International Journal of Mechanical Sciences最新文献

{"title":"Hyper-reduction modeling and energy transfer analysis of fluid-transporting series-parallel pipes","authors":"Wenhao Ji ,&nbsp;Zhaoyuan Yu ,&nbsp;Hongwei Ma ,&nbsp;Wei Sun ,&nbsp;Tianzhi Yang","doi":"10.1016/j.ijmecsci.2025.109974","DOIUrl":"10.1016/j.ijmecsci.2025.109974","url":null,"abstract":"<div><div>This work proposes a parameterized hyper-reduction modeling method for the fluid-transporting series-parallel pipe systems using the improved transfer matrix method of the multi-body system (MSTMM) and FEM (FEM-IMSTMM), which can predict the dynamic stress response of pipe systems efficiently and accurately. Furthermore, a camera-based vibration test is conducted to obtain the global vibration responses of the pipe systems, followed by energy transfer analysis between pipes through structural intensity analysis. Specifically, the improvements of the improved MSTMM are twofold: firstly, pre-processing of the substructure boundaries is achieved by constructing virtual nodes and rigid binding, thus avoiding the ill-conditioned transfer matrix encountered when the MSTMM is directly applied to three-dimensional solid element models; Secondly, a state transfer matrix at parallel connections is constructed, thus extending MSTMM to parallel structures. Moreover, the FEM-IMSTMM sequentially achieves the reduction of boundary, internal, modal, and intermediate interface degrees of freedom (DOFs), and the number of DOFs of the final reduced-order model is only six times the number of pipes. Finally, the influence of series and parallel connection positions on the vibration transfer behaviors is analyzed, revealing rich vibration transfer phenomena, such as energy convection, convergence, and circulation transfer.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109974"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166650","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":"Stability conditions of tensegrity structures considering local and global buckling","authors":"Shuo Ma ,&nbsp;Muhao Chen","doi":"10.1016/j.ijmecsci.2025.109951","DOIUrl":"10.1016/j.ijmecsci.2025.109951","url":null,"abstract":"<div><div>This study introduces an approach for assessing the stability of tensegrity structures by examining local and global buckling behaviors. We employ the minimal coordinate to parameterize the tensegrity configuration, incorporating nodal displacement and local bending deformation. A detailed formulation of the potential energy for tensegrity structures is presented under compression, tension, and bending. The formulation of the equilibrium equation is obtained using the principle of stationary total potential energy. Further, we study the stiffness characteristic of the structure by developing the tangent stiffness matrix. The equilibrium and stiffness of tensegrity structures with consideration of initially crooked members are derived. Our findings indicate that local and global buckling behaviors remain independent in perfect straight axial force member assumptions while they become coupled with consideration of initially crooked members. The critical buckling load of tensegrity structures under external load can be calculated by a generalized eigenvalue problem. The proposed method is also applicable to cable nets, trusses, and space frames.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109951"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167058","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":"Bioinspired acoustic meta-processor for enhancing physical and psychoacoustic functions","authors":"Yiqi Liu ,&nbsp;Linbo Wang ,&nbsp;Jinke Chang ,&nbsp;Fuyin Ma","doi":"10.1016/j.ijmecsci.2025.109915","DOIUrl":"10.1016/j.ijmecsci.2025.109915","url":null,"abstract":"<div><div>The auditory system plays a crucial role in human interaction with the environment and daily communication. The unique structural regulation function of hair cells realizes the complex mechanical hearing function of the cochlea. Inspired by outer hair cells (OHCs), this paper proposes an iterative design method based on metamaterial frequency-amplitude regulation and presents a multi-function integrated meta-processor that could replicate both the auditory system's physical and psychoacoustic functions. The core functionality focuses on the bandpass filtering, rainbow trapping, and passive mechanical modulation characteristics of the broadband acoustic signals. The robustness and signal-to-noise ratio (SNR) of the signal capture process are effectively improved by masking effect, it can also achieve A-weighted modulation for sound waves to replicate psychoacoustic equal-loudness response. It is an extra signal modulator working simultaneously with digital modulation to improve the performances of the system. The flexibility of the number and response of sub-units makes the device suitable for a wide range of application scenarios. This work demonstrates the potential of pure passive metamaterial device processing in creating functional bionic devices with sophisticated processing functions, illustrating its promise for future advancements in voice interfaces and robotic interactions.