International Journal of Mechanical Sciences最新文献_第9页

Blood–brain mechanics: How brain tissue responds to pulsatile blood flow dynamics 血脑力学：脑组织对脉动血流动力学的反应

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-04-25 DOI: 10.1016/j.ijmecsci.2025.110278

Xiaoyuan Gao , Tian Yuan , Zisheng Liao , Yi Yang , Weiguo Wu , Wenbo Zhan , Daniele Dini

{"title":"Blood–brain mechanics: How brain tissue responds to pulsatile blood flow dynamics","authors":"Xiaoyuan Gao , Tian Yuan , Zisheng Liao , Yi Yang , Weiguo Wu , Wenbo Zhan , Daniele Dini","doi":"10.1016/j.ijmecsci.2025.110278","DOIUrl":"10.1016/j.ijmecsci.2025.110278","url":null,"abstract":"<div><div>Highly coupled interactions between nonlinear fluids and soft matter are ubiquitous in nature and critical for various applications. A prime example is the blood–brain interaction, where the pulsatile non-Newtonian blood flow deforms the extremely soft and highly nonlinear human brain tissues. Understanding this dynamic is vital, as it can provide critical insights into neurological issues and their underlying mechanisms. However, experimentally investigating these interactions is less feasible due to the limited access to the human brain. Although advanced computational models have been developed to simulate blood flow in the human brain, a comprehensive model that can reconcile the various nonlinear components in a fully coupled framework to capture the specific interactions between the blood flow, vessel movement, and brain tissue dynamics remains elusive.</div><div>To explore the mechanisms governing blood–brain interactions, we have developed an innovative finite element model that seamlessly integrates the interactions between non-Newtonian blood flow, hyperelastic blood vessels, and hyper-viscoelastic brain tissue. This model is enhanced by a hyper-viscoelastic model based on compression–relaxation tests of human brain tissues, which can precisely capture their time-dependent nonlinear behaviour. Comprehensive simulations based on this model illustrate how pulsatile blood flow significantly deforms brain tissues under various scenarios. This study not only offers new possibilities for understanding the intimate links between brain function and its biomechanics, but also provides a novel modelling framework to solve complex interactions between nonlinear fluids and soft matter across several other scientific disciplines and fields.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110278"},"PeriodicalIF":7.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904268","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}

引用次数: 0

Synergetic integration of elastic constraint and linkages for enhancing vibration isolation 提高隔振性能的弹性约束与连杆的协同集成

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-04-25 DOI: 10.1016/j.ijmecsci.2025.110308

Wei Dai , Weiye Xu , Lin Wang , Jian Yang , Tianyun Li , Xiang Zhu , Xueliang Meng , Liaoyuan Ran

{"title":"Synergetic integration of elastic constraint and linkages for enhancing vibration isolation","authors":"Wei Dai , Weiye Xu , Lin Wang , Jian Yang , Tianyun Li , Xiang Zhu , Xueliang Meng , Liaoyuan Ran","doi":"10.1016/j.ijmecsci.2025.110308","DOIUrl":"10.1016/j.ijmecsci.2025.110308","url":null,"abstract":"<div><div>This study proposes synergic use of elastic constraints and linkage mechanism in creating nonlinear vibration isolators to enhance their low-frequency isolation performance. The use of constraint overcomes the folding problem of linkages under large deflections and their hybrid use offers great performance benefits. The vibration-attenuation enhancement owing to the integration of nonlinear elements into a single-stage isolation system and an isolation system with a flexible foundation is investigated considering applications in marine or aerospace engineering. The harmonic-balance method (HBM) with an alternating frequency/time scheme and time-marching method are employed to calculate the responses. The performance of the proposed nonlinear isolator is experimentally validated. The vibration transmissibilities and power-transmission indices are used as measures of the isolation performance. The results show that the nonlinear isolator considerably decreases the power flow and vibration transmissibility to the base over a broad frequency range. The use of the elastic constraint enables a wider range of spring-linkage parameters in the design, and the proposed isolator can provide improved vibration-attenuation capabilities at low frequencies. With the integration of constraint and linkages, the peaks in the curves for the force transmission and power flow to the flexible foundation are significantly suppressed and shifted towards lower frequencies. A base-motion excitation experiment is conducted, and the results validate the effectiveness of the proposed nonlinear isolator, showing a lower resonant frequency and reduction in the peak displacement transmissibility. This study demonstrates that the proposed isolator design can be further applied to the isolation platform of onboard mechanical systems.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110308"},"PeriodicalIF":7.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143913244","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}

