International Journal of Mechanical Sciences最新文献

{"title":"A micropolar phase-field model for size-dependent electro-mechanical fracture","authors":"Akash Kumar Behera ,&nbsp;Ayyappan Unnikrishna Pillai ,&nbsp;Aniruddha Das ,&nbsp;Mohammad Masiur Rahaman","doi":"10.1016/j.ijmecsci.2024.109805","DOIUrl":"10.1016/j.ijmecsci.2024.109805","url":null,"abstract":"<div><div>This article proposes a micropolar phase-field model for size-dependent brittle fracture in solids under electro-mechanical loading conditions. Considering displacement, micro-rotation, electric potential, and phase-field variable as the kinematic descriptors and employing the virtual power principle, we derive a set of coupled governing partial differential equations (PDEs) for size-dependent solids. Invoking the first and second laws of thermodynamics, we determine the constitutive relations for the thermodynamic fluxes. Carrying out the finite element implementation of the derived governing PDEs using the open-source Gridap package in Julia, we demonstrate the efficacy of the proposed phase-field model through a few representative numerical examples. Especially the importance of the proposed model in incorporating the effect of relative rotation, i.e., the difference between macro- and micro-rotation, on the response of solids under electro-mechanical loading is shown that may not be possible with the existing non-local models such as strain-gradient or couple-stress approaches. To capture the experimentally observed size effects in solids under electro-mechanical loading, the proposed model does not demand higher-order continuity of the field variables, unlike a typically used strain gradient model. To demonstrate the efficacy of the proposed model, we have compared our results against demanding experimental and numerical benchmark results available in the literature. We provide a parametric study to unravel the effect of different micropolar material parameters on the electro-mechanical response of a brittle solid. Interestingly, the proposed micropolar model is less sensitive to the phase-field length scale than the conventional non-polar phase-field models.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109805"},"PeriodicalIF":7.1,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sea sponge-inspired designs enhance mechanical properties of tubular lattices","authors":"Ailin Chen ,&nbsp;Ukamaka Ezimora ,&nbsp;Sangryun Lee ,&nbsp;Jeong-Ho Lee ,&nbsp;Grace X. Gu","doi":"10.1016/j.ijmecsci.2024.109815","DOIUrl":"10.1016/j.ijmecsci.2024.109815","url":null,"abstract":"<div><div>The sea glass sponge, a marine organism with a distinctive tubular lattice skeleton, offers inspiration for developing resilient structures with exceptional buckling resistance. Previous work on sponge lattices focuses on mimicking the diagonal feature of the sponge unit cell; however, current understanding on the effects of the tubular three-dimensional arrangement seen in glass sponges is incomplete. This study seeks to leverage the benefits of sea glass sponge structures to enhance the performance of three-dimensional tubular lattices with improved compressive strength and elastic energy absorption. Through a combination of experimental and simulation techniques, we systematically examine the influence of varying cross-sectional shape and geometry of three-dimensional tubular lattice structures. Our experimental findings reveal that the sponge-inspired pattern surpasses all unit cell designs under compression loads. Sponge designs with a hexagonal cross-section exhibit the highest buckling strength, with a 74.9 % improvement over the non-reinforced design and a 39.0 % improvement within sponge designs. Meanwhile, the sponge designs with a circular cross-section show the best energy absorption, achieving a 90.8 % improvement over the non-reinforced design and a 54.0 % increase within sponge designs. Computational results show this novel design achieves improved stress distribution and stability due to the self-reinforcement of the struts’ orientation and reduction of stress concentration at sharp corners, which helps explain these findings. This study motivates the design of sea glass sponge structures for applications such as aerospace, marine, and infrastructure that requires high strength-to-weight ratio and buckling resistance.