Computational Particle Mechanics最新文献_第10页

Mechanical behavior analysis of enhanced railway sleepers for small radius curves 小半径曲线下加强型铁路轨枕力学性能分析

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2025-03-28 DOI: 10.1007/s40571-025-00947-8

Weize Zhao, Hong Xiao, Xiaotie Li, Zhongxia Qian, Shaolei Wei, Yihao Chi

{"title":"Mechanical behavior analysis of enhanced railway sleepers for small radius curves","authors":"Weize Zhao, Hong Xiao, Xiaotie Li, Zhongxia Qian, Shaolei Wei, Yihao Chi","doi":"10.1007/s40571-025-00947-8","DOIUrl":"10.1007/s40571-025-00947-8","url":null,"abstract":"<div><p>Subway depots commonly incorporate ultra-small radius curves, particularly in entry and exit lines, where conventional sleepers exhibit limitations in maintaining track geometry. This can lead to track expansion, misalignment, and derailments. An enhanced sleeper with a raised platform was specifically designed for small radius curves in this paper. A field implementation was conducted on a section of the subway entry and exit line with a radius of <i>R</i> = 150 m. Single tie push tests (STPTs) were performed to evaluate the lateral resistance of the enhanced sleeper, type IIIa sleeper, and existing wooden sleepers. Additionally, a discrete element model of the “sleeper-ballast bed” system was developed to analyze the mechanical properties of the sleepers under STPTs and vertical loading conditions. Results showed that the lateral resistance of the existing wooden sleepers was only 4.04 kN, whereas the type IIIa sleepers demonstrated a lateral resistance of 21.96 kN. In contrast, the enhanced sleepers demonstrated a lateral resistance of 25.35 kN, representing a 15.4% increase compared to the type IIIa sleeper. The raised platform of the enhanced sleeper contributed 37.2% of the total lateral resistance value. Under vertical loading, the maximum vertical force on the enhanced sleepers was reduced by 10.3%, and the ballast stress\u0000decreased by 8.1%. These findings indicate that the enhanced sleeper design not only improves track stability in ultra-small radius curves but also reduces maintenance needs and operational costs, offering a significant advancement in subway infrastructure.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 5","pages":"2745 - 2758"},"PeriodicalIF":2.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145405521","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 pair potential force model for surface tension calculations with smoothed particle hydrodynamics 光滑质点流体力学计算表面张力的一对势力模型

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2025-03-26 DOI: 10.1007/s40571-025-00948-7

Elias Santacruz-Yunga, Bernardo Guerrero-Rodríguez, Pablo Silva-Rojas, Richard Pérez-Roa, Leonardo Di G. Sigalotti, Claudia Trejo, Eric Plaza

{"title":"A pair potential force model for surface tension calculations with smoothed particle hydrodynamics","authors":"Elias Santacruz-Yunga, Bernardo Guerrero-Rodríguez, Pablo Silva-Rojas, Richard Pérez-Roa, Leonardo Di G. Sigalotti, Claudia Trejo, Eric Plaza","doi":"10.1007/s40571-025-00948-7","DOIUrl":"10.1007/s40571-025-00948-7","url":null,"abstract":"<div><p>Smoothed particle hydrodynamics (SPH) is a grid-free numerical method that relies on a Lagrangian description of the fluid. It has been used in a variety of multiphysics applications, including applications to free surface flow problems where surface tension plays a pivotal role. Accurate simulations of surface tension are crucial for a realistic description of multiphase flows and small-scale fluid systems, such as drops and bubbles. This article describes a novel approach based on a pair potential force within the SPH framework that simulates surface tension in a physically consistent manner. The Young–Laplace equation is used to calibrate the force term associated with the cohesive action so that there is a close correspondence between the calculated surface tension and the minimization of the surface area. The performance of the model has been assessed against a number of benchmark tests, including the spherization of cubic drops, the spreading of a drop impacting on a solid surface, and the drop oscillation in a gas environment. A comparison of experimentally obtained pendant drop images with the simulation results for distilled water, ethylene glycol and ethanol drops is also provided as a further validation test. The proposed approach has been shown to be accurate enough to simulate surface tension effects in liquid drops under a variety of dynamical conditions <b>irrespective</b> of the length scale, implying that it is particularly suitable for simulating microfluidic systems.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 5","pages":"2729 - 2744"},"PeriodicalIF":2.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145405842","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

