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Hardness and corrosion behaviour of stir cast LM26 Al/sugar palm fibre ash composites 搅拌铸造LM26铝/糖棕榈纤维灰复合材料的硬度和腐蚀行为
IF 2 4区 材料科学 Q1 Mathematics Pub Date : 2023-05-23 DOI: 10.1108/mmms-10-2022-0219
I. Aliyu, S. M. Sapuan, E. S. Zainudin, M. Zuhri, Y. Ridwan
PurposeThe conflicting results on the corrosion characteristics of aluminium matrix composites reinforced with agrarian waste have stimulated an investigation on the hardness and corrosion rate of sugar palm fibre ash (SPFA) reinforced LM26 Al/alloy composite by varying the SPFA from 0 to 10 wt% in an interval of 2 wt%. This paper aims to discuss the aforementioned issue.Design/methodology/approachThe composites were produced via stir-casting and the hardness was determined using a Vickers hardness testing machine, corrosion rate was examined through the weight loss method by immersion in 0.5, 1.0 and 1.5 M hydrochloric acid (HCl) at temperatures of 303, 318, and 333 K for the maximum duration of 120 h. The morphological study was conducted using a scanning electron microscope (SEM) on the samples before and after immersion in HCl.FindingsThe incorporation of SPFA improved the hardness of the alloy from 58.22 to 93.62 VH after 10 wt% addition. The corrosion rate increases with increased content of SPFA, the concentration of HCl and temperature. The least corrosion rate of 0.0272 mpy was observed for the LM26 Al alloy in 0.5 M after 24 h while the highest corrosion rate of 0.8511 mpy was recorded for LM26 Al/10 wt% SPFA in 1.5 M HCl acid after 120 h. The SEM image of corroded samples revealed an increased number of pits with increased SPFA content.Research limitations/implicationsThe work is limited to SPFA up to 10 wt% as reinforcement in LM26 Al alloy, the use of HCl as corrosion medium, temperatures in the range of 303–333 K, and a weight loss method were used to evaluate the corrosion rate.Originality/valueThe corrosion rate was determined for LM26 Al/SPFA composites with various amounts of SPFA in 0.5, 1.0 and 1.5 M HCl at 303, 318 and 333 K and compared with the matrix alloy.
目的通过研究糖棕榈纤维灰(SPFA)增强LM26铝/合金复合材料的硬度和腐蚀速率,在2 wt%的范围内改变SPFA从0 ~ 10 wt%。本文旨在对上述问题进行探讨。设计/方法/方法采用搅拌铸造法制备复合材料,采用维氏硬度试验机测定复合材料的硬度,通过失重法测定复合材料在0.5、1.0和1.5 M盐酸(HCl)中分别在303、318和333 K温度下浸泡120 h的腐蚀速率。通过扫描电子显微镜(SEM)观察复合材料在HCl浸泡前后的形貌。结果SPFA的加入使合金的硬度从58.22提高到93.62 VH(添加量为10 wt%)。腐蚀速率随SPFA含量、HCl浓度和温度的增加而增加。在1.5 M盐酸中,LM26 Al/10 wt% SPFA在24 h后0.5 M的腐蚀速率最小,为0.0272 mpy,而在120 h后,LM26 Al/10 wt% SPFA的腐蚀速率最高,为0.8511 mpy。研究局限/意义:本研究仅限于在LM26铝合金中添加高达10 wt%的SPFA作为增强剂,使用HCl作为腐蚀介质,温度范围为303-333 K,并使用失重法评估腐蚀速率。测定了不同SPFA含量的LM26 Al/SPFA复合材料在HCl浓度为0.5、1.0和1.5 M,温度为303、318和333 K时的腐蚀速率,并与基体合金进行了比较。
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引用次数: 0
Computational modeling and simulations for predicting the nonlinear responses of reinforced concrete beams 钢筋混凝土梁非线性响应预测的计算建模与仿真
IF 2 4区 材料科学 Q1 Mathematics Pub Date : 2023-05-22 DOI: 10.1108/mmms-09-2022-0193
Pandimani Pandimani
PurposeThe ultimate capacity and ductility behavior of a reinforced concrete (RC) beam generally depends on its constituent material properties. This study aims to use ANSYS to accentuate the nonlinear parametric finite element (FE) simulations of RC sections under monotonic loading.Design/methodology/approachThe concrete matrix and steel reinforcement are the primary constituent materials of RC beams. The material properties such as tensile reinforcement area, tensile bars yield strength, concrete compressive strength and strain rate in tensile reinforcement at nominal strength have significantly influenced