Thin-Walled Structures最新文献_第10页

Stress relaxation behavior and prediction analysis under high-low temperature, initial load and angle-ply of M55J-CF/CE composites in spaceborne 星载M55J-CF/CE复合材料高低温、初始载荷和角铺层应力松弛行为及预测分析

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-14 DOI: 10.1016/j.tws.2026.114519

Shuai Yang , Likun Zheng , Hanjun Gao , Yuhan Xin , Qiong Wu , Yan Zhang

Under the complex coupled effect of temperature and load fields, the internal stress state of carbon fiber reinforced polymers (CFRP) composites and its components undergo unpredictable changes, which greatly affects the accuracy and lifespan. In this study, the M55J-carbon fiber/cyanate ester (M55J-CF/CE) composites was used as the research object, which the bending strength and deflection experiment under high-low temperatures was performed, the strength decreases and the deflection value increases with the temperature rises was obtained, and provided parameters selection basis for the stress relaxation experiment research. Based on this, the stress relaxation experiment studies under high and low temperatures (-150°C ∼ +180°C) and initial loads (400 N, 800 N, and 1200 N) were carried out, and the high-temperature relaxation and low-temperature rebound relaxation variation law induced by the temperature-load-configuration was obtained. Furthermore, the constitutive parameters under the action of temperature and load were corrected based on the time-hardening model (THM), and the stress distribution prediction and evolution law research were carried out in combination with FEM. The research results show that temperature has the highest sensitivity to stress relaxation, and the relaxation trends caused by different loads are identical, the experiment maximum stress relaxation rate under the coupling effect of temperature and load is 58%, and the simulation prediction model error is <10%. Additionally, the cyclic angle laminate compared with single angle laminate shows an effect of ‘bias pressure mitigation leapfrog’ relaxation behavior, then the influence of layup angle, temperatures and initial loads to the stress relaxation mechanism were revealed.

在温度场和载荷场的复杂耦合作用下，碳纤维增强聚合物（CFRP）复合材料及其组分的内应力状态发生不可预测的变化，极大地影响了材料的精度和寿命。本研究以m55j -碳纤维/氰酸酯（M55J-CF/CE）复合材料为研究对象，进行了高低温下的抗弯强度和挠度实验，得到了强度随温度升高而减小，挠度值随温度升高而增大的结果，为应力松弛实验研究提供了参数选择依据。在此基础上，进行了高低温（-150°C ~ +180°C）和初始载荷（400 N、800 N和1200 N）下的应力松弛实验研究，得到了温度载荷配置诱导的高温松弛和低温回弹松弛变化规律。在此基础上，基于时间硬化模型（THM）对温度和载荷作用下的本构参数进行了修正，并结合有限元法进行了应力分布预测和演化规律研究。研究结果表明，温度对应力松弛的敏感性最高，且不同载荷引起的松弛趋势相同，温度与载荷耦合作用下的实验最大应力松弛率为58%，仿真预测模型误差为10%。此外，与单角层合板相比，循环角层合板表现出“偏压缓跃”弛豫行为，揭示了铺层角、温度和初始载荷对应力弛豫机制的影响。

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引用次数: 0

A non-linear FE - direct BE based model for vibroacoustic energy transmission analysis through FG double-panel structures in hygrothermal environment 热湿环境下FG双板结构振动声能量传递分析的非线性有限元-直接BE模型

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-14 DOI: 10.1016/j.tws.2026.114499

