International Journal of Mechanical Sciences最新文献

英文中文

Global-to-local control of interface and corner states 接口和拐角状态的全局到局部控制

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-15 Epub Date: 2026-02-06 DOI: 10.1016/j.ijmecsci.2026.111358

Jiao Wang , Nan Gao , Weiqiu Chen

Topologically protected interface states (ISs) exhibit inherent robustness, maintaining stable wave propagation under local perturbations. While this robustness guarantees stability, it also poses challenges for active control. Here, we propose a design strategy that integrates global configuration tuning with local interface reconfiguration to manipulate ISs and higher-order topological corner states (HOTCSs) in two-dimensional (2D) acoustic metamaterials. Global modulation reconfigures the entire structure to adjust interface bandwidths and control the presence of HOTCSs. In contrast, localized reconfiguration modifies only the interface region while preserving the global structure, enabling precise tuning of interface-state frequencies and selective excitation or suppression of corner states (CSs). Incorporating localized modulation regions into finite structures establishes a versatile framework for wave control, including arbitrary output positioning and asymmetric transmission at fixed frequencies under opposite excitations. Finite-element simulations (FES) validate the effectiveness of this approach, demonstrating its potential for highly flexible wave manipulation in topological acoustic systems. These results establish a general design framework for tunable and reconfigurable acoustic systems with controllable ISs and CSs.

拓扑保护界面态（ISs）表现出固有的鲁棒性，在局部扰动下保持稳定的波传播。虽然这种鲁棒性保证了稳定性，但也给主动控制带来了挑战。在这里，我们提出了一种集成全局配置调整和局部界面重构的设计策略，以操纵二维声学超材料中的ISs和高阶拓扑角态（HOTCSs）。全局调制重新配置整个结构来调整接口带宽和控制HOTCSs的存在。相比之下，局部重构只修改界面区域，同时保留全局结构，从而能够精确调整界面状态频率和选择性激发或抑制角态（CSs）。将局部调制区域整合到有限结构中，建立了波控制的通用框架，包括任意输出定位和在相反激励下固定频率下的不对称传输。有限元模拟（FES）验证了这种方法的有效性，展示了其在拓扑声学系统中高度灵活的波操纵的潜力。这些结果建立了可调和可重构声学系统的总体设计框架。

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引用次数: 0

Transient thermal behaviour of a wet clutch using multi-body dynamics 基于多体动力学的湿式离合器瞬态热特性研究

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-15 Epub Date: 2026-02-06 DOI: 10.1016/j.ijmecsci.2026.111337

Zhiqiang Zhao , Heyun Bao , Zouhao Song , Fengxia Lu , Shanshan Liu

The pressure–temperature–time history is crucial for operating precision and service life of a wet clutch under high energy levels. However, there still lacks a simple and accurate model to predict the contact heat transfer at the sliding friction interface during the rotation-axial engagement process. In this paper, a transient thermal analysis of a multi-disc wet clutch is performed to capture the heat transfer behaviour of a sliding friction pair during the entire engagement cycle. The thermal conditions of the clutch are formulated by the dynamic model of a multi-body system considering the coupled effects of hydrodynamic lubrication, asperity contact, squeeze motion and sliding motion. The temperature characteristics of the clutch discs are investigated in detail by utilizing the thermal contact conductance under squeeze-sliding conditions. The peak temperatures of separator disc and friction lining are influenced by various applied pressures, material properties and load torques. As the applied pressure increases from 1.0 MPa to 1.6 MPa, the peak temperatures of the separator disc and friction lining are predicted to increase by 35.6% and 40.3%, respectively. When the load torque increases from 0 N m to 300 N m, the highest temperature of separator disc and friction lining increase by 16.3% and 15.8%, respectively. The developed thermal model could be a practicable toolkit for forecasting the temperature of a wet clutch under complex operating conditions.