Mechanical and damage properties study of rocks with different joint inclinations under seepage–stress coupling: insights based on energy theory 渗流-应力耦合作用下不同节理倾角岩石力学与损伤特性研究：基于能量理论的见解

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2025-03-25 DOI: 10.1007/s40571-025-00942-z

Gang Ma, Manchao He, Jie Hu, Honggang Wu, Wentao Wang, Mingming Ren

{"title":"Mechanical and damage properties study of rocks with different joint inclinations under seepage–stress coupling: insights based on energy theory","authors":"Gang Ma, Manchao He, Jie Hu, Honggang Wu, Wentao Wang, Mingming Ren","doi":"10.1007/s40571-025-00942-z","DOIUrl":"10.1007/s40571-025-00942-z","url":null,"abstract":"<div><p>To investigate the mechanical and damage properties of rock specimens with different joint inclinations under seepage–stress coupling, a comparative numerical simulation test for different working conditions was developed using RFPA<sup>2D</sup>-Flow code. The distinction between their mechanical properties was compared and analyzed. The damage properties of rocks with different joint inclinations under seepage–stress coupling were also investigated based on energy theory and regression analysis. A new pre-peak damage constitutive model was established. The results indicated that the peak strength declined and then enhanced with growing joint inclination, and the equivalent elastic modulus increased with growth of joint inclination, but they were both lower than intact rocks. As the joint inclination increases, the peak strain changes in a “W” shape. Based on the energy theory, the peak energy characteristics of rocks with different joint inclinations under seepage–stress coupling were investigated. The linear relationship between <i>U</i> and<i> U</i><sup>e</sup> and <i>U</i><sup>d</sup> before peak stress was obtained employing the regression method, which conforms to the linear energy storage law. Then, a damage constitutive model based on the linear energy storage law for jointed rocks under seepage–stress coupling condition was established, and the initial damage was considered. The stress–strain curves calculated according to the model are more consistent with the experimentally measured curves in the pre-peak stage, which verifies the validity of the model.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 5","pages":"2713 - 2728"},"PeriodicalIF":2.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145406099","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

Mechanical properties and damage evolution mechanisms of filled cracked red sandstone 充填裂隙红砂岩力学特性及损伤演化机制

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2025-03-25 DOI: 10.1007/s40571-025-00939-8

Dongmei Huang, Huanhuan Lu, Xin Lu, Baoguo Cui, Xikun Chang, Xiaofeng Hou, Ran Sun

{"title":"Mechanical properties and damage evolution mechanisms of filled cracked red sandstone","authors":"Dongmei Huang, Huanhuan Lu, Xin Lu, Baoguo Cui, Xikun Chang, Xiaofeng Hou, Ran Sun","doi":"10.1007/s40571-025-00939-8","DOIUrl":"10.1007/s40571-025-00939-8","url":null,"abstract":"<div><p>Grouting reinforcement technology is a method to reinforce fractured rock mass in rock engineering. Fillers will change the stress of the fracture, thus affecting the mechanical behavior and cracking behavior of the fractured rock mass. In this paper, uniaxial compression tests were conducted on red sandstone samples containing varying numbers of fractures, and the impact of fillers on the strength characteristics and damage progression in fractured red sandstone was investigated. A numerical simulation of the uniaxial loading process was conducted, examining the influence of fracture and filler presence on mesofailure mechanisms, focusing on mechanical properties, particle displacement and failure modes. The findings indicate that the filled specimens exhibit higher uniaxial compressive strength and elastic modulus compared to the unfilled ones. During the loading process, a phenomenon of stress concentration arises at the interfaces and tips of fractures, which subsequently triggers the formation of numerous microcracks. The emergence of fractures within the specimen leads to a substantial decrease in its crack initiation coefficient. When fractures are filled, the crack initiation coefficient significantly improves, requiring higher stress for failure. The damage evolution can be categorized into four stages: undamaged, initial damage, damage progression and ultimate failure.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 5","pages":"2695 - 2711"},"PeriodicalIF":2.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145406100","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 soft EHL model using a particle method 用粒子法建立软EHL模型