Ashish Kumar Singh , Atanu Sahu

Double-panel structures made of advanced composite materials are being used now-a-days in different aerospace applications. The present research work investigates the vibroacoustic energy transmission behaviour of functionally graded (FG) double-panel structures in hygrothermal environment by developing a numerical model based on a non-linear strain based finite element (FE) and a direct boundary element (BE) approaches. The structural panels are modelled using the FE method, wherein the first order shear deformation theory is adopted. The effect of hygrothermal environment is included in the FE model through Green–Lagrange non-linear strains in the elastic stress–strain relationship. The air-cavity in between the panels is modelled following the BE approach and are subsequently coupled to the FE model to ensure energy transfer between two domains. The present MATLAB based numerical model is verified by developing another FE model of the double-panel structure in COMSOL Multiphysics platform. A thorough investigation is done to evaluate individual and combined effects of temperature and moisture concentration, material gradation index, material properties of structural panels in the energy transmission behaviour of different FG double-panel structures. Results indicate that increased exposure of temperature and moisture concentration aid to a stronger mode coupling and thereby significantly enhances energy transmission through these structures. Moreover, less impact of FG material gradation on the energy transmission in hygrothermal environment is reported. These findings are valuable for developing effective vibration and noise control strategies, and will also serve as a benchmark for future research works in this area.

如今，由先进复合材料制成的双面板结构在不同的航空航天应用中得到应用。本文采用非线性应变有限元法和直接边界元法建立数值模型，研究了功能梯度（FG）双层板结构在湿热环境下的振动声能量传输行为。采用一阶剪切变形理论对结构板进行有限元模拟。通过弹性应力-应变关系中的格林-拉格朗日非线性应变，将湿热环境的影响纳入有限元模型。面板之间的空腔按照BE方法建模，随后与有限元模型耦合，以确保两个域之间的能量传递。通过在COMSOL Multiphysics平台上开发另一个双面板结构的有限元模型，验证了基于MATLAB的数值模型。研究了温度和湿度浓度、材料级配指数、结构板材料性能对不同FG双层板结构能量传输性能的单独和综合影响。结果表明，温度和湿度浓度的增加有助于增强模式耦合，从而显著增强通过这些结构的能量传输。此外，在湿热环境中，FG材料级配对能量传递的影响较小。这些发现对于制定有效的振动和噪声控制策略具有重要价值，也将为该领域未来的研究工作提供参考。

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引用次数: 0

Impact damage analysis of carbon fiber reinforced polymer composite tendons at varying span lengths and pretensions 碳纤维增强聚合物复合材料筋在不同跨度和预应力下的冲击损伤分析

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-14 DOI: 10.1016/j.tws.2026.114532

Xiaogang Liu, Bujiu Sang, Ruiheng Li, Anni Wang

To investigate the effects of span and pretension on the impact resistance and damage failure mechanisms of carbon fiber reinforced polymer (CFRP) composite tendon, this study examined the impact response, damage modes, and post-impact residual performance of CFRP tendons with spans of 600 mm and 1800 mm under 0 % and 20 % pretension. The analysis included 122.5 J low-speed impact testing, computed tomography scanning, post-impact tensile testing, and scanning electron microscopy imaging. Results revealed that at the macroscopic level, the 600-mm-span CFRP tendon exhibits fiber fracture at the rear impact point and crack propagation toward both anchor ends, whereas no apparent macroscopic damage is observed for the 1800-mm-span CFRP tendon. At the microscopic level, impact-induced internal damage primarily manifests as vertical interfacial shear failure induced by transverse compression. An increased span eliminates internal shear microcracks and enhances the deformation capacity of the CFRP tendon, thereby increasing its elastic energy absorption. Conversely, greater pretension has minimal influence on elastic energy absorption but mitigates the degree of compression damage and exerts a hardening and strengthening effect, raising the peak impact load and reducing deformation. Overall, a greater span and higher pretension improve the residual performance after impact, with a strength retention rate of 91.8 % observed for the 1800-mm-span CFRP tendon under 20 % pretension. Furthermore, an increased span reduces shear-related impact damage and alters the tensile failure mode from a clean fracture to scattered filament-like failure.

