Applications in engineering science最新文献_第7页

Optimization of box girder bridge widening techniques: Reinforced Rib vs. Strut solutions 箱梁桥加宽技术的优化：加强肋与支撑解决方案

IF 2.2 Q2 ENGINEERING, MULTIDISCIPLINARY

Applications in engineering science

Pub Date : 2025-05-10 DOI: 10.1016/j.apples.2025.100228

Dac-Duc Nguyen

Optimizing existing bridge infrastructure is crucial with the increasing demands of urbanization and traffic. This study investigates methods to enhance the structural performance of single-cell box girder bridges by implementing reinforcing ribs and struts. Focusing on the Tan De Bridge in Thai Binh, Vietnam - a cantilever bridge using a single-cell box girder, the research evaluates load-bearing capacity, deflection, and torsional resistance across three cross-sectional designs: the original single box girder, a box girder with transverse stiffening ribs, and a strutted box girder. The study uses ANSYS Mechanical software for three-dimensional modeling and simulation to examine natural vibration frequencies, stress distribution, and deflection under HL93 loading conditions. ANSYS Mechanical's finite element analysis capabilities allow for a detailed assessment of local and global structural behaviors, providing insights into the different cross-sections' dynamic stability and stress responses. Results indicate that reinforcing ribs and struts significantly improve the bridge's structural integrity. Reinforcing ribs offer superior cross-bridge stiffness, while struts provide optimal stress distribution and reduce flange instability. The study highlights the exceptional flexural resistance of the strutted box girder under eccentric loading, underscoring its potential to optimize bridge design for urban infrastructure demands while ensuring robust structural performance. These findings emphasize the effectiveness of these methods in meeting urban infrastructure needs by facilitating the expansion of bridge width while preserving structural stability and performance.

随着城市化和交通需求的不断增长，优化现有桥梁基础设施至关重要。本文研究了通过加强肋和支来提高单格箱梁桥结构性能的方法。以越南Thai Binh的Tan De大桥为研究对象——一座使用单单元箱梁的悬臂桥，研究评估了三种截面设计的承重能力、挠度和抗扭能力：原始的单箱梁、带有横向加劲肋的箱梁和有支撑的箱梁。本研究采用ANSYS机械软件进行三维建模和仿真，研究了HL93加载条件下的固有振动频率、应力分布和挠度。ANSYS机械有限单元分析功能允许对局部和整体结构行为进行详细评估，提供对不同截面的动态稳定性和应力响应的见解。结果表明，加强肋、支结构可以显著提高桥梁的结构完整性。加强肋提供卓越的跨桥刚度，而支撑提供最佳的应力分布和减少法兰不稳定。该研究强调了支撑箱梁在偏心荷载下的特殊抗弯能力，强调了其在确保坚固结构性能的同时优化城市基础设施需求桥梁设计的潜力。这些发现强调了这些方法在满足城市基础设施需求方面的有效性，通过促进桥梁宽度的扩大，同时保持结构的稳定性和性能。

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引用次数: 0

Modeling and performance analysis of a pneumatic steering system to enhance maneuverability in T-55 Armored Vehicles 提高T-55装甲车机动性能的气动转向系统建模与性能分析

