigue Loading ◽  
Cyclic Stress ◽  
Cyclic Softening ◽  
Cycle Fatigue ◽  
Nickel Based Superalloy

Low cycle fatigue failure tests of the powder metallurgical nickel based superalloy FGH96 at 550°C and 720°C were carried out under total strain-controlled mode (R=-1). The fatigue failure behaviors were investigated by analyzing cyclic stress response and observing microstructure after fatigue through scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The results show that FGH96 superalloy exhibits cyclic stability at 550°C, and cyclic softening afterwards at 720°C with Δε/2=0.4% , and of cyclic softening at 720°C with Δε/2=0.7%. After high temperature low cycle fatigue, the γ′ precipitates are cuboidal for all samples. No coarsening of γ′ precipitates was detected at 550°C and at 720°C with Δε/2=0.4%, but small γ′ precipitates get together to be larger precipitates at 720°C with Δε/2=0.7%. EBSD shows that the continuous small angle grain boundaries are produced during the fatigue. The small angle grain boundaries have a significant increase at 720°C, especially that case at Δε/2=0.7%.

Life time assessment of an aluminum alloy under complex low cycle fatigue loading

2015 ◽  
Vol 57 (2) ◽  
pp. 160-164 ◽  
Author(s):  
Karolina Walat ◽  
Tadeusz Łagoda ◽  
Marta Kurek
Keyword(s):  
Aluminum Alloy ◽  
Low Cycle Fatigue ◽  
Life Time ◽  
Fatigue Loading ◽  
Cycle Fatigue ◽  
Time Assessment

scholarly journals Experimental and numerical analysis of fillet-welded joints under low-cycle fatigue loading by means of full-field techniques

2015 ◽  
Vol 229 (7) ◽  
pp. 1327-1338 ◽  
Author(s):  
Pasqualino Corigliano ◽  
Vincenzo Crupi ◽  
Wolfgang Fricke ◽  
Nils Friedrich ◽  
Eugenio Guglielmino
Keyword(s):  
Finite Element ◽  
Low Cycle Fatigue ◽  
Base Material ◽  
Fatigue Loading ◽  
Element Model ◽  
Image Correlation ◽  
Cycle Fatigue ◽  
Full Field ◽  
Field Techniques ◽  
The Finite Element Model

The welded structures used in the naval field are generally subjected to fluctuating stress over time. In some structural welded details, due to changing loading conditions, significant elastic-plastic deformation can arise, which may lead to the failure of the structure after a relatively low number of cycles. The aim of this scientific work was to investigate the behavior of welded T-joints under low-cycle fatigue using full-field techniques: digital image correlation and infrared thermography. Low-cycle fatigue tests were carried out on welded “small-scale” specimens with the aim of obtaining loading and boundary conditions similar to those that occur in “large-scale” components in their real operating conditions. A nonlinear finite element analysis was also performed. The material curves, relative to different zones (base material, heat-affected zone, weld), were obtained by hardness measurements, which were done by means of a fully automated hardness scanner with high resolution. This innovative technique, based on the ultrasonic contact impedance method, allowed to identify the different zones (base material, heat-affected zone, weld metal) and to assess their cyclic curves, which were considered in the finite element model. Finally, the finite element model was validated experimentally comparing the results with the measurements obtained using the digital image correlation technique. The applied procedure allows providing useful information to the development of models for the prediction of fracture and fatigue behavior of the welded joints under the low-cycle fatigue loading.

A Multi-Level Low Cycle Fatigue Damage Model for Forging Die Material

2006 ◽  
Vol 514-516 ◽  
pp. 804-809
Author(s):  
S. Gao ◽  
Ewald Werner
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Low Cycle Fatigue ◽  
Damage Model ◽  
Fatigue Loading ◽  
Cycle Fatigue ◽  
Die Material ◽  
Multi Level ◽  
Loading Sequence ◽  
Forging Die

The forging die material, a high strength steel designated W513 is considered in this paper. A fatigue damage model, based on thermodynamics and continuum damage mechanics, is constructed in which both the previous damage and the loading sequence are considered. The unknown material parameters in the model are identified from low cycle fatigue tests. Damage evolution under multi-level fatigue loading is investigated. The results show that the fatigue life is closely related to the loading sequence. The fatigue life of the materials with low fatigue loading first followed by high fatigue loading is longer than that for the reversed loading sequence.

The Effect of Heat Treatments and Nickel Additive on The Microstructure and Hardness of 7075 Aluminum Alloy

2019 ◽  
Vol 7 (2) ◽  
pp. 34-41
Author(s):  
Mahmoud Alasad ◽  
Mohamad Yahya Nefawy
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Artificial Aging ◽  
Heat Treatments ◽  
7075 Aluminum Alloy ◽  
Nickel Additive

The aluminum alloys of the 7xxx series consist of Al with Zn mainly, Mg and Cu. 7xxx aluminum alloys has high mechanical properties making it distinct from other aluminum alloys. In this paper, we examine the effect of adding Nickel and heat treatments on the microstructure and hardness of the 7075 aluminum alloy. Were we added different percentages of nickel [0.1, 0.5, 1] wt% to 7075 Aluminum alloy, and applied various heat treatments (artificial aging T6 and Retrogression and re-aging RRA) on the 7075 alloys that Containing nickel. By applying RRA treatment, we obtained better results than the results obtained by applying T6 treatment, and we obtained the high values of hardness and a smoother microstructure for the studied alloys by the addition of (0.5 wt%) nickel to alloy 7075.

Deformation Mechanisms of CoCrFeMnNi High-Entropy Alloy Under Low-Cycle-Fatigue Loading

2021 ◽  
Author(s):  
Kaiju Lu ◽  
Ankur Chauhan ◽  
Aditya Srinivasan Tirunilai ◽  
Jens Freudenberger ◽  
Alexander Kauffmann ◽  
...  
Keyword(s):  
Low Cycle Fatigue ◽  
Fatigue Loading ◽  
Deformation Mechanisms ◽  
High Entropy Alloy ◽  
Cycle Fatigue ◽  
High Entropy

Evaluation of the Heat Treatment Role for Light Aluminum Alloys Subjected to Creep and Low Cycle Fatigue

2010 ◽  
Vol 638-642 ◽  
pp. 455-460 ◽  
Author(s):  
A. Rutecka ◽  
L. Dietrich ◽  
Zbigniew L. Kowalewski
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Low Cycle Fatigue ◽  
Numerical Models ◽  
Cyclic Hardening ◽  
Fatigue Tests ◽  
Cycle Fatigue ◽  
Lower Stress ◽  
Creep Tests ◽  
Different Temperatures

The AlSi8Cu3 and AlSi7MgCu0.5 cast aluminium alloys of different composition and heat treatment were investigated to verify their applicability as cylinder heads in the car engines [1]. Creep tests under the step-increased stresses at different temperatures, and low cycle fatigue (LCF) tests for a range of strain amplitudes and temperatures were carried out. The results exhibit a significant influence of the heat treatment on the mechanical properties of the AlSi8Cu3 and AlSi7MgCu0.5. An interesting fact is that the properties strongly depend on the type of quenching. Lower creep resistance (higher strain rates) and lower stress response during fatigue tests were observed for the air quenched materials in comparison to those in the water quenched. Cyclic hardening/softening were also observed during the LCF tests due to the heat treatment applied. The mechanical properties determined during the tests can be used to identify new constitutive equations and to verify existing numerical models.

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