Thin-Walled Structures最新文献_第5页

An equivalent average shear stress yield criterion based on Simpson's numerical integration rule and its application in burst pressure analysis of thin-walled pipelines 基于辛普森数值积分规则的等效平均剪应力屈服准则及其在薄壁管道爆破压力分析中的应用

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2024-10-28 DOI: 10.1016/j.tws.2024.112613

Yongsheng Shi , Yanhui Qie , Jinhua Song , Yutong Li

Pipelines are a crucial transportation infrastructure for the long-distance transport of natural gas, oil, and other hydrocarbons, typically conducted through thin-walled pipes (

D / t \geq 20

). Accurate prediction of the burst pressure of thin-walled pipelines is essential for their safe and reliable operation. To enhance the prediction accuracy of the burst pressure for defect-free, straight, thin-walled pipes, a new numerical integration yield criterion was proposed between the Tresca and Mises criteria, using the mean value of Simpson's numerical integration (MSI) as the equivalent shear stress. A new burst pressure prediction formula was then constructed using the MSI yield criterion. The burst pressure predictions based on different yield criteria were compared with experimental data. Additionally, the burst pressure curves of the new prediction formula were plotted, and the relative errors between the new prediction formula and four existing prediction formulas were analyzed and compared. The results indicate that the new burst pressure prediction formula using the MSI yield criterion closely matches the experimental data, with the best relative error result within a confidence interval of ±1.3 %. The Lord parameter curve and plane stress curve of the MSI yield criterion exhibit good consistency with the experimental data of various ductile metal materials. The new burst pressure formula established by incorporating the MSI criterion provides a safe, economical, and reliable theoretical foundation for the design, manufacture, inspection, and safety assessment of thin-walled pipelines in production practice.

管道是长距离输送天然气、石油和其他碳氢化合物的重要运输基础设施，通常通过薄壁管道（D/t≥20）进行输送。准确预测薄壁管道的爆破压力对其安全可靠运行至关重要。为了提高对无缺陷直薄壁管道爆破压力的预测精度，在 Tresca 和 Mises 准则之间提出了一种新的数值积分屈服准则，使用辛普森数值积分平均值 (MSI) 作为等效剪应力。然后利用 MSI 屈服准则构建了新的爆破压力预测公式。将基于不同屈服准则的爆破压力预测值与实验数据进行了比较。此外，还绘制了新预测公式的爆破压力曲线，并分析和比较了新预测公式与四种现有预测公式之间的相对误差。结果表明，使用 MSI 屈服准则的新爆破压力预测公式与实验数据非常吻合，最佳相对误差结果的置信区间为 ±1.3%。MSI 屈服准则的主参数曲线和平面应力曲线与各种韧性金属材料的实验数据具有良好的一致性。结合 MSI 准则建立的新爆破压力公式为生产实践中薄壁管道的设计、制造、检验和安全评估提供了安全、经济和可靠的理论基础。

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引用次数: 0

A temperature-regulated multi-material compression-torsion metamaterial with local bistability 具有局部双稳态性的温度可调多材料压缩扭转超材料

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2024-10-28 DOI: 10.1016/j.tws.2024.112629

Hao Chen , Yongtao Yao , Yanju Liu , Wenfeng Bian

In this paper, based on the compression-torsion coupling structure, we designed and fabricated a structure that exhibits a temperature-controlled local bistability phenomenon during uniaxial compression at different temperatures. In the structure, based on the quadrilateral rigid frames, the flexible connecting bands are hinged to the frames by pins, and the shape memory polymer inclined struts are bonded to the frames. The compression-torsion coupling causes the bend of the inclined struts and the rotation of the rigid frames, then causing the connecting bands to post-buckling. The inclined struts can adjust and control the deformation process under thermal loads, because the modulus of the shape memory polymer is controlled by temperature, so that the deformation of the structure is reversible/irreversible under programmable temperature/displacement loads. The analytical model and numerical simulation show that the local bistability can be achieved under temperature control and different boundary conditions. An assembled metamaterial structure is fabricated by combining 3D printed parts. The relationships between the reversibility/irreversibility of the structural deformation and temperature/displacement loads are verified by experiments. The local bistable phenomenon enables the structure to remember the history of the load, providing inspiration for new functional designs in the fields of intelligent memory, encoding display, and vibration energy absorption.

