On the coupling of analytical and FEM solution in stress analysis around the polygonal hole shape in a finite two-dimensional domain

Grm, Aleksander; Batista, Milan

doi:10.1016/j.ijmecsci.2016.09.037

Cited by 10 publications

(4 citation statements)

References 11 publications

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“…The steel arch and shotcrete are closely connected to the surrounding rock and undergo deformation together with the surrounding rock [4][5][6][7][8].…”

Section: Basic Assumptionsmentioning

confidence: 99%

“…The displacement of tunnel walls and the bearing capacity of the primary support are important indicators to evaluate the safety of tunnel structures and guide the tunnel support scheme. Generally, engineers will use numerical simulation software to perform calculations [5][6][7][8]. However, due to the computational speed and complexity of numerical simulation software, there is an urgent need to propose a simple and efficient calculation method.…”

Section: Introductionmentioning

confidence: 99%

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Calculation Method for Determining the Wall Displacement and Primary Support Bearing Capacity of Tunnels

Wang

Tan

et al. 2023

Applied Sciences

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The primary support structure of a tunnel often needs various support methods, such as bolts, steel arch frames, and shotcrete. It is of great significance to quickly calculate the displacement of tunnel walls and the bearing capacity of primary supports for guiding construction and ensuring construction safety. In order to solve the above problems, this paper constructs a mechanical model of primary support and analyzes the displacement of a tunnel wall at different construction stages of primary support; based on the Mohr–Coulomb strength criterion, the displacement of the tunnel wall at different stages of the primary support is derived, and the calculation method and process for calculating the bearing capacity of the primary support are given. The accuracy of the proposed method is then verified by an example. Compared with previous methods, the method proposed in this paper considers the support effects of bolts, steel arches, and shotcrete separately and calculates the corresponding displacement of the tunnel wall, which is closer to the actual construction situation. In addition, the bearing capacity of the primary support can be calculated and analyzed. By comparing with the numerical simulation results, it has been proven that the proposed method has a relatively small calculation error. Compared with the numerical simulation results and previous analytical methods, the method proposed in this paper is simpler and faster in calculation; thus, it can quickly assist in the design of tunnel support structures.

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“…The steel arch and shotcrete are closely connected to the surrounding rock and undergo deformation together with the surrounding rock [4][5][6][7][8].…”

Section: Basic Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calculation Method for Determining the Wall Displacement and Primary Support Bearing Capacity of Tunnels

Wang

Tan

et al. 2023

Applied Sciences

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“…The measurement and analysis of the deformation field thus play an important * Author to whom any correspondence should be addressed. role in the safety assessment and optimization design of structures [5,6]. As a widely used full-field measurement method, digital image correlation (DIC) has been adopted in many engineering applications [7,8].…”

Section: Introductionmentioning

confidence: 99%

Automatic ROI recognition and parameters selection for digital image correlation in measuring structures with complex shapes

Cheng¹,

Xing²,

Zhou³

et al. 2023

Meas. Sci. Technol.

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For the digital image correlation (DIC) method, the measurement of specimens with complex shapes may encounter difficulties due to the time-consuming recognition of region of interest (ROI), and the indeterminate parameter selection caused by the non-uniform deformation. This paper proposes an automatic DIC for the measurement of structures with complex shapes. An automatic ROI segmentation is developed by combining a convolutional neural network (CNN) and image morphology, so the boundary of the specimen can be acquired accurately and efficiently. In dealing with the non-uniform deformation, a strain-related automatic selection of DIC parameters is developed, in which the sampling intervals and the subset sizes at different areas can be automatically determined. Both results of the simulated experiment and real experiment show that, by combing the two approaches with segmentation-aided digital image correlation, the proposed automatic DIC can characterize the complex deformation including the boundary of the structures effectively.

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“…Because of the creep, the aluminum material in a temperature lower than 100 o C doesn't have sensitivity and the creep process is not observed [14][15][16][17]. Although stress release doesn't occur suddenly but over time, it still may cause sudden and friable fractures in the part [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

A Study of the Effective Lifetime of Aluminum Buckets Used in Blood Bank Centrifuges

Tafti

Golestani

Salari

2017

Eng. Technol. Appl. Sci. Res.

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Rotating parts of blood bank centrifuges are under heavy mechanical cyclic stresses due to their centrifugal loading conditions. Estimating the effective lifetime for these parts is very important for their application. Providing safety requirements for these components is mandatory in blood transfusion centers (BTC). Failure occurs in the engineering parts for both loading conditions of steady and cyclic. The fatigue phenomenon is the main reason for mechanical failures at least in 90 % of fractures during operation. In this paper, the effects of fatigue caused by centrifugal loadings on aluminum buckets produced by the Iranian Sina Ebtekar Company (ISECo) are investigated experimentally. In this study, 48 aluminum buckets are chosen from a set of 500 buckets. The numbers of service of the samples are accounted for a period of 7 months. Finite element analysis, FEM, is done for an aluminum bucket and the relevant maximum stresses due to the rotating loads of centrifugation are determined. Analyzing the numerical results and using the fatigue, lifetime diagrams according to the number of operating cycles is presented for the samples. A good consistency is observed between the experimental and numerical results. Based on the results, a new correlation is presented for estimating the aluminum bucket’s lifetime made by ISECO.

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On the coupling of analytical and FEM solution in stress analysis around the polygonal hole shape in a finite two-dimensional domain

Cited by 10 publications

References 11 publications

Calculation Method for Determining the Wall Displacement and Primary Support Bearing Capacity of Tunnels

Calculation Method for Determining the Wall Displacement and Primary Support Bearing Capacity of Tunnels

Automatic ROI recognition and parameters selection for digital image correlation in measuring structures with complex shapes

A Study of the Effective Lifetime of Aluminum Buckets Used in Blood Bank Centrifuges

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