Extreme Mechanics Letters最新文献_第10页

Band gap analysis and prediction for phononic metamaterials with different spiral shapes based on transfer learning 基于迁移学习的不同螺旋形状声子超材料带隙分析与预测

IF 4.3 3区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Extreme Mechanics Letters

Pub Date : 2025-07-22 DOI: 10.1016/j.eml.2025.102379

Majid Kheybari, Hongyi Xu

This study presents a comprehensive computational investigation of band gap characteristics in spiral-based phononic metamaterials, including Archimedean, Octagon, Hexagon, and Square spiral configurations. It offers a quantitative understanding of the similarities in Bloch wave properties across these spiral types and demonstrates the feasibility of using data from known spiral patterns to facilitate the property prediction of new types. Based on the spiral datasets that vary in the number of turns, cutting width, and inner radius, we observed strong correlations in band gap counts among patterns (e.g., Rotated Octagon and Octagon, Archimedean and Rotated Octagon), indicating similar behaviors in band gap occurrence across different geometries. It was also found that the rotation of geometric shapes had a minor impact on band gap counts. However, we observed that the distribution of band gap width varies significantly across different types of spirals, with weak correlations. Furthermore, we demonstrate that transfer learning (TL) enhances prediction accuracy for new spiral types compared to traditional neural network approaches. TL model demonstrated superior performance, effectively capturing complex band gap details and improving overall prediction accuracy, without requiring extensive training data.

本研究对基于螺旋的声子超材料的带隙特性进行了全面的计算研究，包括阿基米德、八边形、六边形和方形螺旋结构。它提供了对这些螺旋型布洛赫波性质相似性的定量理解，并证明了利用已知螺旋型数据促进新类型性质预测的可行性。基于旋转次数、切割宽度和内半径不同的螺旋数据集，我们观察到带隙数量在模式（例如，旋转八边形和八边形，阿基米德和旋转八边形）之间具有很强的相关性，表明不同几何形状的带隙发生相似的行为。还发现几何形状的旋转对带隙数的影响较小。然而，我们观察到带隙宽度的分布在不同类型的螺旋中有显著差异，具有弱相关性。此外，我们证明了与传统的神经网络方法相比，迁移学习（TL）提高了对新螺旋类型的预测精度。TL模型表现出优异的性能，在不需要大量训练数据的情况下，有效地捕获了复杂的带隙细节，提高了整体预测精度。

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引用次数: 0

Modeling the dynamics of sub-millisecond electroadhesive engagement and release times 亚毫秒级电粘合剂接合和释放时间的动力学建模

IF 4.3 3区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Extreme Mechanics Letters

Pub Date : 2025-07-22 DOI: 10.1016/j.eml.2025.102382

Ahad M. Rauf, Sean Follmer

Electroadhesive clutches are electrically controllable switchable adhesives commonly used in soft robots and haptic user interfaces. They can form strong bonds to a wide variety of surfaces at low power consumption. However, electroadhesive clutches in the literature engage to and release from substrates several orders of magnitude slower than a traditional electrostatic model would predict. Large release times, in particular, can limit electroadhesion’s usefulness in high-bandwidth applications. We develop a novel electromechanical model for electroadhesion, factoring in polarization dynamics, the drive circuitry’s rise and fall times, and contact mechanics between the dielectric and substrate. We show in simulation and experimentally how different design parameters affect the engagement and release times of centimeter-scale electroadhesive clutches to metallic substrates, and we find that the model accurately captures the magnitude and trends of our experimental results. In particular, we find that higher drive frequencies, narrower substrate aspect ratios, and faster drive circuitry output stages enable significantly faster release times. The fastest clutches have engagement times less than

15 μ

s and release times less than

875 μ

s, which are 10

\times

and 17.1

\times

faster, respectively, than the best times found in prior literature on centimeter-scale electroadhesive clutches.