本文以压缩-扭转耦合结构为基础，设计并制造了一种在不同温度下进行单轴压缩时表现出温控局部双稳态现象的结构。在该结构中，以四边形刚性框架为基础，柔性连接带通过销钉与框架铰接，形状记忆聚合物斜支撑与框架粘合。压缩-扭转耦合使斜杆弯曲，刚性框架旋转，然后使连接带发生后屈曲。由于形状记忆聚合物的模量受温度控制，因此在可编程的温度/位移载荷作用下，结构的变形是可逆/不可逆的。分析模型和数值模拟表明，在温度控制和不同的边界条件下，可以实现局部双稳态。通过结合三维打印部件，制造出了装配式超材料结构。实验验证了结构变形的可逆性/不可逆性与温度/位移载荷之间的关系。局部双稳态现象使结构能够记住负载的历史，为智能记忆、编码显示和振动能量吸收等领域的新型功能设计提供了灵感。

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引用次数: 0

Non-destructive buckling load estimation of oblate ellipsoidal domes using the vibration correlation technique 利用振动相关技术对扁平椭圆形穹顶的屈曲载荷进行非破坏性估算

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2024-10-28 DOI: 10.1016/j.tws.2024.112612

Gopikrishna R. , G. Raju , Ramkrishna D.

In this paper, experimental and numerical studies based on the vibration correlation technique (VCT) are employed to non-destructively determine the buckling load of oblate ellipsoidal domes subjected to external pressure loading. Two nominally identical isotropic oblate ellipsoidal domes are fabricated, and experiments are conducted using specially designed fixtures and a hydraulic system for applying pressure. The dome’s deformation, strains, and modal response are measured at different pressure loads and analyzed. Conventional and modified VCT approaches are used to evaluate the buckling load. The experimental buckling results are compared with VCT predictions and the effect of various factors like mode number of interest, reference natural frequency, number of data points, and reference critical buckling load are studied. The results from this work serve as a validation for the applicability of VCT in predicting the buckling load of oblate ellipsoidal dome structures.

本文采用基于振动相关技术（VCT）的实验和数值研究，非破坏性地确定了扁球形椭圆穹顶在外部压力加载下的屈曲载荷。制作了两个名义上完全相同的各向同性扁球形椭圆穹顶，并使用专门设计的夹具和液压系统施加压力进行了实验。在不同的压力负荷下，对穹顶的变形、应变和模态响应进行了测量和分析。采用传统和改进的 VCT 方法来评估屈曲载荷。实验屈曲结果与 VCT 预测结果进行了比较，并研究了相关模态数、参考固有频率、数据点数量和参考临界屈曲载荷等各种因素的影响。这项工作的结果验证了 VCT 在预测扁椭圆形穹顶结构屈曲载荷方面的适用性。

引用次数: 0

Full active counter-roller spinning for thin-walled cylinders: Macroscopic deformation mechanism, mesoscopic texture evolution, and forming performance strengthening 薄壁圆筒的全主动对辊纺纱：宏观变形机理、中观纹理演变和成形性能强化

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2024-10-28 DOI: 10.1016/j.tws.2024.112634

Ning Yang , Zhishun Li , Lijun Zhang , Lukuan Li , Su Liu , Xianfeng Chen , Hang Wang , Shen Fan , Shuqin Fan , Jiayi Xu

The reliability and lightweight of hydrogen high-pressure storage present pressing global challenges. The forming mechanism of a novel full active counter-roller spinning (FACRS) process for thin-walled cylinders is studied from the perspective of macro‑meso coupling. This innovative process holds promise as a replacement for conventional mandrel spinning, enabling enhanced integration of form and property in manufacturing hydrogen bottle liners. Employing optimal Latin hypercube sampling, a response surface model is constructed for forming consistency (λ) of inner and outer surfaces, yielding an optimal set of process parameters under the Hooke-Jeeves algorithm. The resulting spun parts exhibit a more balanced and superior performance. A macro‑meso gradual cross-scale coupling simulation methodology is proposed, revealing that the process is characterized by the initial aggregation and subsequent reinforcement of texture, culminating in the formation of a "soft" rotated cubic texture, which still faces impediments or diminishes the orientation of texture. It is demonstrated that the evolution of texture is the result of the interactive coordination of various slip systems. Furthermore, the FACRS experiments and performance tests indicate that while enhancing the axial and circumferential mechanical properties of the spun parts, it also reduces material anisotropy. The grain refinement effect of the process has also led to a more uniform distribution of dimples on the fracture surface. The surface performance of the final spun parts improves by 60.11 %. These enhancements can be attributed to the combined effects of improved forming consistency, coordinated action of slip systems, and grain refinement. These results deepen the understanding of the macro‑meso deformation mechanisms underlying the novel process, providing valuable insights for further advancements in counter-roller spinning technology.

