XFEM study of crack propagation in logs after growth stress relaxation and drying stress accumulation

Hu, Xiaoyong; Liu, Z. L.; Zhuang, Zhuo

doi:10.1007/s00226-017-0943-4

Cited by 9 publications

(4 citation statements)

References 25 publications

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“…The discontinuous jump function across the crack surface and the asymptotic crack tip function is given by Eqs. ( 2) and (3) [13,15].…”

Section: Numerical Simulation 31 Xfem Methodsmentioning

confidence: 99%

“…The boundary condition is set as a gradually increased radial displacement at the inner boundary. That is so because the loading method controlled by displacement is more stabilized than the force-controlled loading method in XFEM analysis [13].…”

Section: Simulation Modelmentioning

confidence: 99%

“…To estimate the load-bearing capacity of glued laminated timber, Berg et al modeled the cracking behavior of beams by XFEM [12]. Hu et al simulated the crack propagation in crosssections of wood logs caused by relaxed growth stress and accumulated drying stress [13]. It was demonstrated that the crack behavior is closely related to the maximum principal stress and critical fracture energy of wood logs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Modelling of Drying Induced Cracks in Wood Discs Using the Extended Finite Element Method

Fu¹,

Zhou²,

Yan³

et al. 2023

Journal of Renewable Materials

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Drying crack is a common phenomenon occurring during moisture discharge from wood, reducing efficient wood utilization. Drying crack is primarily caused by drying stress, and the reasonable methods for determining drying stress are sparse. In this study, the initiation and propagation of cracks during wood discs drying were simulated using the extended finite element method (XFEM). The distribution of drying stress and displacement was analyzed at different crack conditions based on the simulation results. This study aimed to solve the problem of the limitation of drying stress testing methods and provide a new idea for the study of wood drying stress. The numerical simulation results are found in good agreement with the experimental results, thus corroborating the feasibility of XFEM in modeling drying crack of wood discs. The stress concentration was observed at the crack tip region, while a minor stress was presented in the region of crack passing through, indicating that the crack formation process was also a process of releasing drying stress. Further, more energy was required to form double cracks in comparison with the single crack mode.

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“…The discontinuous jump function across the crack surface and the asymptotic crack tip function is given by Eqs. ( 2) and (3) [13,15].…”

Section: Numerical Simulation 31 Xfem Methodsmentioning

confidence: 99%

Section: Simulation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Modelling of Drying Induced Cracks in Wood Discs Using the Extended Finite Element Method

Fu¹,

Zhou²,

Yan³

et al. 2023

Journal of Renewable Materials

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show abstract

“…Therefore, different SIF's are created and the structure tolerates different loading conditions from pure mode I to pure mode II. SIF's are extracted using conventional finite element software [6][7][8][9][10]. SIF's depend on the mechanical properties of orthotropic material.…”

Section: Introductionmentioning

confidence: 99%

Presentation of a new wood test specimen to investigate the fracture behavior of orthotropic materials under mixed-mode I/II loading

Fakoor

Khali

2022

Preprint

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In this paper, a new test specimen as "Center Notched Disk Tension (CNDT)" to study mode I and II stress intensity factors (SIF’s) in orthotropic materials is presented. In the field of Fracture Mechanics, mode I and II SIF’s play an important role to describe the stress distribution. In CNDT specimens, for crack along the fibers, mode mixity is created by changing the loading direction. Also, by changing the crack-fibers direction for the desired crack-load, various mode mixity can be created. For desired crack-fiber angle, by changing the loading share, different mode mixities are created. Thus, the crack kink changes the loading shares. In this analysis, a comprehensive study is performed on the influence of crack-fibers orientation and crack-loading direction on SIF’s. For the first time, SIF’s are presented for cracked orthotropic specimens in different crack-fibers and crack-loading directions. SIF’s are estimated using the Finite Element Method (FEM). The presented specimen is standardized using a unite load in different directions. The crack length is assumed to be constant. Analytical relationships are also presented for the crack tip parameters in mode I and II. Pure mode I and II conditions are investigated based on SIF’s. Due to the difficulty of establishing pure mode II conditions, it is possible to establish pure mode II conditions at certain crack-fiber and load-crack angles. In these situations, mode II SIF’s can be extracted. The obtained results are validated using reported results in the literature.

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Experimental study on crack initiation and propagation of wood with LT-type crack using digital image correlation (DIC) technique and acoustic emission (AE)

Zhao

et al. 2021

Wood Sci Technol

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XFEM study of crack propagation in logs after growth stress relaxation and drying stress accumulation

Cited by 9 publications

References 25 publications

Numerical Modelling of Drying Induced Cracks in Wood Discs Using the Extended Finite Element Method

Numerical Modelling of Drying Induced Cracks in Wood Discs Using the Extended Finite Element Method

Presentation of a new wood test specimen to investigate the fracture behavior of orthotropic materials under mixed-mode I/II loading

Experimental study on crack initiation and propagation of wood with LT-type crack using digital image correlation (DIC) technique and acoustic emission (AE)

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