引用次数: 0

Constrained vibration of butterfly-shaped honeycomb sandwich panels under base motion 基础运动下蝴蝶形蜂窝夹层板的约束振动

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-04-24 DOI: 10.1016/j.ijmecsci.2025.110267

Liu Rong , Zhong Yifeng , Poh Leong Hien , Tang Yuxin , Li Wei

{"title":"Constrained vibration of butterfly-shaped honeycomb sandwich panels under base motion","authors":"Liu Rong , Zhong Yifeng , Poh Leong Hien , Tang Yuxin , Li Wei","doi":"10.1016/j.ijmecsci.2025.110267","DOIUrl":"10.1016/j.ijmecsci.2025.110267","url":null,"abstract":"<div><div>Periodic base motion at the edges of panels can induce significant vibrations, impacting stability, safety, and stealth performance. This study examines the vibration characteristics of butterfly-shaped auxetic honeycomb sandwich panels (BF-HSP) under base motion. Through experiments and 3D FE modeling (3D-FEM), the accuracy of the 2D equivalent plate model (2D-EPM), based on the variational asymptotic method, is validated in free modal analysis. Further analysis using 3D-FEM and 2D-EPM evaluates the constrained modes and local responses of BF-HSP under periodic base motions. Compared to 3D-FEM simulations, the equivalent model enhances computational efficiency, requiring only 1.04% of the computation time, while maintaining high accuracy in predicting constrained vibration characteristics, with a maximum error under 10%. Compared to arc-shaped and re-entrant honeycomb sandwich panels (AR-HSP and RE-HSP), the proposed BF-HSP excel in suppressing low-frequency resonance and reducing resonance amplitude by up to 6.1%. Local field analysis reveals that the butterfly-shaped core of BF-HSP effectively mitigates dynamic stress concentration, especially along the inclined core struts, resulting in a 4.1% reduction in local dynamic stress compared to AR-HSPs and a 32.4% reduction compared to RE-HSPs. This study offers a highly efficient and reliable solution for the design of auxetic honeycomb sandwich panels, enhancing vibration damping performance and structural stability while mitigating the adverse effects of vibration resonance.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110267"},"PeriodicalIF":7.1,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874278","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}

引用次数: 0

Synergistic effects of He, Fe, and deuterium ions on tungsten He、Fe和氘离子对钨的协同效应

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-04-24 DOI: 10.1016/j.ijmecsci.2025.110306

Jianlong Chai , Dahuan Zhu , Zongxiao Guo , Baoguo Wang , Li Qiao , Rong Yan , Rui Ding , Yang Wang , Peng Wang , Tielong Shen , Zhiguang Wang , Junling Chen

{"title":"Synergistic effects of He, Fe, and deuterium ions on tungsten","authors":"Jianlong Chai , Dahuan Zhu , Zongxiao Guo , Baoguo Wang , Li Qiao , Rong Yan , Rui Ding , Yang Wang , Peng Wang , Tielong Shen , Zhiguang Wang , Junling Chen","doi":"10.1016/j.ijmecsci.2025.110306","DOIUrl":"10.1016/j.ijmecsci.2025.110306","url":null,"abstract":"<div><div>Plasma-facing materials (PFMs) in fusion reactors are subjected to irradiation by high-energy neutrons and high flux plasmas during operation. Especially, in the presence of helium (He), <span><span>irradiation</span><svg><path></path></svg></span> can significantly exacerbate the degradation of material properties. Hence, experimentally investigating the irradiation tolerance of PFMs under the combined effects of He, neutron, and plasma irradiation is essential for ensuring the safe operation of fusion devices. Here, heavy-ion simulations of neutrons were utilized to investigate the synergistic effects of He/Fe/D ions on the microstructural and micromechanical properties of tungsten PFMs. The results show that He + Fe dual-ion irradiation leads to significant irradiation hardening, which is attributed to the increase of both the density and size of dislocation loops. The annealing effect of pre-damaged W under D plasma exposure is considered to be the primary factor driving the evolution of dislocation loops. The significant reduction in the number density of dislocation loops is considered to be the main factor contributing to the reduction in hardening increment after <span>d</span>-ion implantation. To our knowledge, this is among the first studies to simulate the evolution of defects and nanohardness in W PFMs in fusion reactors under the combined influence of He, displacement damage and plasma. This research offers insights into the irradiation damage effects of PFMs in fusion reactors and serves as a reference for the development of new W-based alloy materials.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"297 ","pages":"Article 110306"},"PeriodicalIF":7.1,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923113","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}