压力-温度-时间历史对高能量水平下湿式离合器的操作精度和使用寿命至关重要。然而，目前还缺乏一种简单准确的模型来预测旋转-轴向接触过程中滑动摩擦界面处的接触换热。本文对多片湿离合器进行了瞬态热分析，以捕捉滑动摩擦副在整个接合周期中的传热行为。考虑流体动力润滑、粗糙接触、挤压运动和滑动运动的耦合效应，采用多体系统动力学模型建立了离合器的热工况。利用接触热导对离合器盘在挤压滑动条件下的温度特性进行了详细的研究。分离盘和摩擦衬的峰值温度受各种施加压力、材料性能和载荷扭矩的影响。当施加压力从1.0 MPa增加到1.6 MPa时，分离盘和摩擦衬的峰值温度分别升高35.6%和40.3%。负载转矩从0 N m增加到300 N m时，分离盘和摩擦衬的最高温度分别提高了16.3%和15.8%。所建立的热模型可作为预测复杂工况下湿式离合器温度的实用工具。

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引用次数: 0

Ultimate tensile strength of atomic layer deposited Al2O3 nanofilms 原子层沉积Al2O3纳米膜的极限拉伸强度

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-15 Epub Date: 2026-02-04 DOI: 10.1016/j.ijmecsci.2026.111355

Kia Dastani , Mohammad R. Movahhedy , Saeed Khodaygan , Micheal Yu Wang , Hongyu Yu

The fracture properties of atomic layer deposited (ALD) Al₂O₃ remain poorly studied despite their growing importance in multifunctional nanolattices and nanoscale devices. Only a few studies have reported the ultimate tensile strength of ALD Al₂O₃, with values ranging widely from 0.43 to 4.2 GPa, making it difficult to identify a representative value. To address this research gap, the present study focuses on the fracture strength of ALD Al₂O₃. Specifically, we fabricated circular free‑standing Al₂O₃ nanofilms with thicknesses of 50 nm and 100 nm, deposited at 200 °C and 300 °C, and subjected them to deflection using a conospherical nanoindentation tip until fracture. This experimental approach has not been previously reported for mechanical characterization of thin films. The ultimate tensile strength estimated in the present work is significantly higher than values reported in prior studies. This discrepancy is primarily attributed to inadequate stress analysis in earlier works, as explained in detail in the manuscript. Furthermore, the applicability and validity of the present results are carefully examined and discussed.

尽管原子层沉积（ALD） Al2O3在多功能纳米晶格和纳米级器件中越来越重要，但对其断裂性能的研究仍然很少。只有少数研究报道了ALD Al2O3的极限抗拉强度，其值范围从0.43到4.2 GPa，很难确定一个具有代表性的值。为了解决这一研究空白，本研究将重点放在ALD Al2O3的断裂强度上。具体来说，我们制作了厚度为50 nm和100 nm的圆形独立Al2O3纳米膜，分别在200°C和300°C下沉积，并使用锥形纳米压痕尖端使其偏转直至断裂。这种实验方法以前没有报道过薄膜的机械特性。本研究估计的极限抗拉强度明显高于先前研究报告的值。这种差异主要是由于早期工作中的应力分析不足，如手稿中详细解释的那样。此外，本文还对所得结果的适用性和有效性进行了仔细的检验和讨论。

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引用次数: 0

A miniaturized 2-DOF piezoelectric rotary platform for low-power and high-bandwidth 一种低功耗、高带宽的小型化二自由度压电旋转平台

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-15 Epub Date: 2026-02-09 DOI: 10.1016/j.ijmecsci.2026.111372

Jinghan Guan , Shijing Zhang , Jie Deng, Junkao Liu, Yingxiang Liu

Two-degree-of-freedom (2-DOF) piezoelectric rotary platforms enable high-precision angle, ideal for attitude adjustment applications. However, robotic and aerospace demand smaller size and lower power consumption. This work proposes a different actuation approach from existing platforms and develops a rotary platform. It achieves 2-DOF rotation by integrating a compliant mechanism with a single sandwich-type bending piezoelectric actuator (BPA). The BPA consists of four independently segmented piezoelectric ceramics and generates orthogonal bending motions using two voltage signals. Its capacitance is 8 nF, and it incorporates a displacement-amplifying horn. This enables large output angles while maintaining low power consumption. A theoretical model is developed to describe the transmission of the actuator bending displacement to the elastic deformation of the compliant mechanism, showing strong agreement with finite element analysis. Experimental results show that the platform achieves a rotational stroke of 2.6 mrad and exhibits good linearity. Its resolution can reach 0.27 μrad. Its first natural frequency is 8571 Hz, and the operational bandwidth under load reaches 3604 Hz. Its miniaturization is reflected in a weight of 50 g and dimensions of Φ24 mm × 32.2 mm. It is demonstrated that miniaturization, low power consumption, and high bandwidth enhance its application potential in attitude adjustment systems.