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2025-03-25 DOI: 10.1007/s40571-025-00913-4

Daisuke Yamada, Tetsuro Ninomiya, Shu Hiramoto, Kyuya Matsumoto, Kazuya Shibata, Hideyo Negishi, Kazuaki Maniwa, Shingo Obara

引用次数: 0

Numerical study on shear behavior of backfill-rock rough interface considering 3D morphology of surrounding rock in a mining stope 考虑采场围岩三维形貌的回填-岩石粗糙界面剪切特性数值研究

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2025-03-22 DOI: 10.1007/s40571-025-00935-y

Wenkai Ru, Diyuan Li, Hao Gong, Zhenyu Han, Chenxi Zhang

{"title":"Numerical study on shear behavior of backfill-rock rough interface considering 3D morphology of surrounding rock in a mining stope","authors":"Wenkai Ru, Diyuan Li, Hao Gong, Zhenyu Han, Chenxi Zhang","doi":"10.1007/s40571-025-00935-y","DOIUrl":"10.1007/s40571-025-00935-y","url":null,"abstract":"<div><p>This study introduces a rough interface construction method that considers the morphology of surrounding rock in mining stopes, applied to backfill-rock samples and numerical models. Using a smooth-joint model in the PFC3D numerical software, accurate contact conditions were achieved at the backfill-rock interface. This approach overcomes the limitations of simplified geometries in capturing the influence of rock morphology on shear behavior. Comparative analysis between experimental and simulation results showed that increasing cement content and normal stress enhances the shear strength of backfill-rock samples. Increased normal stress promoted microcrack propagation in concave regions of rough surfaces, strengthening failure resistance by improving backfill sliding resistance. Conversely, decreased cement content led to rapid microcrack development along mold edges, suggesting that lower cement content reduces shear resistance and influences failure characteristics. The PFC3D simulations successfully replicated stress responses and failure patterns observed in experiments, providing a robust framework for investigating the mechanical behavior and failure mechanisms of backfill-rock interactions. These insights provide a valuable basis for optimizing backfill-rock stability and improving underground mining safety and efficiency.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"2555 - 2574"},"PeriodicalIF":2.8,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880764","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

The influence of material crushing on screening rate during the screening process based on the DEM-BPM model 基于DEM-BPM模型的筛分过程中物料破碎对筛分率的影响

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2025-03-21 DOI: 10.1007/s40571-025-00946-9

GuoLang Shen, ZuQuan Xu, Feng Dong, XingGuo Wang, Gong Chen, GangTao Zhang

{"title":"The influence of material crushing on screening rate during the screening process based on the DEM-BPM model","authors":"GuoLang Shen, ZuQuan Xu, Feng Dong, XingGuo Wang, Gong Chen, GangTao Zhang","doi":"10.1007/s40571-025-00946-9","DOIUrl":"10.1007/s40571-025-00946-9","url":null,"abstract":"<div><p>Screening experiments on friable materials have shown that significant crushing occurs in the rotary vibrating screen; however, many studies have not fully accounted for its impact on screening efficiency. This study investigates kaolin as a research subject to elucidate how material crushing influences screening efficiency. First, the bonded particle model within the discrete element method was employed to generate kaolin particle clusters, simulating their crushing behavior during the sieving process. The vibration frequency and amplitude were optimized through simulation experiments, revealing that a frequency of 13 Hz and an amplitude of 3 mm achieved the optimal balance between screening efficiency and material breakage. Comparative experiments demonstrated that incorporating ultrasonic vibration markedly enhanced screening efficiency. Vibration intensity was further analyzed to validate the accuracy of the selected parameter combination. Finally, physical experiments confirmed the accuracy of the simulation results, demonstrating that moderate crushing positively contributes to overall screening efficiency. This study elucidates the crushing mechanism of friable materials in rotary vibrating screens, providing a scientific basis for optimizing high-efficiency screening processes.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 5","pages":"2681 - 2693"},"PeriodicalIF":2.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145406078","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

Quantifying deviation of elasticity in the quasi-elastic domain of granular soils 颗粒土准弹性域弹性偏差量化研究