the ultimate response of RC beams. Therefore, these intensive parameters are considered in this study to ascertain their effect on the RC beam's ultimate behavior. The nonlinear response up to the ultimate load capacity and the crack evolutions of RC beams are predicted efficiently.FindingsThe parametric study reveals that increasing the tensile steel reinforcements (from Ast = 213–857 mm2) significantly improves the ultimate load capacity by 229% and yield deflections by 20%. However, it declines the ultimate deflection by 47% and ductility by 56% substantially. Varying the strain limit (?tn = 0.010–0.0015) of tensile reinforcement has proficiently increased the ultimate load-resisting capacity by 20%, whereas the ductility declined by 62%. When the concrete strength increases (from fck = 25–65 MPa), the cracking load increases profoundly by 51%, whereas the ultimate capacity has found an insignificant effect.Originality/valueThe load-deflection response plots extracted from the proposed numerical model exhibit satisfactory accuracy (less than 9% deviation) against the experimental curves available in the literature, which emphasizes the proficiency of the proposed FE model.
目的钢筋混凝土梁的极限承载力和延性通常取决于其组成材料的特性。本研究旨在利用ANSYS来强调钢筋混凝土截面在单调荷载下的非线性参数有限元模拟。设计/方法/方法混凝土基体和钢筋是钢筋混凝土梁的主要组成材料。受拉钢筋面积、受拉钢筋屈服强度、混凝土抗压强度和标称强度下受拉钢筋的应变速率等材料特性对RC梁的极限响应有显著影响。因此,本研究考虑了这些密集参数,以确定它们对RC梁极限性能的影响。有效地预测了钢筋混凝土梁在极限承载力下的非线性响应和裂缝演化。结果参数研究表明,增加受拉钢筋(Ast=213-857 mm2)可显著提高极限承载力229%和屈服挠度20%。然而,它大大降低了47%的极限挠度和56%的延性。改变受拉钢筋的应变极限(?tn=0.010–0.0015)可使极限承载力提高20%,而延性下降62%。当混凝土强度增加(从fck=25–65 MPa)时,开裂荷载大幅增加51%,而极限承载力的影响不大。原创性/价值从所提出的数值模型中提取的载荷-挠度响应图与文献中的实验曲线相比显示出令人满意的准确性(偏差小于9%),这强调了所提出的有限元模型的熟练程度。
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引用次数: 1
Transient analysis of variable thickness multi-directional functionally graded plates using isogeometric analysis 变厚度多向功能梯度板的瞬态分析
IF 2 4区 材料科学 Q1 Mathematics Pub Date : 2023-05-16 DOI: 10.1108/mmms-12-2022-0283
Minh Thi Tran, Son Thai
PurposeThe main objective of this study is to develop a numerical model based on Isogeometric Analysis to study the dynamic behavior of multi-directional functionally graded plates with variable thickness.Design/methodology/approachA numerical study was conducted on the dynamic behavior of multi-directional functionally graded plates. Rectangular and circular plates with variable thickness are taken into investigation. The third-order shear deformation plate theory of Reddy is used to describe the displacement field, while the equation of motion is developed based on the Hamilton's principle. Isogeometric Analysis approach is employed as a discretization tool to develop the system equation, where NURBS basis functions are used. The famous Newmark method is used to solve time-dependent problems.FindingsThe results obtained from this study indicated that the thickness gradation has a more considerable effect than in-plane variation of materials in MFGM plates. Additionally, the influence of the damping factor is observed to affect the vibration amplitude of the plate. The results obtained from this study could be used for future investigations, where the viscous elasticity and other dynamic factors are considered.Originality/valueAlthough there have been a number of studies in the literature devoted to analyzing the linear static bending and free vibration of FGM and MFGM plates with variable thickness, the study on dynamic response of FGM and MFGM plate is still limited. Therefore, this study is dedicated to the investigation of the dynamic behavior of multi-directional functionally graded plates.
