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Effect of fin density and fin height on flow-induced vibration behavior of finned tube arrays subjected to water cross flow 翅片密度和翅片高度对水错流作用下翅片管阵列流激振动特性的影响
IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-05 DOI: 10.1108/mmms-08-2022-0163
S. Desai, Mangalsing Narsing Sonare
PurposeThe prediction of critical velocity at instability threshold for shell and tube heat exchangers is important to avoid failure of tubes as a result of flow-induced vibrations due to water cross flow. The flow-induced vibration in finned tube heat exchangers is affected by various parameters such as fin height, fin pitch, fin material, tube array, pitch ratio, fin type, fluid velocity etc. In this paper, an experimental investigation of fluid elastic instability in shell and tube heat exchangers is carried out by subjecting normal square finned tube arrays of pitch ratio 1.79 to water cross flow.Design/methodology/approachThe five tube arrays, namely plain array, two finned tube arrays with 3 fpi and 9 fpi fin density, and two finned tube arrays with 3 mm and 6 mm fin height are tested in the experimental test setup with water flow loop and vibration measurement system. The research objective is to evaluate the effect of fin density and fin height on the instability threshold. The critical velocity at instability threshold is determined to characterize the fluid elastic instability behavior of different tube arrays. The vortex shedding behavior of the tube arrays is also studied by determining Strouhal number corresponding to the small peaks before fluid elastic instability.FindingsThe fluid elastic instability behavior of the tube arrays was found to be the function of fin tube parameters. The experimental results indicate that an increase in fin density and fin height results in delaying the instability threshold for finned tube arrays. It is also observed that critical velocity at instability is increased for finned tube arrays compared to plain tube arrays of the same pitch ratio. The design modifications in the outer box have resulted in further reduction in the natural frequency. This enabled to reach clear instability for all the five-tube arrays.Originality/valueThe research data add the value to the present body of knowledge by knowing the effect of fin height and fin density on the fluid elastic instability threshold of normal square finned tube arrays subjected to water cross flow.
目的壳管式换热器失稳临界值的临界速度预测,对于避免水交叉流动引起的流激振动导致管件失效具有重要意义。翅片管换热器的流激振动受翅片高度、翅片节距、翅片材料、管阵、节距比、翅片类型、流体速度等参数的影响。本文采用节距比为1.79的普通方翅片管阵列,对管壳式换热器的流体弹性失稳特性进行了实验研究。设计/方法/方法在水流回路和振动测量系统的实验测试装置上,对平面阵列、2个翅片管阵列(翅片密度分别为3fpi和9fpi)和2个翅片管阵列(翅片高度分别为3mm和6mm)进行了实验测试。研究目的是评估鳍密度和鳍高度对不稳定阈值的影响。确定了不稳定阈值处的临界速度,以表征不同管阵的流体弹性不稳定行为。通过确定流体弹性失稳前小峰对应的斯特劳哈尔数,研究了管阵的涡脱落行为。发现翅片管阵列的流体弹性失稳行为是翅片管参数的函数。实验结果表明,增加翅片密度和翅片高度可以延迟翅片管阵列的失稳阈值。研究还发现,在相同螺距比下,翅片管阵列的临界不稳定速度比普通管阵列高。外箱的设计修改进一步降低了固有频率。这使得所有五管阵列都能达到明显的不稳定性。独创性/价值研究数据通过了解鳍高和鳍密度对普通方形翅片管阵列在水流交叉作用下流体弹性失稳阈值的影响,为现有的知识体系增加了价值。
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引用次数: 0
Magnetohydrodynamic hybrid nanofluid flow over a decelerating rotating disk with Soret and Dufour effects 具有Soret和Dufour效应的减速旋转圆盘上磁流体动力混合纳米流体的流动
IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-03 DOI: 10.1108/mmms-08-2022-0160
N. Vijay, K. Sharma
PurposeThe investigation of fluid flow over a rotating disk has been increasing due to the spread of machine technology. Because of this development, we scrutinized the Magnetohydrodynamic (MHD) flow of hybrid nanofluid caused by a decelerating rotating disk with Ohmic heating, Soret and Dufour effects. The disk's angular velocity is taken to be an inversely time-dependent linear function. Moreover, the temperature-dependent viscosity of hybrid nanofluid is incorporated in the present investigation. Methanol is considered as base fluid, while copper oxide (CuO) and magnesium oxide (MgO) are nanoparticles.Design/methodology/approachEstimated