引用次数: 0

Coupled nano-interfacial and agglomeration effects on elastic behavior of hybrid composites using multi-scale modeling 基于多尺度模拟的纳米界面和团聚耦合效应对混杂复合材料弹性行为的影响

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-04-24 DOI: 10.1016/j.ijmecsci.2025.110273

Leeladhar Rajput, Prasun Jana

{"title":"Coupled nano-interfacial and agglomeration effects on elastic behavior of hybrid composites using multi-scale modeling","authors":"Leeladhar Rajput, Prasun Jana","doi":"10.1016/j.ijmecsci.2025.110273","DOIUrl":"10.1016/j.ijmecsci.2025.110273","url":null,"abstract":"<div><div>In this work, a novel multi-scale micromechanical model is developed to effectively predict the overall elastic properties of nano-coated carbon fiber reinforced hybrid composites (NCRHC). The present model investigates the impact of CNT-matrix interfacial shells and CNT agglomeration on the characteristics of NCRHC using a novel mean-field theory (MFT) coupled with a 3D mechanics of material (MOM) micromechanics approach. The mean-field theory is employed to analyze the nonlinear behavior of the elastic properties in the agglomerated nano-coated region (NCR). Most of the existing mathematical models neglect the nonlinear behavior of elastic properties due to the interfacial shell and fail to capture the weakening effects of high nanofiber (CNT) concentrations, which contradicts experimental observations. This discrepancy is overcome by incorporating an empirical relation for the interfacial shell, emphasizing the critical role of CNT-matrix interactions and agglomeration in enhancing the effective properties of the NCR region and the overall stiffness of NCRHC. To demonstrate the accuracy and applicability of the present approach, the prediction from the MFT model is validated with experimental results of two-phase nanocomposite while the multi-scale analysis results are compared with available experimental results for three-phase NCRHC, showing strong agreement. Subsequently, the effect of CNT aspect ratio, agglomeration parameters, interfacial shell properties, and matrix modulus on the effective stiffness of NCRHC are thoroughly examined. The study also highlights optimal CNT fiber concentrations that improve the effective properties of the three-phase hybrid composite, while mitigating the detrimental effects of agglomeration and interfacial issues.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110273"},"PeriodicalIF":7.1,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143882510","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}

引用次数: 0

Gray area mitigation in grid-adaptive simulation for wall-bounded turbulent flows 壁面湍流网格自适应模拟中的灰色区域缓解

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-04-23 DOI: 10.1016/j.ijmecsci.2025.110305

Guangyu Wang , Yumeng Tang , Yangwei Liu

{"title":"Gray area mitigation in grid-adaptive simulation for wall-bounded turbulent flows","authors":"Guangyu Wang , Yumeng Tang , Yangwei Liu","doi":"10.1016/j.ijmecsci.2025.110305","DOIUrl":"10.1016/j.ijmecsci.2025.110305","url":null,"abstract":"<div><div>Wall-bounded turbulence is a pivotal phenomenon in fluid dynamics, especially in aerodynamics and aeronautics. Traditional hybrid Reynolds-averaged Navier–Stokes (RANS) and large eddy simulation (LES) methods often encounter difficulties in accurately predicting wall-bounded turbulent flows due to the gray area issues. In this study, the performance of various hybrid RANS-LES methods (HRLMs) across three quintessential wall-bounded turbulent flow scenarios is rigorously evaluated. The fully developed turbulent channel flow, flow over periodic hills, and flow over a NASA wall-mounted hump are tested. Comparisons are conducted between the recently proposed grid-adaptive simulation (GAS) method and established HRLMs, including scale-adaptive simulation (SAS) and delayed detached eddy simulation (DDES). Compared with SAS and DDES, GAS method reduces the relative error of the reattachment location and the turbulent Reynolds stress in the core recirculation region by over 60 % on identical coarse computational grids. The gray area issues in SAS and DDES are pronounced under low-resolution grids, especially in wall-bounded separation flows due to severe resolved turbulent stress depletion (RSD), and the predictions are even worse than RANS models. Further investigation reveals that both SAS and DDES markedly overestimate turbulent viscosity within the shear layer. Conversely, the turbulent viscosity within the shear layer is adeptly adjusted by the GAS method, leveraging local turbulent and grid length scales. Hence, more accurate predictions for mean flow and turbulence statistics are obtained. For gray area mitigation, the GAS method can adapt to low-resolution grids without additional empirical modifications, which has good potential for engineering applications.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110305"},"PeriodicalIF":7.1,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891740","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}