目的建立基于等几何分析的多向变厚度功能梯度板动力学行为数值模型。设计/方法/方法对多向功能梯度板的动力特性进行了数值研究。以变厚矩形板和变厚圆形板为研究对象。采用Reddy的三阶剪切变形板理论来描述位移场,并根据Hamilton原理建立了运动方程。采用等几何分析方法作为离散化工具建立系统方程,其中采用NURBS基函数。著名的纽马克方法被用来解决时变问题。研究结果表明,厚度梯度比材料面内变化的影响更大。此外,还观察到阻尼系数对板的振动幅值的影响。本研究结果可为今后考虑粘弹性和其他动力因素的研究提供参考。虽然文献中已有大量研究对变厚度FGM和MFGM板的线性静态弯曲和自由振动进行了分析,但对FGM和MFGM板的动态响应的研究仍然有限。因此,本研究致力于多向功能梯度板的动力行为研究。
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引用次数: 1
Synthesis of an efficient phosphorus and triazine ring-containing reactive flame retardant for epoxy resin 高效含磷三嗪环环氧树脂反应性阻燃剂的合成
IF 2 4区 材料科学 Q1 Mathematics Pub Date : 2023-05-15 DOI: 10.1108/mmms-11-2022-0259
Fan Yang, Jihui Wang, Changzeng Wang, Junlei Chen, A. Ding
PurposeIn order to find an appropriate method to synthesize a new high-efficiency flame retardant for epoxy resin.Design/methodology/approachIn this work, a flame retardant with heterocyclic groups, HOMP, was acquired after removing the obstacle from triazines which was not readily soluble. The molecular structure, thermal and flame retardant properties were fully characterized and analyzed. Also, the mechanism was researched through multi-methodologies. As well, the authors evaluated the effects of HOMP on mechanical properties.FindingsThe results suggested that HOMP helped extinguish the combustion of specimens and could reach an LOI value of 29.2% and the V0 level in the UL-94 test with a phosphorus content of only 0.6wt%. With respect to the mechanism, HOMP was a gas-phase flame retardant and helped generate a thicker carbon protective coating. However, for the mechanical properties, the addition of HOMP enhanced the compressibility, while the tensile strength decreased significantly.Originality/valueThe approach not only simplified the operations but also obtained HOMP with excellent flame retardant properties.
目的寻找一种合适的合成新型高效环氧树脂阻燃剂的方法。设计/方法学/方法在本研究中,在去除难溶的三嗪的阻碍后,获得了一种具有杂环基团的阻燃剂HOMP。对其分子结构、热性能和阻燃性能进行了全面表征和分析。并运用多种方法对其机理进行了研究。此外,作者还评估了HOMP对机械性能的影响。结果表明,在磷含量仅为0.6wt%的情况下,HOMP对试样的燃烧有一定的抑制作用,在UL-94试验中LOI值可达29.2%,V0水平可达0.6wt%。就机理而言,HOMP是一种气相阻燃剂,有助于生成更厚的碳保护涂层。但在力学性能方面,加入HOMP后压缩性能有所提高,拉伸强度明显下降。该方法不仅简化了操作,而且获得了阻燃性能优良的HOMP。
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引用次数: 1
Assessment of the effect of straw lignin-based synthetic resin as a modifier on the rheological properties of asphalt binder towards better utilization of straw biomass 评价秸秆木质素基合成树脂作为改性剂对沥青粘结剂流变特性的影响,以更好地利用秸秆生物质
IF 2 4区 材料科学 Q1 Mathematics Pub Date : 2023-05-15 DOI: 10.1108/mmms-09-2022-0179
Yiming Li, Chenyang Lv
PurposeTo extend the reuse method and rate of straw biomass, this paper investigated the effect of lignin synthetic phenolic resin (LPF) on the rheological properties of asphalt binder.Design/methodology/approachFour LPFs with 25%, 50%, 75% and 100% substitution rates were prepared by replacing phenol with lignin in synthetic resins and using it as a modifier to prepare a bio-asphalt binder. Temperature sweep tests were conducted to evaluate aging resistance and temperature sensitivity of the bio-asphalt binder. The rutting resistance of the bio-asphalt binder was evaluated by frequency sweeps and multiple stress creep recovery (MSCR) test. Linear amplitude sweep (LAS) tests were conducted to evaluate the fatigue resistance of the bio-asphalt binder. A master curve was constructed to further analyze the rheological properties of the bio-asphalt binder at different frequencies. The low-temperature cracking resistance of the binder was evaluated by G-R parameters, critical temperatures and ΔTc. Fourier transform infrared spectroscopy (FTIR) was performed to investigate the changes in the functional groups of the binder before and after aging.FindingsThe results indicated that adding LPF could improve the high-temperature rutting resistance, fatigue resistance, aging resistance of asphalt and the binders are less affected by temperature. Additionally, LPF slightly