fundamental partial differential equations of flow problems are altered as a dimensionless system of ordinary differential equations using appropriate similarity transformation and solved using a numerical technique: BVP Midrich scheme in Maple software. The impression of emerging non-dimensional parameters is portrayed graphically. All outcomes are shown in the velocity, temperature and concentration profiles.FindingsThe developed flow problem involves a non-dimensional parameter (A) that reveals the deceleration of the disk. For larger values of A, the disk decelerates faster and for some fixed time, the fluid surrounding the disk revolves more rapidly than the disk itself. The radial velocity of fluid diminishes and axial velocity becomes uniform when the disk is subjected to wall suction velocity (B).Originality/valueThis analysis is significant in biomedical engineering, cancer therapeutic, manufacturing industries and nano-drug suspension in pharmaceuticals. The novelty of the current study is the hybrid nanofluid flow with Ohmic heating, Soret and Dufour effects on a decelerating rotating disk. To the best of the author's knowledge, no such consideration has been published in the literature.
目的随着机械技术的发展,对旋转圆盘上流体流动的研究越来越多。由于这一进展,我们仔细研究了由减速旋转盘引起的混合纳米流体的磁流体动力学(MHD)流动,并伴有欧姆加热,Soret和Dufour效应。圆盘的角速度被认为是一个逆时线性函数。此外,混合纳米流体的黏度随温度的变化也被纳入了本研究。甲醇被认为是基液,而氧化铜(CuO)和氧化镁(MgO)是纳米颗粒。设计/方法/方法流动问题的估计基本偏微分方程被改变为一个无量纲系统的常微分方程使用适当的相似变换和解决使用数值技术:BVP Midrich方案在Maple软件。对出现的无量纲参数的印象用图形表示。所有结果都显示在速度、温度和浓度曲线中。所开发的流动问题涉及一个揭示圆盘减速的无量纲参数(a)。对于较大的A值,磁盘减速更快,并且在一段固定时间内,磁盘周围的流体比磁盘本身旋转得更快。当磁盘受到壁吸速度时,流体的径向速度减小,轴向速度趋于均匀(B)。独创性/价值该分析在生物医学工程,癌症治疗,制造业和制药中的纳米药物悬浮液中具有重要意义。当前研究的新颖之处是在减速旋转圆盘上混合纳米流体的欧姆加热、索雷特和杜福效应。据作者所知,没有这样的考虑已发表在文献中。
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引用次数: 11
Convective-radiative moving porous fin with temperature-dependent thermal conductivity, heat transfer coefficient and wavelength-dependent surface emissivity 具有温度相关导热系数、传热系数和波长相关表面发射率的对流辐射移动多孔翅片
IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-02 DOI: 10.1108/mmms-07-2022-0120
Parvinder Kaur, Surjan Singh
PurposeIn this paper, temperature distribution and fin efficiency in a moving porous fin have been discussed. The heat transfer equation is formulated by using Darcy's model. Heat transfer coefficient and thermal conductivity vary with temperature. The surface emissivity of the fin varies with temperature as well as with wavelength. Thermal conductivity is taken as a linear and quadratic form of temperature. The entire analysis of the paper is presented in non-dimensional form.Design/methodology/approachIn this study, a new mathematical model is investigated. The novelty of this model is surface emissivity which is considered temperature and wavelength dependent. Another interesting point is the addition of porous material. The Legendre wavelet collocation method has been used to solve the nonlinear heat transfer equation. Numerical simulations are carried out in MATLAB software.FindingsAn attempt has been made to discuss temperature distribution in the presence of porosity and wavelength-temperature-dependent surface emissivity. The effect of various parameters on temperature has been discussed, including thermal conductivity, emissivity, convection-radiation, Peclet number, sink temperature, exponent “n” and porosity. Fin efficiency is also calculated for some parameters. According to the study, heat transfer rate increases with higher radiation-convection, emissivity, wavelength and porosity parameters.Originality/valueThe numerical results are carried out by using the Legendre wavelet collocation method, which has been compared with exact results in a particular case and found to be in good agreement. The percent error is calculated to find the error between the current method and the exact result. A comparison of the obtained results with the previous data is presented to validate the numerical results.