IF 2.2 Q2 ENGINEERING, MULTIDISCIPLINARY

Applications in engineering science

Pub Date : 2025-05-10 DOI: 10.1016/j.apples.2025.100232

Lemma Nigussie, Kumlachew Yeneneh

This study presents the development and analysis of a pneumatic steering mechanism for the T-55 tank, addressing challenges inherent in traditional manual systems. These systems require excessive physical effort due to high resistance in linkages, leading to operator fatigue and reduced maneuverability. The proposed mechanism integrates a pneumatic cylinder and “rocker arm to convert linear motion into precise rotational control, enhancing steering performance and driver comfort. The design leverages compressed air as a lightweight, safe, and responsive medium, ensuring adaptability to diverse operational conditions. Structural analysis via finite element methods (FEA) confirmed the mechanism’s durability, with the rocker arm exhibiting a maximum von Mises stress of 46 MPa, well below the material’s yield strength of 200 MPa. Fatigue analysis further demonstrated the mechanism’s capacity to endure over one million load cycles, ensuring long-term reliability. Dynamic simulations using MSC.ADAMS validated the system’s performance. The piston stroke, ranging from 0 to 150 mm, allowed precise control of steering linkages. Motion analysis confirmed a free travel distance of 132.5 mm, aligning with practical requirements for T-55 steering systems. The pneumatic system also reduced operator effort by over 50% compared to manual systems, significantly improving operational efficiency. Compared to traditional systems, the pneumatic mechanism enhances maneuverability, enabling smooth directional changes in challenging terrains while reducing driver strain. Its modular design facilitates seamless integration with existing tank frameworks, minimizing modifications. This work demonstrates the potential of pneumatic systems to modernize tracked vehicle steering mechanisms, providing enhanced agility, reliability, and safety. The findings ensure that tanks like the T-55 remain highly effective in modern combat scenarios.

本研究提出了T-55坦克气动转向机构的开发和分析，解决了传统手动系统固有的挑战。由于连杆的高阻力，这些系统需要过多的体力，导致操作人员疲劳和可操作性降低。所提出的机构集成了一个气缸和摇臂，将直线运动转化为精确的旋转控制，提高了转向性能和驾驶舒适性。该设计充分利用了压缩空气作为一种轻便、安全、反应灵敏的介质，确保了对各种操作条件的适应性。通过有限元方法（FEA）进行的结构分析证实了该机构的耐久性，摇臂的最大冯米塞斯应力为46 MPa，远低于材料的200 MPa屈服强度。疲劳分析进一步证明了该机构承受超过一百万次载荷循环的能力，确保了长期的可靠性。动态模拟使用MSC。ADAMS验证了系统的性能。活塞行程范围从0到150毫米，可以精确控制转向连杆。运动分析证实自由移动距离为132.5毫米，符合T-55转向系统的实际要求。与手动系统相比，气动系统还减少了操作人员50%以上的工作量，显著提高了操作效率。与传统系统相比，气动机构提高了机动性，在具有挑战性的地形中实现了平稳的方向变化，同时减少了驾驶员的压力。其模块化设计有助于与现有储罐框架无缝集成，最大限度地减少修改。这项工作证明了气动系统在现代化履带式车辆转向机制方面的潜力，提供了更高的灵活性、可靠性和安全性。这些发现确保了像T-55这样的坦克在现代战斗场景中仍然非常有效。

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引用次数: 0

On mesh refinement procedures for polygonal virtual elements 多边形虚元的网格细化方法

IF 2.2 Q2 ENGINEERING, MULTIDISCIPLINARY

Applications in engineering science

Pub Date : 2025-05-09 DOI: 10.1016/j.apples.2025.100222

Daniel van Huyssteen , Felipe Lopez Rivarola , Guillermo Etse , Paul Steinmann

This work concerns the application of adaptive refinement procedures to meshes of unstructured polygonal virtual elements. Adaptive refinement indicators previously proposed by the authors, and investigated for meshes of structured quadrilateral elements, are studied in more general applications. Specifically, the performance of the indicators is studied on unstructured polygonal meshes, and for cases of compressible and nearly-incompressible materials. Localized refinement of unstructured meshes is a non-trivial task as the algorithm must be robust, and must accommodate a wide variety of geometric possibilities. To this end, an element refinement algorithm is presented based on strategic seeding of Voronoi tessellations and is suitable for both structured and unstructured meshes. Furthermore, it is not known apriori whether the previously proposed refinement indicators will be reliable or effective in the presence of unstructured mesh geometries and nearly-incompressible materials. Thus, the performance of the refinement procedures is studied through a broad numerical campaign. The results demonstrate that the high degree of efficacy and efficiency previously exhibited by the adaptive procedures is also achieved in the cases of irregular unstructured/Voronoi meshes and near-incompressibility.