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109815"},"PeriodicalIF":7.1,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Residual stress reconstruction by amplification of limited measurement data via finite element analysis","authors":"S. McKendrey ,&nbsp;X. van Heule ,&nbsp;R. Ramadhan ,&nbsp;W. Kockelmann ,&nbsp;H.E. Coules ,&nbsp;C. Jacquemoud ,&nbsp;D. Knowles ,&nbsp;M. Mostafavi","doi":"10.1016/j.ijmecsci.2024.109803","DOIUrl":"10.1016/j.ijmecsci.2024.109803","url":null,"abstract":"<div><div>Welded components contain complex residual stress fields which are important to quantify when assessing their structural integrity. Often such assessments involve finite element simulation of the components; thus it is essential to include residual stress fields in the model. While previous methods have been proposed to include residual stresses in finite element models (e.g. using iterative methods or eigenstrain reconstruction of residual stresses), these can be theoretically cumbersome and computationally expensive. In this work a novel technique for reconstruction of residual stresses in welds is presented, based on iterative stress imposition and relaxation, and using limited residual stress data from energy dispersive X-ray diffraction (EDXD) measurements. This method is validated using a combination of neutron imaging of small sections of the weld and finite element analysis. A root mean squared (RMS) error of 127.26 <span><math><mrow><mi>μ</mi><mi>ɛ</mi></mrow></math></span> was achieved between the FE model and the EDXD measurement. Although the method is only viable for relatively simple geometries such as pipes and plates, this covers the most likely use cases in relevant industries such as nuclear energy. Reconstruction of residual stress fields can assist structural integrity assessments by requiring less measured residual stress data. As well as reducing measurement costs our method may enable less overly-conservative assessments, particularly for flaws that do not lie on a weld centreline. This work also demonstrates that neutron imaging residual strain measurement is a valuable tool for validating methods of weld residual stress modelling.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109803"},"PeriodicalIF":7.1,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Atomic-scale material removal and deformation mechanism in nanoscratching GaN","authors":"Jun Zhao ,&nbsp;Wuqian Li ,&nbsp;Shiwei Chen ,&nbsp;YeShen Lan ,&nbsp;Marian Wiercigroch ,&nbsp;Zixuan Wang ,&nbsp;Ji Zhao","doi":"10.1016/j.ijmecsci.2024.109804","DOIUrl":"10.1016/j.ijmecsci.2024.109804","url":null,"abstract":"<div><div>Gallium nitride (GaN) is an important third-generation semiconductor material. However, due to its high hardness, high brittleness and anisotropy, the material removal efficiency of GaN during ultraprecision machining is low, and subsurface damage easily occurs. In order to achieve high-efficiency and low-damage ultra-precision machining, the model of double nanoscratches is innovatively utilized to investigate the mechanical behavioral of GaN at the atomic scale. Specifically, double nanoscratches experiments and corresponding molecular dynamics (MD) simulations were carried out on GaN (0001) crystal plane along the <span><math><mrow><mo>[</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>0</mn></mrow><mo>]</mo></mrow></math></span> and <span><math><mrow><mo>[</mo><mrow><mn>1</mn><mover><mn>2</mn><mo>¯</mo></mover><mn>10</mn></mrow><mo>]</mo></mrow></math></span> crystal directions to reveal the material removal, deformation and subsurface damage mechanisms of GaN under anisotropic conditions. The results show that the plastic removal of GaN can be realized by setting loading force and scratch spacing. Scratching along the <span><math><mrow><mo>[</mo><mrow><mn>1</mn><mover><mn>2</mn><mo>¯</mo></mover><mn>10</mn></mrow><mo>]</mo></mrow></math></span> crystal direction has a greater ductile-brittle transition load force than the <span><math><mrow><mo>[</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>0</mn></mrow><mo>]</mo></mrow></math></span> crystal direction. MD analysis shows that the downward-extending prismatic slip produced by scratching along the <span><math><mrow><mo>[</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>0</mn></mrow><mo>]</mo></mrow></math></span> crystal direction is the cause of crack extension to the subsurface during the experiment. As the load force increases, the surface cracks of the double scratches expand and intersect, inducing streak-like brittle fracture. The significant increase in the lateral force of the second scratch is the main reason for the brittle fracture in the double scratch experiment. After the double nanoscratches experiment, the damage presented on the GaN subsurface mainly includes atomic scale damage such as amorphization, stacked laminations, polycrystalline nanoscratch, and phase transition. The Stacking fault bands around the damage zone inhibit the damage extension. The second scratch generates a large number of dislocations in the overlap zone and attenuates the subsurface amorphization under the influence of dislocation strengthening effect.