目的研究了移动多孔翅片的温度分布和翅片效率。采用达西模型建立了传热方程。传热系数和导热系数随温度的变化而变化。翅片的表面发射率随温度和波长而变化。导热系数是温度的线性和二次形式。本文的整个分析以无量纲形式呈现。在这项研究中,研究了一种新的数学模型。该模型的新颖之处在于表面发射率,它被认为与温度和波长有关。另一个有趣的地方是多孔材料的加入。用勒让德小波配置法求解了非线性传热方程。在MATLAB软件中进行了数值模拟。我们试图讨论孔隙率和波长温度相关的表面发射率存在时的温度分布。讨论了热导率、发射率、对流辐射、佩莱特数、汇温、指数n和孔隙率等参数对温度的影响。计算了一些参数下的翅片效率。研究表明,传热速率随辐射对流、发射率、波长和孔隙率参数的增大而增大。采用勒让德小波配置法进行了数值计算,并与具体算例的精确结果进行了比较,两者吻合较好。计算误差百分比是为了找出当前方法与确切结果之间的误差。将所得结果与以往的数据进行了比较,验证了数值结果的正确性。
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引用次数: 0
Machine learning applications to predict the axial compression capacity of concrete filled steel tubular columns: a systematic review 机器学习在预测钢管混凝土柱轴压能力中的应用:系统综述
IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-12-30 DOI: 10.1108/mmms-09-2022-0195
Aishwarya Narang, Ravi Kumar, A. Dhiman
PurposeThis study seeks to understand the connection of methodology by finding relevant papers and their full review using the “Preferred Reporting Items for Systematic Reviews and Meta-Analyses” (PRISMA).Design/methodology/approachConcrete-filled steel tubular (CFST) columns have gained popularity in construction in recent decades as they offer the benefit of constituent materials and cost-effectiveness. Artificial Neural Networks (ANNs), Support Vector Machines (SVMs), Gene Expression Programming (GEP) and Decision Trees (DTs) are some of the approaches that have been widely used in recent decades in structural engineering to construct predictive models, resulting in effective and accurate decision making. Despite the fact that there are numerous research studies on the various parameters that influence the axial compression capacity (ACC) of CFST columns, there is no systematic review of these Machine Learning methods.FindingsThe implications of a variety of structural characteristics on machine learning performance parameters are addressed and reviewed. The comparison analysis of current design codes and machine learning tools to predict the performance of CFST columns is summarized. The discussion results indicate that machine learning tools better understand complex datasets and intricate testing designs.Originality/valueThis study examines machine learning techniques for forecasting the axial bearing capacity of concrete-filled steel tubular (CFST) columns. This paper also highlights the drawbacks of utilizing existing techniques to build CFST columns, and the benefits of Machine Learning approaches over them. This article attempts to introduce beginners and experienced professionals to various research trajectories.
