Computational Particle Mechanics最新文献_第10页

Numerical analysis and application of stress corrosion model considering strain softening 考虑应变软化的应力腐蚀模型的数值分析和应用

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-06-03 DOI: 10.1007/s40571-024-00775-2

Xuejun Wang, Hanxiong Yang, Xiangbo Xiong

{"title":"Numerical analysis and application of stress corrosion model considering strain softening","authors":"Xuejun Wang, Hanxiong Yang, Xiangbo Xiong","doi":"10.1007/s40571-024-00775-2","DOIUrl":"10.1007/s40571-024-00775-2","url":null,"abstract":"<div><p>The deformation behavior of rock over time dominated by stress corrosion has been an important research topic for a long time. Based on the principle of stress corrosion damage rate and the concept of rock strain softening, a stress corrosion (SSC) model considering rock strain softening was proposed. The model describes the diameter degradation of inter-particle bond and bond fracture caused by stress corrosion in 2D and 3D scales, respectively. The adhesive particles with softening characteristics are used to compose rock samples, and the time-dependent failure analysis of rock aging characteristics is carried out by using adaptive time step. The results show that the SSC model can match the static fatigue test results of Lac du Bonnet granite and the ideal creep behavior curve. At the same time, the long-term stress corrosion failure time of granite is predicted and compared with the existing stress corrosion models and the stress corrosion failure time prediction data, the SSC model can better predict the long-term stress corrosion failure time of granite. In addition, flexible triaxial compression experiments coupled with FDM-DEM (finite difference method and discrete element) were carried out to verify the relationship between the reduction of soft bond diameter and the driving stress ratio of the SSC model. Finally, the SSC model is used to perform uniaxial compression experiments on rock masses with precast cracks, which provides reference for engineering cases from the mesoscale.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 5","pages":"2215 - 2233"},"PeriodicalIF":2.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141269842","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

A meshless particle method for solving time-fractional wave equations 求解时间分数波方程的无网格粒子法

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-05-30 DOI: 10.1007/s40571-024-00771-6

Zehui Ma, Rahmatjan Imin

引用次数: 0

Research on the mechanism of railway ballast shear performance under various sand contents and load conditions 不同含沙量和荷载条件下铁路道碴剪切性能的机理研究

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-05-30 DOI: 10.1007/s40571-024-00776-1

Yihao Chi, Hong Xiao, Xuhao Cui, Zhipei Chen, Zhihai Zhang, Zhongxia Qian, Weize Zhao

{"title":"Research on the mechanism of railway ballast shear performance under various sand contents and load conditions","authors":"Yihao Chi, Hong Xiao, Xuhao Cui, Zhipei Chen, Zhihai Zhang, Zhongxia Qian, Weize Zhao","doi":"10.1007/s40571-024-00776-1","DOIUrl":"10.1007/s40571-024-00776-1","url":null,"abstract":"<div><p>Railway operation in desert areas faces unique challenges due to wind-blown sand penetration on the safety of the line. In-depth research on the impact of wind-blown sand penetration on the shear performance of the railway ballast is crucial for understanding potential problems in sandy railways and formulating effective maintenance strategies. This paper conducts a series of direct shear tests under various sand contents and load conditions using an independently developed automatic control loading direct shear test apparatus suitable for railway ballast. By accurately considering the interaction between sand and ballast particles, some direct shear numerical models of different sand-containing ballast boxes based on refined particle simulation are established based on the discrete element method (DEM) and particle scaling method, exploring the variation in shear strength, shear deformation, contact relationships, and rotational characteristics of railway sand-containing ballast from macroscopic and microscopic perspectives. The results show that with the increase in shear strain, the shear stress of the ballast with various sand contents increases first and then tends to stabilize, and the phenomenon of dilation occurs in all cases. When the normal load is constant, the shear strength and cohesion of the ballast show a trend of first decreasing and then increasing with the increase in sand content. The wind-blown sand penetration inhibits the rotational deformation during shearing, enhancing particle aggregation. With the increase in sand content, the contact coordination number, powerful force chain number, and total force chain number all increase continuously. However, the average contact force shows a trend of gradually decreasing and then increasing. This study provides theoretical support and experimental backing for the operation and maintenance of the ballast bed in sandy railways.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 6","pages":"2995 - 3012"},"PeriodicalIF":2.8,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141187915","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

Numerical investigation of mixing and heat transfer of granular material in a ribbon reactor: effect of impeller speed and filling rate 带式反应器中颗粒材料的混合和传热数值研究：叶轮速度和填充率的影响

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-05-30 DOI: 10.1007/s40571-024-00778-z

Zhijian Zuo, Bingwen Feng, Qiliang Liu, Shuguang Gong, Haishan Lu, Jianping Zhang