本工作涉及自适应细化程序在非结构化多边形虚拟元素网格中的应用。作者先前提出的自适应细化指标，以及对结构四边形单元网格的研究，在更一般的应用中进行了研究。具体来说，研究了这些指标在非结构化多边形网格、可压缩和近乎不可压缩材料情况下的性能。非结构化网格的局部细化是一项非常重要的任务，因为算法必须具有鲁棒性，并且必须适应各种各样的几何可能性。为此，提出了一种基于Voronoi细分策略播种的单元细化算法，该算法适用于结构化和非结构化网格。此外，在非结构化网格几何形状和几乎不可压缩材料存在的情况下，先前提出的细化指标是否可靠或有效尚不清楚。因此，通过广泛的数值活动研究了改进过程的性能。结果表明，在不规则非结构化/Voronoi网格和接近不可压缩的情况下，自适应程序也达到了以前所表现出的高度的有效性和效率。

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引用次数: 0

A review of vertical drill-string mathematical modelling 垂直钻柱数学建模研究进展

IF 2.2 Q2 ENGINEERING, MULTIDISCIPLINARY

Applications in engineering science

Pub Date : 2025-05-08 DOI: 10.1016/j.apples.2025.100227

Jasem M. Kamel , Asan G.A. Muthalif , Abdulazim H. Falah

This work aims to elucidate the fundamental concepts and approaches for modelling the vertical rotary drilling system and analysing drill string vibrations through a comprehensive literature review. It offers a detailed examination and critical discussion for the discrete and distributed mathematical modelling vibration along with associated boundaries conditions for low and high frequency oscillations. Additionally, this study discusses experimental models and their actual applications, highlighting their role in validating theoretical models and improving drilling performance. This study presents a thorough overview of existing literature on vertical drill string vibration problems, making it a valuable resource for researchers in the field. The study not only synthesizes existing knowledge but also seeks to guide future research efforts in addressing and mitigating the complex challenges associated with drill string vibrations.

本工作旨在通过全面的文献综述，阐明垂直旋转钻井系统建模和钻柱振动分析的基本概念和方法。它提供了一个详细的检查和关键的讨论离散和分布式数学建模振动以及相关的边界条件的低频和高频振荡。此外，本研究还讨论了实验模型及其实际应用，强调了它们在验证理论模型和提高钻井性能方面的作用。本研究对垂直钻柱振动问题的现有文献进行了全面的综述，为该领域的研究人员提供了宝贵的资源。该研究不仅综合了现有知识，还旨在指导未来的研究工作，以解决和减轻与钻柱振动相关的复杂挑战。

引用次数: 0

Optimizing active suspension systems with robust h∞ control and adaptive techniques under uncertainties 基于鲁棒h∞控制和不确定自适应技术的主动悬架系统优化

IF 2.2 Q2 ENGINEERING, MULTIDISCIPLINARY

Applications in engineering science

Pub Date : 2025-04-29 DOI: 10.1016/j.apples.2025.100225

Kumlachew Yeneneh, Menelik Walle, Tatek Mamo, Yared Yalew

This study presents a transformative approach to active suspension control through the development of a hybrid robust-adaptive framework that synergistically combines three advanced techniques: μ-synthesis enhanced H∞ control, model reference adaptation, and real-time frequency-domain optimization. The novel architecture overcomes fundamental limitations in conventional systems by simultaneously addressing (i) parametric uncertainties through structured robustness margins (μ < 1 for ±25 % variations in mass/stiffness), (ii) unstructured road disturbances via adaptive gain scheduling, and (iii) resonant vibrations using closed-loop FFT analysis with 50 ms spectral updates. The controller's dual-degree-of-freedom design introduces a breakthrough solution where the H∞ core guarantees stability while the adaptive module dynamically adjusts damping ratios and stiffness coefficients through Lyapunov-based parameter estimation, achieving 40 % faster convergence than fixed-gain alternatives. Comprehensive simulations under ISO-standardized road profiles demonstrate unprecedented performance: 87.1 % reduction in suspension travel (0.113 m to 0.015 m) and 49.3 % decrease in body acceleration (6.38m/s² to 3.73m/s²) versus passive systems, while maintaining 18 % lower energy consumption than traditional H∞ implementations. The frequency-domain optimization proves particularly effective, reducing resonant peak magnitudes by 62–75 % in the critical 1–4 Hz comfort range and 55 % at the 15 Hz wheel-hop frequency. Practical implementation advantages include compatibility with standard automotive sensors (requiring only accelerometers and displacement sensors), modest computational load (executable on 100 MHz automotive-grade processors), and self-calibrating capability that eliminates manual tuning. These advancements position the framework as an ideal solution for next-generation vehicles, with demonstrated applicability to electric platforms (through regenerative damping integration) and autonomous systems (via V2X communication-enabled predictive adaptation). The research establishes new theoretical foundations for uncertainty management in vehicle dynamics while delivering a commercially viable control strategy validated under realistic operating conditions.