目的本研究通过查找相关论文并使用“系统评价和荟萃分析的首选报告项目”(PRISMA)对其进行全面审查,试图了解方法论之间的联系。近几十年来,钢管混凝土柱在施工中越来越受欢迎,因为它们提供了成分材料和成本效益。人工神经网络(Ann)、支持向量机(SVM)、基因表达程序设计(GEP)和决策树(DTs)是近几十年来在结构工程中被广泛用于构建预测模型的一些方法,从而产生有效和准确的决策。尽管对影响钢管混凝土柱轴压承载力(ACC)的各种参数进行了大量研究,但对这些机器学习方法没有系统的综述。发现研究了各种结构特征对机器学习性能参数的影响。总结了目前用于预测钢管混凝土柱性能的设计规范和机器学习工具的比较分析。讨论结果表明,机器学习工具可以更好地理解复杂的数据集和复杂的测试设计。独创性/价值本研究考察了用于预测钢管混凝土(CFST)柱轴向承载力的机器学习技术。本文还强调了利用现有技术构建CFST柱的缺点,以及机器学习方法相对于它们的好处。本文试图向初学者和经验丰富的专业人士介绍各种研究轨迹。
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引用次数: 1
Analytical studies of Eyring-Powell fluid models Eyring-Powell流体模型的分析研究
IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-12-21 DOI: 10.1108/mmms-10-2022-0208
Zehra Pinar Izgi
PurposeWhen the literature is reviewed carefully, the analytical solutions of these types of models are missing. First using appropriate similarity transformation, the equations are reduced to dimensionless form (NODE). To solve the reduced models, ansatz-based methods are considered. Finally, the explicit form solutions are obtained and the effects of material parameters and Prandtl number on the velocity and temperature profiles are shown in figures by the exact solutions. This study aims to discuss the aforementioned solution.Design/methodology/approachOne of the non-Newtonian fluids is Eyring-Powell (EP) fluid which is derived from the kinetic theory of fluids. Two variations of EP model are considered to obtain the exact solutions that are missing in the literature. In order to obtain exact solutions, one of the ansatz-based methods is considered. The effects of material parameters and Prandtl number on the velocity and temperature profiles are shown in figures by the exact solutions. The results will guide to develop the model to predict the velocity profile and temperature profile when experimental data for dimensionless material parameters of EP fluid are available.FindingsFinally, the explicit form solutions are obtained and the effects of material parameters and Prandtl number are shown in the figures. The results will guide to develop of the model to predict the velocity profile and temperature profile when experimental data for dimensionless material parameters of EP fluid are available. For the modified EP models, only special cases are considered. The generalized form, i.e. the modified EP models, which include deformation parameters, will be considered in the authors’ future work.Originality/valueWhen the literature is reviewed carefully, the analytical solutions of these types of models are missing so by this work, the gap in the literature is filled. The explicit form solutions are obtained and the effects of material parameters and Prandtl number on the velocity and temperature profiles are shown in figures.
目的当仔细回顾文献时,这些类型的模型的解析解是缺失的。首先,通过适当的相似变换,将方程简化为无量纲形式(NODE)。为了求解简化模型,考虑了基于ansatz的方法。最后得到了显式解,并通过精确解用图形表示了材料参数和普朗特数对速度和温度分布的影响。本研究旨在探讨上述解决方案。设计/方法/方法一种非牛顿流体是埃灵-鲍威尔(EP)流体,它是从流体动力学理论中衍生出来的。考虑了EP模型的两种变体,以获得文献中缺失的精确解。为了得到精确解,本文考虑了一种基于ansatz的方法。材料参数和普朗特数对速度和温度分布的影响用精确解用图形表示。研究结果将指导在获得极压流体无因次材料参数的实验数据后,建立预测极压流体速度分布和温度分布的模型。最后,得到了显式解,并在图中显示了材料参数和普朗特数的影响。研究结果将指导在获得极压流体无量纲材料参数的实验数据后,建立预测极压流体速度分布和温度分布的模型。对于修正的EP模型,只考虑特殊情况。作者将在未来的工作中考虑广义形式,即包含变形参数的修正EP模型。原创性/价值当仔细回顾文献时,这些类型模型的分析解决方案是缺失的,因此通过这项工作,填补了文献中的空白。得到了显式解,并给出了材料参数和普朗特数对速度和温度分布的影响。