电胶离合器是一种可电控的可切换粘合剂，通常用于软机器人和触觉用户界面。它们可以在低功耗下与各种各样的表面形成牢固的键合。然而，文献中的电粘合离合器与基材的接合和释放速度比传统静电模型预测的要慢几个数量级。特别是大的释放时间会限制电粘附在高带宽应用中的实用性。我们开发了一种新的电粘附的机电模型，考虑了极化动力学、驱动电路的上升和下降时间以及介电介质和衬底之间的接触力学。我们在模拟和实验中展示了不同的设计参数如何影响厘米级电粘合离合器与金属基板的接合和释放时间，我们发现该模型准确地捕捉了我们的实验结果的幅度和趋势。特别是，我们发现更高的驱动频率，更窄的衬底宽高比和更快的驱动电路输出级可以显著加快释放时间。最快的离合器啮合时间小于15μs，释放时间小于875μs，分别比现有文献中厘米级电粘合离合器的最佳啮合时间快10倍和17.1倍。

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引用次数: 0

Modeling of magnetic soft catheters in contact with aneurysms 与动脉瘤接触的磁性软导管的建模

IF 4.3 3区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Extreme Mechanics Letters

Pub Date : 2025-07-21 DOI: 10.1016/j.eml.2025.102385

Shah Khalid , Jiyu Li , Han Chen , Longyu Pan , Lidan Tan , Ke Wu , Mingchao Liu , Liu Wang

Magnetic soft catheters (MSCs) represent a breakthrough for remote navigation in minimally invasive endovascular procedures, especially in the coil embolization of cerebral aneurysms. However, current MSC models often neglect the contact interaction between the catheter and the aneurysm boundary during navigation, which limits their real-world use. To address this issue, this paper introduces a detailed theoretical model that considers the magneto-mechanical behavior of MSCs and the contact with aneurysms in endovascular environments. The navigation of MSCs through aneurysms of different shapes, such as circular, elliptic, and rounded-elliptic, is investigated to simulate the various anatomical constraints in clinical practice. We present a numerical framework based on polynomial approximations and weighted residuals to analyze the deflections of MSCs in contact with aneurysms under varying magnetic fields. A parametric analysis further explores the impact of magnetic field strength, magnetic field direction, catheter flexibility, and aneurysm wall shape, allowing adjustments to ensure safe navigation. We also examine how these factors affect MSC’s ability to navigate different aneurysm shapes, offering insights for optimizing design strategies for practical use. The proposed model is validated through finite element method (FEM) simulations and experiments, accurately predicting large deformations of MSCs in contact with aneurysms in endovascular environments. The results provide key guidelines for safely navigating MSCs, thus reducing the risk of incorrect coil placement during embolization and laying a solid foundation for the clinical application of MSCs in endovascular procedures.

磁性软导管（MSCs）代表了微创血管内手术中远程导航的突破，特别是在脑动脉瘤的线圈栓塞中。然而，目前的MSC模型在导航过程中往往忽略导管与动脉瘤边界之间的接触相互作用，这限制了它们在现实世界中的应用。为了解决这一问题，本文介绍了一个详细的理论模型，该模型考虑了MSCs的磁力学行为以及血管内环境中与动脉瘤的接触。研究了MSCs在不同形状的动脉瘤（如圆形、椭圆形和圆椭圆形）中的导航，以模拟临床实践中的各种解剖限制。我们提出了一个基于多项式近似和加权残差的数值框架来分析不同磁场下MSCs与动脉瘤接触时的挠度。参数分析进一步探讨了磁场强度、磁场方向、导管柔韧性和动脉瘤壁形状的影响，以便进行调整以确保安全导航。我们还研究了这些因素如何影响MSC导航不同动脉瘤形状的能力，为优化实际应用的设计策略提供见解。通过有限元模拟和实验验证了该模型的有效性，准确预测了血管内环境中MSCs与动脉瘤接触时的大变形。该结果为MSCs的安全导航提供了关键指导，从而降低了栓塞过程中错误放置线圈的风险，为MSCs在血管内手术中的临床应用奠定了坚实的基础。