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109915"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167441","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":"Axial crushing response of novel toothed gear bio-inspired 3D printed energy absorbing structures","authors":"Chukwuemeke William Isaac ,&nbsp;Fabian Duddeck ,&nbsp;Ngoc San Ha","doi":"10.1016/j.ijmecsci.2025.110033","DOIUrl":"10.1016/j.ijmecsci.2025.110033","url":null,"abstract":"<div><div>The conventional hollow cylindrical energy absorbing structure continues to face issues due to its relatively heavier weight, resulting in a very high initial peak load during crushing, hence, lowering its overall crushing performance. To address this challenge, this paper presents a novel bio-inspired cylindrical energy absorber by introducing toothed gears to the outer part of the hollow cylindrical structure, thereby, optimising it. The novel toothed gear bio-inspired cylindrical structures (TGBCS) are additively manufactured and made from six different polymer-based materials. These TGBCS are designed to mimic the gear-like profiles and the energy absorbing capabilities in the hind legs of the issus coleoptratus insect. The TGBCS are axially compressed under quasi-static loading condition and their crashworthiness performance are investigated experimentally, numerically and analytically. Composite-like deformation mechanisms are produced by the TGBCS which lead to improved load bearing and energy absorption capacities compared to their conventional types. The results also indicate that the TGBCS made from poly-lactic acid produce the best overall crushing performance in terms of specific energy absorption (SEA), mean crushing load (MCL) and crush load efficiency (CLE). Numerical investigation further reveals that SEA and CLE of TGBCS are approximately 52.54 % and 12.80 % higher than those of the conventional hollow cylindrical structures, respectively. Also, by correct choice of shape-topological modification of the TGBCS, it is observed that SEA can be significantly improved. Moreover, by using the simplified super folding element theory, the composite-like deformation mechanism of the TGBCS is adopted to formulate the mean crushing load.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"288 ","pages":"Article 110033"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172341","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":"Modeling of discrete-continuous contact behaviors in multilevel helical structures","authors":"Yuchen Han ,&nbsp;Huadong Yong ,&nbsp;Youhe Zhou","doi":"10.1016/j.ijmecsci.2025.109977","DOIUrl":"10.1016/j.ijmecsci.2025.109977","url":null,"abstract":"<div><div>Multiple contact problems within multilevel helical structures, characterized by both line (continuous) and point (discrete) contact states, have attracted significant attention. The local unique interplay of the multilevel helical structures arises from the periodic contact between entwined helices. The quantitative characterization of internal contact behavior has always been a challenging problem. Since the transposition contact characteristic is neglected, previous theoretical models are unable to directly solve local contact behaviors of multilevel helical structures. Herein, a theoretical model is developed to address discrete-continuous contact problems within multilevel helical structures under axial tension. This research primarily focuses on the explicit derivation of concise expressions for discrete and continuous contact forces. The theoretical model is established according to the general thin rod theory combining with the elastic Hertz contact formulation. The contact transmission formulation based on the action–reaction principle is introduced to capture the contact interplay between different structural levels. The normal contact stiffness (NCS) of multilevel helical structures is further calculated. Theoretical analysis and finite element (FE) simulations reveal that the transposition contact characteristic ensures that the discrete point contact force remains nearly constant along the axis of helical structures. This consistent point contact force enables the even distribution of external loads to each helix, thereby improving the load-bearing capacity. Further investigation highlights the critical role of a trade-off between dimensionless point contact force and NCS in determining the mechanical performance in multilevel helical structures. The effective prediction range of the present model covers geometric parameters of engineering sub-cables. The theoretical model effectively extends the classical Costello model to address complex contact problems within multilevel helical structures, providing valuable theoretical guidance for designing helical structures with superior normal contact stiffness and excellent load bearing capacity.