Acta Mechanica Sinica最新文献_第2页

Effect of adhesive layer performance on the impact of brittle projectile on B4C ceramic composite armor 粘接层性能对脆性弹丸对B4C陶瓷复合装甲冲击的影响

IF 4.6 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-08-26 DOI: 10.1007/s10409-024-24633-x

Minghui Ma (, ), Yiding Wu (, ), Yilei Yu (, ), Wencheng Lu (, ), Lizhi Xu (, ), Guangfa Gao (, )

{"title":"Effect of adhesive layer performance on the impact of brittle projectile on B4C ceramic composite armor","authors":"Minghui Ma \u0000 (, ), Yiding Wu \u0000 (, ), Yilei Yu \u0000 (, ), Wencheng Lu \u0000 (, ), Lizhi Xu \u0000 (, ), Guangfa Gao \u0000 (, )","doi":"10.1007/s10409-024-24633-x","DOIUrl":"10.1007/s10409-024-24633-x","url":null,"abstract":"<div><p>This paper uses experimental and numerical methods to explore the relationship between the strength, thickness, and failure modes of the adhesive layer and the ballistic performance of ceramic/metal composite armor. Damage of the adhesive layer under dynamic impact was modeled using the ABAQUS and the cohesive zone modeling approach, and analyzing the dynamic responses of the projectile, ceramic, and backplate. The results show that as the bonding strength of the adhesive increases, the extent of projectile fracture damage generally increases, enhancing the overall ballistic performance of the composite armor. However, the final protective performance is also influenced by the evolution of projectile damage. When the thickness of the adhesive increases, the ballistic efficiency of the ceramic initially increases and then decreases. This is due to the thicker adhesive layer extending the projectile’s dwell time while excessive thickness causes premature failure of the ceramic. Additionally, the adhesive mainly undergoes shear failure near the impact point, with the damage extending outward in a circular pattern. When the proportion of tensile failure in the adhesive layer is higher, the composite armor exhibits better ballistic performance. For the impact of a T12A steel projectile, the optimal adhesive strength and thickness for better ballistic performance are respectively 80 MPa and 0.8 mm.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 8","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144920529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Voltage-induced graphene blister — a theoretical analysis 电压诱导的石墨烯水泡——理论分析

IF 4.6 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-08-25 DOI: 10.1007/s10409-024-24283-x

Yajie Yang (, ), Sergii Pud, Jan C. T. Eijkel, Yanbo Xie (, )

{"title":"Voltage-induced graphene blister — a theoretical analysis","authors":"Yajie Yang \u0000 (, ), Sergii Pud, Jan C. T. Eijkel, Yanbo Xie \u0000 (, )","doi":"10.1007/s10409-024-24283-x","DOIUrl":"10.1007/s10409-024-24283-x","url":null,"abstract":"<div><p>Suspended graphene nanopores are widely used in nanofluidic devices, as the machined graphene defects can be downscaled to the angstrom scale. Our recent experimental results showed that the suspended graphene can become delaminated from the edges of SiN nanopore under an applied electrical field, theoretical understanding of this process is still lacking. In this work, we analytically studied the voltage-induced blistering of suspended graphene using an energy approach. The external electric field induces accumulation of ions at the graphene-electrolyte interface, causing Maxwell stress resulting in bending and stretching of the graphene and blister formation. We theoretically derived the angle of the graphene blister to the SiN nanopore by energy approach. We found that once the vertical component of the Maxwell stress on the graphene at the perimeter of SiN nanopore exceeds the van der Waals force between the graphene and substrate, the graphene starts to detach from the edges of SiN nanopore. We derived that the threshold voltage of single-layer graphene detachment is in order of 100 mV, which needs to be cautioned for electrical measurements of suspended graphene nanofluidic devices since the voltage amplitude is just in the range of voltage operation for typical electrochemical measurements. The threshold voltage increases as SiN nanopore becomes smaller and increases with the number of graphene layers. Our work theoretically describes the blister formation and delamination of graphene from its substrate nanopores. We expect this theory to be useful for optimizing and understanding the unexpected conduction phenomena observed in suspended graphene nanofluidic devices.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 8","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Model predictive control based on LSTM neural network for maglev vehicle’ suspension system 基于LSTM神经网络的磁悬浮车辆悬架系统模型预测控制

IF 4.6 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-08-25 DOI: 10.1007/s10409-025-24572-x