{"title":"Numerical investigation of mixing and heat transfer of granular material in a ribbon reactor: effect of impeller speed and filling rate","authors":"Zhijian Zuo, Bingwen Feng, Qiliang Liu, Shuguang Gong, Haishan Lu, Jianping Zhang","doi":"10.1007/s40571-024-00778-z","DOIUrl":"10.1007/s40571-024-00778-z","url":null,"abstract":"<div><p>A better understanding of the relevance between mixing and heat transfer of granular material is necessary for the design of mixers in various industries. In this work, the effect of impeller speed and filling rate on the mixing and heat transfer of granular material in a ribbon reactor was studied based on DEM simulations. Quantitative criteria which are characterized by the critical mixing time and critical heating time were proposed based on the simulation results. It was found that the area near the vessel wall is heated first, and then the top surface area and the region near the impeller shaft are heated sequentially due to the recirculation effect. Increasing the impeller speed and decreasing the filling rate can improve the mixing and heat transfer performance. The effects of impeller speed and filling rate on mixing and heat transfer weaken as they increase. Results obtained in this work indicate that increasing the mixing performance can enhance the heat transfer of granular material in the ribbon reactor.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"41 - 58"},"PeriodicalIF":2.8,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141187911","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

A DEM-based framework to optimize the gradation of concrete aggregate using fractal approach 利用分形方法优化混凝土骨料级配的基于 DEM 的框架

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-05-29 DOI: 10.1007/s40571-024-00774-3

Gang Ma, Fan Wang

{"title":"A DEM-based framework to optimize the gradation of concrete aggregate using fractal approach","authors":"Gang Ma, Fan Wang","doi":"10.1007/s40571-024-00774-3","DOIUrl":"10.1007/s40571-024-00774-3","url":null,"abstract":"<div><p>Several gradations of concrete with fractal dimension <i>D</i> = 2.0–2.9 (i.e., 2.0, 2.2, 2.4 2.6, 2.7, 2.8, 2.9) were designed based on particle size-mass distribution fractal model. The random polyhedral aggregate model was generated and then imported particle flow code, the discrete element method (DEM), to establish a multi-phase model considering mortar, aggregate, and interfacial transition zone (ITZ). On this basis, the relationship between fractal dimension <i>D</i> and macro-mechanical properties and microstructure of concrete was discussed, and the grading evaluation index was proposed based on fractal dimension <i>D</i>. The results show that the number of large-size aggregates decreases with increase in the fractal dimension, the compressive strength of concrete increases and reaches the maximum when the fractal dimension <i>D</i> = 2.7. Meanwhile, the fractal dimension affects the failure mode, as fractal dimension <i>D</i> increases, the total microcracks gradually increase, among which the ITZ microcracks increase mainly. Compared with the uncertainty of the non-uniformity coefficient and curvature coefficient, the fractal dimension can more accurately describe the aggregate grading characteristics. In addition, appropriate adjustments should be made to determine the range of fractal dimensions considering the differences between the aggregate filling.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 5","pages":"2203 - 2214"},"PeriodicalIF":2.8,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141167691","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

Discrete element model for effective electrical conductivity of spark plasma sintered porous materials 火花等离子烧结多孔材料有效电导率的离散元模型

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-05-28 DOI: 10.1007/s40571-024-00773-4

F. Nisar, J. Rojek, S. Nosewicz, J. Szczepański, K. Kaszyca, M. Chmielewski

{"title":"Discrete element model for effective electrical conductivity of spark plasma sintered porous materials","authors":"F. Nisar, J. Rojek, S. Nosewicz, J. Szczepański, K. Kaszyca, M. Chmielewski","doi":"10.1007/s40571-024-00773-4","DOIUrl":"10.1007/s40571-024-00773-4","url":null,"abstract":"<div><p>This paper aims to analyse electrical conduction in partially sintered porous materials using an original resistor network model within discrete element framework. The model is based on sintering geometry, where two particles are connected via neck. Particle-to-particle conductance depends on neck size in sintered materials. Therefore, accurate evaluation of neck size is essential to determine conductance. The neck size was determined using volume preservation criterion. Additionally, grain boundary correction factor was introduced to compensate for any non-physical overlaps between particles, particularly at higher densification. Furthermore, grain boundary resistance was added to account for the porosity within necks. For numerical analysis, the DEM sample was generated using real particle size distribution, ensuring a heterogeneous and realistic microstructure characterized by a maximum-to-minimum particle diameter ratio of 15. The DEM sample was subjected to hot press simulation to obtain geometries with different porosity levels. These representative geometries were used to simulate current flow and determine effective electrical conductivity as a function of porosity. The discrete element model (DEM) was validated using experimentally measured electrical conductivities of porous NiAl samples manufactured using spark plasma sintering (SPS). The numerical results were in close agreement with the experimental results, hence proving the accuracy of the model. The model can be used for microscopic analysis and can also be coupled with sintering models to evaluate effective properties during the sintering process.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 5","pages":"2191 - 2201"},"PeriodicalIF":2.8,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40571-024-00773-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141167692","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 element modeling of effect of interfacial roughness and pre-crack on crack propagation in thermal barrier coatings 界面粗糙度和预裂纹对隔热涂层裂纹扩展影响的离散元建模