本研究通过开发一种混合鲁棒自适应框架，提出了一种变革性的主动悬架控制方法，该框架协同结合了三种先进技术：μ合成增强H∞控制、模型参考自适应和实时频域优化。新架构克服了传统系统的基本限制，同时解决(i)参数不确定性，通过结构化鲁棒性裕度(μ <；1用于质量/刚度±25%的变化),（ii）通过自适应增益调度的非结构化道路干扰，以及（iii）使用50 ms频谱更新的闭环FFT分析的谐振振动。控制器的双自由度设计引入了突破性的解决方案，其中H∞核心保证稳定性，而自适应模块通过基于李雅普诺夫的参数估计动态调整阻尼比和刚度系数，实现比固定增益替代方案快40%的收敛速度。在iso标准化道路剖面下的综合模拟显示了前所未有的性能：与被动系统相比，悬架行程减少了87.1% (0.113 m至0.015 m)，车身加速度减少了49.3% （6.38m/s²至3.73m/s²），同时能耗比传统H∞系统低18%。频域优化被证明是特别有效的，在关键的1-4 Hz舒适范围内，共振峰幅度降低了62 - 75%，在15 Hz轮跳频率下，共振峰幅度降低了55%。实际实现的优势包括与标准汽车传感器的兼容性（只需要加速度计和位移传感器），适度的计算负载（可在100 MHz汽车级处理器上执行），以及消除手动调整的自校准能力。这些进步使该框架成为下一代汽车的理想解决方案，并证明了其对电动平台（通过再生阻尼集成）和自动系统（通过支持V2X通信的预测适应）的适用性。该研究为车辆动力学的不确定性管理建立了新的理论基础，同时提供了在实际操作条件下验证的商业上可行的控制策略。

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引用次数: 0

Effect of peak-to-peak amplitude at the base of crimped spiral fins on the air-side performance of crimped spiral fin-and-tube heat exchangers 卷曲螺旋翅片底部峰间振幅对卷曲螺旋翅片管换热器空气侧性能的影响

IF 2.2 Q2 ENGINEERING, MULTIDISCIPLINARY

Applications in engineering science

Pub Date : 2025-04-28 DOI: 10.1016/j.apples.2025.100226

Thawatchai Keawkamrop, Somchai Wongwises

This experimental study investigates the effect of peak-to-peak amplitude (PTPA) at the base of a crimped spiral fin (CSF) on the air-side performance of a crimped spiral fin-and-tube heat exchanger (CSFTHX) within a 3000 to 14,000 Reynolds number range. Both plain spiral fins (PSFs) and CSFs are examined. The PTPA is the main geometric parameter of interest in this study. We investigated CSFTHXs with a 19.05 mm outer tube diameter, a fin density of 5 fins per inch (equivalent to a fin pitch of 5.08 mm). The selected peak-to-peak amplitude (PTPA) values—2.5 mm (low), 3.5 mm (medium), and 5.08 mm (high)—cover a representative range commonly used in industrial applications. The results indicate that variations in the PTPA have an insignificant effect on the Colburn factor, suggesting minimal influence on heat transfer performance. However, the PTPA has a significant effect on the friction factor, with higher PTPA values resulting in increased pressure drops. The fin factor, defined as the ratio between the percentage increase in the convective heat transfer coefficient and the corresponding percentage increase in pressure drop, is used for the investigation. For the air frontal velocities above 2 m/s, the fin factor of the CSF with a PTPA of 2.50 mm is higher than those with PTPA values of 3.50 mm and 5.08 mm. This indicates better overall performance in terms of a heat transfer-to-pressure drop trade-off at lower amplitudes.