为了研究碳纤维增强聚合物（CFRP）复合筋在预张力为0%和20%时的冲击响应、损伤模式和冲击后残余性能，研究了跨度为600 mm和1800 mm碳纤维增强聚合物（CFRP）复合筋的抗冲击性能和损伤破坏机制。分析包括122.5 J低速冲击试验、计算机断层扫描、冲击后拉伸试验和扫描电镜成像。结果表明，在宏观水平上，600 mm跨度CFRP筋在后冲击点出现纤维断裂，裂缝向锚固两端扩展，而1800 mm跨度CFRP筋在宏观上未见明显损伤；微观层面上，冲击引起的内部损伤主要表现为横向压缩引起的竖向界面剪切破坏。增大跨度消除了CFRP筋的内部剪切微裂纹，增强了CFRP筋的变形能力，从而增加了CFRP筋的弹性能吸收。相反，较大的预紧力对弹性能量吸收的影响最小，但可以减轻压缩损伤程度，并发挥硬化强化作用，提高峰值冲击载荷，减少变形。总体而言，更大的跨度和更高的预张力改善了冲击后的残余性能，在20%预张力下，1800 mm-span CFRP肌腱的强度保持率为91.8%。此外，增加的跨度减少了剪切相关的冲击损伤，并将拉伸破坏模式从清洁断裂转变为分散的细丝状破坏。

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引用次数: 0

Study on the Theoretical model of shock initiation of thick-walled cased charges by rod projectiles 棒状弹厚壁装药起爆理论模型研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-13 DOI: 10.1016/j.tws.2026.114531

Keqiang Dong , Chengxin Du , Wenzheng Lv , Peng Wang , Haoyu Tian , Zhonghua Du , Feng Zhou

For the typical scenario of vertical impact of flat-headed tungsten alloy rod projectiles on steel-cased charges, a three-stage coupled numerical model encompassing cratering, stable penetration, and explosive detonation is established in this study. This model integrates penetration mechanics, structural dynamics, and detonation theory, enabling systematic description of the entire impact initiation process. Based on this model, integrating experimental tests and numerical simulations, the effects of rod projectile aspect ratio, casing thickness, and casing strength on the critical initiation velocity are systematically investigated. The results indicate that the critical initiation velocity decreases significantly (from 1825 m/s to 1450 m/s) as the rod projectile aspect ratio increases (from 5.2 to 13.2). In contrast, it increases (from 1450 m/s to 1800 m/s and from 1375 m/s to 1875 m/s) with increasing casing thickness (from 60 mm to 85 mm) and casing strength (from 780 MPa to 1780 MPa), respectively. Theoretical analysis reveals that these trends are attributed to the increased residual velocity of the rod projectile, extended penetration path, and enhanced material impedance, respectively. Furthermore, a dimensionless engineering prediction model is developed based on the aforementioned three-stage numerical model. The errors of this prediction model compared with numerical simulation results and experimental test results are all <5.38%, which validates its favorable engineering applicability.

针对平头钨合金棒弹垂直撞击钢包壳装药的典型场景，建立了包含弹坑、稳定侵彻和爆轰的三级耦合数值模型。该模型集成了侵彻力学、结构动力学和爆轰理论，能够系统地描述整个冲击起爆过程。在此模型的基础上，结合实验与数值模拟，系统研究了杆弹展弦比、机匣厚度和机匣强度对临界起爆速度的影响。结果表明：随着杆弹展弦比的增大（从5.2增加到13.2），临界起爆速度显著降低（从1825 m/s降低到1450 m/s）；相比之下，套管厚度（从60 mm增加到85 mm）和套管强度（从780 MPa增加到1780 MPa）分别增加（从1450 m/s增加到1800 m/s，从1375 m/s增加到1875 m/s）。理论分析表明，这些趋势分别归因于杆弹残余速度的增加、侵彻路径的延长和材料阻抗的增强。在此基础上，建立了无量纲工程预测模型。该预测模型与数值模拟结果和试验测试结果的误差均为5.38%，验证了其良好的工程适用性。

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引用次数: 0

Fire behaviour of austenitic stainless steel channels under compression: Experimental study and design 奥氏体不锈钢管道在压缩下的燃烧特性：实验研究与设计

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-13 DOI: 10.1016/j.tws.2026.114524

Zhe Xing , Kuntao Quan , Kaidong Wu , Boshan Chen , Ziheng Lu , Xinyu Zhou

Comprehensive experimental studies has been carried out into the fire behaviour of stainless steel components, most of which focus on the double-symmetric sections but not single-symmetric sections. To fill this gap, an experimental investigation into the fire behaviour of common austenitic stainless steel channels was carried out. Prior to stub column tests, the material properties of flat and corner regions of the tested stainless steel channels were examined. The geometric characteristics and local geometrical imperfections of the tested stainless steel channels were then measured and evaluated. A total of eight stub columns with two different channel sections were tested at four different temperature levels ranging from 20 to 800 °