{"title":"Analytical studies of Eyring-Powell fluid models","authors":"Zehra Pinar Izgi","doi":"10.1108/mmms-10-2022-0208","DOIUrl":"https://doi.org/10.1108/mmms-10-2022-0208","url":null,"abstract":"PurposeWhen the literature is reviewed carefully, the analytical solutions of these types of models are missing. First using appropriate similarity transformation, the equations are reduced to dimensionless form (NODE). To solve the reduced models, ansatz-based methods are considered. Finally, the explicit form solutions are obtained and the effects of material parameters and Prandtl number on the velocity and temperature profiles are shown in figures by the exact solutions. This study aims to discuss the aforementioned solution.Design/methodology/approachOne of the non-Newtonian fluids is Eyring-Powell (EP) fluid which is derived from the kinetic theory of fluids. Two variations of EP model are considered to obtain the exact solutions that are missing in the literature. In order to obtain exact solutions, one of the ansatz-based methods is considered. The effects of material parameters and Prandtl number on the velocity and temperature profiles are shown in figures by the exact solutions. The results will guide to develop the model to predict the velocity profile and temperature profile when experimental data for dimensionless material parameters of EP fluid are available.FindingsFinally, the explicit form solutions are obtained and the effects of material parameters and Prandtl number are shown in the figures. The results will guide to develop of the model to predict the velocity profile and temperature profile when experimental data for dimensionless material parameters of EP fluid are available. For the modified EP models, only special cases are considered. The generalized form, i.e. the modified EP models, which include deformation parameters, will be considered in the authors’ future work.Originality/valueWhen the literature is reviewed carefully, the analytical solutions of these types of models are missing so by this work, the gap in the literature is filled. The explicit form solutions are obtained and the effects of material parameters and Prandtl number on the velocity and temperature profiles are shown in figures.","PeriodicalId":46760,"journal":{"name":"Multidiscipline Modeling in Materials and Structures","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46579550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A comprehensive study on using expanded silica gel size as hollow sphere material in different aluminum alloy-based syntactic foams 膨胀硅胶作为空心球材料在不同铝合金基复合泡沫中的综合研究
IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-12-15 DOI: 10.1108/mmms-08-2022-0154
I. Yavuz, Ercan Şimşir, Alev Yildirim
PurposeMetal foams are a structural and functional composite materials that have received wide attention due to their specific structures and properties. The aim of this study is to investigate the mechanical properties of syntactic foam by using expanded silica gel with the spacer technique.Design/methodology/approachIn this research paper, the vacuum casting production method was used to produce metal syntactic foams including AlSi12 and AlSi8Cu3 matrix and expanded silica gel fillers with diameters of 2–4.75 mm and 4.75–5.6 mm.FindingsAs a result of the study, it was observed that as the foam densities increased, the compressive strength values of the samples increased due to the increasing volume fraction of the metallic matrix. Samples with the AlSi12 matrix showed higher compressive strength than samples with the AlSi8Cu3 matrix.Originality/valueThe originality of the study is the comparison of two different main matrix alloys (AlSi12 and AlSi8Cu3) and different pores using expanded silica gel.