Mengjuan Liu (, ), Han Wu (, ), Xin Liang (, ), Jiali Liu (, ), Xiaohui Zeng (, ), Kaixuan Hu (, )

{"title":"Model predictive control based on LSTM neural network for maglev vehicle’ suspension system","authors":"Mengjuan Liu \u0000 (, ), Han Wu \u0000 (, ), Xin Liang \u0000 (, ), Jiali Liu \u0000 (, ), Xiaohui Zeng \u0000 (, ), Kaixuan Hu \u0000 (, )","doi":"10.1007/s10409-025-24572-x","DOIUrl":"10.1007/s10409-025-24572-x","url":null,"abstract":"<div><p>To improve the suspension performance of high-speed maglev vehicles under complex external disturbance, a composite model predictive control (MPC) algorithm based on a neural network is proposed. Firstly, the nonlinear dynamic response prediction model is constructed utilizing the long short-term memory (LSTM) neural network, and this model is trained by machine learning. Subsequently, a rolling optimization controller of the MPC algorithm is designed according to the vehicle suspension system’s prediction model and the suspension target. To compensate for the error of the prediction model resulting from changes in the control algorithm, a composite MPC algorithm is devised by combining both the proportional-integral-derivative (PID) algorithm and the MPC algorithm. This composite approach enables the suspension system to switch the selection of control algorithms in the suspension system according to the prediction error. Finally, the effectiveness of the composite MPC algorithm is verified by simulation and experiment. The results show that the prediction model based on the LSTM neural network can effectively predict the future dynamic response of the vehicle. Moreover, the proposed MPC algorithm can effectively suppress the suspension gap fluctuation in the high-speed maglev vehicle, thereby fostering improved stability in the suspension system.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 5","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Static bending and wave propagation analyses of a flexoelectric semiconductor nanobeam incorporating antisymmetric thickness-stretch 含非对称厚度拉伸的柔性半导体纳米束的静态弯曲和波传播分析

IF 4.6 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-08-25 DOI: 10.1007/s10409-024-24203-x

Ziwen Guo (, ), Gongye Zhang (, ), Changwen Mi (, )

{"title":"Static bending and wave propagation analyses of a flexoelectric semiconductor nanobeam incorporating antisymmetric thickness-stretch","authors":"Ziwen Guo \u0000 (, ), Gongye Zhang \u0000 (, ), Changwen Mi \u0000 (, )","doi":"10.1007/s10409-024-24203-x","DOIUrl":"10.1007/s10409-024-24203-x","url":null,"abstract":"<div><p>We examine the electromechanical field and charge redistribution within a flexoelectric semiconductor (FS) nanobeam, accounting for bending, fundamental thickness-shear, and antisymmetric thickness-stretch deformations. The coupled governing equations include microstructure, flexoelectric, and semiconductor effects, highlighting the interplay between mechanical displacement, electric potential, and charge carriers. For applications in flexoelectronic devices, the static bending of a simply supported FS beam induced by uniform pressure and wave propagation in an unbounded FS beam are analytically addressed using the derived framework. The effects of antisymmetric thickness-stretch on mechanical displacements and electron concentration perturbation, as well as size dependence of microstructure and flexoelectric effects, are identified. An interesting finding reveals that wave frequencies of the antisymmetric thickness-stretch mode, as anticipated by the proposed model, are larger compared to those of the model neglecting flexoelectric and semiconductor effects. For the first time, the cutoff frequency of antisymmetric thickness-stretch impacted by the two features is explained mathematically. These findings are beneficial for enhancing the performance of flexoelectronic sensors and electroacoustic devices.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 12","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modelling and actuation optimization of a self-propelled robot subject to discontinuous friction 受不连续摩擦影响的自走机器人建模与驱动优化

IF 4.6 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-08-25 DOI: 10.1007/s10409-024-24567-x

Jingxuan Xue (, ), Shu Zhang (, ), Jian Xu (, )