C

, where their load-end shortening curves and failure behaviours were obtained and discussed. On the basis of the test results obtained from stub column tests, the design rules provided in the latest European fire design standard for steel EN 1993-1-2 were assessed. The comparisons between the test results and predicted results indicated that the design method of EN 1993-1-2 predicts the ultimate cross-sectional resistances of stainless steel channels in fire with good accuracy and reliability.

对不锈钢构件的防火性能进行了较为全面的试验研究，但大多集中在双对称截面，而非单对称截面。为了填补这一空白，对普通奥氏体不锈钢通道的燃烧行为进行了实验研究。在短柱试验之前，测试了不锈钢通道的平坦和角落区域的材料性能。然后对被测不锈钢通道的几何特性和局部几何缺陷进行了测量和评价。在20 ~ 800℃的四种不同温度水平下，对8根具有两种不同通道截面的短柱进行了测试，获得并讨论了它们的荷载-端缩短曲线和破坏行为。根据短柱试验获得的试验结果，对最新欧洲防火设计标准EN 1993-1-2中规定的设计规则进行了评定。试验结果与预测结果的比较表明，EN 1993-1-2的设计方法预测不锈钢通道在火灾中的极限截面阻力具有较好的准确性和可靠性。

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引用次数: 0

Effects of manufacturing defects and microstructure on the tensile and low cycle fatigue behavior of selective laser melting IN718 TPMS structures 制造缺陷和显微组织对选择性激光熔化IN718 TPMS组织拉伸和低周疲劳性能的影响

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-13 DOI: 10.1016/j.tws.2026.114528

Houjun Qin , Hui Hou , Changyou Xu , Jianan Song , Bensi Dong , Jia Huang

This study investigates the tensile performance and low cycle fatigue (LCF) behavior of Triply Periodic Minimal Surface (TPMS) structures fabricated by Selective Laser Melting (SLM). Due to complex lattice geometry and inherent poor thermal stability of the SLM process, surface roughness of TPMS structures is increased. Micro-CT analysis reveals defects, such as pores and gas voids, within TPMS structures, less common in traditional plate samples. The defect porosity in TPMS structures is 325 times greater than in plate specimens. Although increasing pore spacing to 0.25 mm improves tensile performance and fatigue life, tensile strength of TPMS structures remains lower than Inconel 718 plate samples due to lower relative density and higher defect sensitivity. Both finite element analysis and experimental results confirm significant stress concentrations in TPMS structures, particularly around defects serving as potential crack initiation sites. In contrast, plate samples exhibit more uniform stress distribution and superior mechanical performance. EBSD analysis shows grains in plate samples are primarily uniformly distributed equiaxed fine grains, while TPMS structures contain larger grains in the central region, with fine grains concentrated at the edges. Moreover, dislocation accumulation occurred at TPMS thin-wall edges, and recrystallized grains increased significantly. High dislocation density becomes a weak point under long-term fatigue, leading to crack formation. Additionally, distinct subgrains observed after fatigue deformation indicate original equiaxed grains fragmented, exacerbating deformation. This caused coarse-grained regions to undergo substantial plastic deformation, generating numerous voids. These microstructural differences likely significantly influence the mechanical performance of TPMS structures.