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引用次数: 0

Clot treatment via spinning-induced fibrin microstructure densification and clot volume reduction 通过纺丝诱导的纤维蛋白微观结构致密化和凝块体积减小治疗凝块

IF 4.3 3区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Extreme Mechanics Letters

Pub Date : 2025-07-21 DOI: 10.1016/j.eml.2025.102391

Yilong Chang , Guansheng Li , Jay Sim , George Em Karniadakis , Ruike Renee Zhao

Blood clots, composed of red blood cells (RBCs) embedded within a fibrin network, can cause life-threatening conditions such as strokes and heart attacks. However, conventional thrombectomy techniques, such as aspiration or stent retrievers, often struggle with large or tough clots, limiting their clinical efficacy. The recently developed milli-spinner thrombectomy offers a breakthrough approach that fundamentally departs from these traditional methods. Instead of extracting the clot intact, the milli-spinner mechanically shrinks the clot by densifying its microstructure through the combined action of compression and shear forces, achieving up to 95 % volume reduction. This novel clot debulking strategy enables more effective clot removal and holds strong potential for significantly improved clinical outcomes in thrombectomy procedures. To uncover the underlying mechanisms and optimize performance, we combine in vitro experiments with dissipative particle dynamics (DPD) simulations for multiscale analysis of clot volume reduction and microstructural densification under integrated compression and shear. Experiments quantify macroscopic clot volume reduction under controlled loading, while simulations reveal microscale fibrin network densification and RBC release. This systematic study provides a quantitative understanding of how different loading modes alter clot microstructure across clot types. These findings lay the foundation for the rational design of next-generation thrombectomy systems, capable of mechanically reconfiguring clot microstructure in situ, offering enhanced efficacy and broader clinical applicability.

血凝块是由嵌在纤维蛋白网络中的红血球（rbc）组成的，可导致危及生命的疾病，如中风和心脏病发作。然而，传统的取栓技术，如抽吸或支架回收，往往与大的或坚硬的血栓作斗争，限制了它们的临床疗效。最近开发的微旋血栓切除术提供了一种突破性的方法，从根本上脱离了这些传统方法。与完整提取凝块不同的是，微纺丝机通过压缩和剪切力的共同作用使其微观结构致密化，从而使凝块机械收缩，体积减少高达95% %。这种新颖的凝块减容策略能够更有效地去除凝块，并具有显著改善血栓切除术临床结果的强大潜力。为了揭示潜在的机制并优化性能，我们将体外实验与耗散粒子动力学（DPD）模拟相结合，对综合压缩和剪切作用下的凝块体积缩小和微观结构致密化进行了多尺度分析。实验量化了控制负荷下宏观的血块体积减少，而模拟揭示了微观尺度的纤维蛋白网络致密化和红细胞释放。这个系统的研究提供了一个定量的了解不同的加载模式如何改变凝块的微观结构跨越凝块类型。这些发现为下一代取栓系统的合理设计奠定了基础，该系统能够在原位机械地重新配置凝块微观结构，从而提高疗效和更广泛的临床适用性。

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引用次数: 0

Front cover CO1 前盖CO1

IF 4.3 3区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Extreme Mechanics Letters

Pub Date : 2025-07-16 DOI: 10.1016/S2352-4316(25)00099-9

引用次数: 0

Influence of strain-rate on the response of elastomeric architected materials 应变率对弹性体结构材料响应的影响

IF 4.3 3区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Extreme Mechanics Letters

Pub Date : 2025-07-15 DOI: 10.1016/j.eml.2025.102389

Brianna MacNider , Dana M. Dattelbaum , Nicholas Boechler , Carl Cady , Benjamin K. Derby , Saryu Fensin , Kwan-Soo Lee , Jihyeon Kim , Sushan Nakarmi , Nitin Daphalapurkar

