Xulong Li (, ), Sha Wei (, ), Hu Ding (, ), Liqun Chen (, )
{"title":"Interval uncertain responses of fluid-conveying pipes via Chebyshev inclusion and multi-scale analysis","authors":"Xulong Li \u0000 (, ), Sha Wei \u0000 (, ), Hu Ding \u0000 (, ), Liqun Chen \u0000 (, )","doi":"10.1007/s10409-026-51204-x","DOIUrl":"10.1007/s10409-026-51204-x","url":null,"abstract":"<div><p>Fluid-conveying pipes inevitably exhibit uncertainties in parameters that critically impact response predictions. This study presents an analysis of the responses of elastically supported fluid-conveying pipes under interval uncertainty. By integrating Chebyshev inclusion functions with the multi-scale analysis, the lower and upper bounds of amplitude-frequency responses are determined. Comparison with the scanning method confirms the efficiency and accuracy of the analysis approach. The response intervals are then determined by considering uncertainties in fluid speed, linear support stiffness, and nonlinear support stiffness. The effects of uncertainties in support parameters at the inflow and outflow ends, as well as variations in stiffness ratios, on the response intervals are thoroughly examined. The results show that the uncertain fluid speed impacts the system response within the detuning frequency range of the analytical solution, while uncertain linear support stiffness primarily affects the resonant zone. The impacts of uncertainties in linear stiffness at the inflow and outflow supports differ significantly and vary substantially with changes in the linear stiffness ratio. In comparison, when the nonlinear support stiffness is uncertain, the response interval is less affected by the location of the uncertainty (inflow/outflow) and by the nonlinear stiffness ratio between the two end supports.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149034500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Magnetically controlled group velocity of obliquely incident SH waves in periodically layered magneto-active elastomers","authors":"Wei Jiang \u0000 (, ), Yingjie Chen \u0000 (, ), Neda Karami Mohammadi, Nitesh Arora, Weiqiu Chen \u0000 (, ), Stephan Rudykh, Bin Wu \u0000 (, )","doi":"10.1007/s10409-026-60353-x","DOIUrl":"10.1007/s10409-026-60353-x","url":null,"abstract":"<div><p>Controlling elastic or acoustic wave propagation through material and structural design enables functionalities such as vibration isolation and noise reduction, while active tunability beyond single-frequency operation is essential for practical engineering applications. This study investigates the propagation of shear horizontal waves in periodically layered magneto-active elastomers under an external magnetic field. We analyze two loading paths—fixed in-plane pre-stretch and unconstrained deformation—while considering magnetostrictive and strain-stiffening effects. Using nonlinear magneto-elasticity and the transfer matrix method, we derive analytical expressions for dispersion relations and group velocity. Numerical results show that magnetic intensity, finite deformation, and incidence angles significantly influence wave characteristics. Specifically, magnetic loading enables tunable switching between positive and negative group velocities. This effect is most efficient at small incidence angles and becomes restricted at larger angles. Furthermore, unconstrained deformation offers a wider, more oscillatory tunability range compared to the fixed-stretch case. These findings provide new theoretical insights and offer practical guidance for designing soft intelligent devices with actively tunable group velocities.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149034847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jinyu Ji (, ), Kai Zhang (, ), Xiaogang Guo (, ), Daining Fang (, )