prohibited the low-temperature performance of the asphalt binder, which, however, was significantly lower than the base asphalt degradation during aging. Compared with base asphalt binders, the bio-asphalt binder showed no new absorption peaks generated after adding LPF, identifying that the improved asphalt binder performance by LPF was a mainly physical modification.Originality/valueThe main objective of this paper is to further improve the substitution rate (i.e. the mass substitution ratio of lignin to phenol) of lignin and broaden the application of biomass resins, thus realizing resource sustainability.
目的研究木质素合成酚醛树脂(LPF)对沥青粘结剂流变学性能的影响,以扩大秸秆生物质的再利用方式和利用率。设计/方法/途径用木质素代替合成树脂中的苯酚,制备了四种取代率分别为25%、50%、75%和100%的生物沥青粘合剂。通过温度扫描试验对生物沥青粘结剂的抗老化性能和温度敏感性进行了评价。采用频率扫描和多重应力蠕变恢复(MSCR)试验对生物沥青粘结剂的抗车辙性能进行了评价。采用线性振幅扫描(LAS)试验对生物沥青粘结剂的抗疲劳性能进行了评价。构建了主曲线,进一步分析了不同频率下生物沥青粘结剂的流变特性。通过G-R参数、临界温度和ΔTc对粘结剂的低温抗裂性能进行了评价。利用傅里叶变换红外光谱(FTIR)研究了老化前后粘结剂官能团的变化。结果表明:掺加LPF可提高沥青的耐高温车辙性、耐疲劳性、耐老化性,且受温度影响较小;此外,LPF略微抑制了沥青粘结剂的低温性能,但明显低于基础沥青老化过程中的降解。与基础沥青粘结剂相比,生物沥青粘结剂在加入LPF后没有产生新的吸收峰,说明LPF对沥青粘结剂性能的改善主要是物理改性。本文的主要目的是进一步提高木质素的替代率(即木质素对苯酚的质量替代比),扩大生物质树脂的应用范围,从而实现资源的可持续性。
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引用次数: 0
Polymer presence in boundary layer flow and heat transfer of dusty fluid over a stretching surface 聚合物的存在在边界层流动和热传递的灰尘流体在拉伸表面
IF 2 4区 材料科学 Q1 Mathematics Pub Date : 2023-05-12 DOI: 10.1108/mmms-09-2022-0167
M. Athar, Adeel Ahmad, Yasir Khan
PurposeTo explore the fusion of dust particles and of polymers in a viscous liquid is the main purpose of this article. Newtonian fluid as a base fluid is considered and the mutual presence of polymers and dusty bodies is investigated. It discusses the steady laminar flow and heat transportation of a polymeric dusty liquid induced by a uniformly heated, penetrable and stretchable surface inside the boundary layer.Design/methodology/approachThe mathematical system incorporates separate equations of energy and momentum for dusty bodies and for fluid. The classical Oldroyd-B model is chosen for exploring polymer presence. For the fluid phase, this model adds another stress to the conservation law of momentum. Appropriate similarity variables are introduced to transform the system of partial differential equations (PDEs) into a system of nonlinear ordinary differential equations (ODEs). The problem is solved by introducing a numerical iterative procedure which turned out to be fastly converging.FindingsExpeditious changes inside the boundary layer cause polymers to deform. No changes outside the boundary layer are noticed on account of polymer stretching. The dependence of heat transfer rate and skin friction on the parameter of polymer concentration and Weissenberg number is analyzed and displayed graphically against interaction parameters for temperature and velocity, dust particles’ mass concentration, Eckert and Prandtl numbers. Combining effects of polymers and dust particles cause skin friction to decrease and heat transfer rate to increase. Increasing values of interaction parameter for velocity, dust particles’ mass concentration and Eckert number reduces the drag coefficient and local Nusselt number. On the other hand, the Prandtl number and interaction parameter of temperature magnify the heat flux at the wall.Research limitations/implicationsThis article studies the infinite extensibility of polymers. FENE and FENE-P models can be used to investigate the polymer presence in dusty fluids in the future.Originality/valueIn this article, the authors’ aim is to study the combined presence of polymers and dusty bodies. Keeping the existing literature in view, this type of fusion is not studied yet. Polymer inclusion in a viscous dusty fluid is studied and the behavior of fluid flow and heat transportation is investigated within the boundary layer over a permeable linearly stretching sheet.