Architected materials have shown substantial promise in impact mitigation and protective applications, and there has accordingly been great interest in better characterizing their response at elevated strain rates due to impact. There remains ambiguity regarding the contribution of inertial and material responses to strain rate sensitivity, and, in particular, when these effects begin to gain dominance in the impact response of an architected material. The response of soft polymer architected materials as a function of strain rate, in particular, has been little investigated. We characterize the experimental impact response of four soft polymer architected lattice geometries across varying strain rates in the intermediate strain rate regime (∼10³ s⁻¹) using split-Hopkinson pressure bar loading and high speed video characterization of the resulting deformation fields. Our results highlight the interplay of influence between constituent material, lattice geometry, length scale, and strain rate in determining the onset of significant inertia effects.

建筑材料在冲击缓解和防护应用方面显示出巨大的前景，因此，人们对更好地表征它们在冲击引起的高应变率下的响应非常感兴趣。关于惯性和材料响应对应变率灵敏度的贡献，特别是当这些影响开始在结构材料的冲击响应中占据主导地位时，仍然存在不确定性。特别是软聚合物建筑材料的响应作为应变速率的函数，很少被研究。我们利用劈裂霍普金森压力杆加载和由此产生的变形场的高速视频表征，表征了四种软聚合物结构的晶格几何形状在不同应变速率下（~ 103 s−1）的实验冲击响应。我们的研究结果强调了组成材料、晶格几何形状、长度尺度和应变速率之间的相互影响，这些影响决定了显著惯性效应的开始。

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引用次数: 0

3D-printed silica glass micro-mechanical device (MMD) for in situ mechanical testing 用于现场机械测试的3d打印硅玻璃微机械装置（MMD）

IF 4.3 3区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Extreme Mechanics Letters

Pub Date : 2025-07-10 DOI: 10.1016/j.eml.2025.102384

Ziyong Li , Yanwen Jia , Fang Su , Juzheng Chen , Xiewen Wen , Wenjun Liang , Hao Wu , Yang Lu

Micro-electro-mechanical systems (MEMS)-based devices offers a premium solution for versatile in situ micro-/nano- mechanical characterizations of low-dimensional materials, however, they are primarily manufactured using costly top-down silicon photolithography microfabrication processes. Previously, we demonstrated that high-resolution bottom-up 3D printing technologies can be used for printing such micro-mechanical device (MMD), but those photopolymer-based devices are of low-modulus and less stable for long-term use. Here, based on our recently developed high-resolution glass 3D printing technique, we show that silica glass MMD with high definition and performance. The versatility of high-resolution additive manufacturing, combined with the long-term mechanical stability as well as exceptional mechanical properties of high-performance glass, enables the fabrication of MMDs with more desirable characteristics. This facilitates the in-situ micro-/nano- mechanical characterizations on novel materials. The tensile behaviors of microfibers and nanofilms, as demonstrated by our developed MMDs, showcase the potential for a groundbreaking approach to in situ micro-/nano- mechanical testing through the integration of 3D printing, high-performance glass, and MEMS technologies.

基于微机电系统（MEMS）的器件为低维材料的多用途原位微/纳米机械表征提供了一种优质的解决方案，然而，它们主要是使用昂贵的自上而下硅光刻微加工工艺制造的。此前，我们证明了高分辨率自下而上的3D打印技术可用于打印此类微机械设备（MMD），但这些基于光聚合物的设备具有低模量且长期使用不太稳定。在这里，基于我们最近开发的高分辨率玻璃3D打印技术，我们展示了具有高清晰度和高性能的二氧化硅玻璃MMD。高分辨率增材制造的多功能性，加上高性能玻璃的长期机械稳定性和卓越的机械性能，使mmd的制造具有更理想的特性。这有助于对新材料进行原位微/纳米力学表征。正如我们开发的mmd所展示的那样，微纤维和纳米膜的拉伸行为展示了通过3D打印、高性能玻璃和MEMS技术的集成，为原位微/纳米机械测试提供开创性方法的潜力。