研究了选择性激光熔化法制备的三周期最小表面（TPMS）结构的拉伸性能和低周疲劳（LCF）行为。由于复杂的晶格几何形状和SLM工艺固有的较差的热稳定性，TPMS结构的表面粗糙度增加。显微ct分析揭示了TPMS结构中的缺陷，如孔隙和气体空洞，这些缺陷在传统的板样中不太常见。TPMS结构的缺陷孔隙率是板样的325倍。虽然将孔隙间距增加到0.25 mm可以提高拉伸性能和疲劳寿命，但由于相对密度较低和缺陷灵敏度较高，TPMS结构的抗拉强度仍然低于Inconel 718板样品。有限元分析和实验结果都证实了TPMS结构中显著的应力集中，特别是在作为潜在裂纹起裂点的缺陷周围。相比之下，板样表现出更均匀的应力分布和更好的力学性能。EBSD分析表明，板样晶粒主要为均匀分布的等轴细晶粒，TPMS结构中较大的晶粒分布在中心区域，细晶粒集中在边缘。此外，TPMS薄壁边缘出现位错积累，再结晶晶粒明显增多。在长期疲劳作用下，高位错密度成为薄弱点，导致裂纹的形成。此外，疲劳变形后观察到明显的亚晶表明原始等轴晶破碎，加剧了变形。这导致粗粒区域发生大量塑性变形，产生大量空洞。这些微观结构差异可能会显著影响TPMS结构的力学性能。

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引用次数: 0

Design and driving analysis of space deployable articulated mast using telescopic screw 空间可展开式伸缩螺钉铰接桅杆的设计与驱动分析

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-13 DOI: 10.1016/j.tws.2026.114529

Yutong Wang , Junjie Li , Chong Zhao , Enze Cui , Haifeng Zhao , Fei Zhang , Ke Wang

Deployable mechanisms are extensively utilized in space exploration to accommodate large payloads, including antennas, radar systems, and space telescopes, owing to their advantages in folding, deployment, transportation, and storage efficiency. This paper presents a novel design for a space deployable articulated mast using a telescopic screw mechanism. Compared with traditional torsion spring-driven methods, articulated mast offers enhanced driving force during deployment, leading to improved structural stiffness and reliability. Additionally, this modular deployable mast featuring an embedded telescopic screw actuation system which eliminates the need for an external drive envelope, achieving nearly 100% space efficiency. The unfolding process is dynamically modeled using the Lagrangian method, and the theoretical model is validated through ADAMS simulations. The deployment characteristics under various driving strategies are analyzed. By adopting a driving strategy of initial acceleration followed by deceleration, the truss unit completes deployment within 6 s, and the post-deployment driving force is effectively controlled at 13.57 N, enhancing the system’s dynamic stability. Finally, a prototype is developed to validate the unfolding, locking mechanisms, and dynamic characteristics of the mast, confirming the design’s effectiveness. Experimental results show excellent deployment precision, with maximum and mean end-tip deviations measured at 5 µm and 2.13 µm, respectively. This study serves as a valuable reference for the design, optimization, and control of deployable masts in future space exploration missions.

可展开机构由于其在折叠、展开、运输和储存效率方面的优势，在空间探索中广泛应用于容纳大型有效载荷，包括天线、雷达系统和空间望远镜。本文提出了一种采用伸缩螺旋机构的空间可展开铰接桅杆的新设计。与传统的扭簧驱动方法相比，铰接式井架在部署过程中提供了更强的驱动力，从而提高了结构刚度和可靠性。此外，这种模块化可展开桅杆具有嵌入式伸缩螺杆驱动系统，无需外部驱动信封，实现了近100%的空间效率。采用拉格朗日方法对展开过程进行了动态建模，并通过ADAMS仿真对理论模型进行了验证。分析了不同驱动策略下的车辆部署特性。采用先加速后减速的驱动策略，使桁架单元在6s内完成展开，有效地将展开后的驱动力控制在13.57 N，增强了系统的动态稳定性。最后，开发了一个原型来验证桅杆的展开、锁定机构和动态特性，验证了设计的有效性。实验结果表明，该系统具有良好的部署精度，最大端尖偏差为5µm，平均端尖偏差为2.13µm。该研究为未来空间探索任务中可展开桅杆的设计、优化和控制提供了有价值的参考。

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引用次数: 0

A comparative study on protective performance of polyurea-steel composite plates subjected to combined action of air blast and fragments 冲击波与破片复合作用下聚氨酯-钢复合板防护性能的对比研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-12 DOI: 10.1016/j.tws.2026.114526