本实验研究了在3000 ~ 14000雷诺数范围内，卷曲螺旋翅片（CSF）底部的峰峰振幅（PTPA）对卷曲螺旋翅片管换热器（CSFTHX）空气侧性能的影响。对平面螺旋鳍和螺旋鳍进行了研究。PTPA是本研究的主要几何参数。我们研究的csfthx外管直径为19.05 mm，鳍密度为每英寸5个鳍（相当于鳍间距为5.08 mm）。所选的峰对峰振幅（PTPA）值- 2.5 mm（低），3.5 mm（中）和5.08 mm（高）-涵盖了工业应用中常用的代表性范围。结果表明，PTPA的变化对Colburn因子的影响不显著，表明对换热性能的影响很小。然而，PTPA对摩擦系数有显著影响，PTPA值越高，压降越大。翅片系数定义为对流换热系数增加百分比与相应的压降增加百分比之比，用于研究。在锋面速度大于2 m/s时，PTPA为2.50 mm时的尾翼系数高于PTPA为3.50 mm和5.08 mm时的尾翼系数。这表明在较低振幅下传热与压降权衡方面的整体性能更好。

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引用次数: 0

Process-induced shrinking and warping in additively manufactured polycarbonate plates 增材制造聚碳酸酯板的工艺诱导收缩和翘曲

IF 2.2 Q2 ENGINEERING, MULTIDISCIPLINARY

Applications in engineering science

Pub Date : 2025-04-27 DOI: 10.1016/j.apples.2025.100220

P. Sreejith , Albert E. Patterson , K.R. Rajagopal , Bhaskar Vajipeyajula

Most thermoplastic manufacturing processes, that do not include cutting, involves the melting and re-solidification of the raw material, which results in delamination, warpage, and shrinkage. These undesirable artifacts are introduced due to the build-up of residual stress during fabrication of the part. They not only affect the process reliability and repeatability, but also the service life and aesthetics of the final product. This is of particular concern in extrusion-based additive manufacturing of thermoplastics with relatively high melting temperatures, such as polycarbonate (PC). By controlling the process parameters, a certain degree of influence can be maintained on the multiple heating/cooling cycles and the corresponding phase transformations that induce differential shrinkage in the part. In the current study, the influence of the orientation of the fabricated part (flat and horizontal¹) on the process history, and as a result on the residual stress distribution in rectangular plates printed using fused filament fabrication (FFF) is studied. This work used a thermodynamically-consistent model previously derived for extrusion-based additive manufacturing to run simulations within ABAQUS. Corresponding experiments were conducted to validate the model, along with the error and repeatability analysis. The final dimensions of the plates measured from the experiments matched exceptionally well with the values measured from the simulations. The simulations predicted that the residual stress distribution in each orientation is extremely different. It mainly depended on the distribution of the weight fraction of the glass phase and temperature, which have significantly distinct patterns in both orientations. The simulation also predicted very different possible failure regions for the plates printed in the flat and horizontal orientations.

大多数热塑性塑料制造过程，不包括切割，涉及到原材料的熔化和再凝固，这导致分层，翘曲和收缩。由于零件制造过程中残余应力的积累，引入了这些不希望的工件。它们不仅影响工艺的可靠性和可重复性，而且影响最终产品的使用寿命和美观性。这在熔融温度相对较高的热塑性塑料（如聚碳酸酯（PC））的挤压增材制造中尤其值得关注。通过控制工艺参数，可以对多个加热/冷却循环和相应的相变保持一定程度的影响，从而导致零件的差异收缩。在当前的研究中，研究了被制件的方向（平面和水平方向）对过程历史的影响，并由此对使用熔丝制造（FFF）印刷的矩形板的残余应力分布进行了研究。这项工作使用了先前为基于挤压的增材制造导出的热力学一致模型，在ABAQUS中运行模拟。进行了相应的实验验证模型，并进行了误差和重复性分析。从实验中测量的板的最终尺寸与从模拟中测量的值非常吻合。模拟结果表明，各个方向的残余应力分布差异很大。这主要取决于玻璃相的质量分数和温度的分布，在两个方向上都有明显不同的模式。模拟还预测了在平面和水平方向上印刷的板的非常不同的可能失效区域。