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109804"},"PeriodicalIF":7.1,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation of thermal-mechanical coupling in Al alloy/steel inertia friction welding","authors":"Hao Wang,&nbsp;Guoliang Qin,&nbsp;Banglong Fu,&nbsp;Changan Li,&nbsp;Guohui Zhu","doi":"10.1016/j.ijmecsci.2024.109806","DOIUrl":"10.1016/j.ijmecsci.2024.109806","url":null,"abstract":"<div><div>Inertia friction welding (IFW) is a complicated thermal-mechanical coupling process. In-depth understanding of the thermal-mechanical process can improve the joint quality. In this study, a three-dimensional (3D) thermal-mechanical coupling model was successfully established to simulate the evolution of temperature, energy density, stress, strain, and flow behavior of the IFW process between 2219-O Al alloy and 304 stainless steel. The developed model was validated by comparing it with the measured temperature and deformation. Results show a transforming distribution of interface temperature from a M-shape to a squished V-shape during the IFW process. The characterization is attributed to the transformation of the accumulated friction energy density at the interface from a M-shape to an approximate V-shape due to the combined effect of varying sliding velocity and contact pressure. The Mises stress at the region near the interface is high and low at the steel and Al alloy sides, respectively. A significant portion of the kinetic energy stored in the flywheel is dissipated in the form of plastic deformation energy and cannot be neglected. The tracer particles show that most Al alloy at the initial interface is extruded to form flash, while a small amount of Al alloy is sticky and remains at the interface center. Increasing friction pressure and initial rotation speed result in higher interface temperature, axial shortening distance, and proportion of plastic work in total energy input.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109806"},"PeriodicalIF":7.1,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel solution for dynamic behaviors of multi-span bridge plates","authors":"Guo-Zhao Dai ,&nbsp;Yi-Chuang Wu ,&nbsp;Chien-Ching Ma","doi":"10.1016/j.ijmecsci.2024.109798","DOIUrl":"10.1016/j.ijmecsci.2024.109798","url":null,"abstract":"<div><div>The present paper draws a comprehensive analysis of the free vibration characteristics and discusses modal localization phenomena of multi-span bridge plate structures through an analytical method, numerical simulations, and experimental measurements. A novel analytical solution using the generalized superposition segment method (GSSM) is first proposed to investigate the transverse vibration of a multi-span bridge, which offers complete flexibility in describing arbitrarily classical boundary conditions. Furthermore, a new experimental setup achieves precisely simply supported boundary conditions, and scaled physical models of two- and three-span bridge plates are employed to validate the analytical solution. The effect of span length mismatch is studied by analyzing the resonant frequencies and mode shapes of a multi-span bridge plate with varying span lengths. The good consistency of results by theoretical analysis, numerical simulation, and experimental measurements indicate that the proposed analytical solution can solve the vibration problem of the multi-span bridge plate efficiently and reflect the real-world boundary condition. Finally, the two modal localization behaviors are observed in theoretical analysis and experimental measurement. Through analytical solutions, numerical simulations, and experimental measurements, this study enhances the understanding of the dynamic behavior of multi-span bridges. It provides a new theoretical benchmark for predicting vibrations of multi-span bridge systems and useful insights into the transient behavior of multi-span bridge plates, suggesting several fruitful avenues for future research, including exploring passive and active control systems and vibration suppression techniques.