{"title":"Failure behavior of alumina ceramic plates under multiple high-energy pulsed laser irradiation","authors":"Jinyu Ji \u0000 (, ), Kai Zhang \u0000 (, ), Xiaogang Guo \u0000 (, ), Daining Fang \u0000 (, )","doi":"10.1007/s10409-026-60060-x","DOIUrl":"10.1007/s10409-026-60060-x","url":null,"abstract":"<div><p>This study investigates the failure behavior of alumina ceramic plates under nanosecond high-energy pulsed laser irradiation through combined experiments and numerical modeling. Laser tests were conducted with single-pulse energies from 15 to 60 J and pulse numbers ranging from 1 to 5. Three characteristic damage mechanisms were identified: a heat-affected zone and shock-damaged zone on the front surface, and a spall fracture zone on the rear free surface. Spallation was found to be the dominant failure mode, progressively expanding under repeated pulses and ultimately causing perforation and macroscopic fracture. Microscopic observations reveal that front-surface damage results from coupled thermal ablation and mechanical shock effects, whereas rear-surface spallation is governed by dynamic tensile fracture induced by stress-wave reflection at the free surface. Three-dimensional profilometry shows that spall depth increases with increasing single-pulse energy. Notably, under identical total laser energy, multiple low-energy pulses produce a higher spall growth rate than fewer high-energy pulses. The developed numerical model accurately predicts the macroscopic dimensions of the spall region, demonstrating good agreement with experimental results.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wei Xiong (, ), Wenlong Zhang (, ), Jiamin Wang (, ), Chuang Liu (, ), Mengting Tan (, ), Xianfeng Zhang (, )
{"title":"Hypervelocity impact resistance of sandwich panels with Al/PTFE cores subjected to metal jet penetration","authors":"Wei Xiong \u0000 (, ), Wenlong Zhang \u0000 (, ), Jiamin Wang \u0000 (, ), Chuang Liu \u0000 (, ), Mengting Tan \u0000 (, ), Xianfeng Zhang \u0000 (, )","doi":"10.1007/s10409-026-60009-x","DOIUrl":"10.1007/s10409-026-60009-x","url":null,"abstract":"<div><p>Al/PTFE is one of the most typical reactive materials with high energy release capability. This paper explored the resistance of sandwich panels with Al/PTFE cores to hypervelocity jet impact, focusing on the coupled mechanism between the shock-induced chemical reaction of the Al/PTFE core and the deformation of steel face sheets. The impact resistance of the sandwich panel was investigated by jet penetration experiments. The morphology of the metal jet was directly observed using an X-ray radiography facility. Furthermore, numerical simulations were performed to deeply analyze the interaction mechanism between the jet and sandwich panels. Results showed that the Al/PTFE core experienced a non-self-sustaining reaction and energy release during the penetration, which caused the deformation of both face sheets that disturbed the motion of metal jets. As a result, the Al/PTFE-core sandwich panel disturbed the metal jet obviously, ultimately leading to the decrease in residual penetration capacity of the jet by 30.7% and 45.0%, in contrast to experiments with AISI1045 steel-core sandwich panels with the same areal density and those without any sandwich panels, respectively. This research offers a novel perspective on employing reactive materials in composite armor against jet penetration.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Adaptive three-dimensional finite volume method with Walsh basis function","authors":"Gang Wang \u0000 (, ), Yuan Gan \u0000 (, ), Jiong Ren \u0000 (, )","doi":"10.1007/s10409-026-51220-x","DOIUrl":"10.1007/s10409-026-51220-x","url":null,"abstract":"<div><p>In previous work, the finite volume method with Walsh basis functions (FVM-WBF) has demonstrated superior shock-capturing within cells, inherent multigrid properties, and a concise, highly efficient adaptive performance in solving two-dimensional Euler equations. Building on the aforementioned progress, the present study extends the adaptive algorithm to three-dimensional FVM-WBF framework. Informed by the flow features identified by the flow-structure detector, the adaptive scheme dynamically adjusts the number of WBFs in each computational cell, allocating additional functions to regions with rich flow features to enhance resolution while reducing the basis count in smooth regions to cut computational cost. Compared with conventional adaptive approaches that require complex mesh coarsening/refinement and interpolation/reconstruction of flow variables, the presented adaptive FVM-WBF method is more straightforward and easier to implement, which achieves its adjustment of Walsh basis series solely by transmitting the corresponding coefficients of the Walsh functions. A suite of three-dimensional steady test cases demonstrates that the proposed adaptive FVM-WBF method delivers outstanding numerical performance: it flexibly chooses the local basis cardinality in accordance with the flow structure, simultaneously enhancing resolution and markedly improving computational efficiency.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yong Zhao (, ), Yixuan Ge (, ), Hong Zhang (, ), Xu Qian (, )