金属泡沫材料是一种结构和功能复合材料,因其特殊的结构和性能而受到广泛关注。本研究的目的是利用膨胀硅胶和间隔剂技术研究复合泡沫的力学性能。本研究采用真空铸造法制备了直径为2 ~ 4.75 mm和4.75 ~ 5.6 mm的AlSi12、AlSi8Cu3基体和膨胀硅胶填料等金属复合泡沫材料。研究结果表明,随着泡沫密度的增加,试样的抗压强度值随着金属基体体积分数的增加而增加。AlSi12基体样品的抗压强度高于AlSi8Cu3基体样品。本研究的独创性在于比较了两种不同的主基体合金(AlSi12和AlSi8Cu3)和使用膨胀硅胶的不同孔隙。
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引用次数: 1
Numerical analysis of tensile failure of bolted composite laminates 螺栓连接复合材料层压板拉伸失效的数值分析
IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-12-12 DOI: 10.1108/mmms-06-2022-0118
Zhangxin Guo, Shiyi Wei, Pingyu Kuai, G. Chai, M. Wu, Jianguo Liang
PurposeThe influence of the number and arrangement of bolts on the tensile properties of bolted composite laminates was studied in the present study.Design/methodology/approachBased on the finite element model, the stiffness degradation method is used to simulate the damage evolution process for the failure of bolted composite laminates. Using ABAQUS finite element software combined with material failure criteria, the numerical calculation of the connection strength and failure mode of bolted composite laminates was carried out.FindingsThe results of the study show that the tensile strength of the composite laminates connected by three bolts is higher than that of the laminates connected by two bolts. And the arrangement of different bolts has a great influence on the failure strength of bolted laminates.Originality/valueBolted connection of composite laminates is a common problem in engineering practice. The effect of bolt arrangement and number on the strength of composite laminates is studied in this manuscript.
目的研究螺栓数量和排列方式对螺栓连接复合材料层压板拉伸性能的影响。设计/方法/方法基于有限元模型,采用刚度退化法模拟螺栓连接复合材料层压板失效的损伤演化过程。利用ABAQUS有限元软件,结合材料失效准则,对螺栓连接复合材料层压板的连接强度和失效模式进行了数值计算。研究结果表明,三螺栓连接的复合材料层压板的抗拉强度高于两螺栓连接的层压板。不同螺栓的布置对螺栓层压板的失效强度有很大影响。独创性/价值复合材料层压板的螺栓连接是工程实践中常见的问题。本文研究了螺栓排列和数量对复合材料层压板强度的影响。
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引用次数: 0
Finite element modelling of reinforced concrete one-way slabs strengthened using basalt textile reinforced mortars 玄武岩纤维增强砂浆加固钢筋混凝土单向板的有限元模拟
IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-12-02 DOI: 10.1108/mmms-07-2022-0134
N. Revanna, Charles K. S. Moy
PurposeThis paper employs a textile reinforcement strain comparison to study the response of Textile Reinforced Mortars (TRM) strengthened reinforced concrete one-way slab members in flexure using the finite element method. Basalt TRM (BTRM) is a relatively new composite in structural strengthening applications. Experimental data on BTRMs are limited in the literature and numerical analyses can help further the understanding of this composite. With this notion, Abaqus finite element software is utilised to create a numerical method to capture the mechanical response of strengthened slab members instead of time-consuming laboratory experiments.Design/methodology/approachA numerical method is developed and validated using existing experimental data set on one-way slabs strengthened using Basalt TRMs from the literature. An explicit solver is utilised to analyse the finite element model created using calibrated Concrete Damage Plasticity (CDP) parameters according to the experimental requirements. The generated model is applied to extract load, deflection and rebar strains sustained by strengthened reinforced concrete slabs as observed from the experimental reference chosen. The applicability of the developed model was studied beyond parametric studies by comparing the generated finite element tensile strain by the textile fibre with available formulae.FindingsCDP calibration done has shown its adaptability. The predicted results in the form of load versus deflection, tensile and compressive damage patterns from the numerical analysis showed good agreement with the experimental data. A parametric study on various concrete strength, textile spacing and TRM bond length obtained shows TRM’s advantages and its favourability for external strengthening applications. A set of five formulae considered to predict the experimental strain showed varied accuracy.Originality/valueThe developed numerical model considers strain sustained by the textile fibre to make results more robust and reliable. The obtained strain from the numerical study showed good agreement with the experiment results.