氢气高压存储的可靠性和轻量化是一项紧迫的全球性挑战。本文从宏观-微观耦合的角度研究了用于薄壁圆筒的新型全主动对辊纺纱（FACRS）工艺的成型机制。这种创新工艺有望取代传统的心轴旋压工艺，从而在制造氢气瓶内衬时加强形状和性能的整合。利用最优拉丁超立方采样，构建了内外表面成形一致性 (λ) 的响应面模型，并根据胡克-杰维斯算法生成了一组最优工艺参数。由此产生的纺丝部件表现出更均衡、更优越的性能。研究提出了一种宏观-微观渐进跨尺度耦合模拟方法，揭示了这一过程的特点是纹理的初始聚集和随后的强化，最终形成 "软 "旋转立方纹理，但仍面临阻碍或纹理取向的减弱。实验证明，纹理的演变是各种滑移系统交互协调的结果。此外，FACRS 实验和性能测试表明，在提高纺丝部件轴向和周向机械性能的同时，也降低了材料的各向异性。该工艺的晶粒细化效果还使断裂面上的凹痕分布更加均匀。最终纺制部件的表面性能提高了 60.11%。这些改进可归因于成形一致性的改善、滑移系统的协调作用以及晶粒细化的综合效应。这些结果加深了人们对新工艺背后的宏观介质变形机制的理解，为进一步推动对辊纺纱技术的发展提供了宝贵的见解。

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引用次数: 0

Moment capacity of cold-formed steel channel beams with edge-stiffened and unstiffened elongated web holes 带有边缘加劲和非加劲细长腹板孔的冷弯槽钢梁的承载力

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2024-10-26 DOI: 10.1016/j.tws.2024.112605

Dinesh Lakshmanan Chandramohan , Krishanu Roy , Zhiyuan Fang , Beulah Gnana Ananthi. G , James B.P. Lim

Cold-formed steel channel beams (CFSCB) often incorporate web holes to accommodate building services, but this reduces their moment capacity due to decreased web area. Recent studies have shown that a new type of edge-stiffened web holes can enhance moment capacity, especially for circular ones, and can now be extended to elongated web holes. However, there hasn't been research on the moment capacity of such CFSCB with elongated web holes. This paper uses finite element analysis (FEA) to examine the moment capacity and flexural behaviour of such beams with both elongated edge-stiffened web holes (EEH) and elongated unstiffened web holes (EUH). After validating the FEA models against experimental results available in the literature, a comprehensive parametric study involving 2160 FEA models was conducted. Results showed that CFSCB with EEH exhibited, on average, a 9 % increase in moment capacity compared to those with EUH. Additionally, the parametric results were compared with the design capacities calculated from existing standards for CFSCB with unstiffened web holes. It was found that the current design equations for CFSCB with EUH were overly conservative by 9 % and 66 %, on average, for distortional or local buckling failure and lateral-torsional buckling failure, respectively. Consequently, modified Direct Strength Method (DSM) design equations were proposed to calculate the moment capacity of CFSCB with both EEH and EUH. Finally, a reliability analysis was conducted to assess the accuracy of the proposed design equations.

冷弯槽钢梁（CFSCB）通常会在腹板上开孔，以容纳建筑设施，但由于腹板面积减少，会降低其弯矩承载能力。最近的研究表明，一种新型的边缘加固腹板孔可以提高弯矩承载能力，尤其是圆形腹板孔，现在还可以扩展到加长腹板孔。然而，目前还没有关于这种带有细长腹板孔的 CFSCB 的弯矩承载能力的研究。本文采用有限元分析法（FEA）研究了带有加长边缘加劲腹板孔（EEH）和加长非加劲腹板孔（EUH）的此类梁的承载力和抗弯性能。在根据文献中的实验结果对有限元分析模型进行验证后，进行了一项涉及 2160 个有限元分析模型的综合参数研究。研究结果表明，与带 EUH 的 CFSCB 相比，带 EEH 的 CFSCB 的弯矩承载能力平均提高了 9%。此外，还将参数化结果与根据现有标准计算出的带有非加固腹板孔的 CFSCB 的设计承载力进行了比较。结果发现，对于扭曲或局部屈曲失效以及横向扭转屈曲失效，带 EUH 的 CFSCB 的现行设计公式过于保守，平均分别保守了 9% 和 66%。因此，提出了修改后的直接强度法（DSM）设计方程，用于计算带 EEH 和 EUH 的 CFSCB 的弯矩承载力。最后，还进行了可靠性分析，以评估所提出的设计方程的准确性。