Changhai Chen , Siyuan Zhou , Yongqing Li

The protective performance of polyurea coated metal plates with various structural configurations under the combined action of air blast and fragments remains insufficiently understood. Additionally, there is a lack of relevant theoretical design methods. These aspects currently impede the widespread application of polyurea materials in the field of protective engineering. In this work, the protective performance of polyurea coated steel (PCS) plates under the combined action of air blast and fragments was compared through experiments and numerical simulations. The damage morphologies and energy absorption characteristics of PCS plates were analyzed, and compared with those of bare steel counterparts and ceramic-steel composite plates of the same total areal densities. The damage mechanisms of polyurea layers were microscopically analyzed. The effects of spraying position of polyurea, thickness allocation, and interface strength on the protective performance of PCS plates were elucidated. A theoretical design method was developed for steel-polyurea composite plates under the combined action of air blast and fragments from the perspective of safety. The results show that PCS plates with polyurea sprayed on the back face of steel layers have better protective performance than those with polyurea sprayed on the front face of steel layers. This is mainly because the rear polyurea layer (RPL) can sufficiently use its hyper-elasticity to enhance the energy absorption capacity of the front steel layer (FSL). PCS plates with suitable thickness allocation between FSL and RPL have superior protective performance compared to bare steel counterparts and ceramic-steel composite plates of the same total areal densities. The thicker FSL, the better protective performance of PCS plate under the same total areal density; this is because FSL is the main energy absorption component in the PCS plate. The proposed theoretical design method is reasonable and accurate, as well as conservative from the safety perspective.

不同结构形态的聚脲包覆金属板在冲击波和破片共同作用下的防护性能研究尚不充分。此外，缺乏相关的理论设计方法。这些方面目前阻碍了聚脲材料在防护工程领域的广泛应用。通过实验和数值模拟，比较了聚脲涂层钢板在空气冲击波和破片共同作用下的防护性能。分析了PCS板的损伤形貌和能量吸收特性，并与相同总面密度的裸钢和陶瓷-钢复合材料板进行了比较。对聚脲层的损伤机理进行了微观分析。研究了聚脲喷涂位置、厚度分配和界面强度对聚氯乙烯板防护性能的影响。从安全角度出发，提出了钢-聚脲复合板在空气爆炸和破片共同作用下的理论设计方法。结果表明，钢层背面喷涂聚脲的PCS板防护性能优于钢层正面喷涂聚脲的PCS板。这主要是因为后聚脲层（RPL）可以充分利用其超弹性来增强前钢层（FSL）的吸能能力。在FSL和RPL之间适当分配厚度的PCS板，与相同总面密度的裸钢板和陶瓷-钢复合板相比，具有更好的防护性能。在相同的总面密度下，FSL越厚，PCS板的防护性能越好；这是因为FSL是PCS板中主要的吸能成分。所提出的理论设计方法合理、准确，但从安全角度来看较为保守。

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引用次数: 0

Mechanics of carbon-fiber sandwich structures with additively-manufactured, polymeric and fiber-reinforced, TPMS metamaterial cores: Experiments and Modeling 碳纤维夹层结构的力学与增材制造，聚合物和纤维增强，TPMS超材料芯：实验和建模

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-12 DOI: 10.1016/j.tws.2026.114480

Brijesh Phullel , Haris Mehraj , Agyapal Singh , Khaled Shahin , Nikolaos Karathanasopoulos

Architected materials have attracted significant interest, primarily due to their unique capabilities in tailoring structural performance beyond conventional design limits. The current contribution investigates the flexural behavior of architected sandwich structures, featuring triply periodic minimal surface (TPMS) cores, and carbon fiber-reinforced polymer (CFRP) face sheets. Two core materials are investigated, namely polymeric and chopped carbon fiber (CF) reinforced 3D-printed cores, each fabricated with diverse TPMS topologies and core densities. Their flexural stiffness, strength, and energy absorption are assessed, identifying distinct mechanical performance differences. CF PPA cores allow for up to three times higher flexural modulus and strength compared to mere polymeric cores of the same density and architecture, approaching 2.5 GPa and 30 MPa, respectively. However, simple polymeric cores offer superior specific energy absorption through ductile, progressive crushing mechanisms, particularly prominent at higher core densities, aspects both experimentally and numerically characterized. Specific energy absorptions exceeding 600 J/kg are recorded for various polymeric core patterns at 30% core density, values twice those recorded for densities of 20%. The established core design and effective structural mechanics correlations provide benchmark results for the engineering of advanced, lightweight sandwich structures with exceptional flexural strength and energy absorption, leveraging cutting-edge additively manufactured metamaterial parts.

