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Particle swarm optimization model to predict scour depth around a bridge pier

Frontiers of Structural and Civil Engineering 2020年第4期14卷 855-866页

作者： Shahaboddin SHAMSHIRBAND Amir MOSAVI timon rabczuk Department for Management of Science and Technology Development Ton Duc Thang UniversiyHo Chi Minh CityVietmam Faculty of Information Technology Ton Duc Thang UniversityHo Chi Minh CityVietnam Institute of Automation Kando Kalman Faculy of Electrical EngineeringObuda UniversiyBudapest 1034Hungary Department of Mathematics and Informatics J.Selye UniversityKomarno 94501Slovakia School of the Built Environment Oxford Brookes UniversityOxford OX30BPUK Instiute of Structural Mechanics Bauhaus-Universitat WeimarWeimar 99423Germany

Scour depth around bridge piers plays a vital role in the safety and stability of the *** former approaches used in the prediction of scour depth are based on regression models or black box models in which the first one lacks enough accuracy while the later one does not provide a clear mathematical expression to easily employ it for other situations or ***,this paper aims to develop new equations using particle swarm optimization as a metaheuristic approach to predict scour depth around bridge *** improve the efficiency of the proposed model,individual equations are derived for laboratory and field ***,sensitivity analysis is conducted to achieve the most effective parameters in the estimation of scour depth for both experimental and filed data *** the results of the proposed model with those of existing regression-based equations reveal the superiority of the proposed method in terms of accuracy and ***,the ratio of pier width to flow depth and ratio of d50 (mean particle diameter)to flow depth for the laboratory and field data were recognized as the most effective parameters,*** derived equations can be used as a suitable proxy to estimate scour depth in both experimental and prototype scales.

关键词： scour depth bridge design and construction particle swarm optimization computational mechanics artificial intelligence bridge pier

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Computational modeling of fracture in capsule-based self-healing concrete: A 3D study

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Frontiers of Structural and Civil Engineering 2021年第6期15卷 1337-1346页

作者： Luthfi Muhammad MAULUDIN timon rabczuk Civil Engineering Department Gegerkalong Hilir Ds.CiwarugaBandung 40012Indonesia Institute of Structural Mechanics Bauhaus University of WeimarWeimar 99425Germany

We present a three-dimensional(3D)numerical model to investigate complex fracture behavior using cohesive *** efficient packing algorithm is employed to create the mesoscale model of heterogeneous capsulebased self-healing *** aggregates are used and directly generated from specified size distributions with different volume *** capsules are also used and created based on a particular diameter,and wall *** traction-separation laws of cohesive elements along the boundaries of the mortar matrix,aggregates,capsules,and their interfaces are pre-inserted to simulate crack initiation and *** pre-inserted cohesive elements are also applied into the initial meshes of solid elements to account for fracture in the mortar *** realizations are carried out and statistically *** proposed model provides an effective tool for predicting the complex fracture response of capsule-based self-healing concrete at the meso-scale.

关键词： 3D fracture self-healing concrete spherical cohesive elements heterogeneous

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The Multi-Horizon Peridynamics

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Computer Modeling in Engineering & Sciences 2019年第11期121卷 493-500页

作者： Ali Jenabidehkordi timon rabczuk Division of Computational Mechanics Ton Duc Thang UniversityHo Chi MinhVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi MinhVietnam

We present a novel refinement approach in peridynamics(PD).The proposed approach takes advantage of the PD flexibility in choosing the shape of the horizon by introducing multiple domains(with no intersections)to the nodes of the refinement *** will show that no ghost forces are needed when changing the horizon sizes in both *** approach is applied to both bond-based and state-based peridynamics and verified for a simple wave propagation refinement problem illustrating the efficiency of the method.

关键词： Peridynamics variable horizon size multi-horizon ghost force wave reflection refinement

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Isogeometric cohesive zone model for thin shell delamination analysis based on Kirchhoff-Love shell model

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Frontiers of Structural and Civil Engineering 2020年第2期14卷 267-279页

作者： Tran Quoc THAI timon rabczuk Xiaoying ZHUANG Institute o f Continuum Mechanics Leibniz University of HannoverHannover 30167Germany Division of Computational Mechanics Ton Due Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Due Thang UniversityHo Chi Minh CityVietnam

We present a cohesive zone model for delamination in thin shells and composite *** isogeometric(IGA)thin shell model is based on Kirchhoff-Love ***-Uniform Rational B-Splines(NURBS)are used to discretize the exact mid-surface of the shell geometry exploiting their C 1-continuity property which avoids rotational degrees of *** fracture process zone is modeled by interface elements with a cohesive *** numerical examples are presented to test and validate the proposed formulation in predicting the delamination behavior of composite structures.