目的探索粘性液体中尘埃粒子与聚合物的融合是本文的主要目的。考虑了牛顿流体作为基础流体,研究了聚合物与尘埃体的相互存在。讨论了由边界层内均匀加热、可穿透和可拉伸的表面引起的聚合物含尘液体的稳定层流和热传输。设计/方法论/方法数学系统包含了尘埃物体和流体的能量和动量的单独方程。选择经典的Oldroyd-B模型来探索聚合物的存在。对于流体相,该模型为动量守恒定律增加了另一个应力。引入适当的相似变量将偏微分方程组转化为非线性常微分方程组。该问题是通过引入一个数值迭代程序来解决的,该程序被证明是快速收敛的。发现边界层内部的快速变化会导致聚合物变形。由于聚合物拉伸,没有注意到边界层之外的变化。分析了传热率和表面摩擦对聚合物浓度和Weissenberg数参数的依赖性,并将其与温度和速度、尘粒质量浓度、Eckert和Prandtl数的相互作用参数进行了图形显示。聚合物和灰尘颗粒的共同作用导致皮肤摩擦减少,传热速率增加。增加速度、尘粒质量浓度和埃克特数的相互作用参数值会降低阻力系数和局部努塞尔数。另一方面,温度的普朗特数和相互作用参数放大了壁面的热通量。研究局限性/含义本文研究聚合物的无限延展性。FENE和FENE-P模型可用于研究未来含尘流体中聚合物的存在。原创性/价值在这篇文章中,作者的目的是研究聚合物和多尘物体的共同存在。从现有文献的角度来看,这种类型的融合尚未得到研究。研究了粘性含尘流体中的聚合物包裹体,并研究了可渗透线性拉伸薄板边界层内的流体流动和热传输行为。
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引用次数: 0
Experimental and finite element analyses on the vibration behavior of 3D-printed PET-G tapered beams with fused filament fabrication 熔丝制造3d打印PET-G锥形梁振动特性的实验和有限元分析
IF 2 4区 材料科学 Q1 Mathematics Pub Date : 2023-05-08 DOI: 10.1108/mmms-11-2022-0265
Berkay Ergene, G. Atlıhan, A. Pınar
PurposeThis study aims to reveal the influences of three-dimensional (3D) printing parameters such as layer heights (0.1 mm, 0.2 mm and 0.4 mm), infill rates (40, 70 and 100%) and geometrical property as tapered angle (0, 0.25 and 0.50) on vibrational behavior of 3D-printed polyethylene terephthalate glycol (PET-G) tapered beams with fused filament fabrication (FFF) method.Design/methodology/approachIn this performance, all test specimens were modeled in AutoCAD 2020 software and then 3D-printed by FFF. The effects of printing parameters on the natural frequencies of 3D-printed PET-G beams with different tapered angles were also analyzed experimentally, and numerically (finite element analysis) via Ansys APDL 16 program. In addition to vibrational properties, tensile strength, elasticity modulus, hardness, and surface roughness of the 3D-printed PET-G parts were examined.FindingsIt can be stated that average surface roughness values ranged between 1.63 and 6.91 µm. In addition, the highest and lowest hardness values were found as 68.6 and 58.4 Shore D. Tensile strength and elasticity modulus increased with the increase of infill rate and decrease of the layer height. In conclusion, natural frequency of the 3D-printed PET-G beams went up with higher infill rate values though no critical change was observed for layer height and a change in tapered angle fluctuated the natural frequency values significantly.Research limitations/implicationsThe influence of printing parameters on the vibrational properties of 3D-printed PET-G beams with different tapered angles was carried out and the determination of these effects is quite important. On the other hand, with the addition of glass or carbon fiber reinforcements to the PET-G filaments, the material and vibrational properties of the parts can be examined in future works.Practical implicationsAs a result of this study, it was shown that natural frequencies of the 3D-printed tapered beams from PET-G material can be predicted via finite element analysis after obtaining material data with the help of mechanical/physical tests. In