Temat: propagation factor - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: FE model for linear-elastic mixed mode loading: estimation of SIFs and crack propagation
Autorzy:: Boulenouar, A
Benseddiq, N.
Mazari, M
Benamara, N
Powiązania:: https://bibliotekanauki.pl/articles/949326.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: crack propagation
stress intensity factor
strain energy density
Opis:: Finite element analysis combined with the concepts of linear elastic fracture mechanics provides a practical and convenient means to study the fracture and crack growth of materials. The onset criterion of crack propagation is based on the stress intensity factor, which is the most important parameter that must be accurately estimated and facilitated by the singular element. The displacement extrapolation technique is employed to obtain the SIFs at crack tip. In this paper, two different crack growth criteria and the respective crack paths prediction for several test cases are compared between the circumferential stress criterion and the strain energy density criterion. Several examples are presented to compare each criterion and to show the robustness of the numerical schemes.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 2; 373-383
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Crack growth path simulation in a cement mantle of THR using crack box technique
Autorzy:: Boulenouar, Abdelkader
Bendida, Nadjet
Powiązania:: https://bibliotekanauki.pl/articles/279575.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: stress intensity factor
crack propagation
orthopedic cement
total hip replacement
Opis:: A numerical method for 2D LEFM crack propagation simulation in a cement mantle of the total hip replacement (THR) is presented. This work is based on the implementation of the displacement correlation technique (DCT) and the maximum circumferential stress (MCS) theory in a finite element code, using the Ansys Parametric Design Language (APDL). At each crack increment length, the crack direction angle is evaluated as a function of stress intensity factors (SIFs). The crack box technique is investigated for crack propagation simulation. The advantage of this technique is facilitation of the automatic remeshing of the structure during crack extension. In this paper, we analyzed the mechanical behavior of cracks initiated in the cement mantle by evaluating the SIFs. The effect of the cavities and the initial crack directions on the crack growth path has been highlighted.
Źródło:: Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 317-329
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A new automated stretching finite element method for 2D crack propagation
Autorzy:: Bentahar, M.
Benzaama, H.
Bentoumi, M.
Mokhtari, M.
Powiązania:: https://bibliotekanauki.pl/articles/279776.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: 2D crack propagation
FEM
stretching finite element method (SFEM)
stress intensity factor (SIF)
Opis:: This work presents a study of crack propagation with a new 2D finite element method with the stretching of the mesh. This method affects at each propagation step new coordinates of each element node of the mesh. The structure is divided to areas and each area has its own coordinate formulas. A program in FORTRAN allows us to create a parametric mesh, which keeps the same number of nodes and elements during different steps of crack propagation. The nodes are stretched using the criterion of maximum circumferential stress (MCS). The fracture parameters such as stress intensity factors in modes I and II and the orientation angles are calculated by solving the problem by the finite element code ABAQUS.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 869-881
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Determination of crack initiation and propagation in two disc shaped specimens using the improved maximum tangential stress criterion
Autorzy:: Eftekhari, M.
Baghbanan, A.
Mohtarami, E.
Hashemolhosseini, H.
Powiązania:: https://bibliotekanauki.pl/articles/949128.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: Extended Finite Element Method (XFEM)
maximum tangential stress (MTS) criterion
improved maximum tangential stress (IMTS) criterion
crack propagation
stress intensity factor
Opis:: The crack initiation angle and propagation path for two different disc shaped test specimens (i.e., SCB and CBD specimen) are investigated experimentally and theoretically. The Maximum Tangential Stress (MTS) criterion does not calculate the crack initiation angle in SCB and CBD specimens correctly. Moreover, at the angles after occurrence of pure mode II, where the stress intensity factor of mode I becomes negative, this criterion is not applicable. Therefore, in this research work, Improved MTS (IMTS) criterion which has been implemented in the extended finite element method and is applicable under tensile and compressive loading conditions to examine the crack propagation path in the aforementioned disc shaped specimens. Furthermore, an experimental study on a cracked Brazilian disc specimen has been conducted at different angles. Results of IMTS criterion in these specimens show that the crack propagation path and the crack initiation angle can be predicted theoretically by using IMTS criterion.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 469-480
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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