{"title":"Multiple-relaxation-times lattice Boltzmann models for nonlinear advection equation","authors":"Yong Zhao \u0000 (, ), Yixuan Ge \u0000 (, ), Hong Zhang \u0000 (, ), Xu Qian \u0000 (, )","doi":"10.1007/s10409-026-51227-x","DOIUrl":"10.1007/s10409-026-51227-x","url":null,"abstract":"<div><p>In this paper, we propose two multiple-relaxation-time lattice Boltzmann models for the nonlinear advection equation, which can be transformed into an advection-diffusion equation by introducing an anisotropic diffusion term. Through rigorous Chapman-Enskog analysis, we verify that the governing equation is correctly recovered from the present models. Comprehensive numerical simulations are performed across one-, two-, and three-dimensional scenarios, including linear/nonlinear advection equations and solid-phase transport problems, covering both smooth and discontinuous initial conditions. Accuracy order tests confirm that both proposed models exhibit second-order spatial accuracy. The numerical results demonstrate that the present models not only achieve excellent agreement with analytical solutions and existing numerical results for smooth cases but also outperform existing lattice Boltzmann models in handling discontinuous initial conditions, with significantly reduced numerical oscillations.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Frequency response of the unsteady separating boundary layers in a compressor cascade","authors":"Taiyang Wang \u0000 (, ), Benshuai Lyu \u0000 (, ), Yaomin Zhao \u0000 (, )","doi":"10.1007/s10409-026-51235-x","DOIUrl":"10.1007/s10409-026-51235-x","url":null,"abstract":"<div><p>Direct numerical simulations are performed for a compressor cascade at an inlet Reynolds number of 138500 and a Mach number of 0.15. Due to the complex pressure gradient, the blade boundary layer shows complex separation phenomena, including shedding separation on the suction-side and closed separation bubbles on the pressure-side. Spatial linear stability analysis, space-time Fourier transform of the wall-pressure signals, and forced Navier-Stokes simulations are employed to investigate the frequency response of unsteady separation and its acoustic signature. On the suction side, the boundary layer is found to be absolutely unstable, whereas that on the pressure side is convectively unstable. Upstream-propagating acoustic waves originate from the trailing edge due to the scattering of downstream-convecting hydrodynamic disturbances. In the effective laminar case (3DL) showing tonal noise, a closed acoustic feedback loop is established between the suction-side braid region and the trailing edge, which produces a set of evenly spaced secondary tones that are consistent with phase-closure predictions. Furthermore, the dominant tone is selected by a near-wake instability. In contrast, in the turbulent case (3DT) showing no tone, the mode-B instability disrupts phase coherence of the wall pressure and weakens the loop, thereby suppressing tonal peak. The results suggest that, in compressor cascades subject to strong adverse pressure gradients, absolute instability on the suction side can sustain a loop without leading-edge receptivity, while three-dimensionality provides an effective route to tone suppression.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 11","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dynamic response of a heterogeneous elastic adhesion interface through receptor-ligand bonds under cyclic tensile loading","authors":"Jiawen Ruan \u0000 (, ), Long Li \u0000 (, ), Jizeng Wang \u0000 (, )","doi":"10.1007/s10409-026-25991-x","DOIUrl":"10.1007/s10409-026-25991-x","url":null,"abstract":"<div><p>Cell adhesion mediated by receptor-ligand bonds is essential for numerous physiological processes, and its dynamics are strongly regulated by mechanical cues from the extracellular microenvironment, notably substrate heterogeneity and cyclic loading. While previous studies have largely focused on adhesion dynamics in uniformly elastic settings, the coupled role of spatial mechanical heterogeneity and time-varying loads remains underexplored at the molecular scale. Here, we establish a theoretical model of a heterogeneous elastic adhesion interface under dynamic tensile