addition, the outcome of this study can be used as a reference during the design of parts that are subjected to vibration such as turbine blades, drone arms, propellers, orthopedic implants, scaffolds and gears.Social implicationsIt is believed that determination of the effect of the most used 3D printing parameters (layer height and infill rate) and geometrical property of tapered angle on natural frequencies of the 3D-printed parts will be very useful for researchers and engineers; especially when the importance of resonance is known well.Originality/valueWhen the literature efforts are scanned in depth, it can be seen that there are many studies about mechanical or wear properties of the 3D-printed parts. However, this is the first study which focuses on the influences of the both 3D printing parameters and tapered angles on the vibrational behaviors of the tapered PET-G beams p
本研究旨在揭示层高(0.1 mm、0.2 mm和0.4 mm)、填充率(40%、70%和100%)和锥度几何特性(0、0.25和0.50)等三维(3D)打印参数对熔融长丝制造(FFF)方法3D打印聚对苯二甲酸乙二醇酯(PET-G)锥度梁振动行为的影响。设计/方法/方法在本次表演中,所有的试件都是在AutoCAD 2020软件中建模,然后由FFF进行3d打印。实验分析了打印参数对不同锥度的3d打印PET-G梁固有频率的影响,并通过Ansys APDL 16程序进行了数值模拟(有限元分析)。除了振动性能外,还测试了3d打印PET-G部件的抗拉强度、弹性模量、硬度和表面粗糙度。平均表面粗糙度值在1.63 ~ 6.91µm之间。硬度最大值为68.6,最小值为58.4 Shore d。拉伸强度和弹性模量随填充率的增加和层高的降低而增大。综上所述,3d打印PET-G梁的固有频率随着填充率的增加而增加,但层高没有发生临界变化,而锥度角的变化会显著影响固有频率值。研究局限性/意义研究了打印参数对不同锥度的3d打印PET-G梁振动特性的影响,确定这些影响是非常重要的。另一方面,通过在PET-G长丝中添加玻璃或碳纤维增强,可以在未来的工作中检查零件的材料和振动性能。实际意义本研究结果表明,在机械/物理测试的帮助下获得材料数据后,可以通过有限元分析预测PET-G材料3d打印锥形梁的固有频率。此外,本研究结果可为涡轮叶片、无人机臂、螺旋桨、骨科植入物、支架、齿轮等易受振动部件的设计提供参考。人们相信,确定最常用的3D打印参数(层高和填充率)和锥度几何特性对3D打印部件固有频率的影响将对研究人员和工程师非常有用;尤其是当共振的重要性众所周知的时候。原创性/价值当深入扫描文献努力时,可以看到有很多关于3d打印部件的力学或磨损性能的研究。然而,这是第一次研究3D打印参数和锥度角对基于材料挤压FFF法生产的锥度PET-G梁振动行为的影响。此外,所得到的实验结果也得到了有限元分析的支持。
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引用次数: 0
Optimization of reinforced concrete columns with variable circular cross-section hollowed using the criterion of instability and mechanical strength 基于失稳和力学强度准则的变圆截面空心钢筋混凝土柱优化设计
IF 2 4区 材料科学 Q1 Mathematics Pub Date : 2023-05-08 DOI: 10.1108/mmms-01-2023-0017
Lucas Willian Aguiar Mattias, L. J. Araujo
PurposeThis study aims to optimize the structural design of reinforced concrete columns with variable hollow circular sections.Design/methodology/approachThe columns were optimized according to the criteria of instability (buckling) and mechanical strength (compression and/or tensile strength). To perform the optimizations, routines are developed in Python using the penalty and sequential linearization programming (SLP) function methods to optimize the elements satisfying the buckling and stress criteria.FindingsAt the end of the optimization process, the optimal section is obtained for the example of a circular column with a variable section, this section has an average radius of 5% smaller than that initially defined.Originality/valueThe theoretical basis for column optimization and the structuring of an algorithm in Python language for the computational resolution of these problems are presented in a didactic way, as well as the comparative efficiency of the methods.