建筑材料引起了人们极大的兴趣，主要是因为它们在定制结构性能方面的独特能力超出了传统设计的限制。目前的贡献研究了建筑夹层结构的弯曲行为，包括三周期最小表面（TPMS）芯和碳纤维增强聚合物（CFRP）面板。研究了两种芯材，即聚合物和切碎碳纤维（CF）增强的3d打印芯材，每种芯材都具有不同的TPMS拓扑结构和芯材密度。他们的抗弯刚度，强度和能量吸收进行评估，确定明显的机械性能差异。与相同密度和结构的聚合物岩芯相比，CF PPA岩芯的弯曲模量和强度最高可达三倍，分别接近2.5 GPa和30 MPa。然而，简单的聚合物岩心通过延展性、渐进式破碎机制提供了优越的比能吸收，特别是在高岩心密度时，实验和数值表征方面都很突出。在岩心密度为30%时，各种聚合物岩心模式的比能吸收率均超过600 J/kg，是岩心密度为20%时的两倍。已建立的核心设计和有效的结构力学相关性为先进的轻质夹层结构的工程设计提供了基准结果，该结构具有卓越的抗弯强度和能量吸收，利用尖端的增材制造超材料部件。

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引用次数: 0

Rate-dependent thermoelastic dynamic response of graphene-reinforced composite piezoelectric structures using fractional-order three-phase-lag theory 基于分数阶三相滞后理论的石墨烯增强复合压电结构速率相关热弹性动力响应

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-12 DOI: 10.1016/j.tws.2026.114522

Lingchen Tian , Zehuan Li , Zailin Yang

An innovative fractional-order three-phase-lag (FTPL) thermoelastic framework is formulated for the thermal response of graphene-reinforced piezoelectric composites under sinusoidal heat shock, incorporating strain rate. This framework introduces both strain relaxation and memory-dependent effects into the graphene-reinforced piezoelectric composite material model for the first time, thereby filling the gap in existing theories that cannot accurately predict transient thermal shock processes in extreme environments. Based on this model, an analytical method using the Laplace transform and numerical inversion was employed to solve the thermoelastic dynamic response of graphene-reinforced composite piezoelectric layers. A comparative analysis evaluates the influence of graphene platelets distribution patterns (UD, FG-O, FG-X and FG-A types) on the structural response. In addition, parameter studies have shown that fractional-order parameters, total weight fraction of graphene platelets, strain relaxation factors and time factors are key parameters that affect thermomechanical behavior. This study not only provides a high-order accurate theoretical tool for predicting the coupling behavior of graphene-reinforced piezoelectric composites in transient thermal environments, but also provides a direct theoretical basis and parameter guidance for the material design and optimization of high-performance sensors and actuators.

提出了一种新颖的分数阶三相滞后（FTPL）热弹性框架，用于研究石墨烯增强压电复合材料在正弦热冲击下的热响应，并考虑了应变率。该框架首次将应变松弛效应和记忆依赖效应引入石墨烯增强压电复合材料模型，从而填补了现有理论无法准确预测极端环境下瞬态热冲击过程的空白。基于该模型，采用拉普拉斯变换与数值反演相结合的解析方法求解了石墨烯增强复合压电层的热弹性动力响应。一项比较分析评估了石墨烯血小板分布模式（UD、FG-O、FG-X和FG-A类型）对结构响应的影响。此外，参数研究表明，分数阶参数、石墨烯薄片总重量分数、应变松弛因子和时间因子是影响热力学行为的关键参数。本研究不仅为预测石墨烯增强压电复合材料在瞬态热环境下的耦合行为提供了高阶精度的理论工具，也为高性能传感器和执行器的材料设计与优化提供了直接的理论依据和参数指导。

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