Computational Particle Mechanics最新文献_第9页

Numerical study on failure mechanism and acoustic emission characteristics of granite after thermal treatment 花岗岩热处理后破坏机制及声发射特性数值研究

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-02-16 DOI: 10.1007/s40571-023-00556-3

Yike Dang, Zheng Yang, Xiaoyu Liu, Chunting Lu

{"title":"Numerical study on failure mechanism and acoustic emission characteristics of granite after thermal treatment","authors":"Yike Dang, Zheng Yang, Xiaoyu Liu, Chunting Lu","doi":"10.1007/s40571-023-00556-3","DOIUrl":"10.1007/s40571-023-00556-3","url":null,"abstract":"<div><p>To investigate the strength characteristics and failure mechanism of granite after thermal treatment are critical for geothermal energy storage and development. Acoustic emission (AE) is widely used to deduce the process of rock crack generation, development and penetration in laboratory tests, thus revealing the mechanism of rock failure. However, previous investigations have shown that laboratory tests cannot directly observe the interaction of thermal cracks and thermal stress, and more than 90<span>(%)</span> of AE tensile failure sources cannot be captured. This paper investigates the generation mechanism of thermal cracks and thermal stress distribution in thermally treated specimens using the discrete element method. After that, the evolution of AE failure sources is quantitatively analyzed by the moment tensor inversion results. The results showed that: (1) Thermal cracks destroy the internal structure of the specimen, thus weakening its mechanical properties. The number of thermal cracks increases with the temperature, further aggravating the damage to the mechanical properties of specimens; (2) as the temperature increases, the failure mode of the specimen changes from splitting failure to shear failure. Moment tensor inversion revealed that tensile failure dominated the final damage of samples. The shear and compaction failure sources increase with temperature, while tensile failure sources decrease; (3) the <i>b</i> value increased by 215<span>(%)</span> from 25 <span>(^{circ })</span>C to 1000 <span>(^{circ })</span>C. As the number of microcracks in a single AE event increases, the AE frequency decays exponentially, and most AE events have 1–5 microcracks.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1245 - 1266"},"PeriodicalIF":3.3,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4642033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Interaction of wet dam-break flows with a structure: on the effects of surface tension and gate opening velocity in water surface evolution using MPS method 湿溃坝水流与构筑物的相互作用:表面张力和开闸速度对水面演化的影响

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-02-14 DOI: 10.1007/s40571-023-00561-6

Joel Sanchez-Mondragon, Jassiel V. H. Fontes, Marco Polo Espinoza-Haro, Paulo T. T. Esperança

{"title":"Interaction of wet dam-break flows with a structure: on the effects of surface tension and gate opening velocity in water surface evolution using MPS method","authors":"Joel Sanchez-Mondragon, Jassiel V. H. Fontes, Marco Polo Espinoza-Haro, Paulo T. T. Esperança","doi":"10.1007/s40571-023-00561-6","DOIUrl":"10.1007/s40571-023-00561-6","url":null,"abstract":"<div><p>This paper presents an experimental and numerical investigation of the interaction of wet dam-break flows with a fixed structure. These flows presented breaking features and caused bow run-up and shipping water events on the deck of the structure. Wet dam-break experiments were performed using high-speed video to capture the stages of wave generation, interaction with the structure and propagation on its deck. Two different incoming flows were generated, varying the freeboard, and keeping the same wet dam-break ratio. These were numerically simulated using Moving Particle Semi-implicit (MPS) method. The purpose was to compare MPS numerical simulations based on two surface tension models previously proposed in the literature and a geometric-based surface tension model proposed in this work, this to improve free surface performance to represent breaking wave features more realistically. First, the different approaches were compared with experimental results. Then, the proposed model was implemented to analyze the effect of the velocity applied to gate opening on the water surface during wave generation, wave-bow interaction and water propagation over the deck. The distribution of particles, pressure and velocity fields was presented in this analysis. Results showed that the proposed surface tension model performed well in representing the free surface. It was seen that surface tension effects can be relevant during the wave formation effects. Furthermore, it was verified that variating the gate opening velocity, dynamic interactions of the resulting waves with the structure was affected, causing energetic processes variations. It is recommended to consider this velocity for validation purposes.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1221 - 1244"},"PeriodicalIF":3.3,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4571430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic stability model and analysis of mechanical properties for railway operations 铁路运行动力稳定性模型及力学性能分析