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2025-03-21 DOI: 10.1007/s40571-025-00944-x

Wen Deng, Yufan Jin, Pingxin Xia, Qingqing Fu, Xiong Xia, Xiaoxia Guo

{"title":"Quantifying deviation of elasticity in the quasi-elastic domain of granular soils","authors":"Wen Deng, Yufan Jin, Pingxin Xia, Qingqing Fu, Xiong Xia, Xiaoxia Guo","doi":"10.1007/s40571-025-00944-x","DOIUrl":"10.1007/s40571-025-00944-x","url":null,"abstract":"<div><p>The absence of purely elastic properties in granular soil is attributed to the reversible sliding that occurs between particles during the loading–unloading cycle, leading to the dissipation of energy through friction. Instead of the strictly elastic domain, we opt for a quasi-elastic domain to examine elastic behavior within the confines of elastic theory. Within this quasi-elastic realm, the response deviates to some extent from the idealized pure elastic behavior posited by the elastic theory. As a result, the elastic constitutive relations applied to granular materials are no longer strictly accurate and may exhibit deviations. With the aim of exploring the deviation of the elasticity of granular materials from idealized pure elasticity, this paper proposes a quantitative approach to assess deviation of elasticity. Specific metrics are formulated to gauge the proximity to pure elasticity. Cyclic triaxial numerical simulation tests, utilizing the discrete element method and accounting for both spherical and non-spherical particles, are conducted to examine the progression of sliding friction energy dissipation and sliding contacts under shear stress within the quasi-elastic domain. The findings indicate that, both at the micro and macroscales, the evolution of quasi-elasticity can be consistently quantified. The threshold for intrinsic slip rate or energy dissipation rate, which corresponds to the termination of initial elasticity, can serve as a quantifiable measure for determining the effective applicability of elastic theory in soil mechanics.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 5","pages":"2669 - 2680"},"PeriodicalIF":2.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145406079","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 analysis of liquid ring vacuum pump by the MPS method considering gas chamber effects and inflow/outflow of liquid and gas 考虑气室效应和液气流入/流出的MPS方法对液环真空泵进行数值分析

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2025-03-20 DOI: 10.1007/s40571-025-00932-1

Taro Kaito, Kazuya Shibata, Takeshi Takanashi, Naoyuki Yasuda

引用次数: 0

Impacts of baffle setting in rotary kiln on pyrolysis movement of pesticide waste salt particles 回转窑挡板设置对农药废盐颗粒热解运动的影响

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2025-03-18 DOI: 10.1007/s40571-025-00940-1

Yueyan Song, Wenjun Shang, Miao Shang, Zhaomin Wang, Di He

{"title":"Impacts of baffle setting in rotary kiln on pyrolysis movement of pesticide waste salt particles","authors":"Yueyan Song, Wenjun Shang, Miao Shang, Zhaomin Wang, Di He","doi":"10.1007/s40571-025-00940-1","DOIUrl":"10.1007/s40571-025-00940-1","url":null,"abstract":"<div><p>The rotary kiln has been widely used in the chemical pyrolysis industry for decades. This study focused on elucidating the impact of incorporating baffles on the motion of pesticide waste salt (WS) particles during pyrolysis in a rotary kiln. Through discrete element method software simulation, the effects of different baffle lengths (75 cm, 120 cm, and 150 cm) and baffle angles (0°, 15°, and 45°) were investigated to provide valuable insights into predicting the movement and heat transfer of WS. The simulation results indicated that the length of the baffle had a significant impact on the behavior of WS particles with longer baffles resulting in enhanced mean residence time and velocity of particles but the reduced temperature variations. These changes were accompanied by a cyclic pattern of initially rising and subsequently falling velocities. Conversely, the baffle setting angle exhibits an insignificant impact in most cases. Notably, the inclusion of baffles enhanced the elastic forces generated by particle collisions, as well as friction from rolling and relative sliding, which led to enhanced particle dispersion and rotation of WS particles. The findings confirmed that incorporating baffles positively affected both particle movement and heat transfer, thereby relieving the burden associated with subsequent management and disposal processes.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 5","pages":"2655 - 2668"},"PeriodicalIF":2.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145405700","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