Fatigue and crack-growth analyses on 7075-T651 aluminum alloy coupons under constant- and variable-amplitude loading

Newman, James C.; Anagnostou, Elias L.; Rusk, David

doi:10.1016/j.ijfatigue.2013.04.020

Cited by 45 publications

(36 citation statements)

References 29 publications

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“…Tensile yield and ultimate strengths in the longitudinal direction were 508 and 598 MPa respectively. The plane strain fracture toughness was 33 MPa√m, and conventional FCP data for stressing in moist air were reported [55], each for the L-T crack orientation.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The expected two regime da/dN versus K response was observed for 7075-T651 (L-T) subjected to three loading conditions centered on continuously decreasing K, Figure 1. [55]; see x in Figure 2. Growth rates at K of 3 MPa√m exhibit more than a two order of magnitude increase in da/dN with P H2O /f increasing from 3 x 10 -4 to 100 Pa-s for a single CT specimen.…”

Section: Fatigue Crack Growth Kineticsmentioning

confidence: 99%

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Effect of water vapor pressure on fatigue crack growth in Al–Zn–Cu–Mg over wide-range stress intensity factor loading

Burns

Bush

et al. 2015

Engineering Fracture Mechanics

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Fatigue Crack Growth Kineticsmentioning

confidence: 99%

Effect of water vapor pressure on fatigue crack growth in Al–Zn–Cu–Mg over wide-range stress intensity factor loading

Burns

Bush

et al. 2015

Engineering Fracture Mechanics

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“…Aluminium alloy of 7075-T6 was chosen as a material in this experiment. This type of material, aluminium alloy of 7075-T6 series, is used to make aircraft, especially the wings on a naval aircraft (Newman et al, 2013).…”

Section: Data Measurementmentioning

confidence: 99%

“…The semi-elliptical shapes were formed due to the nature of the fatigue crack growth and the dimension of the material. These particles or clusters are represented as semicircular shape (Newman et al, 2013;Náhlík et al, 2017). This paper only focuses on the initial crack part, which is the first semi-elliptical flaw.…”

Section: Data Measurementmentioning

confidence: 99%

Statistical distribution for initial crack and number of loading in fatigue crack growth process

Januri

2017

Int. j. adv. appl. sci.

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A statistical distribution for crack growth technique is one of the important issues emerging from the fatigue crack propagation process. This study aims to compare three different statistical distributions for providing the best modelling of the fatigue data. The normal, the lognormal and the Weibull distribution are compared for determining a better fit for the variables. Kolmogorov-Smirnov has been chosen as the criterion of the best distribution of the variables. Ten replicate specimens of aluminium alloy A7075-T6 in constant amplitude crack tests were conducted. The number of cycles for the formation of the initial crack and initial crack length were taken as random variables. A Bootstrap approach was applied for ensuring that the chosen distribution was the best representative for this type of variables since small data was incorporated in this analysis, it was not suitable to justify the true population. Thus, the result showed that the lognormal distribution was the best distribution to represent the number of cycles and the length of the initial crack. It was found that whether the normal and lognormal types were suitable for those variables, the lognormal was more conservative for these types of variables. These two variables played the main role in life prediction. Therefore, an analysis of the statistical distribution is highly important. It is believed that these results lead to the significant prediction of fatigue lifetime.

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“…The aluminum 7075-T6 is one of the most highly used materials for automotive components due to its high strength. This material is mainly used in automotive components including aircraft wing manufacturing [1,2].…”

Section: Introductionmentioning

confidence: 99%

Prediction of fatigue crack growth for semi-elliptical surface cracks using S-version fem under tension loading

Shaari

Akramin

Ariffin³

et al. 2016

J. MECH. ENG. SCI.

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The finite element method (FEM) is commonly used is solving engineering problems including fatigue crack growth. The S-version FEM is an extended version of the FEM to predict fatigue crack growth. This method was developed into open-source software written in C/C++ language and built based on the UNIX operating system. The objective of this study is to perform a prediction for fatigue crack growth using the S-version FEM. This S-version FEM was structured using the global-local overlay technique that consisted of two separate meshes for global and local. Therefore, the computation process was solely focused on the local area instead of whole geometries. This undoubtedly reduced computation time and dependency on conventional FEM software. The geometry of the problem was modelled in FAST (pre-post) program and referred to as a global mesh, and the mesh was automatically generated in FAST. The location of the crack refers to the local mesh and at this stage smaller elements and finer mesh were made at the crack area. Local mesh was overlaid with global mesh. Then the global-local overlay approach was used to compute the engineering problem. The stress intensity factor (SIF) was calculated using the virtual crack closure-integral method (VCCM). The prediction of the fatigue crack growth results are shown in this study as well as the behaviour of the SIF corresponding to the crack growth. Analytical solutions were compared with the Sversion FEM to validate the results. A very good agreement was presented between the S-version FEM and analytical approach for the normalised SIF. In addition, regression analysis was performed to support the evidence. From the analysis, very small root mean square errors (RMSE) of 0.12 with high correlation coefficient (R 2 ) of 99.74% were shown to confirm the findings. From this study, it can be concluded that the S-version FEM is suitable to be used to predict fatigue crack growth for semi-elliptical surface cracks. The application of the S-version FEM benefits the user because using the overlay approach shortens the computation process.

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Fatigue and crack-growth analyses on 7075-T651 aluminum alloy coupons under constant- and variable-amplitude loading

Cited by 45 publications

References 29 publications

Effect of water vapor pressure on fatigue crack growth in Al–Zn–Cu–Mg over wide-range stress intensity factor loading

Effect of water vapor pressure on fatigue crack growth in Al–Zn–Cu–Mg over wide-range stress intensity factor loading

Statistical distribution for initial crack and number of loading in fatigue crack growth process

Prediction of fatigue crack growth for semi-elliptical surface cracks using S-version fem under tension loading

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