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3D hydro-mechanical coupling analysis of dynamic characteristics in saturated roadbed of ballastless high-speed railway 无砟高速铁路饱和路基动态特性的三维水力机械耦合分析
IF 1.4 4区 工程技术 Q2 Engineering Pub Date : 2023-12-01 DOI: 10.1615/intjmultcompeng.2023049905
Kaiwen Liu, Yanfei Pei, Pengfei Zhou, Bao Liu, Yang Chen, Tengfei Wang
Recent field case study shows that the roadbed of ballastless high-speed railway experienced the water induced disease such as excessive fines pumping and even local subgrade-track contact loss affecting the normal operation of high-speed train due to water immersion through gaps of waterproof materials in expansion joints between the concrete base particularly in rainy seasons. However, the study about the dynamic behavior of high-speed railway subgrade involving water is currently rare. Based on the theory of fluid dynamics in porous medium and the vehicle-track-subgrade coupling vibration theory, a 3D hydro-mechanical finite element model was established to evaluate the dynamic responses of saturated roadbed surface layer under the high-speed train loading with the validation by comparing the calculated values and field data. The temporal and spatial characteristics of dynamic behaviors (stress, pore water pressure, seepage velocity, displacement) of saturated roadbed surface layer are fully discussed. Also, the effects of train velocity, permeability, on aforementioned dynamic responses of the saturated roadbed surface layer are evaluated. The study shows that improving the drainage of ballastless track roadbed has a significant effect on minimizing the ballastless track mud pumping, and the influence zone of hydraulic-mechanical coupling is mainly within 0.1 m of the roadbed.
最近的实地案例研究表明,无砟高速铁路的路基在雨季尤其会因混凝土路基之间伸缩缝中防水材料的间隙浸水而出现细砂泵送量过大等水诱发病害,甚至出现局部路基-轨道接触损失,影响高速列车的正常运行。然而,目前有关高速铁路路基涉水动态行为的研究还很少。基于多孔介质流体力学理论和车辆-轨道-路基耦合振动理论,建立了三维水力机械有限元模型,评估了饱和路基面层在高速列车荷载作用下的动力响应,并通过比较计算值和现场数据进行了验证。充分讨论了饱和路基表层动态行为(应力、孔隙水压力、渗流速度、位移)的时空特征。此外,还评估了列车速度、渗透率对上述饱和路基表层动态响应的影响。研究表明,改善无砟轨道道床的排水性能对最大限度地减少无砟轨道泥浆泵送具有显著效果,水力机械耦合的影响区域主要在道床 0.1 米范围内。
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引用次数: 0
Corrosion Prediction of Mg Implant using Multiscale Modelling based on Machine Learning Algorithms 利用基于机器学习算法的多尺度建模预测镁植入物的腐蚀情况
IF 1.4 4区 工程技术 Q2 Engineering Pub Date : 2023-12-01 DOI: 10.1615/intjmultcompeng.2023050288
Santu Mondal, Rahul Samanta, Sahadeb Shit, Arindam Biswas, Atul Bandyopadhyay, Rudra Sankar Dhar, Gurudas Mandal
To improve patient outcomes and reduce the social and financial burdens associated with implant failure, ongoing research and development are essential. For that in this study, MLA has been done to predict the corrosion behavior of Mg implant. This includes advancements in implant materials, surgical techniques, infection prevention strategies, and personalized medicine approaches that consider each patient's unique characteristics. Ultimately, the goal is to make orthopedic surgery safer and more effective. The primary focus is to minimize complications like implant failure due to corrosion to enhance the overall quality of life for patients. Infections around orthopedic implants are a major cause of implant failure. These infections can be challenging to treat because the implant’s presence can make it difficult for the body’s immune system to effectively combat the infection. Preventing infection is crucial and often involves strict sterile procedures during surgery. Antibiotics may also be prescribed prophylactically. Inflammation is a natural response to surgery, but excessive inflammation can cause pain and lead to complications, including implant failure. Advanced materials and improved surgical techniques are designed to reduce the likelihood of aseptic loosening. When an implant fails, revision surgery becomes necessary. Implant materials are chosen to minimize corrosion, but it can still occur. Corrosion can lead to wear and damage to the implant, potentially causing inflammation and implant failure. Surgeons and manufacturers continually seek materials with improved resistance to corrosion.