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109977"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166628","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":"Mode coupled vibration in distributed driven T-shaped MEMS resonant systems","authors":"Lei Li ,&nbsp;Huanchen Wu ,&nbsp;Peiyuan Tang ,&nbsp;Jiahao Wu ,&nbsp;Lei Shao ,&nbsp;Wenming Zhang","doi":"10.1016/j.ijmecsci.2025.109983","DOIUrl":"10.1016/j.ijmecsci.2025.109983","url":null,"abstract":"<div><div>Mode coupled vibration plays an important role in improving the dynamic performance of MEMS resonators and broadening the application range of micro-resonant devices. However, the mode coupled vibration behavior depends heavily on the natural frequency and nonlinear stiffness of MEMS resonators. In this study, a distributed electrostatic driven T-shaped resonant structure with 1:2 internal resonance potential is designed and fabricated for the first time, which can realize the modulation of mode coupled vibration by introducing multiple electrodes. Firstly, the effects of distributed driving voltage on natural frequency and dynamic behavior are measured experimentally. When the control voltage is between 210 V and 225 V, the resonator may have obvious mode coupled vibration phenomenon. Through perturbation and bifurcation analysis, the physical conditions of mode coupled vibration are deduced theoretically. It is interesting to note that both stiffness hardening and stiffness softening occur in T-shaped resonators. The mode coupled vibration phenomenon occurs twice from forward and reverse frequency sweeps. Typically, the double mechanical frequency locking induced by the transfer of vibration energy from higher mode to lower mode is measured experimentally. As the AC driving voltage increases, the resonator has obvious peak frequency stability intervals, which greatly improves the robustness of the peak frequency. Besides, the influence of vacuum degree on the mode coupled vibration behavior is also measured experimentally and predicted theoretically. With the decrease of vacuum degree, the critical driving voltage of mode coupled vibration increases obviously, which provides a new idea for the detection of vacuum degree.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109983"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166655","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":"Obliquely propagating incident SH waves in periodic hard-magnetic soft laminates","authors":"Zeeshan Alam ,&nbsp;Prabhat Kaushik ,&nbsp;Atul Kumar Sharma ,&nbsp;Bin Wu ,&nbsp;Weiqiu Chen","doi":"10.1016/j.ijmecsci.2025.109945","DOIUrl":"10.1016/j.ijmecsci.2025.109945","url":null,"abstract":"<div><div>In this paper, we present a theoretical modeling framework to investigate the influence of the nonlinear finite magneto-deformation on the propagation of shear horizontal (SH) waves at oblique angles in periodic hard-magnetic soft laminates. The equations governing the finite magneto-deformation and superimposed incremental SH waves are derived using the nonlinear field theory of hard-magnetic soft materials and its incremental magneto-elasticity theory. The constitutive response of the hard-magnetic soft laminate phases is described using an incompressible hyperelastic Gent model in conjunction with the ideal hard-magnetic soft material model. The Finite Element Method, along with Bloch–Floquet periodic boundary conditions, is utilized to solve the incremental SH wave equations. The numerical results demonstrate that the tunability of the SH wave bandgaps depends on various factors, including the applied external magnetic field, the direction of the remenant magnetization, the volume fractions of the laminate phases, and the incident angle of the SH wave. The numerical findings reported here are expected to provide a strong foundation for designing soft intelligent phononic structures with actively and remotely controlled tunable bandgaps.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109945"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167062","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":"Ultrasonic assisted grinding mechanisms of SiCf/SiC composites driven by strain-rate","authors":"Yichuan Ran,&nbsp;Jiansong Sun,&nbsp;Haiqi Sun,&nbsp;Renke Kang,&nbsp;Zhigang Dong,&nbsp;Yan Bao","doi":"10.1016/j.ijmecsci.2025.109926","DOIUrl":"10.1016/j.ijmecsci.2025.109926","url":null,"abstract":"<div><div>Ultrasonic assisted grinding (UAG) is considered an effective method for machining ceramic matrix composites (CMCs). However, the intense dynamic mechanical loads encountered during machining, along with the property disparities among fiber, matrix, and interface, increase both the uncertainty of UAG process and the difficulty in analyzing the material removal mechanism. In this study, the mechanisms underlying ultrasonic vibration were revealed via dynamic mechanical response of SiC_f/SiC composites and energy dissipation principles during machining for the first time. Through experiments with conventional grinding (CG) and UAG, it is discovered that UAG exhibits superior machining performance compared to CG, with reduced surface/subsurface damage, lower grinding forces, and decreased surface roughness. Moreover, UAG