International Journal of Mechanical Sciences最新文献

{"title":"Constitutive modeling of shear thickening fluid using continuum mechanics","authors":"Jinyu Yang ,&nbsp;Junshuo Zhang ,&nbsp;Bochao Wang ,&nbsp;Xinglong Gong","doi":"10.1016/j.ijmecsci.2025.110057","DOIUrl":"10.1016/j.ijmecsci.2025.110057","url":null,"abstract":"<div><div>Shear thickening fluid (STF) exhibits intelligent rheological properties associated with its strain rates, demonstrating excellent viscosity thickening and thinning effects. These properties effectively enhance the performance of STF utilized in impact protection. However, the thickening effect has posed significant difficulties in the theoretical study of STF, resulting in a lack of specific constitutive models and experimental verification. To address this issue, we perform systematic rheological tests across a wide range of loading rates, thoroughly exploring the intelligent rheological responses of STF. Based on the mechanical behavior, we utilize an innovative approach for STF to develop a novel shear-thickening constitutive model within a framework of continuum mechanics, contributing to its theoretical understanding and providing guidance for applications. Given the nonlinearity of the constitutive equations, we present a corresponding numerical implementation approach to efficiently obtain solutions, and subsequently conduct parameter identification using this approach. The significant overlap between the experimental results and model predictions indicates that the new model accurately captures the intelligent rheological behaviors of STF. Furthermore, we design a series of simulations as anti-impact application scenarios of the STF-based composite, which activates a viscosity thickening effect to deliver strong resistance during high-speed impacts. Interestingly, unlike constant-viscosity materials, the STF-based composite exhibits a unique thinning effect and consumes very little energy during low-speed impacts. Consequently, when used as wearable equipment, it not only effectively weakens high-speed impacts, but also facilitates unrestricted movement during low-speed activities. These findings offer valuable guidance for the designs and applications of STF-based products.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"289 ","pages":"Article 110057"},"PeriodicalIF":7.1,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464003","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":"Phase-field simulation on grain-size dependent fracture of cyclically loaded NiTi-SMA","authors":"Junyuan Xiong ,&nbsp;Bo Xu ,&nbsp;Jiachen Hu ,&nbsp;Guozheng Kang","doi":"10.1016/j.ijmecsci.2025.110041","DOIUrl":"10.1016/j.ijmecsci.2025.110041","url":null,"abstract":"<div><div>Based on crystal plasticity theory, a new non-isothermal fracture phase field model was proposed, incorporating various inelastic deformation mechanisms in NiTi shape memory alloy (SMA). The crack propagation of NiTi-SMA under cyclic loading was simulated by addressing its one-way shape memory effect (OWSME) and super-elasticity (SE). The effects of stress-induced martensite transformation (MT), temperature-induced MT, martensite reorientation (MR), and plastic deformation on the crack propagation of NiTi-SMA were examined. The simulated results indicate that dissipation caused by MT, MR, and plastic deformation effectively reduces the crack propagation rate. The fracture mode (crack propagation path) of NiTi-SMA is strongly correlated with the distribution of grain boundaries. As the grain size increases, the crack propagation rate in the super-elastic NiTi systems increases, and the fracture mode gradually transitions from the transgranular fracture to the intergranular one. However, the crack propagation path in the OWSME NiTi system exhibits independence on grain size, and the crack propagation rate within the OWSME system is slightly lower than that in the SE system. The difference of fracture behavior between the super-elastic NiTi system and shape memory NiTi system can be explained from the perspective of microstructure evolution.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"289 ","pages":"Article 110041"},"PeriodicalIF":7.1,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444668","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":"Investigation on the hysteresis behavior of a quarter-wavelength standing-wave thermoacoustic engine","authors":"Kai Wang ,&nbsp;Shancheng Tao ,&nbsp;Zhaoyu Li ,&nbsp;Xinyan Li ,&nbsp;Lihua Tang ,&nbsp;Geng Chen","doi":"10.1016/j.ijmecsci.2025.110084","DOIUrl":"10.1016/j.ijmecsci.2025.110084","url":null,"abstract":"<div><div>Like many nonlinear dynamical systems, thermoacoustic engines (TAEs) exhibit hysteresis behavior in the amplitude of self-excited acoustic oscillations when the temperature gradient implemented across the porous material is first increased and then decreased gradually. This research studies the hysteresis of a quarter-wavelength standing-wave TAE that relies on a parallel plate stack to realize thermal-acoustic energy conversion. Computational fluid dynamics (CFD) is first employed to investigate the influence