为了改善患者的治疗效果,减少与种植失败相关的社会和经济负担,持续的研究和开发至关重要。为此,在本研究中,已对镁植入物的腐蚀行为进行了预测。这包括植入材料、手术技术、感染预防策略以及考虑到每位患者独特特征的个性化医疗方法等方面的进步。最终,我们的目标是使骨科手术更安全、更有效。首要重点是尽量减少因腐蚀导致的植入失败等并发症,以提高患者的整体生活质量。骨科植入物周围的感染是植入物失效的主要原因。这些感染的治疗具有挑战性,因为植入物的存在会使人体免疫系统难以有效对抗感染。预防感染至关重要,通常需要在手术过程中进行严格的无菌操作。也可以预防性地使用抗生素。炎症是手术后的自然反应,但过度炎症会引起疼痛并导致并发症,包括植入失败。先进的材料和改良的手术技术可以降低无菌性松动的可能性。当种植体失效时,就必须进行翻修手术。种植体材料的选择是为了尽量减少腐蚀,但腐蚀仍然可能发生。腐蚀会导致种植体磨损和损坏,有可能引起炎症和种植体失效。外科医生和生产商不断寻求耐腐蚀性更好的材料。
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引用次数: 0
Detailed design and analysis for additive manufacturing of topologically optimised and generatively designed Ti-6Al-4V Hip Joint Implant 拓扑优化生成设计的Ti-6Al-4V髋关节植入物增材制造详细设计与分析
IF 1.4 4区 工程技术 Q2 Engineering Pub Date : 2023-12-01 DOI: 10.1615/intjmultcompeng.2023050152
Abhishek Kishor, Ramesh Gupta Burela, Ankit Gupta
In this paper, a comprehensive investigation for the design and analysis of Ti-6Al-4V hip joint implants using generative design and topology optimisation, along with Laser Powder Bed Fusion (LPBF) additive manufacturing, has been presented. The study employed the NSGA-II genetic algorithm for generative design, enabling the generation of diverse optimised designs and topology optimisation with the SIMP approach, efficiently reducing implant mass of the design space by up to 75% while maintaining structural integrity. Finite Element Analysis revealed comparable levels of von Misses stress and deformation between geometries obtained with generative design and topology optimisation. However, the combined approach exhibited superior performance, namely topology optimisation followed by generative design, with a 40% reduction in deformation and a 15% reduction in von Misses stress compared to conventional models. LPBF simulations demonstrated the superiority of the optimised geometries, with a 30% reduction in thermal stress and a 66% reduction in deformation compared to conventional designs. It is observed that design input for generative design has a significant impact on the output design. Also, geometry has a notable impact on the quality of the printed part.
本文采用生成式设计和拓扑优化,以及激光粉末床融合(LPBF)增材制造技术,对Ti-6Al-4V髋关节植入物的设计和分析进行了全面研究。该研究采用NSGA-II遗传算法进行生成式设计,能够使用SIMP方法生成各种优化设计和拓扑优化,在保持结构完整性的同时有效地将设计空间的种植体质量减少高达75%。有限元分析揭示了与生成设计和拓扑优化获得的几何形状之间的von mises应力和变形的可比水平。然而,与传统模型相比,组合方法表现出优异的性能,即拓扑优化之后的生成设计,变形减少40%,von mises应力减少15%。LPBF模拟证明了优化几何形状的优越性,与传统设计相比,热应力降低了30%,变形减少了66%。可以观察到,生成设计的设计输入对输出设计有显著的影响。此外,几何形状对打印件的质量也有显著影响。
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引用次数: 0
Further development of GDEM for the modelling of multi-scale dynamic response of rock subjected to blasting and impact 进一步开发 GDEM,用于模拟岩石在爆破和冲击作用下的多尺度动态响应
IF 1.4 4区 工程技术 Q2 Engineering Pub Date : 2023-12-01 DOI: 10.1615/intjmultcompeng.2023049685
Jianjun Ma, Rui Li, Chenghao Li, Junjie Chen, Yuexiang Lin, Linchong Huang
The dynamical responses of rock subjected to blasting and impact have been concerned in most underground projects. Due to the size effects and strain rate enhancement induced by inertial effects, the dynamic responses of rock and underground structures show multi-scale characteristics. Thus, in order to achieve better understanding of multi-scale dynamic responses of rocks, both computation accuracy and numerical efficiency have been taken into account. This is achieved by further development of a continuum–discontinuous element method code, called GDEM, with a new type of dynamic bounding surface damage model being implemented, thus forming a bounding surface dynamic plasticity damage-GDEM model (DB-GDEM). Both continuous and discontinuous mechanical behaviours of rocks have been captured well by the newly developed DB-GDEM model. The main multi-scale dynamic characteristics of rock subjected to blasting and impact, including particle movement, fragmentation of rock mass, stress wave propagation, and failure models, have been captured. Good agreement among modelling results and solutions reported in literature demonstrates the capability of DB-GDEM. The introduction of bounding surface plasticity damage model in GDEM would reproduce a more realistic dynamic damage response of rock compared with the original GDEM model that embedded with conventional constitutive models.