{"title":"Modelling and actuation optimization of a self-propelled robot subject to discontinuous friction","authors":"Jingxuan Xue \u0000 (, ), Shu Zhang \u0000 (, ), Jian Xu \u0000 (, )","doi":"10.1007/s10409-024-24567-x","DOIUrl":"10.1007/s10409-024-24567-x","url":null,"abstract":"<div><p>Self-propelled robots have attracted significant attention due to their remarkable ability to navigate confined terrains. These robots usually have deformable structures while having discontinuous contact forces with the ground, resulting in a complex nonlinear system. To provide a solid foundation for the locomotion prediction and optimization for the self-propelled robots, it is necessary to conduct dynamic modelling and locomotion analysis of the robot. Motivated by these issues, this paper proposes a vibration-driven surrogate dynamic model for a deformable self-propelled robot and presents a detailed dynamic analysis. The surrogate dynamic model is employed to classify various types of stick-slip locomotion. Subsequently, the corresponding experiment demonstrates that the surrogate dynamic model effectively predicts the locomotion of the robot, particularly three types of stick-slip locomotion induced by discontinuous friction. Finally, a multi-objective coordinated optimization regarding the locomotion velocity, the cost of transport, and the energy conversion rate of the self-propelled robot is conducted, aiming to comprehensively enhance the robot’s locomotion performance. Additionally, suggestions for the selection of actuation parameters are presented.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 10","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of combined fluid-solid obstacles on flame acceleration and deflagration-to-detonation transition in a non-uniform concentration field 非均匀浓度场中流固复合障碍物对火焰加速和爆燃爆轰转捩的影响

IF 4.6 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-08-23 DOI: 10.1007/s10409-025-24780-x

Yu Wu (, ), Xinyu Zhao (, ), Yuejin Zhu (, )

{"title":"Impact of combined fluid-solid obstacles on flame acceleration and deflagration-to-detonation transition in a non-uniform concentration field","authors":"Yu Wu \u0000 (, ), Xinyu Zhao \u0000 (, ), Yuejin Zhu \u0000 (, )","doi":"10.1007/s10409-025-24780-x","DOIUrl":"10.1007/s10409-025-24780-x","url":null,"abstract":"<div><p>The paper employs the unsteady Reynolds-average Navier-Stokes method to model the flame acceleration (FA) and deflagration-to-detonation transition (DDT) processes of hydrogen/air premixed gases in the channel. By varying the distance (<i>S</i><sub>1</sub>) from the first fluid obstacle to the left wall, its impact on FA and DDT processes is investigated. The results indicate that variations in the jet position significantly influence the processes of FA and DDT. Specifically, during the initial phase of FA, FA is affected by both fluid and solid obstacles, and the FA effect is better only when the value of <i>S</i><sub>1</sub> is small. Reducing <i>S</i><sub>1</sub> can effectively shorten the DDT time, but a compromise needs to be considered when attempting to reduce both the time and distance of the DDT process. Although fluid obstacles can facilitate FA, this impact gradually diminishes over time, especially when <i>S</i><sub>1</sub> exceeds 250 mm. In this paper, the optimal results for DDT time and distance are achieved when <i>S</i><sub>1</sub> is set to 100 mm. Finally, the process of detonation initiation can be categorized into three types: (I) detonation triggered by the interaction between the leading shock wave and a solid obstacle; (II) detonation resulting from the coupling of the flame surface with a high-pressure point; (III) detonation initiated through the interaction of the flame with the reflected shock wave.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 5","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flows and mass transport in confinement 约束中的流动和质量输运

IF 4.6 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-08-22 DOI: 10.1007/s10409-025-25744-x

Yanbo Xie

引用次数: 0

Synergistic size-temperature effects on the transition of compression instability modes in shape memory alloy nanorods 尺寸-温度协同效应对形状记忆合金纳米棒压缩失稳模式转变的影响

IF 4.6 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-08-22 DOI: 10.1007/s10409-025-24618-x

Chenyang Du (, ), Aimeng Zhang (, ), Su Chen (, ), Ye Xiao (, ), Huan Li (, ), Chun Li (, ), Shaobin Zhang (, )