两自由度（2-DOF）压电旋转平台可实现高精度角度，是姿态调整应用的理想选择。然而，机器人和航空航天需要更小的尺寸和更低的功耗。这项工作提出了一种不同于现有平台的驱动方法，并开发了一个旋转平台。它通过集成一个柔性机构和一个三明治式弯曲压电驱动器（BPA）来实现2自由度旋转。双酚a由四个独立分段的压电陶瓷组成，利用两个电压信号产生正交弯曲运动。它的电容为8nf，并包含一个位移放大喇叭。这使得大的输出角度，同时保持低功耗。建立了执行机构弯曲位移对柔性机构弹性变形传递的理论模型，与有限元分析结果吻合较好。实验结果表明，该平台的旋转行程为2.6 mrad，具有良好的线性性。其分辨率可达0.27 μrad。第一固有频率为8571 Hz，负载下工作带宽达到3604 Hz。其小型化体现在50克的重量和Φ24毫米 × 32.2毫米的尺寸上。结果表明，该方法具有小型化、低功耗、高带宽等优点，在姿态调整系统中具有较大的应用潜力。

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引用次数: 0

Thermal-dynamic coupling analysis of bearings: A continuous-discrete-jump iterative algorithm 轴承热动力耦合分析：连续-离散-跳跃迭代算法

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-15 Epub Date: 2026-02-10 DOI: 10.1016/j.ijmecsci.2026.111376

Bowen Liu, Yifan Huangfu, Juanjuan Shi, Jun Wang, Weiguo Huang, Zhongkui Zhu

Tapered roller bearing rotor systems are widely employed in rotating machinery, yet prolonged high-speed operation often causes localized temperature rise and abnormal vibrations, compromising stability. Traditional studies, focusing separately on thermal or dynamic analyses, fail to capture the inherent thermal-dynamic coupling behaviors. To address this limitation, this study develops a bidirectionally coupled thermal-dynamic model that integrates a bearing rotor dynamic model with an enhanced thermal network considering transient rib heat sources. Thermal expansion and lubrication affect radial clearances, which in turn mediates the interaction between the thermal and dynamic subsystems, thereby forming a closed-loop coupling. To efficiently solve the strongly coupled model, a novel continuous-discrete-jump (CDJ) iterative algorithm through isothermal updating is proposed, delivering substantial computational efficiency without sacrificing accuracy. Experimental validation demonstrates improved prediction of both temperature rise and vibration responses compared with uncoupled models. Parametric analysis further reveals that negative initial radial clearances substantially increase the risk of thermal failure, thereby reducing system reliability.

圆锥滚子轴承转子系统广泛应用于旋转机械，但长时间高速运行往往会引起局部温升和异常振动，影响稳定性。传统的研究，分别关注热分析或动力分析，未能捕捉固有的热动力耦合行为。为了解决这一限制，本研究开发了一个双向耦合的热力学模型，该模型将轴承转子动力学模型与考虑瞬态肋热源的增强热网络集成在一起。热膨胀和润滑影响径向间隙，进而调节热子系统和动力子系统之间的相互作用，从而形成闭环耦合。为了高效求解强耦合模型，提出了一种基于等温更新的连续-离散-跳跃（CDJ）迭代算法，在不牺牲精度的前提下提高了计算效率。实验验证表明，与不耦合模型相比，该模型对温升和振动响应的预测都有所改善。参数分析进一步表明，负的初始径向间隙大大增加了热失效的风险，从而降低了系统的可靠性。

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引用次数: 0

3D in-situ X-CT characterization of anisotropic damage in glass-fiber–reinforced polypropylene 玻璃纤维增强聚丙烯各向异性损伤的三维原位X-CT表征

