Temat: propagation factor - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of the beam quality of a multi-Gaussian Schell-model vortex beam in atmospheric turbulence
Autorzy:: Suo, Qiangbo
Cui, Zhiwei
Han, Yiping
Powiązania:: https://bibliotekanauki.pl/articles/174273.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: multi-Gaussian Schell-model vortex beams
propagation factor
turbulent atmosphere
Opis:: Analytical formulas of the angular width and propagation factor of a multi-Gaussian Schell-model vortex (MGSMV) beam through atmospheric turbulence are derived on the basis of the extended Huygens–Fresnel integral and second-order moments of Wigner distribution function. Evolution properties of the angular width and propagation factor of MGSMV beams propagating in atmospheric turbulence are investigated numerically. The results show that a multi-Gaussian Schell-model beam is more affected by atmospheric turbulence than a MGSMV beam, which will be useful for the practical application of the MGSMV beam.
Źródło:: Optica Applicata; 2019, 49, 2; 191-202
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Simulating Crack Propagation of a Selected Structural Component of the PZL-130 Orlik TC-II Aircrafts
Autorzy:: Jankowski, K.
Reymer, P.
Powiązania:: https://bibliotekanauki.pl/articles/97905.pdf
Data publikacji:: 2014
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:: structural integrity
crack propagation simulation
geometry correction factor
Opis:: This paper presents the process of estimating crack propagation within a selected structural component of the PZL-130 Orlik TC-II using a numerical model. The model is based on technical drawings and measurements of the real structure. The proper definition of the geometry, including the location and size of the gap between elements, is significant for mesh generation. During the simulation process the gap is combined node by node. Each time, the strain energy release rate (G) is calculated. The stress intensity factor and geometry correction factor are defined for consecutive crack lengths, and used further on to estimate crack propagation.
Źródło:: Fatigue of Aircraft Structures; 2014, 6; 119-127
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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: 4.

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: 5.

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: 6.

Tytuł:: Stress Intensity Factor Analysis and Fatigue Behavior of A Crack in The Residual Stress Field of Welding
Autorzy:: Terada, H.
Powiązania:: https://bibliotekanauki.pl/articles/97909.pdf
Data publikacji:: 2011
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:: stress intensity factor analysis
crack
residual stress field
butt weld
stress redistribution
fatigue crack
crack propagation
Opis:: This paper deals with the behavior of a crack in the residual stress field induced by the butt weld in a wide plate. It is known that the distribution form of residual stress has similarities regardless of the welding process, although the size and the magnitude of the residual stress depend largely on the welding process. Stress intensity factor and stress redistribution induced by the crack extension were calculated for a crack with arbitrary length and location. The stress redistributions caused by crack extension obtained by the present analysis showed good agreement with the experimental data. Fatigue crack propagation behavior in the residual stress field reported by Glinka was also examined from ΔK point of view. The effect of residual stress on the fatigue crack propagation rate is considered to be the effect of varying mean stress. It was shown that fatigue crack propagation rate is estimated by the following equation with reasonable accuracy.
da/dn=CΔF^α(1+ σ₀/Δσ F_res)
In the above equation, material constants C and α of Paris’s law are experimentally obtained by using specimens without the weld joint.
Źródło:: Fatigue of Aircraft Structures; 2011, 3; 5-15
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

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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