目的本研究旨在优化变截面空心圆截面钢筋混凝土柱的结构设计。设计/方法/方法根据不稳定性(屈曲)和机械强度(压缩和/或拉伸强度)标准对柱进行优化。为了执行优化,在Python中使用惩罚和顺序线性化编程(SLP)函数方法开发例程,以优化满足屈曲和应力标准的单元。发现在优化过程结束时,获得了具有可变截面的圆柱的最佳截面,该截面的平均半径比最初定义的半径小5%。原创性/价值以教学的方式介绍了列优化的理论基础和Python语言中用于计算解决这些问题的算法的结构,以及这些方法的相对效率。
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引用次数: 0
Identification of multiple nonlinear lap joints using instantaneous power flow balance 利用瞬时潮流平衡识别多个非线性搭接接头
IF 2 4区 材料科学 Q1 Mathematics Pub Date : 2023-04-18 DOI: 10.1108/mmms-10-2022-0212
Dr. Anish R, K. Shankar
PurposeThe purpose of this paper is to apply the novel instantaneous power flow balance (IPFB)-based identification strategy to a specific practical situation like nonlinear lap joints having single and double bolts. The paper also investigates the identification performance of the proposed power flow method over conventional acceleration-matching (AM) methods and other methods in the literature for nonlinear identification.Design/methodology/approachA parametric model of the joint assembly formulated using generic beam element is used for numerically simulating the experimental response under sinusoidal excitations. The proposed method uses the concept of substructure IPFB criteria, whereby the algebraic sum of power flow components within a substructure is equal to zero, for the formulation of an objective function. The joint parameter identification problem was treated as an inverse formulation by minimizing the objective function using the Particle Swarm Optimization (PSO) algorithm, with the unknown parameters as the optimization variables.FindingsThe errors associated with identified numerical results through the instantaneous power flow approach have been compared with the conventional AM method using the same model and are found to be more accurate. The outcome of the proposed method is also compared with other nonlinear time-domain structural identification (SI) methods from the literature to show the acceptability of the results.Originality/valueIn this paper, the concept of IPFB-based identification method was extended to a more specific practical application of nonlinear joints which is not reported in the literature. Identification studies were carried out for both single-bolted and double-bolted lap joints with noise-free and noise-contamination cases. In the current study, only the zone of interest (substructure) needs to be modelled, thus reducing computational complexity, and only interface sensors are required in this method. If the force application point is outside the substructure, there is no need to measure the forcing response also.