of stack parameters, such as stack gap and position, on the hysteresis behavior of the TAE. Following this, in analogy with the modeling of Rijke tubes, a simplified mathematical model of the TAE is developed to provide a qualitative interpretation of the hysteresis curves obtained from the CFD simulations. Finally, experimental tests are conducted to validate the presence of hysteresis in the TAE. Results show that in the bistable zone, the dynamic behavior of the TAE can be either linearly stable fixed points or limit cycles. An external pressure disturbance or energy sink can be applied to alter the dynamics of the TAE. There exist optimal values for the stack gap and position at which the lower and upper critical temperatures, as well as their difference, are minimized. At the optimal stack gap, the pressure amplitude reaches its minimum. However, as the stack is shifted toward the open end, the pressure amplitude gradually decreases, highlighting a trade-off between reducing the onset temperature difference and improving acoustic power generation. The present study gives deeper insights into the hysteresis phenomena reported in previous experimental studies, providing useful guidelines for reducing the critical temperature gradients for the excitation of acoustic oscillations in TAEs.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"290 ","pages":"Article 110084"},"PeriodicalIF":7.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552474","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":"Scaling effect of impact response for CFST components","authors":"Liu Jin,&nbsp;Qian Fu,&nbsp;Renbo Zhang,&nbsp;Jian Li,&nbsp;Xiuli Du","doi":"10.1016/j.ijmecsci.2025.110051","DOIUrl":"10.1016/j.ijmecsci.2025.110051","url":null,"abstract":"<div><div>The plastic deformation and the strain rate effect caused by the dynamic impact load may cause the classical similarity law to no longer apply to the mutual derivation of the impact resistance between the geometrically similar concrete-filled steel tube (CFST) components. In this study, four CFST components with similar geometric sizes were designed. The effect of component size on the impact response indexes, such as impact displacement, impact force, and energy absorption of geometrically similar CFST components, was studied. It is concluded that the above impact response indexes of geometrically similar CFST components do not fully conform to the classical similarity law; that is, they have a scaling effect. The scaling effect of impact displacement is mainly due to the severe plastic deflection deformation in the mid-span impacted area of large-size CFST components. The scaling effect of impact force is primarily due to the slight normalized contact stiffness in the mid-span impacted area and the severe global stiffness degradation of the large-size CFST components. The scaling effects of the relevant impact response indexes studied in this paper are related to severe plastic deformation and minor contact stiffness of large-size components, and their scaling effect is more significant with the increasing scale factor, which is consistent with those for steel tube and reinforced concrete components. In addition, based on the simulation results and drawing on the classical similarity law expression, the scaling effect model of displacement and impact force for geometrically similar CFST components is preliminarily established, which can predict the calculated scale factor of impact response for CFST components.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"289 ","pages":"Article 110051"},"PeriodicalIF":7.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480562","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":"Vibro-acoustic Helmholtz absorber with soft wall for broadband sound absorption","authors":"Xiaoli Liu ,&nbsp;Jiu Hui Wu ,&nbsp;Jiamin Niu ,&nbsp;Wei Li ,&nbsp;Chongrui Liu","doi":"10.1016/j.ijmecsci.2025.110083","DOIUrl":"10.1016/j.ijmecsci.2025.110083","url":null,"abstract":"<div><div>Aiming at the issue of low-frequency broadband sound absorption, integrating soft materials into acoustic metamaterials offers a promising method to enhance absorption performance. In this paper, a soft-wall vibro-acoustic Helmholtz metamaterial (SVHM) is presented to achieve low-frequency broadband sound absorption, consisting of two parallel Helmholtz resonators (HRs) and a shared vibro-acoustic plate as the soft boundary. Introducing the soft plate not only couples its multiple vibration modes with the neck hole generating additional resonance peaks, but also enhances the energy dissipation of the original HR structure, thereby improving the sound absorption performance of the SVHM structure compared to HRs of the same thickness. A sample with an average absorption coefficient of 0.83 in the range of 306 Hz - 1188 Hz was designed, and the absorption bandwidth was broadened compared with the corresponding rigid sample of the same size. This SVHM structure could have potential applications in architectural acoustics, mechanical equipment, and transportation noise reduction.