loading, integrating continuum mechanics with statistical thermodynamics to simulate stochastic bond dynamics, including diffusion, association, and dissociation. We show that under step displacement, adhesion clusters recede from stiff regions and accumulate in soft areas until reaching a steady configuration. Under cyclic loading, both adhesive force and adhesion patterns during steady-state cycles depend strongly on loading frequency. As frequency increases, the spatial distribution of bonds shifts from an axisymmetric pattern enriched near the contact edge to one concentrated predominantly in soft substrate regions. We further identify significant energy dissipation resulting from the hysteresis in bond association/dissociation, with a distinct optimal frequency that maximizes the loss factor, reflecting the dynamic competition between reaction kinetics and mechanical forcing. These results provide fundamental mechanical insights into how adhesion interfaces sense and respond to complex mechanical cues.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 11","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jiaqi He (, ), Changdong Jia (, ), Yurong Wang (, ), Yingming Zhao (, )
{"title":"Prediction of the flexural properties of poplar wood based on microstructure through machine learning","authors":"Jiaqi He \u0000 (, ), Changdong Jia \u0000 (, ), Yurong Wang \u0000 (, ), Yingming Zhao \u0000 (, )","doi":"10.1007/s10409-026-51109-x","DOIUrl":"10.1007/s10409-026-51109-x","url":null,"abstract":"<div><p>Understanding the fracture mechanism and establishing predictive model for the flexural properties are critical issues in composite materials research. However, accurately developing the nonlinear microstructure-based model remains inherently challenging, particularly for poplar wood, a typically natural fiber-reinforced composite. In this study, the fracture analysis and the predictive model of the flexural properties were evaluated by combining a multi-layered structural analysis encompassing the cell wall ultrastructure, the cells morphology, and the tissue proportion. As a result, key microstructural drivers of flexural properties were identified. The flexural properties were positively correlated with crystallinity, wall-to-lumen ratio, fiber proportion, and negatively correlated with microfibril angle and vessel lumen diameter. Post-failure fracture morphology revealed the presence of “weak points”, where stress mainly concentrated at the vessel wall pits and interface between multi-layered cell walls. The principal component analysis (PCA) algorithm effectively condensed nine microstructural features into four interpretable principal components. Although multiple linear regression (PCA-ML) and support vector machine regression models (PCA-SVR) both had thoroughly predictive ability, the performance of the PCA-SVR model was comprehensively improved. Specifically, the coefficients of determination of PCA-SVR of modulus of elasticity and modulus of rupture were 0.831 and 0.799. This study provides a scientific foundation for the design of wood-based composites with tailored flexural behavior.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A novel high-order scheme with consistent boundary closures and enhanced resolution properties","authors":"Xiaotong Chen \u0000 (, ), Jiaxian Qin \u0000 (, ), Xiaogang Deng \u0000 (, )","doi":"10.1007/s10409-026-60026-x","DOIUrl":"10.1007/s10409-026-60026-x","url":null,"abstract":"<div><p>In this work, a novel fifth-order scheme within the WCNS framework is constructed by combining the Hermite interpolation method with the hybrid compact difference schemes. This scheme significantly shortens the conventional template and provides enhanced spectral properties. Meanwhile, consistent boundary closures are also devised, such that the global accuracy is preserved and no ghost node is required in application. Fourier analysis and benchmark numerical tests are performed to validate the proposed scheme. The results show that the dispersion and dissipation of this scheme significantly outperform the traditional WCNS scheme, and a global fifth-order accuracy is successfully achieved. Excellent computational results are achieved in two-dimensional curvilinear grids and multi-block grids, verifying the effectiveness of the proposed scheme, especially the consistent boundary closures.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}