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-02-11 DOI: 10.1007/s40571-023-00560-7

Xiao Hong, Wang Xiaoyu, Zhang zhihai, Mahantesh M. Nadakatti, Jin Jiaqi, Chi Yihao

{"title":"Dynamic stability model and analysis of mechanical properties for railway operations","authors":"Xiao Hong, Wang Xiaoyu, Zhang zhihai, Mahantesh M. Nadakatti, Jin Jiaqi, Chi Yihao","doi":"10.1007/s40571-023-00560-7","DOIUrl":"10.1007/s40571-023-00560-7","url":null,"abstract":"<div><p>Dynamic track stabilizers have been widely used in the maintenance of ballast track, but limited studies have been carried out for the theoretical analysis of track stabilizing operations. In the present study, the structure of ballast track is innovatively established using bi-directional coupling modeling method which include discrete element method and multi-body dynamics method. The model is verified by field experimental data. Based on the tamping operation model, the mechanical properties of the ballast bed after tamping are obtained. Later simulation analysis of stabilizing operation is carried out to explore the change rule of sleeper displacement, particle contact, compaction, resistance and support stiffness of ballast bed. The results show that stabilizing operation can force the sleeper of the new railway line to move down quickly by 5.56 mm. The most significant improvement to the average coordination number between ballast was in the top layer of the crib area, which increased by 19.3%. The most significant area for improving the compactness of the ballast bed is the uppermost layer at the bottom of a sleeper, with an improvement rate of 6.4%. After stabilizing operation, the longitudinal and lateral resistances and supporting stiffness of the ballast track increased by 45.1%, 37.9% and 172.0%, respectively.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1205 - 1219"},"PeriodicalIF":3.3,"publicationDate":"2023-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4455319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

A unified and modular coupling of particle methods with fem for civil engineering problems 土木工程问题中粒子法与有限元的统一模块化耦合

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-02-06 DOI: 10.1007/s40571-023-00558-1

Carlos Eulogio Flores, Klaus Bernd Sautter, Philipp Bucher, Alejandro Cornejo, Alessandro Franci, Kai-Uwe Bletzinger, Roland Wüchner

{"title":"A unified and modular coupling of particle methods with fem for civil engineering problems","authors":"Carlos Eulogio Flores, Klaus Bernd Sautter, Philipp Bucher, Alejandro Cornejo, Alessandro Franci, Kai-Uwe Bletzinger, Roland Wüchner","doi":"10.1007/s40571-023-00558-1","DOIUrl":"10.1007/s40571-023-00558-1","url":null,"abstract":"<div><p>In this work, a modular coupling approach for particle methods with the FEM (finite element method) is presented. The proposed coupled strategy takes advantage from the ability of particle methods of dealing with large displacements and deformations, especially when solving complex fluid–structure and solid–structure interaction problems. The coupling between the FEM and particle methods is done using a co-simulation approach implemented in the open-source Kratos Multiphysics framework. The particle methods considered in this work are the DEM (discrete element method) and the PFEM (particle finite element method). The Lagrangian description of the PFEM is well suited for modeling fluids undergoing large deformations and free-surface motions, and the DEM can be used to simulate rocks, debris and other solid objects. To accelerate the convergence of the coupled strategy, a block Gauss–Seidel algorithm with Aitken relaxation is used. Several numerical examples, with an emphasis on natural hazards, are presented to test and validate the proposed coupled method.\u0000</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1181 - 1203"},"PeriodicalIF":3.3,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40571-023-00558-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4248687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Movement of C100 fullerene in a closed carbon nanocontainer C100富勒烯在封闭碳纳米容器中的运动

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-01-27 DOI: 10.1007/s40571-023-00552-7

Vladislav I. Borodin, Alexey M. Bubenchikov, Mikhail A. Bubenchikov, Anna S. Chelnokova, Dmitriy V. Mamontov