effectively minimizes discrepancies among different fiber orientations. Combining the results of dynamic mechanical response and energy dissipation model for chip fragment formation, it is found that the high strain rate induced by ultrasonic vibration promotes the embrittlement of composites. This is manifested by the increased nucleation of microcracks in both fibers and matrix, which inhibit the propagation of interfacial cracks and long cracks. Consequently, the removal modes of fibers, initially through bending or shear fracture, and matrix, initially through breakage, both transition to a pulverization mode. These transitions weaken the interfacial, heterogeneous, and anisotropic effects during machining, thereby achieving high-quality processing of SiC_f/SiC composites. This study enhances the understanding of surface formation and material removal mechanisms. Moreover, it confirms the feasibility of using dynamic mechanical response and energy dissipation principles to investigate material removal mechanisms in the machining of CMCs.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109926"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167438","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":"An improved Flory's statistical-mechanics model of chain-molecular for compressible polymers","authors":"Xinyuan Wang,&nbsp;Liqun Tang,&nbsp;Yiping Liu,&nbsp;Zejia Liu,&nbsp;Zhenyu Jiang,&nbsp;Licheng Zhou,&nbsp;Bao Yang","doi":"10.1016/j.ijmecsci.2025.109946","DOIUrl":"10.1016/j.ijmecsci.2025.109946","url":null,"abstract":"<div><div>Existing hyperelastic models require a large number of material constants to fully describe the mechanical behavior of compressible polymers, indicating that existing hyperelastic models need to be improved. To address this fundamental problem, we modified the Flory's statistical mechanics model of chain molecular by introducing a generalized multivariate Gaussian distribution of cross-linked units and derived a new Helmholtz free energy expression and macroscopic constitutive equation for polymer networks. The improved Flory's model can not only adaptively describe linear elastic and nonlinear elastic materials, but also unify the form of the constitutive equation whether the material is compressible or not. The experimental results show that the improved Flory's model containing 6 parameters can well describe the mechanical behavior of foam silicone rubber with a volume change of 150 %. Compared with existing models, the improved Flory's model not only does not require the addition of complex volume terms to characterize compressibility, but also has fewer parameters in the constitutive equation. This also shows that the improved Flory's model captures the essence of statistical mechanics of chain molecule well and has better universality.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109946"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142975207","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":"Prediction model for surface shape of YAG wafers in wafer rotational grinding","authors":"Jinxing Huang,&nbsp;Renke Kang,&nbsp;Zhigang Dong,&nbsp;Shang Gao","doi":"10.1016/j.ijmecsci.2025.109982","DOIUrl":"10.1016/j.ijmecsci.2025.109982","url":null,"abstract":"<div><div>Yttrium aluminum garnet (YAG) wafers are essential for thin disk lasers, requiring extremely low peak-to-valley (PV) values after thinning. Wafer rotational grinding is an efficient thinning method for controlling the surface shape, minimizing the time required for polishing. However, the high hardness of YAG increases grinding forces, which can deform the grinding wheel and compromise the surface shape. This paper presents a novel predictive model for the surface shape PV value of ground YAG wafers to address this issue. Initially, a grinding force model is established by considering material elasticity rebound and the size effect of material hardness. Subsequently, the wheel deformation induced by grinding force is calculated and the results are confirmed with finite element simulation. Furthermore, the effect of wheel deformation on the inclination angle is investigated, and the PV value of the ground surface is calculated. Finally, grinding tests are used to validate the suggested model, and the impact of the grinding settings on the PV value is investigated. The results demonstrate that the PV value of the wafer increases with higher grain size and wheel rotational speed, but decreases with higher workpiece rotational speed and feed rate. Additionally, wafers ground with resin-bond wheels shows lower PV value compared to those ground with vitrified-bond wheels. The experimental results align with theoretical predictions, indicating that the proposed model is accurate. This work improves the understanding for grinding surface shape prediction in wafer rotational grinding and provides valuable guidance for optimizing grinding parameters for YAG wafers.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109982"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166649","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}