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-15 Epub Date: 2026-02-10 DOI: 10.1016/j.ijmecsci.2026.111368

Ce Xiao , Qiang Chen , Haoming Zhang , Haoming Luo , Zun Yin , Jun Ren , Zhonghuai Su

Glass fiber-reinforced thermoplastics exhibit strong anisotropy due to fiber alignment induced by injection molding. This study develops an experiment-informed framework to interpret damage initiation and evolution by coupling quasi-static tensile testing inside an X-ray tomograph with digital volume correlation (DVC) and microstructure-informed finite element modeling. Longitudinal and transverse specimens were imaged at multiple strain levels. A U-Net model segmented fibers, voids, and matrix, enabling quantitative analysis of fiber orientation tensors and length distributions, which were then used to construct periodic representative volume elements (RVEs) with cohesive interfaces. DVC linked localized strain fields to damage behavior. Macroscopically, the longitudinal specimens exhibited higher tensile strength and elongation than the transverse ones, attributed to differences in fiber orientation. In-situ 3D observations revealed orientation-specific failure mechanisms: transverse specimens were dominated by interfacial debonding and planar cracking, while longitudinal specimens exhibited fiber pull-out and fracture. CT-informed statistical periodic RVEs reproduced the macroscopic stress–strain responses in both orientations and localized cohesive stresses at fiber ends, consistent with shear-lag theory and critical fiber length predictions. This work provides a mechanistic and orientation-resolved understanding of failure in PP-GF30, and demonstrates a closed-loop structure–simulation–performance workflow applicable to injection-molded short fiber composites.

玻璃纤维增强热塑性塑料由于注射成型引起的纤维排列而表现出很强的各向异性。本研究开发了一个实验信息框架，通过将x射线断层摄影仪内的准静态拉伸测试与数字体积相关（DVC）和微结构信息有限元建模相结合，来解释损伤的发生和演变。纵向和横向标本在多个应变水平下成像。U-Net模型对纤维、空隙和基体进行了分段，可以定量分析纤维取向张量和长度分布，然后利用这些数据构建具有内聚界面的周期性代表性体积单元（RVEs）。DVC将局部应变场与损伤行为联系起来。宏观上，由于纤维取向的差异，纵向试样的抗拉强度和伸长率高于横向试样。现场三维观察揭示了定向破坏机制：横向试样以界面剥离和平面开裂为主，纵向试样以纤维拉出断裂为主。ct统计周期RVEs重现了取向和纤维末端局部内聚应力的宏观应力-应变响应，与剪切滞后理论和临界纤维长度预测一致。这项工作为PP-GF30的失效提供了机制和方向解决的理解，并展示了适用于注塑短纤维复合材料的闭环结构-模拟-性能工作流。

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引用次数: 0

Peridynamic modeling of impact induced electrochemical degradation in all-solid-state batteries 全固态电池冲击诱导电化学降解的全动力学建模

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-15 Epub Date: 2026-02-07 DOI: 10.1016/j.ijmecsci.2026.111328

Zhewen Zhang, Xiaoxun Li, Sheng Qian, Youlin Zhu, Lianfu Qiu, Xiaofei Wang, Qi Tong

The emerging all-solid-state batteries (ASSBs) hold significant promise for next-generation energy storage, yet their mechanical reliability under dynamic impact loading remains a critical challenge. During service, external dynamic loads with high strain rates can induce excessive crack propagation and catastrophic failure, posing substantial risks to structural integrity and electrochemical performance. This study establishes a multiphysics-coupled framework to investigate the dynamic fracture mechanisms within the composite cathode of ASSBs under impact conditions by integrating chemo-mechanical interactions. The model incorporates a bond-based peridynamic framework for active materials (AM), an interface model couples the electrochemical parameters governing charging processes, and a Johnson–Cook (JC) constitutive model for bond-type interactions in the solid electrolytes (SE) to characterize the strain rate-dependent behavior. We systematically investigate the effects of strain rate-dependent impact loading on fracture propagation modes and electrochemical performance degradation in composite cathode. The findings elucidate the multi-physics failure mechanisms under dynamic loading scenarios, providing critical insights for designing next-generation solid-state batteries with enhanced mechanical integrity and safety.