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引用次数: 0

Mechanical behaviour of rigid-flexible combined structures: Aluminium-inflated membrane beams for application in floating photovoltaic platform 刚柔结合结构的机械性能：应用于浮动光伏平台的铝充气膜梁

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2024-10-26 DOI: 10.1016/j.tws.2024.112628

Yunling Ye , Jin Gan , Weiguo Wu , Shan Wang , C. Guedes Soares

This study aims to investigate the bending and failure behaviour of aluminium-inflated membrane beams for their applications in floating photovoltaic platforms. Four-point bending tests are conducted for a range of inflated pressures and two different deck heights to assess their effect on structural stiffness and ultimate bearing capacity. Meanwhile, the surface-based fluid cavity method is employed to develop the finite element model with the material properties determined by independent coupon-level tests. The bearing capacity of the aluminium-inflated membrane beam is positively correlated with the internal pressure and deck height. The midspan strain distribution is similar to those of the traditional four-point bending beam with the upper part undergoing compression and the lower part experiencing tension, however, the structural behaviour at the failure stage is different. Failure typically occurs due to localised depressions at the loading points on the aluminium deck, ultimately leading to structural failure. The numerical model closely matches the experimental data for the initial inflated and bending configurations, exhibiting a deviation of only 0.10 % to 0.46 % in diameter and 0.32 % to 5.57 % in equivalent bending stiffness. A parametric study shows that the loading properties of the beam are more sensitive to the internal pressure than the deck height and thickness.

本研究旨在调查铝制充气膜梁在浮动光伏平台应用中的弯曲和破坏行为。针对一系列充气压力和两种不同的甲板高度进行了四点弯曲试验，以评估它们对结构刚度和极限承载能力的影响。同时，采用基于表面的流体空穴法建立有限元模型，材料属性由独立的试样水平测试确定。铝制充气膜梁的承载能力与内部压力和桥面高度呈正相关。中跨应变分布与传统的四点弯曲梁相似，上部受压，下部受拉，但破坏阶段的结构行为不同。破坏通常发生在铝甲板加载点的局部凹陷处，最终导致结构破坏。数值模型与初始充气和弯曲配置的实验数据非常吻合，直径偏差仅为 0.10 % 至 0.46 %，等效弯曲刚度偏差为 0.32 % 至 5.57 %。参数研究表明，梁的加载特性对内压比甲板高度和厚度更敏感。

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引用次数: 0

Thermal performance analysis and optimization of air-supported membrane building envelope based on numerical simulation 基于数值模拟的空气支撑膜建筑围护结构的热性能分析与优化

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2024-10-26 DOI: 10.1016/j.tws.2024.112615

Chengyang Huang , Yuying Sun , Hongyan Wang , Mingxin Pang , Wei Wang , Wenzhe Wei

Air-supported membrane (ASM) envelopes offer an effective solution for creating large interior spaces for buildings with lower energy consumption and carbon emissions. However, there is little research on the thermal performance of ASM envelopes, particularly regarding the natural convection within the air interlayer and its impact on thermal resistance. To address this gap, this study developed a numerical model of ASM envelopes and validated it through experiments. Subsequently, a numerical investigation was conducted to analyze natural convection and thermal resistance while considering factors such as indoor-outdoor temperature difference, membrane emissivity and air interlayer thickness. Results indicated that with the emissivity increased from 0.2 to 1, the thermal resistance of the air interlayer and the envelope decreased by 32.35 % and 9.13 %, respectively. Besides, the thickness of air interlayer also had evident effect on thermal resistance. When it increased from 5 mm to 35 mm, the thermal resistance of the air interlayer and the envelope increased by 156.19 % and 14.74 %, and further results in the heat transfer decreased by 13.85 %. However, the convective heat transfer would remain constant when the thickness exceeded 35 mm. This study provided valuable reference for optimizing the design of ASM envelopes and accurately calculating their thermal resistance.