引用次数: 0

Dynamic mechanical behaviors and cracking mechanisms of non-straight flaws in tuff 凝灰岩非直裂纹的动态力学行为及开裂机理

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-04-23 DOI: 10.1016/j.ijmecsci.2025.110303

Gang Sun , Junxiang Wang , Jieru Tian , Ruibin Han , Jinlu Ba , Hao Wang , Haiyue Yu

{"title":"Dynamic mechanical behaviors and cracking mechanisms of non-straight flaws in tuff","authors":"Gang Sun , Junxiang Wang , Jieru Tian , Ruibin Han , Jinlu Ba , Hao Wang , Haiyue Yu","doi":"10.1016/j.ijmecsci.2025.110303","DOIUrl":"10.1016/j.ijmecsci.2025.110303","url":null,"abstract":"<div><div>The cracking mechanisms in rock containing non-straight flaws under dynamic loading remain poorly understood. To study the effect of flaw inclination on the mechanical properties and cracking mechanism in tuff with non-straight flaws under dynamic load, a dynamic compression test was carried out using a large-diameter split Hopkinson pressure bar device. Based on the uni-bond dual-parameter peridynamics model, a rate-dependent rock dynamic damage model was constructed. The paired-particle algorithm was combined with OpenMP parallelization to establish an efficient method for simulating the dynamic failure of flawed rock. The method was used to investigate the 3D crack propagation process and cracking mechanism in tuff specimens with non-straight flaws. The results show that with the increase in the flaw inclination angle, the dynamic strength, crack initiation stress, and the ratio of crack initiation stress to peak stress gradually decrease, and the failure mode of the specimen changes from shear failure to tensile-shear failure and then to conjugate shear failure. Cracks in rock specimens with non-straight flaws will not only initiate from the tip of a pre-existing flaw, but also from the convex point of the pre-existing flaw. The maximum crack propagation speed observed is 762∼1040 m/s, which is 0.35∼0.48 times the Rayleigh wave velocity. The displacement trend lines on both sides of the crack surface and the calculated normal and tangential displacement components enable discerning five cracking mechanisms. The research results reveal the cracking mechanisms in flawed rock masses and provide a theoretical basis for underground engineering projects.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"295 ","pages":"Article 110303"},"PeriodicalIF":7.1,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143882182","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}

引用次数: 0

Aero-engine blade error distributions predictions using novel machine learning models 利用新型机器学习模型预测航空发动机叶片误差分布

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-04-22 DOI: 10.1016/j.ijmecsci.2025.110262

Hua Yang , Haoning Wang , Qiangfei Huang , Xingfu Wu , Wenbin Ji , Zirui Li , Xu Han

{"title":"Aero-engine blade error distributions predictions using novel machine learning models","authors":"Hua Yang , Haoning Wang , Qiangfei Huang , Xingfu Wu , Wenbin Ji , Zirui Li , Xu Han","doi":"10.1016/j.ijmecsci.2025.110262","DOIUrl":"10.1016/j.ijmecsci.2025.110262","url":null,"abstract":"<div><div>The milling of thin-walled aero-engine blades presents substantial challenges due to their complex geometry. Accurate prediction of milling error distributions is critical for ensuring machining stability and precision. However, traditional mechanistic models suffer from high complexity and limited adaptability, and most existing data-driven methods often predict only single error values without capturing the full distribution of errors. To bridge this gap, this study proposes a novel Gaussian Mixture Model-based Error Distribution Prediction (GMM-EDP) framework that models the probability distribution of milling errors rather than just point estimates, which, to our knowledge, has not been done in prior studies. Two high-quality experimental datasets were generated after milling 44 blades and 34 impellers, incorporating key machining parameters as inputs. The GMM-EDP framework uses a Gaussian mixture model to characterize complex error distributions and a multi-output machine learning model to predict distributional features. Comprehensive evaluation using Jensen–Shannon divergence, Hellinger distance, total variation distance, and root mean square error (RMSE) demonstrates the framework’s accuracy and robustness. The proposed approach shows excellent generalization across different machining conditions. Results confirm that the GMM-EDP framework not only significantly improves the precision of milling error predictions but also provides deeper insights into machining consistency and uncertainty, which are critical for optimizing process parameters and improving the quality and reliability of thin-walled blade production.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"295 ","pages":"Article 110262"},"PeriodicalIF":7.1,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864185","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}