{"title":"Synergistic size-temperature effects on the transition of compression instability modes in shape memory alloy nanorods","authors":"Chenyang Du \u0000 (, ), Aimeng Zhang \u0000 (, ), Su Chen \u0000 (, ), Ye Xiao \u0000 (, ), Huan Li \u0000 (, ), Chun Li \u0000 (, ), Shaobin Zhang \u0000 (, )","doi":"10.1007/s10409-025-24618-x","DOIUrl":"10.1007/s10409-025-24618-x","url":null,"abstract":"<div><p>Size effect is typically expected to play an important role in the performance of low-dimensional materials. Meanwhile, due to thermo-mechanical coupling in shape memory alloys (SMAs), temperature also significantly influences phase transformation. This study investigates the synergistic size-temperature effects on the compression instability of NiTi SMA nanorods (NRs) through molecular dynamics simulations and theoretical modeling. The results indicate that the observed instability modes in NRs, namely phase transformation and buckling, are predominantly determined by their length-to-diameter ratio (<i>α</i>). The critical <i>α</i> for the transition between these two instability modes is dictated by a competitive mechanism involving phase transformation driving stress and buckling stress, both of which depend on the size and temperature of the system. A modified Timoshenko model is developed to theoretically predict the critical <i>α</i> based on this stress competition mechanism, providing a comprehensive understanding of the synergistic size-temperature effects on the modulation of the critical <i>α</i>. These findings could offer valuable insights for the mechanical design and application of micro/nano devices utilizing SMA NRs.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 4","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of transverse shear wave in pre-stressed piezoelectric fiber-reinforced composite cylindrical models with non-ideal interface: a comparative study 非理想界面预应力压电纤维增强复合材料圆柱形模型横向剪切波的对比研究

IF 4.6 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-08-22 DOI: 10.1007/s10409-024-24066-x

Arindam Nath, Sanjeev A. Sahu, Sudarshan Dhua

{"title":"Analysis of transverse shear wave in pre-stressed piezoelectric fiber-reinforced composite cylindrical models with non-ideal interface: a comparative study","authors":"Arindam Nath, Sanjeev A. Sahu, Sudarshan Dhua","doi":"10.1007/s10409-024-24066-x","DOIUrl":"10.1007/s10409-024-24066-x","url":null,"abstract":"<div><p>In the present literature, two types of piezoelectric fiber-reinforced composite (PFRC) based cylindrical models are considered to investigate the circumferential shear wave propagation on a cylinder. Model I consists of a pre-stressed PFRC layer imperfectly bonded to a pre-stressed piezoelectric cylinder of infinite length. Model II comprises a pre-stressed PFRC layer that is imperfectly bonded to a fiber-reinforced core cylinder. The dispersion equations have been derived for both models, assuming electrically open and short boundaries. The numerical simulations are carried out, and results are portrayed graphically to show the effects of various parameters. The radius ratio, pre-stress, mechanical imperfect bonding parameter, fiber reinforcement and fiber-matrix volume ratio exert considerable effects on the PFRC cylinder. Comparative analysis of the dispersion behavior reveals that the shear wave’s phase velocity varies differently for Model I and Model II, and the phase velocity for Model I is higher compared to Model II. The phase velocity reaches its minimum when the piezoelectric fiber is 0.5–0.6 by volume fraction in the PFRC layer.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 11","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved Guide-Weight method for multi-material topology optimization under inertial loads based on the alternating active-phase algorithm 基于交变有源相位算法的惯性载荷下多材料拓扑优化改进导重法

IF 4.6 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-08-22 DOI: 10.1007/s10409-024-24312-x

Zihao Meng (, ), Yiru Ren (, )

{"title":"Improved Guide-Weight method for multi-material topology optimization under inertial loads based on the alternating active-phase algorithm","authors":"Zihao Meng \u0000 (, ), Yiru Ren \u0000 (, )","doi":"10.1007/s10409-024-24312-x","DOIUrl":"10.1007/s10409-024-24312-x","url":null,"abstract":"<div><p>The application of multi-material topology optimization affords greater design flexibility compared to traditional single-material methods. However, density-based topology optimization methods encounter three unique challenges when inertial loads become dominant: non-monotonous behavior of the objective function, possible unconstrained characterization of the optimal solution, and parasitic effects. Herein, an improved Guide-Weight approach is introduced, which effectively addresses the structural topology optimization problem when subjected to inertial loads. Smooth and fast convergence of the compliance is achieved by the approach, while also maintaining the effectiveness of the volume constraints. The rational approximation of material properties model and smooth design are utilized to guarantee clear boundaries of the final structure, facilitating its seamless integration into manufacturing processes. The framework provided by the alternating active-phase algorithm is employed to decompose the multi-material topological problem under inertial loading into a set of sub-problems. The optimization of multi-material under inertial loads is accomplished through the effective resolution of these sub-problems using the improved Guide-Weight method. The effectiveness of the proposed approach is demonstrated through numerical examples involving two-phase and multi-phase materials.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 8","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0