An Efficient CDEM-based method to calculate full time-space natural fragment field of shell-bearing explosives

Haozhe, Wang; Yu, Anfeng; Feng, Chun; Ling, Xiaodong; Chen, Guoxin; Gu, Meng; Zhu, Xing

doi:10.1016/j.ijimpeng.2021.104099

Cited by 13 publications

(3 citation statements)

References 18 publications

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“…The CDEM [17,18] method is an explicit dynamic numerical method that couples finite and discrete elements. The CDEM method establishes the control equations based on the Lagrangian energy system.…”

Section: Continuum-discontinuum Element Methods (Cdem)mentioning

confidence: 99%

Wind Field Digital Twins Sandbox System for Transmission Towers

Zhang,

Li,

Feng

et al. 2023

Sensors

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Given the digitalization trends within the field of engineering, we propose a practical approach to engineering digitization. This method is established based on a physical sandbox model, camera equipment and simulation technology. We propose an image processing modeling method to establish high-precision continuous mathematical models of transmission towers. The calculation of the wind field is realized by using wind speed calculations, a load-wind-direction-time algorithm and the Continuum-Discontinuum Element Method (CDEM). The sensitivity analysis of displacement- and acceleration-controlled transmission tower loads under two different wind direction conditions is conducted. The results show that the digital model exhibits a proportional relationship with the physical dimensions of the transmission tower model. The error between the numerical simulation results and the experimental results falls within a reasonable range. Nodes at higher positions of the transmission tower experience significantly higher forces compared to those at lower positions, and the structural forms with larger windward projected areas yield similar simulation results. The proposed digital twin system can help monitor the performance of structural bodies and assess the disaster degree in extreme conditions. It can guide specific maintenance and repair tasks.

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Section: Continuum-discontinuum Element Methods (Cdem)mentioning

confidence: 99%

Wind Field Digital Twins Sandbox System for Transmission Towers

Zhang,

Li,

Feng

et al. 2023

Sensors

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“…The continuous-discontinuous element method (CDEM) is a numerical analysis framework with explicit integration built based on the Lagrange equation [31][32][33]. The elements adopted in this work include deformable block and interface elements, see Figure 1.…”

Section: Continuous-discontinuous Element Methodsmentioning

confidence: 99%

A Novel Continuous-Discontinuous Multi-Field Numerical Model for Rock Blasting

et al. 2022

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During blasting, rock failure is caused by blasting wave and explosive gas pressure, as a multi-field coupled process. Most numerical models focus on the effect of blasting wave where the gas pressure is commonly accounted for by empirical relations, ignoring the penetration and permeation of gas flow in cracks. This can underestimate the failure region. In this work, a novel multi-field model is developed in the framework of a continuous-discontinuous element method (CDEM), which is a coupled finite-discrete method with explicit integration strategy. The deformation and cracking of rock mass and the distribution of gas pressure are captured. The proposed method is verified by comparing the results to other results provided in published literature. Especially, by simulating the cases with blocked and unblocked blasting hole, we found that: (i) The fracture degree of the case with blocked blasting hole was 30% higher than that of the unblocked blasting hole. (ii) The radial main cracks in the fracture area are mainly caused by the explosive gas, and the tiny and dense cracks near the hole are induced by the explosion stress wave. (iii) The explosion crushing zone is mainly formed by the action of explosion stress wave, while the crack zone is formed by the combined action of the explosion stress wave and explosive gas. The proposed method provides a useful tool to properly simulate a rock blasting process.

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“…When the block is damaged, the virtual interface provides a channel for the extension and expansion of potential cracks inside the block [30,31]. Therefore, the interface can be used to characterize the continuous and discontinuous physical properties of the material [32,33], such as displacement and damage [34].…”

Section: Continuous-discontinuous Analysis and Calculation Modelmentioning

confidence: 99%

Intelligent optimization for a full-sized PDC bit with composite percussive rock breaking drilling

Li,

Liu,

Zhou

et al. 2023

Journal of Intelligent Construction

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Keywordsfull-sized drill bit composite impact continuous-discontinuous intelligent optimization of parameters numerical simulationIntelligent drilling has obtained a lot of attention in mining engineering, oil and gas production, and tunnelling engineering. The optimization of drilling parameters is one of the most important technologies of intelligent drilling while determining the key values to improve the drilling efficiency is still a difficulty. In this paper, we established a composite percussive rock breaking model of a full-size polycrystalline diamond compact (PDC) bit based on the continuous-discontinuous element method (CDEM). The evolution of rock fragmentation under the action of composite impact is analysed by the rock breaking volume and the torque applied on the drill bit during drilling. Based on actual construction, two key parameters, axial impact velocity and impact frequency, affecting the process of composite impact rock breaking were selected, to further investigate their effect on composite impact rock breaking. The fitting curves obtained from the sensitivity analysis of the rock breaking effect under different construction parameters were proposed to guide the intelligent drilling. Furthermore, the construction parameters of a diversion inclined shaft in the #2 construction branch hole of Tiantai Mountain pumped storage power station in Zhejiang Province were collected, which provides validation data for the proposed optimizing theory of the drilling parameters.

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An Efficient CDEM-based method to calculate full time-space natural fragment field of shell-bearing explosives

Cited by 13 publications

References 18 publications

Wind Field Digital Twins Sandbox System for Transmission Towers

Wind Field Digital Twins Sandbox System for Transmission Towers

A Novel Continuous-Discontinuous Multi-Field Numerical Model for Rock Blasting

Intelligent optimization for a full-sized PDC bit with composite percussive rock breaking drilling

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