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引用次数: 0

A novel mechanical criterion and interpretation for dual stress plateau phenomenon in NiTi alloy under tension 张力作用下NiTi合金双应力平台现象的新力学判据及解释

IF 4.3 3区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Extreme Mechanics Letters

Pub Date : 2025-07-07 DOI: 10.1016/j.eml.2025.102380

Xi Qie, Jianping Lin

Numerous studies have investigated Lüders band and transformation stress plateau in NiTi. However, localized plastic deformation (LPD) of martensite and the stress drop before the second stress plateau remain poorly understood. In this study, drawing an analogy to Lüders band propagation, we observed LPD band nucleation propagation in a microstructure with 253 nm grain size by in-situ Digital Image Correlation (DIC). Based on displacement conservation, we propose a mechanical criterion for inelastic loading in NiTi. This criterion accurately predicts the stress drop associated with LPD band nucleation and movement, providing a theoretical foundation. Furthermore, we systematically explain, for the first time, the abnormal strain softening effect responsible for the second stress plateau during martensitic plastic deformation. By offering new insights into martensitic transformation and LPD mechanisms, this research advances the understanding of dual stress plateaus and LPD in NiTi.

大量研究对镍钛中的 ders带和相变应力平台进行了研究。然而，马氏体的局部塑性变形（LPD）和第二次应力平台前的应力降仍不清楚。在本研究中，我们通过原位数字图像相关（DIC）技术，类比LPD波段的传播，观察了253 nm晶粒尺寸的微观结构中LPD波段的形核传播。在位移守恒的基础上，提出了NiTi非弹性载荷的力学判据。该判据准确预测了与LPD带形核和运动相关的应力降，为LPD带形核和运动提供了理论依据。此外，我们首次系统地解释了马氏体塑性变形过程中导致第二次应力平台的异常应变软化效应。通过对马氏体相变和LPD机制的新认识，本研究推进了对NiTi双应力平台和LPD的认识。

引用次数: 0

Full-field strain distribution in non-arthritic and arthritic glenoid bones before and after implant placement measured by digital volume correlation method 用数字体积相关法测量假体置入前后非关节炎和关节炎关节盂骨的全场应变分布

IF 4.3 3区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Extreme Mechanics Letters

Pub Date : 2025-07-04 DOI: 10.1016/j.eml.2025.102377

Po-Ting Lin , Congyuan Zhang , Yichun Tang , Hanwen Fan , Kaleb Barker , Nathan Harward , Ecem Kilic , Zachary Rickmeyer , Gregory S. Lewis , April D. Armstrong , Jing Du , Yuxiao Zhou

Loosening of the shoulder joint (glenohumeral joint) implant is a leading cause of failure in total shoulder replacement surgery, primarily due to mechanical strain concentration in the bone. This study combines in situ mechanical testing with micro-X-ray computed tomography (micro-CT) to apply physiologically realistic loads on non-arthritic and arthritic glenoid bones, the socket portion of the shoulder joint, before and after implant placement, and uses digital volume correlation (DVC) to analyze 3D deformation and strain distributions within the glenoid bones. The results show that degenerative changes in bone quality and structure associated with different arthritis subtypes redistribute strain under anterior and posterior eccentric loading. Strain distributions were compared across arthritis subtypes before and after implant placement, with results indicating that implant placement often helps alleviate strain concentrations. Additionally, the percentage of bone volume experiencing strain beyond the physiological strain range typically encountered during daily activities was assessed. While the proportion of bone exceeding this strain threshold was comparable between non-arthritic and arthritic glenoid bones post-implantation, strain magnitude was notably higher in arthritic specimens, potentially increasing the risk of implant loosening. These findings provide insights for optimizing preoperative planning and implant design tailored to patient-specific bone characteristics, potentially enhancing implant longevity and reducing the risk of post-surgical loosening in patients with glenohumeral arthritis.