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109798"},"PeriodicalIF":7.1,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The mechanics and morphology evolutions in stretched ribbons under torsion: A 3D phase diagram","authors":"Hao Liu ,&nbsp;Lei Liu ,&nbsp;Dabiao Liu","doi":"10.1016/j.ijmecsci.2024.109786","DOIUrl":"10.1016/j.ijmecsci.2024.109786","url":null,"abstract":"<div><div>Slender structures ubiquitously undergo complex shape transformations in both natural and artificial systems. Soft ribbons can exhibit rich morphologies when subjected to loading and geometric constraints. The competition between the macroscopic, microscopic, and transverse buckling modes results in multiple morphological transitions, revealing distinct evolution paths among helicoid, crease, cylinder, and scrolled yarn configurations. However, the roles of tension, twist, and geometry in determining the buckling modes of a stretched ribbon under torsion remain unclear. In this study, we comprehensively investigate the torsional instabilities of elastic ribbons through experiments, theory, and finite element simulations. A one-dimensional model is employed to describe the nonlinear torsional responses in the helicoid stage. We present a modeling approach to describe the crease configuration and derive a semi-analytical solution based on the finite element analysis. We find that the competition between the macroscopic and microscopic buckling modes is governed by the thickness-to-width ratio, which determines the relative magnitudes of the membrane and bending strain energy in the helicoid. Additionally, as the applied tension increases, the buckling mode shifts from the longitudinal to the transverse direction. A three-dimensional phase diagram, as a function of twist, tension, and thickness-to-width ratio, is constructed to identify the morphology transitions of elastic ribbons. This study has implications for understanding the morphological complexity and achieving precise control of slender structures.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109786"},"PeriodicalIF":7.1,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of surface integrity on quality factor of hemispherical resonator","authors":"Chuanzhen Ma ,&nbsp;Henan Liu ,&nbsp;Mingjun Chen ,&nbsp;Jian Cheng ,&nbsp;Jinchuan Tian ,&nbsp;Biao Qin ,&nbsp;Jiangang Sun ,&nbsp;Zihan Zhou ,&nbsp;Jingyang Guo","doi":"10.1016/j.ijmecsci.2024.109797","DOIUrl":"10.1016/j.ijmecsci.2024.109797","url":null,"abstract":"<div><div>Since hemispherical resonator (HSR) is core component of hemispherical resonator gyro (HRG), the surface integrity directly determines performance parameters of HSR, which then affects the working accuracy and service life of HRG. Therefore, it is necessary to investigate the effect of surface integrity on quality factor of HSR. This work focuses on the surface integrity evolution of fused silica HSR machined by the multi-energy field coupled magnetorheological polishing (MEMRP) and the influence of surface integrity on quality factor. Firstly, the mechanism of removing subsurface damage and surface morphology evolution of the fused silica component machined by MEMRP were investigated to reveal the surface quality evolution rules. It was found that the removal of subsurface damage in fused silica components can be divided into three zones: rapid improvement zone, slow improvement zone, and gentle improvement zone. The improvement of surface roughness is slow in the gentle improvement zone, and the nonlinear regression model between subsurface damage depth and surface roughness is proposed. Then, the surface structure evolution and the mechanical characteristics of the surface layer of fused silica components during the MEMRP process was systematically analyzed. It was found that the initial polishing stage significantly improved the surface mechanical performance parameters. Finally, the quality factor of HSR with various surface qualities was measured. The results show that the subsurface damage depth and quality factor exhibit nonlinear relationship and the crack surface layer has a significant impact on the quality factor. Completely removing the subsurface damage, quality factor of HSR with diameter of 20 mm increased from hundreds of thousands to 2.01×10⁷, and the uniformity of quality factor is 1.2 %. This work could offer theoretical guidance and parameter basis for quickly removing subsurface damage and achieving high-performance manufacturing of fused silica HSR.