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"289 ","pages":"Article 110083"},"PeriodicalIF":7.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487872","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":"Blast behaviors of biomechanically inspired helicoidal honeycomb plates","authors":"Ning Hao ,&nbsp;Wangchen Yan ,&nbsp;Man Zhou ,&nbsp;Peng Wang","doi":"10.1016/j.ijmecsci.2025.110082","DOIUrl":"10.1016/j.ijmecsci.2025.110082","url":null,"abstract":"<div><div>Crustaceans in nature exhibit a Bouligand-type helicoidal fiber structure, giving them exceptional damage and impact resistance. Honeycomb plates, known for their lightweight and high strength, are extensively used in aerospace, transportation, and architecture. This study presents a novel biomimetic helicoidal honeycomb plate (HHP) that combines the benefits of both these structures. By varying cell geometries (15, 12.5, 10, and 7.5 mm) and helicoidal angles (0°, 60°, 120°, and 180°), the mechanical response of the HHP to blast loadings is examined. Results indicate that the helicoidal angle significantly improves blast resistance. Specifically, the 180° helicoidal angle with 15 and 12.5 mm cell geometries provides the highest blast resistance, while the 120° angle performs best for 10 mm cells and the 0° angle for 7.5 mm cells. To achieve optimal blast resistance, balancing rigidity and toughness is essential. Increasing the helicoidal angle improves blast resistance, especially in structures with lower rigidity. These insights are crucial for the design of advanced protective structures, offering valuable guidance for blast and impact protection in the fields of protective and safety engineering.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"289 ","pages":"Article 110082"},"PeriodicalIF":7.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464004","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":"Enhancing piezoelectric energy harvesters with rotating triangular auxetic structures","authors":"Xiaofan Zhang,&nbsp;Xiaobiao Shan,&nbsp;Guangdong Sui,&nbsp;Chengwei Hou,&nbsp;Xuteng Du,&nbsp;Zhaowei Min,&nbsp;Tao Xie","doi":"10.1016/j.ijmecsci.2025.110081","DOIUrl":"10.1016/j.ijmecsci.2025.110081","url":null,"abstract":"<div><div>The development of piezoelectric energy harvesters is currently constrained by factors such as output power, bandwidth, and natural frequency, which limit their capacity to efficiently capture the low-frequency vibrational energy prevalent in the environment. To address these challenges, this paper proposes a novel approach to enhance the performance of piezoelectric energy harvesters by integrating a rotating triangular auxetic structure. A method for analyzing the mechanical performance of the auxetic structure under lateral constraints is introduced, demonstrating that the structure exhibits favorable negative Poisson's ratio characteristics and design flexibility. Furthermore, the auxetic structure is incorporated into a cantilever beam piezoelectric energy harvester to design and fabricate a novel auxetic-enhanced energy harvester (AEH), alongside a plate substrate energy harvester (PEH) for comparison. Finite element method (FEM) simulations and experimental results show that the auxetic structure increases the average stress in the piezoelectric patch, creating a distinct negative Poisson's ratio region. Under varying geometric parameters and unit cell numbers, the proposed AEH outperforms the conventional PEH, with output power improvements ranging from 96.3 % to 266.1 %, and reductions in natural frequency between 15.35 % and 42.65 %. By appropriately selecting geometric parameters, the AEH also broadens the energy harvesting bandwidth. This enhancement makes the AEH particularly well-suited for capturing low-frequency vibrational energy from the environment. The large negative Poisson's ratio of the auxetic structure, as demonstrated in this study, contributes to an increased energy density in the piezoelectric patch.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"289 ","pages":"Article 110081"},"PeriodicalIF":7.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471387","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-driven machine learning for real-time damage prognosis in masonry structures","authors":"A.M. D’Altri ,&nbsp;M. Pereira ,&nbsp;S. de Miranda ,&nbsp;B. Glisic","doi":"10.1016/j.ijmecsci.2025.110055","DOIUrl":"10.1016/j.ijmecsci.2025.110055","url":null,"abstract":"<div><div>Static structural health monitoring of masonry and heritage structures typically consists of tracking crack width evolution over time. However, the health evaluation of the current structural condition is not easily relatable to the actual cracks widths. In this paper, crack patterns in masonry walls are related to a stress increase indicator based on data generated through simulations employing accurate block-based numerical models of masonry walls damaged by differential settlements- and earthquake-like scenarios. Such stress increase indicator is defined through a percentile of the static cumulative minimum principal stresses distribution in a damaged wall, so it can be straightforwardly related to the occurrence of crushing failure. Driven by this simulation-generated dataset, a machine learning predictor is trained, validated and tested to provide stress increase indicators in damaged masonry walls by using as only input the crack width distributions of the walls. This allows to originally provide a crack pattern-based real-time damage prognosis tool in static monitoring of cracked masonry walls and structures.