关键词： cohesive zone model IGA Kirchhoff-Love model thin shell analysis delamination

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The effects of mismatch fracture properties in encapsulation-based self-healing concrete using cohesive-zone model

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Frontiers of Structural and Civil Engineering 2020年第3期14卷 792-801页

作者： Luthfi Muhammad MAULUDIN Chahmi OUCIF timon rabczuk Institute of Structural Mechanics Bauhaus University of WeimarWeimar 99423Germany Department of Civil Engineering Politebiik Negeri Bandung(POLBAN)Bandung 40012Indonesia Division of Computational Mechanics Ton Due Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Tori Due Thang UniversityHo Chi Minh CityVietnam

Finite element analysis is developed to simulate the breakage of capsule in capsule-based self-healing concrete.A 2D circular capsule with different core-shell thickness ratios embedded in the mortar matrix is analyzed numerically along with their interfacial transition ***-thickness cohesive elements are pre-inserted into solid elements to represent potential *** study focuses on the effects of mismatch fracture properties,namely fracture strength and energy,between capsule and mortar matrix into the breakage likelihood of the *** extensive simulations of 2D specimens under uniaxial tension were carried out to investigate the key features on the fracture patterns of the capsule and produce the fracture maps as the *** developed fracture maps of capsules present a simple but valuable tool to assist the experimentalists in designing appropriate capsule materials for self-healing concrete.

关键词： self-healing concrete interfacial zone capsule materials cohesive elements fracture maps

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Parametric Study of Hip Fracture Risk Using QCT-Based Finite Element Analysis

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Computers, Materials & Continua 2022年第4期71卷 1349-1369页

作者： Hossein Bisheh Yunhua Luo timon rabczuk Department of Mechanical Engineering University of ManitobaWinnipegR3T 5V6Canada Institute of Structural Mechanics Bauhaus-Universität WeimarWeimar99423Germany Department of Biomedical Engineering University of ManitobaWinnipegR3T 5V6Canada

Various parameters such as age,height,weight,and body mass index(BMI)influence the hip fracture risk in the elderly which is the most common injury during the sideways *** paper presents a parametric study of hip fracture risk based on the gender,age,height,weight,and BMI of subjects using the subject-specific QCT-based finite element modelling and simulation of single-leg stance and sideways fall *** fracture risk is estimated using the strain energy failure criterion as a combination of bone stresses and strains leading to more accurate and reasonable results based on the bone failure *** the effects of various parameters on hip fracture risk can help to prescribe more accurate preventive and treatment plans for a community based on the gender,age,height,weight,and BMI of the *** of this study show an increase in hip fracture risk with the increase of age,body height,weight,and BMI in both women and men under the single-leg stance and the sideways fall configurations.

关键词： Hip fracture risk finite element model strain energy parametric study

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Effects of time-varying liquid bridge forces on rheological properties,and resulting extrudability and constructability of three-dimensional printing mortar

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Frontiers of Structural and Civil Engineering 2023年第9期17卷 1295-1309页

作者： Peng ZHI Yu-Ching WU timon rabczuk Department of Structural Engineering Tongji UniversityShanghai 200092China Institute of Structural Mechanics Bauhaus University of WeimarWeimar 99423Germany

Extrudability and constructability are two important,yet contradictory issues pertaining to the construction of three-dimensional(3D)printing *** is easily achieved when 3D printing cement mortar has a high water content and low cohesion,but the printed structure is easily ***,a 3D printing cement mortar with a low water content and high cohesion has a relatively stable printed structure although the cement mortar might not be *** study proposes a particle-based method to simulate 3D printing mortar extrusion and construction as an overall planning tool for building ***,a discrete element model with time-varying liquid bridge forces is developed to investigate the microscopic effects of these forces on global rheological ***,a series of numerical simulations relevant to 3D printable mortar extrudability and constructability are carried *** study demonstrates that the effects of time-varying liquid bridge forces on rheological properties and the resulting extrudability and constructability of 3D printing mortar are ***,an optimized region that satisfies both the extrusion and construction requirements is provided for 3D printing industry as a reference.