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109797"},"PeriodicalIF":7.1,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on the impact resistance of fill-enhanced mechanical metamaterials","authors":"Wei-Jing Wang ,&nbsp;Hang Yang ,&nbsp;Wei-Ming Zhang ,&nbsp;Nan Shang ,&nbsp;Li Ma","doi":"10.1016/j.ijmecsci.2024.109799","DOIUrl":"10.1016/j.ijmecsci.2024.109799","url":null,"abstract":"<div><div>Mechanical metamaterials are attracting increasing interest as artificial architected/composite materials with unprecedented physical properties and promising engineering applications. To address the gaps in current research, particularly the lack of comprehensive insights into reusable, adaptive behaviors and the potential for enhanced energy absorption in the zero Poisson's ratio (ZPR) domain, a family of 3D ZPR mechanical metamaterials composed of thin-plate and axisymmetric thin-shell segments is introduced. Mechanical performance, self-recovery under large deformations, reusable, and strain rate-dependent adaptive energy absorption are achieved. Furthermore, the mechanical performance and functionality of the semi-closed structure composed of both plates and curved shell (SPCS) are further enhanced by filling shear thickening gel (STG). Quasi-static compression and drop-weight impact tests are carried out to investigate the mechanical properties of the SPCS and the influence of impact velocities on its energy absorption performance, quantifying the enhancement effect of filling STG and demonstrating the resistance of SPCS to secondary and even multiple impacts. The extrusions resulting from spatial constraints between the axisymmetric shell containers and the STG fillers enhance strength and plateau stress, improve impact resistance, and enable adaptive energy absorption. The variation in stiffness and energy absorption of filled-SPCS with strain rate adeptly resolves the conflict between comfort and functionality in designs such as wearable protective devices, blast protection, and reactive armor, thereby paving the way for the development of strain rate-dependent mechanical metamaterials. Collectively, a series of ZPR mechanical metamaterials, which offer better energy absorption, broader applicability, enhanced adaptability, and reusability compared to traditional lattices, are introduced. This contributes to insights and guidance to the development of cushioning energy-absorbing metamaterial designs.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109799"},"PeriodicalIF":7.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trapping micro-swimmers over a cavity in an inertial micro-channel","authors":"Xiao Hu ,&nbsp;Weijin Chen ,&nbsp;Wanqiong Tao ,&nbsp;Jianzhong Lin ,&nbsp;Zuchao Zhu ,&nbsp;Linmin Li ,&nbsp;Bo Liu","doi":"10.1016/j.ijmecsci.2024.109796","DOIUrl":"10.1016/j.ijmecsci.2024.109796","url":null,"abstract":"<div><div>Based on the lattice Boltzmann method and the squirmer self-propulsion model, this paper focuses on the motion characteristics of three types of swimmers (neutral swimmer, puller, pusher) over a cavity in an inertial micro-channel. The effects of fluid inertia (<em>Re_f</em>) and channel-cavity structural parameters (<em>L_d, L_w</em>) on the capture and separation of micro-swimmers are analysed. The results indicate that there are five motion modes of swimmer under low Reynolds number. As fluid inertia increases, three new motion modes emerge. Neutral swimmer is captured at low <em>Re_f</em>, while the puller and pusher are captured at high <em>Re_f</em>. Under a suitable cavity aspect ratio, the puller also exhibits an additional new trapping mode known as the circle loop trapping. Moreover, the pusher with large activity will behave differently at various Reynolds numbers. Ultimately, through data and theoretical analysis, theoretical formulas are developed to reflect the effect of cavity size and Reynolds number on the capture and separation performance through the phase diagram. By integrating the examination of diverse trapping behaviours of microwimmers within complex microchannel structures, this study significantly enhances our understanding of the complex motion of microwimmers in intricate flow environments, and facilitates the manipulation and control of manmade microwimmers.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"285 ","pages":"Article 109796"},"PeriodicalIF":7.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}