目的采用织物-钢筋应变比较法,采用有限元方法研究了织物-砂浆(TRM)加固钢筋混凝土单向板构件的受弯响应。玄武岩TRM(BTRM)是一种在结构加固应用中相对较新的复合材料。BTRM的实验数据在文献中是有限的,数值分析可以帮助进一步理解这种复合材料。有了这个概念,Abaqus有限元软件被用来创建一种数值方法来捕捉加固板构件的力学响应,而不是耗时的实验室实验。设计/方法/方法利用文献中玄武岩TRM加固单向板的现有实验数据集,开发并验证了一种数值方法。根据实验要求,使用显式求解器来分析使用校准的混凝土损伤塑性(CDP)参数创建的有限元模型。所生成的模型用于提取从选定的实验参考中观察到的加固钢筋混凝土板所承受的荷载、挠度和钢筋应变。通过将纺织纤维产生的有限元拉伸应变与现有公式进行比较,研究了所开发模型的适用性,超出了参数研究的范围。所做的CDP校准结果表明了它的适应性。数值分析的载荷与挠度、拉伸和压缩损伤模式的预测结果与实验数据吻合良好。对不同混凝土强度、织物间距和TRM粘结长度的参数研究表明,TRM的优点及其在外部加固应用中的优越性。一组五个用来预测实验应变的公式显示出不同的准确性。独创性/价值所开发的数值模型考虑了纺织纤维所承受的应变,使结果更加稳健和可靠。数值研究得到的应变与实验结果吻合较好。
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引用次数: 0
Parametric mathematical modeling and 3D response surface analysis for rod to plate friction welding of AISI 1020 steel/AISI 1018 steel AISI 1020钢/ASI 1018钢杆板摩擦焊的参数化数学建模和三维响应面分析
IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-12-01 DOI: 10.1108/mmms-08-2022-0148
Dhamothara kannan Thirumalaikkannan, Sivaraj Paramasivam, Balasubramanian Visvalingam, Tushar Sonar, Sathiya Sivaraj
PurposeRotary friction welding (RFW) was used to solve the issues in fusion welding of rod to plate joints of low carbon steel (AISI 1020 steel/AISI 1018 steel) such solidification cracking, wider heat affected zone (HAZ), lower HAZ hardness, high residual stresses and distortion. The main objective of this investigation is to develop parametric mathematic models (PMMs), 3D response surface analysis to predict tensile strength (TS) and weld interface hardness (WIH) of rod to plate joints and correlate microstructure with TS and WIH of rod to plate joints.Design/methodology/approachThe three-factor x five-level central composite design (CCD) consisting fewer experiments was employed for designing experimental matrix. The tensile and microhardness tests were performed to evaluate mechanical performance of joints. The PMMs of TS and WIH of rod to plate joints were developed using polynomial regression equations incorporating the RFW parameters. The 3D response surfaces were developed using response surface methodology (RSM) to optimize RFW parameters for joining AISI 1020/AISI 1018 rod to plate.FindingsThe joints made using friction pressure/friction time (FRNP/FRNT) of 3.71 MPa/s, forging pressure/forging time (FRGP/FRGT) of 3.71 MPa/s and rotational speed (RTSP) of 19.99 rps exhibited higher TS and WIH of 452 MPa and 252 HV0.5. The PMMs accurately predicted TS and WIH of rod to plate joints at less than 1.5% error and 95% confidence. The RTSP revealed greater effect on TS and WIH of rod to plate joints followed by FRGP/FRGT and FRNP/FRNT. The superior TS and WIH of joints developed using optimized process parameters is correlated to the evolution of finer bainitic microstructure in weld interface due to the dynamic recrystallization of grains ensued by optimum frictional heating and plastic deformation.Originality/valueThe PMMs were developed for predicting TS and WIH of joints. The RFW parameters were optimized to enhance TS and WIH of joints. Low carbon steel rod to plates joints were developed using RFW for automotive applications without fusion welding defects. The microstructural features of low strength and high strength rod to plate joints were correlated to the TS and WIH of rod to plate joints.