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-05-25 DOI: 10.1007/s40571-024-00777-0

Yafeng Li, Hongfei Gao, Lei Wang, Yulin Sun, Jing Zhang

引用次数: 0

Approximate expressions for the capillary force and the surface area of a liquid bridge between identical spheres 相同球体间液体桥的毛细管力和表面积的近似表达式

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-05-24 DOI: 10.1007/s40571-024-00772-5

Meysam Bagheri, Sudeshna Roy, Thorsten Pöschel

引用次数: 0

Experimental and numerical investigation on crack propagation for a zigzag central cracked Brazilian disk 人字形中心开裂巴西圆盘裂纹扩展的实验和数值研究

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-05-23 DOI: 10.1007/s40571-024-00762-7

Vahab Sarfarazi, Jinwei Fu, Hadi Haeri, Mina Tahmasebi Moez, Manoj Khandelwal

{"title":"Experimental and numerical investigation on crack propagation for a zigzag central cracked Brazilian disk","authors":"Vahab Sarfarazi, Jinwei Fu, Hadi Haeri, Mina Tahmasebi Moez, Manoj Khandelwal","doi":"10.1007/s40571-024-00762-7","DOIUrl":"10.1007/s40571-024-00762-7","url":null,"abstract":"<div><p>This study examines the influence of zigzag joint configuration on crack propagation in centrally cracked Brazilian disks subjected to diametric forces, employing a 2-dimensional Particle Flow Code (PFC2D). An 80-mm-diameter disk specimen was used, featuring a single zigzag joint positioned at its center. The angles between the zigzag joint walls varied (45°, 90°, 135°), and the angle between loading and joint direction ranged from 0° to 90°. Testing was conducted under Brazilian indirect tensile (Splitting tensile test) conditions, with Acoustic Emission (AE) data utilized to analyze fracture progression. The movements of the boundary rate were kept at 0.005 mm/s. Brazilian tensile strength and uniaxial compression strength of samples were 0.8MPa and 7.4 MPa, respectively. The failure strengths were found to be contingent on the specific failure mechanism, which, in turn, was influenced by the geometric attributes of the flaws considered. The maximum failure force correlated with the number of tensile cracks, which increased as the zigzag notch angle decreased. Initial loading exhibited few AE events, but subsequently, AE hits escalated prior to reaching peak force, with the number of hits increasing as the zigzag notch angle decreased. The failure pattern and maximum force observed in specimens closely mirrored results obtained through both numerical simulations and experimental methods.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 6","pages":"2909 - 2922"},"PeriodicalIF":2.8,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141153194","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

Large deformation assessment of the bearing capacity factor for rigid footing: effect of soil heterogeneity 刚性基脚承载力系数的大变形评估：土壤异质性的影响

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-05-23 DOI: 10.1007/s40571-024-00763-6

Wei-Hai Yuan, Hao-Cheng Wang, Ya-Jun Li, Wei Zhang, Kang Liu

{"title":"Large deformation assessment of the bearing capacity factor for rigid footing: effect of soil heterogeneity","authors":"Wei-Hai Yuan, Hao-Cheng Wang, Ya-Jun Li, Wei Zhang, Kang Liu","doi":"10.1007/s40571-024-00763-6","DOIUrl":"10.1007/s40571-024-00763-6","url":null,"abstract":"<div><p>In this paper, the influence of soil spatial variability on the large deformation bearing capacity of rigid footing is presented. The random generalized interpolation material point (RGIMP) method, in which the large deformation GIMP method is combined with random field theory in a Monte Carlo simulation framework, was developed. The continuous penetration of a rigid footing in a spatially variable Tresca soil is modeled using the RGIMP approach. The results show that the average value of the bearing capacity factor of the spatially variable soil is often smaller than that of the homogeneous soil because the failure of the soil always occurs along the weak path. The average value of the bearing capacity factor decreases with increasing coefficient of variation (COV) and increases with increasing horizontal scale of fluctuation (SOF). Compared with the value of the horizontal SOF, the COV has a greater influence on the bearing capacity factor. The findings of this study are helpful for obtaining a better understanding of the bearing capacity of heterogeneous foundations.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 6","pages":"2923 - 2941"},"PeriodicalIF":2.8,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141107236","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