肩关节（盂肱关节）假体松动是全肩关节置换术失败的主要原因，主要是由于骨中的机械应变集中。本研究将原位力学测试与微x射线计算机断层扫描（micro-CT）相结合，在植入假体之前和之后对无关节炎和关节炎的肩关节窝部分施加生理上真实的载荷，并使用数字体积相关（DVC）分析肩关节内的三维变形和应变分布。结果表明，不同关节炎亚型的骨质量和结构的退行性改变在前后偏心负荷下重新分配了应变。我们比较了植入前后不同关节炎亚型的应变分布，结果表明植入通常有助于缓解应变浓度。此外，还评估了在日常活动中通常遇到的超出生理应变范围的骨体积的百分比。虽然超过该应变阈值的骨比例在植入后非关节炎和关节炎关节盂骨之间是相当的，但关节炎标本的应变值明显更高，潜在地增加了植入物松动的风险。这些发现为优化术前计划和针对患者特定骨特征量身定制的植入物设计提供了见解，有可能提高植入物的使用寿命，降低肩关节关节炎患者术后松动的风险。

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引用次数: 0

Harnessing nonlocal coupling effect to enhance broadband sound insulation in gradient acoustic metamaterial 利用非局部耦合效应增强梯度声学超材料的宽带隔声性能

IF 4.3 3区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Extreme Mechanics Letters

Pub Date : 2025-06-25 DOI: 10.1016/j.eml.2025.102376

Zhonggang Wang , Xinying Lu , Yiming Zhao , Kexin Zeng , Ziping Lei , Tiecheng Wang , Zhendong Li , Zichao Guo

While local-resonance acoustic metamaterials with parallel arrangements provide a feasible means for subwavelength control of sound waves, their practical applications are severely limited by the presence of multiple insulation valleys between the resonance effects. A new design framework for gradient-channel acoustic metamaterials is introduced by harnessing the nonlocal coupling effect. This mechanism strengthens the interaction between adjacent unit cells, with nonlocal regions acting as secondary acoustic sources. Consequently, phase cancellation is extended throughout the metamaterial, eliminating significant sound insulation valleys. Our theoretical, numerical, and experimental investigations reveal that the proposed nonlocal metamaterial enhances sound insulation by 15.8 % over the 400–2500 Hz range compared to conventional parallel metamaterials at the deep-subwavelength scale. Furthermore, a bilayer metamaterial, combining local and nonlocal designs, achieves an average sound transmission loss of 32.8 dB. By exploiting the nonlocal effect, this work significantly expands the design space for multi-channel acoustic metamaterials, enabling efficient manipulation of low-frequency waves over a wide bandwidth. It provides a novel route for developing ultrathin, high-efficiency sound insulators.

平行排列的局部共振声学超材料为声波的亚波长控制提供了可行的手段，但其实际应用受到共振效应之间存在多个绝缘谷的严重限制。利用非局部耦合效应，提出了一种新的梯度通道声学超材料设计框架。这种机制加强了相邻单元细胞之间的相互作用，非局部区域作为次要声源。因此，相位抵消在整个超材料中得到扩展，消除了显著的隔音谷。我们的理论、数值和实验研究表明，在400-2500 Hz范围内，与传统平行超材料相比，所提出的非局部超材料在深亚波长范围内的隔音性能提高了15.8 %。此外，结合局部和非局部设计的双层超材料的平均声传输损失为32.8 dB。通过利用非局域效应，这项工作极大地扩展了多通道声学超材料的设计空间，使低频波在宽带宽上的有效操纵成为可能。为超薄高效隔声材料的研制提供了一条新的途径。

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引用次数: 0