Development of fatigue crack growth in real structures

Richard, Hans Albert; Sander, Manuela; Fulland, M.; Kullmer, Gunter

doi:10.1016/j.engfracmech.2007.01.017

Cited by 67 publications

(34 citation statements)

References 4 publications

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“…In general, fatigue cracks exhibit only very small plastic deformations and develop in accordance to the normal stresses within the structure [4], as it is shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 88%

“…In a real structure with existing cracks if the initial orientation of the crack does not correspond to the global stress field, the orientation of the crack changes during the crack growth; it develops perpendicular to the maximum normal stress of the global stress field [4], as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 97%

“…Therefore, knowledge of possible damage events, initiation and growth of cracks is essential [4]. The rate of crack growth is calculated using relationships like Paris-Erdogan model [5],…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Strength criteria at the tip of the crack

Jinescu

Nicolof²

2015

Engineering Fracture Mechanics

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“…In general, fatigue cracks exhibit only very small plastic deformations and develop in accordance to the normal stresses within the structure [4], as it is shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Strength criteria at the tip of the crack

Jinescu

Nicolof²

2015

Engineering Fracture Mechanics

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“…Richard et al have always been focusing on the study of crack growth and developed a criterion for the crack growth direction. The details of explanations can be found from [34,35]. (10) where for , and .…”

Section: Concept and Formulation Of The S-version Femmentioning

confidence: 99%

Fatigue crack growth analysis on square prismatic with embedded cracks under tension loading

Shaari

Ariffin

Takahashi³

et al. 2017

J. MECH. ENG. SCI.

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One of the most important issues yet to be overcome by engineers is the integrity and reliability of engineering structures. This is to ensure the safety of the engineering structure is at the greatest since the catastrophic failures usually occur due to fatigue crack growth. Due to insufficient studies on the fatigue embedded crack growth, the prismatic bar is chosen as the model of the structure. It is wise to select the solid bar since the analysis can be much simpler, thus making it easier to examine the behaviour of the fatigue crack growth. In this study, the metallic square prismatic with embedded cracks is analysed using S-version Finite Element Modelling (S-version FEM) under tension loading. The S-version FEM is an open source program, that is built from codes previously compiled as a program. The S-version FEM structured using the global-local overlay technique consists of two separate global and local meshes. By using the basic concept from the energy release rate and stress intensity factors (SIF), the behaviour of the fatigue crack growth is analysed. From the linear elastic fracture mechanics concept, the SIF is calculated using the virtual crack closure-integral method. The influences of different initial crack size and aspect ratios on the fatigue crack growth are investigated in this study. In addition, the SIF results from the S-version FEM are compared with the analytical solutions. From the analysis, the root mean square errors (RMSE) are performed to support the validation. The RMSE shows a very small error of 0.227, 0.086 and 0.3089 according to the aspect ratio of 0.5, 1.0 and 2.0, respectively. The results also show significant characteristics and behaviour of the SIF trend along the crack front, corresponding to different aspect ratios. From this study, the S-version FEM is suitable to be used to predict the fatigue crack growth for the cracks embedded in a structure. Subsequently, the S-version FEM is an open source program can be modified for increasingly complex engineering problems.

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“…Richard et al focused on the study of crack growth and developed a criterion for crack growth direction. Detailed explanations can be found in [26,27]. Furthermore, the Richard criterion is integrated into the software to ensure that the S-version FEM is able to compute mixed-mode types of loading.…”

mentioning

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.

show abstract

Development of fatigue crack growth in real structures

Cited by 67 publications

References 4 publications

Strength criteria at the tip of the crack

Strength criteria at the tip of the crack

Fatigue crack growth analysis on square prismatic with embedded cracks under tension loading

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

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