引用次数: 1

Simulation of dense gas-particle flow using a USM-θ model, combined with a frictional stress model 结合摩擦应力模型的USM-θ模型模拟致密气粒流

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-01-27 DOI: 10.1007/s40571-023-00554-5

Lixing Zhou, Yang Liu

引用次数: 0

Variation characteristics analysis of sandstone strength parameters in discrete element method by using internal scale ratio 采用内标度比的离散元法分析砂岩强度参数变化特征

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-01-20 DOI: 10.1007/s40571-022-00551-0

Yao Zhang, Shaoqiang Guo, Xiaotao Yin

{"title":"Variation characteristics analysis of sandstone strength parameters in discrete element method by using internal scale ratio","authors":"Yao Zhang, Shaoqiang Guo, Xiaotao Yin","doi":"10.1007/s40571-022-00551-0","DOIUrl":"10.1007/s40571-022-00551-0","url":null,"abstract":"<div><p>The mesostructural characteristics of sandstone determine its macro-engineering characteristics. To better understand the relationship between cohesion of sandstone particles and strength in the present study, the FISH programming language was used to design a particle flow test program and conduct uniaxial compression tests of geomaterials. Twelve numerical specimens with diameters of 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, and 2.0?mm were designed for uniaxial compression tests. A total of 41 tests were carried out to simulate three bond strengths between particles with no friction and 19 internal friction angles from 0° to 90° under weak and strong bonding conditions. According to the failure modes and stress–strain curves of the specimens, the influence of the inner scale ratio on the particle flow was analyzed. The following particular phenomena were observed: (1) With the increase in the bond strength between particles, it was more difficult for the particles to rupture, and the number of micro-cracks was drastically reduced. (2) When the bond strength remained constant, the failure modes before and after the internal friction angle of 45° were completely different, which was related to the shear failure angle. (3) The curve dropped significantly after the strong bonding peak, and the brittle failure characteristics were evident. (4) The changes in the strength parameters between particles did not change the energy transfer mode, and the change of the bond strength increased the proportion of the strain energy in the input energy. (5) In the case of weak bonding, the proportion of the strain energy in the input energy gradually decreased with the increase in the internal friction angle. When the bond was strong, the proportion of the strain energy was stable, with an insignificant decrease as the internal friction angle increased.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1145 - 1160"},"PeriodicalIF":3.3,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40571-022-00551-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4793094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Discrete meta-analysis of slit dam intercepted particle flow based on PFC3D 基于PFC3D的裂隙坝截流颗粒流离散元分析

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-01-19 DOI: 10.1007/s40571-022-00542-1

Yuqiong He, Lei Tang, Rong Sun

{"title":"Discrete meta-analysis of slit dam intercepted particle flow based on PFC3D","authors":"Yuqiong He, Lei Tang, Rong Sun","doi":"10.1007/s40571-022-00542-1","DOIUrl":"10.1007/s40571-022-00542-1","url":null,"abstract":"<div><p>Landslides are a common geological hazard, and large-scale landslides can often impose a serious impact on the livelihoods of contemporary people. To study the effect of slit dams on debris flow, numerical simulations were hereby calibrated with fine parameters through physical tests, and several different sets of slit dam stopping structures were designed to study their effect on the accumulation of debris flow movement. The results showed that: (1) slit dams work effectively in reducing the velocity of particles in the x-direction, blocking 81.24% of the debris flow volume; (2) the time for the velocity of particles in the x-direction to drop to 0?m/s increases and fluctuates more with the increase of the slit dam column spacing, when the retention rate of the slit dam gradually decreases, and a clear linear relationship is found between the column spacing and the volumetric retention rate in the range of 0.02–0.06?m; (3) as the number of column rows increases, that of particles overflowing decreases gradually, and that of column rows has less influence on the changing pattern of the velocity of particle movement in the x-direction, when the volume interception rate of debris flow increases, but the increasing rate of interception rate is decreasing gradually; and (4) the staggered arrangement of slit dams has a more pronounced effect on the velocity hindrance of particle movement in the x-direction, with a blockage rate of 1.59%, which is effectively improved.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1127 - 1143"},"PeriodicalIF":3.3,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4754151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Using a modified MPS gradient model to improve accuracy of SPH method for Poisson equations 利用改进的MPS梯度模型提高泊松方程SPH方法的精度