引用次数: 0

Lightweight design and verification of space harmonic drive 空间谐波传动的轻量化设计与验证

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-04-22 DOI: 10.1016/j.ijmecsci.2025.110302

Ruixing Li , Guangwu Zhou , Junjie Huang , Junyang Li

{"title":"Lightweight design and verification of space harmonic drive","authors":"Ruixing Li , Guangwu Zhou , Junjie Huang , Junyang Li","doi":"10.1016/j.ijmecsci.2025.110302","DOIUrl":"10.1016/j.ijmecsci.2025.110302","url":null,"abstract":"<div><div>As the key component of space mechanism, the lightweight design of harmonic drive can significantly reduce the inertia of mechanism and enhance the payload. It is of great significance to the development of space equipment. In this paper, a novel lightweight design method for harmonic drive has been proposed. The structure and gear tooth profile of the harmonic reducer is designed based on modified polyether ether ketone (PEEK). The meshing forces and stresses of the PEEK rigid wheel harmonic drive (PRWHD) are analyzed considering the effect of assembly preload force. The transmission efficiency model of PRWHD is developed for variable speed and load. The PRWHD is manufactured and the weight of the PRWHD is reduced by 38 %. The flexspline stress can be reduced by 68.67 % and the torsional stiffness of the reducer is increased by 40 %. The influence of the preload force on the transmission performance is more obvious at smaller loads. Compared to steel rigid wheel harmonic drive, the transmission efficiency of the PRWHD remains virtually unchanged. PRWHD has a higher number of meshed teeth, and it shows a significant advantage in terms of performance. PRWHD will have great potential to be used in space mechanisms in the future.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110302"},"PeriodicalIF":7.1,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143894488","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}

引用次数: 0

Oblique compression instability prediction and crashworthiness design for hybrid tube 混合动力管斜压失稳预测及耐撞设计

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-04-22 DOI: 10.1016/j.ijmecsci.2025.110292

Baichuan Liu, Hongyu Liang, Chunda Lu, Dengfeng Wang

{"title":"Oblique compression instability prediction and crashworthiness design for hybrid tube","authors":"Baichuan Liu, Hongyu Liang, Chunda Lu, Dengfeng Wang","doi":"10.1016/j.ijmecsci.2025.110292","DOIUrl":"10.1016/j.ijmecsci.2025.110292","url":null,"abstract":"<div><div>CFRP/aluminum hybrid multi-cell tubes have excellent potential as energy absorbing structures for passenger cars due to their excellent energy absorption characteristics and good designability, but the identification of unstable deformation mode is crucial for energy-absorption regulation. The innovation of this paper lies in the proposal of a universal characterization and prediction method for the oblique compression instability of CFRP/Al hybrid tube. First, a high-precision finite element model of CFRP/Al hybrid tube under multi-angle compression conditions is established and verified through experiments. Second, through the induction and summary of the deformation process, the concept of critical instability angle is introduced. Based on this, a universal characterization method for global bending mode is established and verified. Third, a prediction model for the oblique compression deformation mode of hybrid multi-cell tube based on Support Vector Machine is established. Furthermore, a prediction method for the critical instability angle is proposed and verified. Finally, an integrated multi-objective optimization design model for crashworthiness and lightweight considering the critical instability angle is established, and the influence of the critical instability angle on the optimization solution is discussed. The results show that if the critical instability angle is improperly designed, it will lead to a significant reduction in the energy absorption efficiency of the structure or the presence of substantial design redundancy. This research provides methodological guidance for the integrated design of crashworthiness and lightweight of multi-material thin-walled structures facing energy absorption requirements under multiple loading conditions.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110292"},"PeriodicalIF":7.1,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143894626","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}

引用次数: 0