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引用次数: 0

Additive manufacturing: shaping the future of the manufacturing industry – overview of trends, challenges and opportunities 增材制造：塑造制造业的未来——趋势、挑战和机遇概述

IF 2.2 Q2 ENGINEERING, MULTIDISCIPLINARY

Applications in engineering science

Pub Date : 2025-04-22 DOI: 10.1016/j.apples.2025.100224

D.E.P. Klenam , F. McBagonluri , T.K. Asumadu , S.A. Osafo , M.O. Bodunrin , L. Agyepong , E.D. Osei , D. Mornah , W.O. Soboyejo

Additive manufacturing (AM) is an innovative approach to the manufacturing mix globally. In this era of overwhelming complexities, tremendous competition and accelerated change, the increasing drive for rapid prototyping has necessitated the deployment of AM technologies and research. Three-dimensional (3D) modelling, 3D scanning and 3D printing have provided the impetus for design of functional and structural components at industrial scale. To contextualize the manufacturing landscape, an overview, and recent trends of conventional (subtractive) manufacturing technologies are discussed briefly. The challenges associated with these subtractive technologies in an increasingly resource constraint and exponential population growth paved the way for massification of AM approaches. Recent advances in AM technologies and applications in healthcare, construction, automotive and aerospace industries are discussed. The milestones, trends, opportunities, and challenges of AM technologies to the nascent technological landscape of Africa are also discussed. This review identifies AM as a pivotal enabler of Africa Union’s Agenda 2063, offering actionable pathways to overcome persistent challenges in industrial diversification, youth unemployment, and technological self-sufficiency. By leveraging localized AM applications and digital workflows, scalable solutions for sustainable development and manufacturing sovereignty can be realized with implications in leapfrogging the industrialization aspirations of Africa.

增材制造（AM）是全球制造组合的一种创新方法。在这个压倒性的复杂性，巨大的竞争和加速变化的时代，对快速原型的日益增长的动力使得AM技术和研究的部署成为必要。三维（3D）建模、3D扫描和3D打印为工业规模的功能和结构部件的设计提供了动力。为了使制造业的环境，概述和传统（减法）制造技术的最新趋势进行了简要讨论。在资源日益紧张和人口指数增长的情况下，与这些减法技术相关的挑战为增材制造方法的规模化铺平了道路。讨论了增材制造技术的最新进展以及在医疗保健、建筑、汽车和航空航天工业中的应用。还讨论了增材制造技术对非洲新兴技术前景的里程碑、趋势、机遇和挑战。本综述认为，AM是非洲联盟《2063年议程》的关键推动者，为克服工业多样化、青年失业和技术自给自足方面的持续挑战提供了可行途径。通过利用本地化的增材制造应用程序和数字工作流程，可以实现可持续发展和制造业主权的可扩展解决方案，从而实现非洲跨越式工业化愿望。

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引用次数: 0

Modelling and optimization of different pozzolanic materials in the durability of cement composite by central composite design 基于中心复合材料设计的不同火山灰材料对水泥复合材料耐久性的建模与优化