目的采用旋转摩擦焊(RFW)解决低碳钢(AISI 1020钢/ASI 1018钢)杆板接头熔焊中存在的凝固开裂、热影响区(HAZ)较宽、HAZ硬度较低、残余应力较大和变形等问题。本研究的主要目的是开发参数数学模型(PMM)和三维响应面分析,以预测杆-板接头的抗拉强度(TS)和焊缝界面硬度(WIH),并将微观结构与杆-板连接的TS和WIH相关联。设计/方法/方法采用由较少实验组成的三因素×五水平中心复合材料设计(CCD)来设计实验矩阵。进行了拉伸和显微硬度测试,以评估接头的力学性能。采用包含RFW参数的多项式回归方程,建立了杆板节点TS和WIH的PMM。使用响应面方法(RSM)开发3D响应面,以优化将AISI 1020/ASI 1018杆连接到板的RFW参数。结果:采用3.71MPa/s的摩擦压力/摩擦时间(FRNP/FRNT)、3.71MPam/s的锻造压力/锻造时间(FRGP/FRGT)和19.99rps的转速(RTSP)制成的接头表现出较高的TS和WIH,分别为452MPa和252HV0.5。PMM准确地预测了杆板接头的TS和WIH,误差小于1.5%,置信度小于95%。RTSP对杆板接头的TS和WIH影响较大,其次是FRGP/FRGT和FRNP/FRNT。使用优化的工艺参数开发的接头的优异TS和WIH与由于最佳摩擦加热和塑性变形引起的晶粒动态再结晶而在焊接界面中形成更细的贝氏体组织有关。独创性/价值PMM用于预测关节的TS和WIH。优化RFW参数以提高关节的TS和WIH。使用RFW开发了低碳钢杆板接头,用于汽车应用,没有熔焊缺陷。低强度和高强度杆-板接头的微观结构特征与杆-板连接的TS和WIH有关。
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引用次数: 3
Post-buckling analysis of shell-like structures using an implicit dynamic time integration scheme 基于隐式动力时间积分格式的类壳结构后屈曲分析
IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-11-28 DOI: 10.1108/mmms-07-2022-0128
D. Boutagouga, S. Mamouri
PurposeThis paper aims to investigate post-buckling responses of shell-like structures using an implicit conservative-decaying time integration dynamic scheme.Design/methodology/approachIn this work, the authors have proposed the use of a four-node quadrilateral flat shell finite element with drilling rotational degree of freedom within the framework of an updated Lagrangian formulation mutually with an implicit conservative-dissipative time integration dynamic scheme.FindingsSeveral numerical simulations were considered to evaluate the accuracy, robustness, stability and the capacity of the considered time integration scheme to dissipate numerical noise in the presence of high frequencies. The obtained results illustrate a very satisfying performance of the implicit conservative-dissipative direct time integration scheme conjointly with the quadrilateral flat shell finite element with drilling rotation.Originality/valueThe authors have investigated the potential of the implicit dynamic scheme to deal with unstable branches after limit points in the non-linear post-buckling response of shell structures with no need for structural damping. The capability of the studied algorithm to study buckling and post-buckling behaviour of thin shell structures is illustrated through several numerical examples.
目的本文采用隐式保守衰减时间积分动力格式研究类壳结构的后屈曲响应。设计/方法/方法在这项工作中,作者提出了在更新的拉格朗日公式框架内使用具有钻孔旋转自由度的四节点四边形扁壳有限元,该公式与隐式保守耗散时间积分动力学格式相互作用。发现考虑了几个数值模拟来评估所考虑的时间积分方案在高频情况下消散数值噪声的准确性、稳健性、稳定性和能力。结果表明,隐式守恒耗散直接时间积分格式与带钻孔旋转的四边形扁壳有限元相结合,具有非常令人满意的性能。原创性/价值作者研究了隐式动力方案在不需要结构阻尼的情况下处理壳体结构非线性后屈曲响应中极限点后的不稳定分支的潜力。通过几个算例说明了所研究的算法研究薄壁结构屈曲和后屈曲行为的能力。
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引用次数: 1
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Multidiscipline Modeling in Materials and Structures
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