空气支撑膜（ASM）围护结构提供了一种有效的解决方案，可以为建筑物创造大面积的内部空间，同时降低能耗和碳排放。然而，有关 ASM 围护结构热性能的研究很少，尤其是关于空气夹层内的自然对流及其对热阻的影响。针对这一空白，本研究开发了 ASM 围护结构的数值模型，并通过实验进行了验证。随后，在考虑室内外温差、薄膜发射率和空气夹层厚度等因素的同时，对自然对流和热阻进行了数值研究分析。结果表明，当发射率从 0.2 提高到 1 时，空气夹层和围护结构的热阻分别降低了 32.35% 和 9.13%。此外，空气夹层的厚度对热阻也有明显影响。当其厚度从 5 毫米增加到 35 毫米时，空气夹层和围护结构的热阻分别增加了 156.19 % 和 14.74 %，并进一步导致传热量减少了 13.85 %。然而，当厚度超过 35 毫米时，对流传热保持不变。这项研究为优化 ASM 围护结构的设计和精确计算其热阻提供了宝贵的参考。

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引用次数: 0

Effect of elastic support on the vibration characteristics of mistuned coated blisks 弹性支撑对雾化涂层磁盘振动特性的影响

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2024-10-26 DOI: 10.1016/j.tws.2024.112616

Xianfei Yan , Wei Sun

Boundary conditions significantly affect the vibration characteristics of mechanical structures. Hard coatings are applied to reduce the vibration levels of blisks, and the modelling methods and vibration characteristics of mistuned coated blisks have been investigated under hard-support boundary conditions. However, the behavior of coated blisks under elastic support has not been previously studied. This paper presents a finite element model to simulate elastic support using two methods and develops reduced-order models to analyze coated blisks under elastic support. Furthermore, the effects of elastic support on the vibration characteristics of tuned, deterministic, and randomly mistuned blisks are investigated with a detailed discussion of the underlying mechanisms. The results indicate that elastic support has a notable impact on the natural frequencies and resonant responses at nodal diameters 1 and 2 in tuned-coated blisks. For deterministic mistuned blisks, the amplitude amplification factor varies in frequency-veering regions and frequency-intersecting regions with increasing support stiffness. Elastic support can reduce the forced responses of randomly mistuned blisks, and the well-known peak-value phenomenon is not observed in some cases based on statistical analyses.

边界条件对机械结构的振动特性有很大影响。硬涂层的应用可降低叶盘的振动水平，在硬支撑边界条件下，已对雾化涂层叶盘的建模方法和振动特性进行了研究。但是，以前还没有研究过弹性支撑下涂层叶盘的行为。本文提出了一种使用两种方法模拟弹性支撑的有限元模型，并建立了简化模型来分析弹性支撑下的涂布叶盘。此外，还研究了弹性支撑对调谐、确定性和随机失谐叶盘振动特性的影响，并详细讨论了其基本机制。结果表明，弹性支撑对调谐涂层叶盘节点直径 1 和 2 的固有频率和共振响应有显著影响。对于确定性失谐叶盘，振幅放大系数在频率偏移区域和频率相交区域随支撑刚度的增加而变化。根据统计分析，弹性支撑可降低随机失谐叶盘的强迫响应，在某些情况下不会出现众所周知的峰值现象。

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引用次数: 0

HSMAOA: An enhanced arithmetic optimization algorithm with an adaptive hierarchical structure for its solution analysis and application in optimization problems HSMAOA：一种具有自适应分层结构的增强型算术优化算法，用于优化问题的求解分析和应用

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2024-10-26 DOI: 10.1016/j.tws.2024.112631