关键词： particle-based simulation liquid bridge force rheological property 3D printing mortar extrudability constructability

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Predicting the Electronic and Structural Properties of Two-Dimensional Materials Using Machine Learning

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Computers, Materials & Continua 2021年第4期67卷 1287-1300页

作者： Ehsan Alibagheri Bohayra Mortazavi timon rabczuk Department of Physics University of TehranTehran14395-547Iran Department of Mathematics and Physics Leibniz Universität HannoverHannover30157Germany Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

Machine-learning(ML)models are novel and robust tools to establish structure-to-property connection on the basis of computationally expensive ab-initio *** advanced technologies,predicting novel materials and identifying their specification are critical ***-dimensional(2D)materials are currently a rapidly growing class which show highly desirable properties for diverse advanced *** this work,our objective is to search for desirable properties,such as the electronic band gap and total energy,among others,for which the accelerated prediction is highly appealing,prior to conducting accurate theoretical and experimental *** all available componential methods,gradient-boosted(GB)ML algorithms are known to provide highly accurate predictions and have shown great potential to predict material properties based on the importance of *** this work,we applied the GB algorithm to a dataset of electronic and structural properties of 2D materials in order to predict the specification with high *** statistical analysis of the selected features identifies design guidelines for the discovery of novel 2D materials with desired properties.

关键词： 2D materials machine-learning gradient-boosted band gap

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Forced Vibration Analysis of Functionally Graded Anisotropic Nanoplates Resting on Winkler/Pasternak-Foundation

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Computers, Materials & Continua 2020年第2期62卷 607-629页

作者： Behrouz Karami Maziar Janghorban timon rabczuk Department of Mechanical Engineering Marvdasht BranchIslamic Azad UniversityMarvdashtIran Institute of Research and Development Duy Tan UniversityDa NangViet Nam

This study investigates the forced vibration of functionally graded hexagonal nano-size plates for the first time.A quasi-three-dimensional(3D)plate theory including stretching effect is used to model the anisotropic plate as a continuum one where small-scale effects are considered based on nonlocal strain gradient ***,the plate is assumed on a Pasternak foundation in which normal and transverse shear loads are taken into *** governing equations of motion are obtained via the Hamiltonian principles which are solved using analytical based methods by means of Navier’s *** influences of the exponential factor,nonlocal parameter,strain gradient parameter,Pasternak foundation coefficients,length-to-thickness,and length-to-width ratios on the dynamic response of the nanoplates are *** addition,the accuracy of an isotropic approximate instead of the anisotropic model is *** dynamic behavior of the system shows that mechanical mathematics-based models may get better results considering the anisotropic model because the dynamic response can cause prominent differences(up to 17%)between isotropic approximation and anisotropic model.

关键词： Functionally graded materials dynamic deflection nonlocal train gradient theory Winkler-Pasternak elastic foundation

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A Nonlocal Operator Method for Partial Differential Equations with Application to Electromagnetic Waveguide Problem

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Computers, Materials & Continua 2019年第4期59卷 31-55页

作者： timon rabczuk Huilong Ren Xiaoying Zhuang Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam Institute of Structural Mechanics Bauhaus-University Weimar99423 WeimarGermany Institute of Continuum Mechanics Leibniz University HannoverHannoverGermany State Key Laboratory of Disaster Reduction in Civil Engineering College of Civil EngineeringTongji UniversityShanghai200092China

A novel nonlocal operator theory based on the variational principle is proposed for the solution of partial differential *** differential operators as well as the variational forms are defined within the context of nonlocal *** present nonlocal formulation allows the assembling of the tangent stiffness matrix with ease and simplicity,which is necessary for the eigenvalue analysis such as the waveguide *** present formulation is applied to solve the differential electromagnetic vector wave equations based on electric *** governing equations are converted into nonlocal integral *** hourglass energy functional is introduced for the elimination of zeroenergy ***,the proposed method is validated by testing three classical benchmark problems.

关键词： Nonlocal operator method Variational principle Nonlocal operators Hourglass mode

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