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-01-17 DOI: 10.1007/s40571-022-00549-8

Gholamreza Shobeyri

{"title":"Using a modified MPS gradient model to improve accuracy of SPH method for Poisson equations","authors":"Gholamreza Shobeyri","doi":"10.1007/s40571-022-00549-8","DOIUrl":"10.1007/s40571-022-00549-8","url":null,"abstract":"<div><p>In this study, a more accurate and efficient Laplacian model with the promising feature of kernel gradient-free is formulated. For this purpose, a hybrid approach in the context of the smoothed particle hydrodynamics (SPH) and moving particle semi-implicit (MPS) methods is used. A newly developed gradient model (Shobeyri in Iran J Sci Technol Trans Civil Eng, 2022. https://doi.org/10.1007/s40996-022-01013-6) which is derived by combining two MPS gradient models with the promising performance in free surface flows is applied in this paper (Chen et al. in Int J Numer Meth Fluids 80(6):358–374, 2016; Wang et al. in Int J Numer Meth Fluids 85(2):69–89, 2017). The proposed MPS gradient model is used in the standard Laplacian formulation (Shao and Lo in Adv Water Resour 26(7):787–800, 2003) to derive the improved Laplacian model. A comprehensive accuracy analysis for the solution of four 2-D Poisson equations subjected to both Dirichlet and Neumann boundary conditions on irregular calculation node distributions shows that this model can yield smaller errors compared with several SPH Laplacian models. Despite more complex formulations and additional terms, the proposed Laplacian model requires lower CPU usage times for solving the test problems which indicates noticeable computational efficiency. The introduced model can be effectively applied for simulation of different engineering applications such as fluid and solid mechanics problems.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1113 - 1126"},"PeriodicalIF":3.3,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4682097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

A coupled SPH–DEM model for erosion process of solid surface by abrasive water-jet impact 固体表面磨料水射流冲蚀过程的SPH-DEM耦合模型

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-01-14 DOI: 10.1007/s40571-023-00555-4

Ran Yu, Xiangwei Dong, Zengliang Li, Menghao Fan

{"title":"A coupled SPH–DEM model for erosion process of solid surface by abrasive water-jet impact","authors":"Ran Yu, Xiangwei Dong, Zengliang Li, Menghao Fan","doi":"10.1007/s40571-023-00555-4","DOIUrl":"10.1007/s40571-023-00555-4","url":null,"abstract":"<div><p>As a meshfree method, the smoothed particle hydrodynamics method (SPH) is suitable for fluid–particle–solid (FPS) interaction problems, such as abrasive water-jet (AWJ) impacting process. However, the fully resolved SPH model requires fine resolution of discrete particles and the computation is expensive. The coupled method of SPH and discrete element method (DEM) may be a more effective approach. A coupled SPH–DEM unresolved model is proposed in this study for AWJ simulation, which containing water-jet flow, metallic solid and abrasive particles. The fluid and solid phases are discretized with SPH particles, and the abrasives are described by the DEM method. The coupling between SPH and DEM is achieved based on the so-called local averaging techniques. To enforce the efficient interaction between SPH–DEM and SPH–SPH, a double-layer linked-list neighboring particle searching procedure is proposed for establishing particle-pair in each time step, resulting in diverse smoothing lengths in the domain. Four numerical cases are conducted to verify the model’s applicability including single/multiple particle sedimentation and continuous/discontinuous AWJ impact. The erosion process of plastic deformation, failure and material removal by AWJ impact is reproduced. The new coupled model has more computational efficiency. Results show that discontinuous AWJ has less erosion rate and more energy efficient than continuous AWJ. The effects of distance between adjacent water columns on crater profiles by discontinuous AWJ is also involved. This model has more efficiency to be suitable for the research of AWJ and complex fluid particle flow.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1093 - 1112"},"PeriodicalIF":3.3,"publicationDate":"2023-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4570270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4