Temat: xFEM - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: XFEM simulation of the influence of cracking introduced by pre-loading on the strengthening of a cement treated mixture
Autorzy:: Brzeziński, K.
Powiązania:: https://bibliotekanauki.pl/articles/279923.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: fatigue life
cement-treated base layers
strengthening effect
load history
XFEM
Opis:: The paper attempts to explain the phenomenon of a static strength increase due to the previous cyclic loading. Finite Element Method simulation of the potential strengthening mechanism is presented. The crack growth is controlled by the energy criterion used in the linear fracture theory. A wedge splitting test has been performed in order to determine the critical energy release rate of the tested mixture GIC . It was observed that the appearance of additional cracks in the material may lead to an increase of its strength. Analysis of the tensile stress distribution allows for a qualitative explanation of the observed phenomenon.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 927-938
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Study of calculation method of pure mode II stress intensity factor of fine-grained concrete using different numerical models
Autorzy:: Zhou, Changlin
Peng, Bo
Deng, An
Gao, Xiaofeng
Li, Yaojia
Zhou, Lei
Zhu, Zheming
Powiązania:: https://bibliotekanauki.pl/articles/1839720.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: fine-grained concrete
critical stress intensity factor
J-integral
anti-symmetrical four-point bending
FEM
XFEM
Opis:: Measuring and calculating methods of critical stress intensity factors (SIFs) have become hot topics which attracted large attention recently. In this work, anti-symmetrical four-point bending tests of cracked fine-grained concrete specimens were conducted experimentally and numerically by using a computer-controlled universal testing machine and ABAQUS code. A comparative study of the calculation method of pure mode II stress intensity factor of a fine-grained concrete was performed by utilizing the conventional finite element method (FEM) in two and three dimensions as well as the extended finite element method (XFEM) in three dimensions. The results show that in three-dimensional models, the crack mode is closest to the pure mode II at the center of specimen thickness. Pure mode II stress intensity factors obtained by SEAM2D and XFEM3D are 1.013 and 1.0617 times that by SEAM3D, respectively. Pure mode II stress intensity factors of the fine-grained concrete obtained by the conventional FEM are more stable than that by XFEM. The number of mesh circles has slight influence on the calculation results of pure mode II stress intensity factor.
Źródło:: Journal of Theoretical and Applied Mechanics; 2021, 59, 2; 251-264
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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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