Stress intensity factors for cusp-type crack problem under mechanical and thermal loading

Chen, F M; Chao, Ching‐Kong; Chiu, Chenchun; Noda, Nao–Aki

doi:10.1093/jom/ufaa028

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…The interaction between a lip-shaped crack and a screw dislocation was also investigated by elasticity solutions [11]. The Stress intensity factor around the cusp-type hole was analytically investigated under mechanical and thermal loading [12].…”

Section: Introductionmentioning

confidence: 99%

Stress Intensity Factor and T-stress in Lip-shaped Cracks in finite and infinite plates

Moradi,

Hosseini,

Yaghobifar

et al. 2024

Preprint

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Lip-shaped holes are conventionally seen in industrial sheet structures. Due to the notch-type cusp in these holes, the stress intensity around the cusp is the main reason for failure. Hence, the stress intensity factor investigation is crucially important in these holes. The current study focuses on the stress intensity factor around lip-shaped holes in finite and infinite sheets using numerical and experimental methods. In the first step, the stress intensities around a lip-shaped hole with various geometry in infinite sheets were numerically determined by the ANSYS software. Then, focusing on the finite sheet, the effect of sheet size and hole geometry on the stress intensity factor were investigated in finite sheets. Results were in great agreement with the analytical solutions proposed in the literature. In this section, the T-stress parameter was also determined in all cases. The T-stress in most cases considerable, meaning that this parameter must be taken into account in industrial design and assessments. In the second step, the digital image correlation technique was employed for validation. Three specimens with various hole geometries were tested, and the validation was successfully done.

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Section: Introductionmentioning

confidence: 99%

Stress Intensity Factor and T-stress in Lip-shaped Cracks in finite and infinite plates

Moradi,

Hosseini,

Yaghobifar

et al. 2024

Preprint

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“…On the other hand, (Lepretre et al, 2021) used the finite element method to deal with the) SIF( evaluation of a repaired cracked steel plate using semi-empirical analysis. General solutions of stress intensity factors (SIF) have been presented for the problem of an edge-like crack under uniform mechanical and thermal loads over a given distance (Chen et al, 2021). There are other methods that helped evaluate the stress intensity factor (SIF) and J integral for centred crack on an elastoplastic material (Bentahar, 2023) and the initial crack propagation problem Bentahar, 2024).…”

Section: Introductionmentioning

confidence: 99%

2D numerical modeling of crack propagation using SFEMD method of a LEHI material

Bentahar,

Youcef,

Mahmoudi

et al. 2024

SEES

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Numerical methods today play a useful and important role in solving various problems related to fracture mechanics including modeling crack propagation, fretting fatigue and cohesion... Furthermore, these methods have been widely used to solve problems in linear and nonlinear fracture mechanics in cases of elastic, plastic fracture problems. The evaluation of stress intensity factor in 2D and 3D geometries, thus these techniques widely used for non-standard crack configurations. The objective of this work is study the effects of the crack length and the number of structural elements on the two crack parameters such as the stress intensity factor KI and KII and the contour integral (J). As well as presenting a numerical modeling of crack propagation, for a LEHIM (Linear Elastic Homogeneous Isotopic Material) with mechanical characteristics by the method SFEMD (Stretching Finite Element Method Developed), the model chosen with quadratic elements with 4 nodes (CPE4). However, this method is based on the effect of the number of contours and the number of elements around the crack tip on the variation of the stress intensity factors. In addition, the crack propagation criterion (MCSC) was used, a computer program was created in FORTRAN language to develop and evaluate the stress intensity factors and the contour integral (J). Several examples of crack lengths a = 0.7, 1.4, 2.1, 2.8 and 3.5 mm were used. Additionally, the number of items has been changed several times. The stress intensity factors of modes I and II and direction angles (α) are calculated to solve the problem using the ABAQUS finite element code. The results obtained by the SFEMD method and the results of the analytical method are very close.

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“…The problem of SIF calculating under thermal load is considered in a number of scientific papers of different years. The most attention is paid to the development of analytical methods [1,5,6,10,12,19], in particular taking into account the structure of the material [1,19] or specific crack shape [5,6]. In article [12] the use and calculation of two-dimensional thermal J*-integral for linear thermoelastic materials using the finite element method (FEM) is discussed.…”

Section: Introductionmentioning

confidence: 99%

Assesment of the temperature loading influence on crack resistance of a tank with a semi-eliptical crack

Pyskunov

Goncharenko²,

Shkryl³

2022

OMTC

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Reservoir parks are the main place of storage of petroleum products. There has been a tendency transition to the use of larger tanks in recent years, which is economically justified. However, it is leads to fire risk increase to accumulate large quantities of petroleum products. Tank fire is one of the most dangerous emergency event, which can lead not only to significant material damage but also to ecological human losses in case of spreading of fire to other tanks. To ensure safety and test the bearing capacity in these conditions determination of the stress-strain state in such tanks must be performed taking into account the temperature load. If there is an initial crack in the tank wall the assessment of crack resistance should be performed. In a previous work the authors determined the stress intensity factor (SIF) distribution along the semi-elliptical crack front in the RVS-5000 tank under hydrostatic pressure. The estimation of a stress-strain state of a steel vertical tank with an initial semi-elliptical crack under the thermal loading is performed in this article. It is suppoused that the part of wall of the tank, located closest to the fire epicenter, is heated unevenly in height: from 300 degrees at the top to 200 degrees at the bottom. On the other part of the tank the temperature reaches 70 degrees. The temperature within wall thickness is considered constant. Given the asymmetric nature of the temperature distribution, a discrete model was developed for the entire tank. After determining the stress-strained state in the whole tank under hydrostatic pressure and temperature load, a fragment with a semi-elliptical crack was calculated separately. The stresses determined from the calculation of the whole tank are used like an external load, applied on fragment boundaries. The difference of results of direct and energetic method of SIF calculation are in the range of 5%. Taking into account the temperature loading leads to an increase in the SIF values by about 20 % in comparison to the results of the calculation only under hydrostatic pressure.

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Stress intensity factors for cusp-type crack problem under mechanical and thermal loading

Cited by 8 publications

References 18 publications

Stress Intensity Factor and T-stress in Lip-shaped Cracks in finite and infinite plates

Stress Intensity Factor and T-stress in Lip-shaped Cracks in finite and infinite plates

2D numerical modeling of crack propagation using SFEMD method of a LEHI material

Assesment of the temperature loading influence on crack resistance of a tank with a semi-eliptical crack

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