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"289 ","pages":"Article 110055"},"PeriodicalIF":7.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453874","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":"An acoustic spatiotemporal vortex pulse generated by a reflective meta-grating","authors":"Yiyang Gui ,&nbsp;Mian Yang ,&nbsp;Xingfeng Zhu ,&nbsp;Jie Yao ,&nbsp;Qi Wei ,&nbsp;Dajian Wu","doi":"10.1016/j.ijmecsci.2025.110080","DOIUrl":"10.1016/j.ijmecsci.2025.110080","url":null,"abstract":"<div><div>Acoustic spatiotemporal vortex pulses (ASTVPs) with transverse orbital angular momentum (OAM) in the spatiotemporal domain have garnered increasing attention in recent years because they may present new avenues for OAM state applications. Here, we propose a simple reflective meta-grating (RMG) to efficiently produce an ASTVP in air. By harnessing the periodicity and mirror symmetry of the meta-grating, a phase singularity can be found at the resonance point in momentum-frequency domain. It is further demonstrated that the spiral phase in the momentum-frequency domain can be transferred to the spatiotemporal domain through Fourier transform, resulting in an ASTVP. In addition, the good robustness of the ASTVP against angular misalignment and structural defects in the meta-grating is presented‌ by finite-element method. Finally, the RMG is fabricated using 3D printing, and experimental results confirm the successful generation of the ASTVP by the RMG. Our work provides a simple strategy to achieve ASTVP and offers the possibility of using it for acoustic manipulation and acoustic communication.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"289 ","pages":"Article 110080"},"PeriodicalIF":7.1,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453873","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":"Comparative analysis of energy harvesting by magnetoelectric components in a simulated biological environment","authors":"Zhuang Ren ,&nbsp;Changyi Liu ,&nbsp;Minghe Li ,&nbsp;Wenwei Ge ,&nbsp;Liming Zhou ,&nbsp;Hongwei Zhao ,&nbsp;Lihua Tang ,&nbsp;Luquan Ren","doi":"10.1016/j.ijmecsci.2025.110042","DOIUrl":"10.1016/j.ijmecsci.2025.110042","url":null,"abstract":"<div><div>Implantable micro-electro-mechanical devices represent the most promising wearable technology for accurate and rapid monitoring of physiological parameters, as well as for delivering electrical stimulation to enhance therapeutic outcomes. However, reliance on battery power poses significant challenges, including medical risks associated with multiple surgeries for battery replacement and potential health threats from chemical leakage, which can also lead to environmental pollution. To address the demand for wireless energy supply in low-power applications, this paper proposes a wireless energy transmission technology based on the magneto-electromechanical effect (MME). By utilizing magnetostrictive and piezoelectric materials, the magnetoelectric energy harvesting component efficiently converts external magnetic field energy into electrical energy. Subsequent power management circuits enable the effective powering of MEMS devices. An experimental test system for the magnetoelectric energy harvesting component was developed. Comparative studies revealed that applying a magnetic field along the length of the components, using high-performance PMN-PT piezoelectric materials, and employing rigid packaging methods achieve the most efficient magnetic field-vibration dual-mode energy harvesting. A self-fixed high-performance magnetoelectric energy harvesting structure was then proposed, and its magnetoelectric energy conversion efficiency and power density were evaluated under simulated implantation conditions through simulation and experimentation. The results demonstrated that, under an excitation of 5 Oe AC magnetic field, a maximum power density of 345.1 μW/cm³ could be achieved with an external resistance of 200 kΩ. By leveraging the electric energy generated by the device in conjunction with a fundamental power management circuit, this research scheme successfully illuminates an Led lamps and provides power to a low-power thermometer. A key highlight of this study is the comparative analysis of various factors influencing the performance of magnetoelectric energy harvesting components. Additionally, a reliable packaging scheme and structure for use as an implantable device has been proposed, which establishes a solid foundation for future optimization of device performance.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"288 ","pages":"Article 110042"},"PeriodicalIF":7.1,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403434","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}