在大多数地下工程中,岩石在爆破和冲击作用下的动态响应一直受到关注。由于惯性效应引起的尺寸效应和应变速率增强,岩石和地下结构的动态响应呈现多尺度特征。因此,为了更好地理解岩石的多尺度动态响应,需要同时考虑计算精度和数值效率。为此,我们进一步开发了连续-非连续单元法代码(GDEM),并采用了新型的边界面动态损伤模型,从而形成了边界面动态塑性损伤-GDEM 模型(DB-GDEM)。新开发的 DB-GDEM 模型很好地捕捉了岩石的连续和不连续力学行为。模型捕捉到了岩石在爆破和冲击作用下的主要多尺度动态特征,包括颗粒运动、岩体破碎、应力波传播和破坏模型。建模结果与文献报道的解决方案之间的良好一致性证明了 DB-GDEM 的能力。与嵌入传统构造模型的原始 GDEM 模型相比,在 GDEM 中引入边界面塑性破坏模型将再现更真实的岩石动态破坏响应。
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引用次数: 0
APPLICATION OF SKELETAL BIOMECHANICS TO STRUCTURAL SYSTEMS 骨骼生物力学在结构系统中的应用
IF 1.4 4区 工程技术 Q2 Engineering Pub Date : 2023-12-01 DOI: 10.1615/intjmultcompeng.2023050245
Sindhu Nachiar S, Satyanarayanan K S
The concept of green construction enables a revolutionary change in construction sector in terms of design, production, and management. One such method is introducing the concept of biomimicry. Biomimicry is utilized in the field of design to solve problems. This paper mainly discusses about the mimicking of human skeleton for structural design. The idea is mimicking humerus bone as a tension member and femur bone as a compression member. The optimized members of compression and tension (strut and tie) were put together to form the mimicked king post truss analytically with the conventional cross section truss with average diameter, maximum diameter, and equivalent self-weight to the members of mimicked truss and experimentally testing with non-destructive test and point load test.The result shows that the ultimate load carrying capacity of critical compression member and tension member was 846.16 kN and 1952 kN respectively. Whereas, the achieved load was 780.30 kN and 1729 kN.Also, the ratio of analytical stiffness to self-weight is 21.83 mm-1 and the ratio of experimental stiffness to self-weight was 19.15 mm-1. Therefore, from the results it was observed that the equivalent results for mimic truss can be achieved in a truss which is modeled of equivalent self-weight. Hence the development and use of structural elements using biomimicry is feasible and that will lead to economic, green and energy efficient structures.
绿色建筑的概念使建筑行业在设计、生产和管理方面发生了革命性的变化。其中一种方法就是引入生物模拟概念。仿生学在设计领域被用来解决问题。本文主要讨论模仿人体骨骼进行结构设计。其思路是模仿肱骨作为受拉构件,股骨作为受压构件。结果表明,临界受压构件和受拉构件的极限承载力分别为 846.16 kN 和 1952 kN。此外,分析刚度与自重之比为 21.83 mm-1,实验刚度与自重之比为 19.15 mm-1。因此,从结果中可以看出,模拟桁架的等效结果可以通过自重等效的桁架模型来实现。因此,利用仿生学开发和使用结构元素是可行的,这将带来经济、绿色和节能的结构。
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引用次数: 0
A New Criterion for the Human Knee Osteoarthritis Characterization: Finite Element modelling 人类膝关节骨性关节炎表征的新标准:有限元建模
IF 1.4 4区 工程技术 Q2 Engineering Pub Date : 2023-11-01 DOI: 10.1615/intjmultcompeng.2023048267
Zahra TRAD, Abdelwahed BARKAOUI
Osteoarthritis (OA), characterized by the degradation of articular cartilage, is a musculoskeletal disease that occurs as the result of variations in the mechanical stress and strain applied to the knee joint. Since damaged cartilage has very poor intrinsic repair and regenerative capacity, numerical modeling complemented by experimental studies have been widely investigated to examine the causes of OA development. However, the responses of the articular cartilage to a load distributed as a function of knee laxity in the frontal plane have not been studied numerically. Accordingly, we provide in this paper a 3D finite element (FE) model of the knee joint obtained from Magnetic Resonance Imaging (MRI) dataset, in order to assess the biomechanical responses of cartilage. The main goal of this work is to develop a new methodology to quantify the load applied to the knee and to propose a new criterion for characterizing cartilage wear based on arthroscopic and radiological classifications. In the situations of varus and valgus laxity, the FE analysis demonstrated that degenerative cartilage degradation is seen to be larger for higher abnormalities. Moreover, numerical modeling of the new criterion allowed for the identification of OA phases based on the rate of cartilage wear measured for the various FE knee models.