Jingsen Liu , Jianggui Zhao , Yu Li , Huan Zhou

The Arithmetic Optimization Algorithm (AOA) has recently gained significant attention as a novel meta-heuristic algorithm. However, it faces challenges such as premature convergence and entrapment in local optima when addressing complex optimization problems. To overcome these limitations, this paper proposes an enhanced AOA, termed the Self-Adaptive Hierarchical Arithmetic Optimization Algorithm (HSMAOA). The proposed method integrates three key strategies: Firstly, a spiral-guided random walk mechanism is introduced to improve global search ability. Secondly, a novel adaptive hierarchy leader and follower mechanism is proposed, which establishes a complete multi-branch tree hierarchy with decreasing branching degrees within the population, thereby increasing information exchange among population individuals to escape local optima. Finally, a differential mutation strategy based on ranked selection is introduced to enhance candidate solution quality. HSMAOAʼs performance was evaluated on the CEC2022 test suite against some state-of-the-art algorithms. Results, including optimization accuracy analysis, convergence curves, and various statistical tests, demonstrate HSMAOAʼs superior optimization capability and robustness. In addition, tests on eight engineering structure optimization problems, including the pressure vessel design problem, the multiple disk clutch brake design problem, and the step-cone pulley problem, and so forth, further validate its effectiveness. Thus, HSMAOA shows strong competitiveness in complex optimization tasks and potential for a wide range of applications, and is an advantageous and promising alternative solution for optimization problems.

算术优化算法（AOA）作为一种新颖的元启发式算法，最近受到了广泛关注。然而，在解决复杂的优化问题时，它面临着过早收敛和陷入局部最优等挑战。为了克服这些局限性，本文提出了一种增强型 AOA，即自适应分层优化算法（HSMAOA）。所提出的方法集成了三个关键策略：首先，引入了螺旋引导的随机行走机制，以提高全局搜索能力。其次，提出了一种新颖的自适应分层领导者和追随者机制，在种群内部建立了一个分支度递减的完整多分支树状分层，从而增加种群个体间的信息交流，摆脱局部最优。最后，还引入了基于排序选择的差分突变策略，以提高候选解的质量。在 CEC2022 测试套件中，对 HSMAOA 的性能进行了评估，并与一些最先进的算法进行了比较。包括优化精度分析、收敛曲线和各种统计测试在内的结果表明，HSMAOA 具有卓越的优化能力和鲁棒性。此外，对压力容器设计问题、多盘离合器制动器设计问题和阶梯锥滑轮问题等八个工程结构优化问题的测试进一步验证了其有效性。因此，HSMAOA 在复杂的优化任务中显示出强大的竞争力和广泛的应用潜力，是优化问题的一种具有优势和前景的替代解决方案。

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引用次数: 0

Quasi-static crushing response of a novel triaxial isotropy mechanical metamaterial with dual-platform property 具有双平台特性的新型三轴各向同性力学超材料的准静态挤压响应

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2024-10-26 DOI: 10.1016/j.tws.2024.112630

Runzhi Lu, Qian Zhang, Huizhong Zhang, Marco Meloni, Jian Feng, Jianguo Cai

A novel triaxial isotropy origami metamaterial with dual-platform is proposed by combining the tachi tubes and the honeycomb structures. Crushing responses of the hexahedral metamaterial under quasi-static compression load are investigated through experimental tests and numerical simulations. Experimental and numerical results reveal that the hexahedral metamaterial sample shows three deformation modes. Meanwhile, the numerical predictions of deformation modes and locations agree very well with the experimental results. Moreover, the effect of aspect ratio, thickness-to-span ratio, angle on the deformation mode, peak stress, plateau stress of different stages, and specific energy absorption (SEA_M, SEA_V) is investigated. Finally, the proposed metamaterial is compared with traditional honeycomb. The numerical results demonstrate that the SEA_M of the hexahedral metamaterial is 90.6 % of the traditional honeycomb in the Z-direction. However, during X/Y-direction compression, the energy absorption capacity of the hexahedral metamaterial is 13.0 and 12.2 times that of the traditional honeycomb, respectively.

通过结合太极管和蜂巢结构，提出了一种新型三轴各向同性双平台折纸超材料。通过实验测试和数值模拟研究了六面体超材料在准静态压缩载荷下的挤压响应。实验和数值结果表明，六面体超材料样品呈现出三种变形模式。同时，变形模式和位置的数值预测与实验结果非常吻合。此外，还研究了长宽比、厚跨比、角度对变形模式、峰值应力、不同阶段的高原应力以及比能量吸收（SEAM、SEAV）的影响。最后，将所提出的超材料与传统蜂窝材料进行了比较。数值结果表明，在 Z 方向上，六面体超材料的 SEAM 是传统蜂窝的 90.6%。然而，在 X/Y 方向压缩时，六面体超材料的能量吸收能力分别是传统蜂窝的 13.0 倍和 12.2 倍。

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引用次数: 0