目的将基于瞬时潮流平衡(IPFB)的新型识别策略应用于具有单螺栓和双螺栓的非线性搭接节点等具体实际情况。本文还研究了所提出的潮流识别方法相对于传统的加速度匹配(AM)方法和其他非线性识别方法的识别性能。设计/方法/方法采用通用梁单元建立了关节组件的参数化模型,对正弦激励下的实验响应进行了数值模拟。所提出的方法使用子结构IPFB准则的概念,即子结构内功率流分量的代数和等于零,用于目标函数的表述。采用粒子群优化(PSO)算法,以未知参数为优化变量,通过最小化目标函数,将联合参数辨识问题视为一个逆表达式。研究结果通过对瞬时潮流法与常规调幅法在相同模型下辨识出的数值结果的误差进行了比较,发现其精度更高。并将该方法的结果与文献中其他非线性时域结构识别方法进行了比较,以表明结果的可接受性。本文将基于ipfb的识别方法的概念扩展到文献中未见报道的更具体的非线性关节的实际应用中。在无噪声和噪声污染情况下,对单螺栓和双螺栓搭接进行了识别研究。在目前的研究中,只需要对感兴趣的区域(子结构)进行建模,从而降低了计算复杂度,并且该方法只需要界面传感器。如果施力点在子结构外,则不需要测量力响应。
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引用次数: 0
An investigation on the cyclic deformation and service life of a reusable liquid rocket engine thrust chamber wall 可重复使用液体火箭发动机推力室壁循环变形及使用寿命研究
IF 2 4区 材料科学 Q1 Mathematics Pub Date : 2023-04-03 DOI: 10.1108/mmms-02-2023-0044
Yushan Gao, Ping Zhang, S. Huo
PurposeRegeneratively cooled thrust chamber is a key component of reusable liquid rocket engines. Subjected to cyclic thermal-mechanical loadings, its failure can seriously affect the service life of engines. QCr0.8 copper alloy is widely used in thrust chamber walls due to its excellent thermal conductivity, and its mechanical and fatigue properties are essential for the evaluation of thrust chamber life. This paper contributes to the understanding of the damage mechanism and material selection of regeneratively cooled thrust chambers for reusable liquid rocket engines.Design/methodology/approachIn this paper, tensile and low-cycle fatigue (LCF) tests were conducted for QCr0.8 alloy, and a Chaboche combined hardening model was established to describe the elastic-plastic behavior of QCr0.8 at different temperatures and strain levels. In addition, an LCF life prediction model was established based on the Manson–Coffin formula. The reliability and accuracy of models were then verified by simulations in ABAQUS. Finally, the service life was evaluated for a regenerative cooling thrust chamber, under the condition of cyclic startup and shutdown.FindingsIn this paper, a Chaboche combined hardening model was established to describe the elastoplastic behavior of QCr0.8 alloy at different temperatures and strain levels through LCF experiments. The parameters of the fitted Chaboche model were simulated in ABAQUS, and the simulation results were compared with the experimental results. The results show that the model has high reliability and accuracy in characterizing the viscoplastic behavior of QCr0.8 alloy.Originality/value(1)The parameters of a Chaboche combined hardening constitutive model and LCF life equation were optimized by tensile and strain-controlled fatigue tests of QCr0.8 copper alloy. (2) Based on the Manson–Coffin formula, the reliability and accuracy of constitutive model were then verified by simulations in ABAQUS. (3)Thermal-mechanical analysis was carried out for regeneratively cooled thrust chamber wall of a reusable liquid rocket engine, and the service life considering LCF, creep and ratcheting damage was analyzed.
目的再生冷却推力室是可重复使用液体火箭发动机的关键部件。在循环热机械载荷作用下,其失效会严重影响发动机的使用寿命。QCr0.8铜合金由于其优异的导热性而被广泛应用于推力室壁,其机械性能和疲劳性能对评估推力室寿命至关重要。本文有助于理解可重复使用液体火箭发动机再生冷却推力室的损伤机理和材料选择。设计/方法/方法本文对QCr0.8合金进行了拉伸和低周疲劳(LCF)试验,并建立了Chaboche联合硬化模型来描述QCr0.8在不同温度和应变水平下的弹塑性行为。此外,基于Manson–Coffin公式建立了LCF寿命预测模型。然后在ABAQUS中通过仿真验证了模型的可靠性和准确性。最后,对再生冷却推力室在循环启停条件下的使用寿命进行了评估。本文通过LCF实验,建立了一个Chaboche复合硬化模型来描述QCr0.8合金在不同温度和应变水平下的弹塑性行为。在ABAQUS中对拟合的Chaboche模型的参数进行了仿真,并将仿真结果与实验结果进行了比较。结果表明,该模型在表征QCr0.8合金粘塑性行为方面具有较高的可靠性和准确性。独创性/数值(1)通过QCr0.8铜合金的拉伸和应变控制疲劳试验,优化了Chaboche联合硬化本构模型和LCF寿命方程的参数。(2) 基于Manson–Coffin公式,通过ABAQUS仿真验证了本构模型的可靠性和准确性。(3) 对可重复使用液体火箭发动机再生冷却推力室壁进行了热力学分析,分析了考虑LCF、蠕变和棘轮损伤的使用寿命。
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引用次数: 0
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Multidiscipline Modeling in Materials and Structures
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