骨关节炎(OA),以关节软骨退化为特征,是一种肌肉骨骼疾病,由于施加于膝关节的机械应力和应变的变化而发生。由于受损软骨具有非常差的内在修复和再生能力,数值模拟和实验研究相结合被广泛用于研究OA发生的原因。然而,关节软骨对负载的响应作为膝关节前部平面松弛度的函数分布尚未进行数值研究。因此,我们在本文中提供了一个从磁共振成像(MRI)数据集获得的膝关节三维有限元(FE)模型,以评估软骨的生物力学反应。这项工作的主要目标是开发一种新的方法来量化施加在膝盖上的负荷,并提出一种新的标准来表征基于关节镜和放射学分类的软骨磨损。在内翻和外翻松弛的情况下,FE分析表明,退行性软骨退化程度越大,异常程度越高。此外,新标准的数值模拟允许基于对各种FE膝关节模型测量的软骨磨损率来识别OA阶段。
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引用次数: 0
Effects of cyclic traffic loads and seawater erosion on suffusion of crushed calcareous sands 循环交通荷载和海水侵蚀对破碎钙质砂渗透的影响
IF 1.4 4区 工程技术 Q2 Engineering Pub Date : 2023-11-01 DOI: 10.1615/intjmultcompeng.2023049633
Hao Xiong, Rui Tang, Zhen-yu Yin, Hanqing Chen, Zhimin Zhang, Yuanyi Qiu, Runqi Zhang
Calcareous sands, in contrast to ordinary terrestrial source sands, are characterized by their propensity for fragmentation. This leads to the fracturing of calcareous sands within the foundation under the impact of traffic loads. The crushed calcareous sands then experience suffusion due to cyclic wave action, potentially causing foundation settlement. However, limited research has been conducted on the effects of varying load frequencies and magnitudes on road foundations subjected to cyclic traffic loads. In this study, a series of numerical case studies employing the CFD-DEM method are conducted. The macroscopic and microscopic effects of load magnitude and frequency on fines loss mass, fines loss rate, soil surface displacement, and microstructure are analyzed. The results indicate that as the traffic load magnitude increases and frequency decreases, fines loss mass and volumetric strain of the soil decrease, reducing the suffusion effect on the foundation. These findings provide valuable insights for the development of micromechanical constitutive models for calcareous sands and the design of transportation infrastructure.
钙质砂与普通陆源砂不同,其特点是易碎裂。这就导致了在交通荷载的作用下,地基内部的钙质砂发生破裂。破碎后的钙质砂在循环波浪作用下会发生溢流,可能导致地基沉降。然而,对于不同频率和强度的荷载对道路基础在循环交通荷载作用下的影响的研究却很少。本研究采用CFD-DEM方法进行了一系列数值案例研究。分析了加载幅度和频率对细碎颗粒损失质量、细碎颗粒损失率、土壤表面位移和微观结构的宏观和微观影响。结果表明:随着交通荷载强度的增大和频率的减小,土体的细粒损失质量和体积应变减小,对地基的渗透影响减小;这些发现为钙质砂微观力学本构模型的发展和交通基础设施的设计提供了有价值的见解。
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引用次数: 0
Multi-Band Flexible UWB Antenna for Flexible Electronics and Biomedical Applications 用于柔性电子和生物医学应用的多波段柔性超宽带天线
IF 1.4 4区 工程技术 Q2 Engineering Pub Date : 2023-01-01 DOI: 10.1615/intjmultcompeng.2023046873
P. R., Thamarai Selvi G, Annaram Karuppiah, Venkatalakshmi K, J. M, Banu Priya Prathaban
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引用次数: 0
Evaluation of dissipation energy for isotropic continuum damage mechanics model with adaptive time step control approach 基于自适应时间步长控制方法的各向同性连续损伤力学模型耗散能评估
IF 1.4 4区 工程技术 Q2 Engineering Pub Date : 2023-01-01 DOI: 10.1615/intjmultcompeng.2023045347
N. Liu, Zifeng Yuan
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引用次数: 0
Intramedullary Nail or Locking Compression Plate For Fixing a Fractured Distal Tibia: Finite Element Analysis Along With an Adaptation Model 髓内钉或锁定加压钢板固定胫骨远端骨折:有限元分析及适应模型
IF 1.4 4区 工程技术 Q2 Engineering Pub Date : 2023-01-01 DOI: 10.1615/intjmultcompeng.2023048159
G. Rouhi, Amirhosein Moslehi
{"title":"Intramedullary Nail or Locking Compression Plate For Fixing a Fractured Distal Tibia: Finite Element Analysis Along With an Adaptation Model","authors":"G. Rouhi, Amirhosein Moslehi","doi":"10.1615/intjmultcompeng.2023048159","DOIUrl":"https://doi.org/10.1615/intjmultcompeng.2023048159","url":null,"abstract":"","PeriodicalId":50350,"journal":{"name":"International Journal for Multiscale Computational Engineering","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67461729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
期刊
International Journal for Multiscale Computational Engineering
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