新兴的全固态电池（assb）在下一代储能领域具有重要前景，但其在动态冲击载荷下的机械可靠性仍然是一个关键挑战。在使用过程中，高应变率的外部动载荷会导致过度裂纹扩展和灾难性破坏，对结构完整性和电化学性能构成重大风险。本研究建立了一个多物理场耦合框架，通过整合化学-力学相互作用来研究冲击条件下assb复合阴极内部的动态断裂机制。该模型结合了基于键的活性材料周动力学框架（AM），耦合电化学参数控制充电过程的界面模型，以及固体电解质（SE）中键型相互作用的Johnson-Cook （JC）本构模型，以表征应变速率相关的行为。本文系统地研究了应变速率相关的冲击载荷对复合阴极断裂扩展模式和电化学性能退化的影响。研究结果阐明了动态负载下的多物理场失效机制，为设计具有更高机械完整性和安全性的下一代固态电池提供了重要见解。

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引用次数: 0

Modelling framework for wheel–rail contact temperature evolution during braking 制动过程轮轨接触温度演变的建模框架

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-15 Epub Date: 2026-02-05 DOI: 10.1016/j.ijmecsci.2026.111345

Yifan Yang , Qiuyong Tian , Claudio Colao , Shiqian Chen , Kaiyun Wang , Markus Hecht

Excessive frictional heat generated at the wheel–rail (WR) interface during braking is a primary cause of thermally induced damage and remains a persistent challenge for railway maintenance and safety. This study presents a comprehensive framework for simulating the evolution of WR contact temperature. The approach integrates: (i) a three-dimensional wagon–track interaction model that captures dynamic axle load transfer, (ii) an elastoplastic contact finite element (FE) model with a refined stress reconstruction method, (iii) a novel formulation for the temperature-dependent friction coefficient, and (iv) a pressure-dependent thermal conductance that effectively eliminates numerical singularities. These elements are integrated with a high-efficiency thermal FE model, whose accuracy and physical reliability are validated through comparisons with a transient thermomechanical FE model and field-observed damage patterns. The results reveal a strong positive correlation between creepage and maximum wheel temperature, a highly nonlinear temperature increase during wheel lock-up, and thermal asymmetry during cooling due to enhanced heat conduction on the flange side. The proposed framework can serve as an efficient and extensible tool for wheel thermal response analysis during braking, providing a reliable basis for braking performance evaluation and thermal damage prevention.

制动过程中轮轨界面产生的过多摩擦热是热致损伤的主要原因，也是铁路维护和安全的长期挑战。本研究提出了一个全面的框架来模拟WR接触温度的演变。该方法集成了：(i)捕获动态轴载传递的三维货车-轨道相互作用模型，（ii）具有精细应力重建方法的弹塑性接触有限元（FE）模型，（iii）温度相关摩擦系数的新公式，以及（iv）有效消除数值奇点的压力相关热导。这些元素与高效的热有限元模型相结合，通过与瞬态热力学有限元模型和现场观察的损伤模式的比较，验证了其准确性和物理可靠性。结果表明，漏电与车轮最高温度、车轮闭锁期间的高度非线性温度升高以及由于凸缘侧热传导增强而导致的冷却过程中的热不对称性之间存在很强的正相关关系。该框架可作为一种高效、可扩展的制动过程车轮热响应分析工具，为制动性能评价和热损伤预防提供可靠依据。

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引用次数: 0

Modeling and active control of C-shaped rods with variable-carbon-fiber-path 变碳纤维路径c形杆的建模与主动控制

IF 7.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-14 DOI: 10.1016/j.ijmecsci.2026.111506

Xuedong Sun, Wei Sun, Shang Lv, Haitao Luo, Hui Zhang, Yu Zhang

引用次数: 0

Nonlinear Equivalent Circuit Modeling of Bistable Piezoelectric Energy Harvesters 双稳压电能量采集器的非线性等效电路建模

IF 7.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-14 DOI: 10.1016/j.ijmecsci.2026.111510

Mehmet Simsek, Javad Rahimi, Amirreza Aghakhani, Ipek Basdogan

引用次数: 0

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