IF 2.2 Q2 ENGINEERING, MULTIDISCIPLINARY

Applications in engineering science

Pub Date : 2025-04-19 DOI: 10.1016/j.apples.2025.100221

Tsion Amsalu Fode , Yusufu Abeid Chande Jande , Thomas Kivevele

The production of Ordinary Portland Cement (OPC) requires high temperatures and significant energy consumption, leading to environmental pollution and posing challenges to the sustainability of green cementing materials. To address this, numerous researchers have explored replacing cement with various supplementary cementitious materials, such as blast furnace slag, active limestone, and bentonite in concrete or mortar. However, optimizing the combined use of these materials to achieve maximum durability in mortar remains a novel area of study. This research models and optimizes the effects of replacing OPC with blast furnace slag, active limestone, and bentonite in mortar using the central composite design method. The findings reveal that increasing the content of bentonite along with either blast furnace slag or limestone from 0 % to 20 % significantly minimizes strength degradation due to sulfuric acid exposure, improves heat resistance, and lowers water absorption at 28 days. The optimal substitution levels were found to be 20 % for both blast furnace slag and limestone, and 18.54 % for bentonite. The optumal result reduced damage from sulfate attack by 33.4 %, strength loss under high temperatures by 69.04 %, and water absorption by 98.58 % when compared to the control sample. These outcomes were validated experimentally with a 95 % confidence level. Overall, incorporating these SCMs not only improves the durability of mortar but also supports environmental sustainability by reducing CO₂ emissions due to OPC production.

普通硅酸盐水泥（OPC）的生产需要高温和大量的能源消耗，导致环境污染，并对绿色水泥材料的可持续性提出了挑战。为了解决这个问题，许多研究人员已经探索用各种补充胶凝材料代替水泥，如高炉矿渣、活性石灰石和混凝土或砂浆中的膨润土。然而，优化这些材料的组合使用以实现砂浆的最大耐久性仍然是一个新的研究领域。本研究采用中心复合设计方法，模拟并优化了以高炉矿渣、活性石灰石、膨润土替代砂浆中OPC的效果。研究结果表明，将膨润土与高炉炉渣或石灰石的含量从0%增加到20%，可以显著减少因硫酸暴露引起的强度退化，提高耐热性，并降低28天的吸水率。高炉矿渣和石灰石的最佳替代水平为20%，膨润土的最佳替代水平为18.54%。与对照试样相比，优化后的结果使硫酸盐侵蚀损伤降低33.4%，高温下强度损失降低69.04%，吸水率降低98.58%。这些结果在实验中得到了95%置信水平的验证。总的来说，结合这些scm不仅可以提高砂浆的耐久性，还可以通过减少OPC生产产生的二氧化碳排放来支持环境的可持续性。

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引用次数: 0

Axial load induced vibrational changes in nonlocal stress-driven beams 轴向载荷诱导非局部应力驱动梁的振动变化

IF 2.2 Q2 ENGINEERING, MULTIDISCIPLINARY

Applications in engineering science

Pub Date : 2025-04-16 DOI: 10.1016/j.apples.2025.100223

Indronil Devnath, Mohammad Nazmul Islam

This research examines the impact of axial load on the vibrational properties of nonlocal nanobeams. The theory of stress-driven nonlocal elasticity is utilized to characterize the response of the beam, integrating the influence of axial loads as a pivotal element in modifying its dynamic behavior. The governing equations for the beam's vibration are formulated through the application of stress-driven nonlocal elasticity theory, while investigating the influence of varying axial loads on natural frequencies and mode shapes. Analytical solutions are derived, and numerical simulations are performed to corroborate theoretical predictions. The findings indicate that axial loads have a substantial impact on the vibrational response, with alterations in both the natural frequencies and the mode shapes contingent upon the magnitude and direction of the axial load. The results provide significant understanding of the dynamic behavior of beams subjected to axial loads, especially within the framework of nonlocal stress-driven systems, which may have implications for structural health monitoring, vibration control, and material design.

本文研究了轴向载荷对非局部纳米梁振动特性的影响。利用应力驱动的非局部弹性理论来表征梁的响应，将轴向载荷的影响作为改变其动力行为的关键因素。应用应力驱动的非局部弹性理论建立了梁的振动控制方程，同时研究了不同轴向载荷对梁固有频率和振型的影响。推导了解析解，并进行了数值模拟以证实理论预测。研究结果表明，轴向载荷对振动响应有重大影响，固有频率和模态振型的变化取决于轴向载荷的大小和方向。研究结果对梁在轴向载荷作用下的动态行为提供了重要的理解，特别是在非局部应力驱动系统的框架内，这可能对结构健康监测、振动控制和材料设计具有重要意义。

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引用次数: 0