Archive of Applied Mechanics最新文献

{"title":"Effects of bedding plane dip angle and lithology on the mechanical and micro-failure behavior of stratified rock under uniaxial compression test","authors":"Yaoyao Meng,&nbsp;Hao Chen,&nbsp;Hongwen Jing,&nbsp;Qian Yin,&nbsp;Xiaowei Liu,&nbsp;Ke Ding","doi":"10.1007/s00419-024-02754-8","DOIUrl":"10.1007/s00419-024-02754-8","url":null,"abstract":"<div><p>To investigate the mechanical and micro-failure behavior of stratified rock, a series of uniaxial compression and CT scanning tests of stratified limestone and sandstone at different bedding plane dip angles (<i>α</i>) were conducted. The experimental results showed that with the increasing <i>α</i>, uniaxial compressive strength (UCS), peak strain (<i>ε</i>_1p), Poisson’s ratio (<i>μ</i>) of stratified limestone and sandstone all first decreased and then increased, elastic modulus (<i>E</i>) of stratified limestone continuously increased, <i>E</i> of stratified sandstone first decreased and then increased. At different <i>α</i>, UCS and <i>E</i> of stratified limestone were larger than that of stratified sandstone, <i>ε</i>_1p and <i>μ</i> of stratified limestone were smaller than that of stratified sandstone. For stratified limestone, anisotropy coefficient of <i>μ</i> was the largest and anisotropy coefficient of <i>E</i> was the smallest. For stratified sandstone, anisotropy coefficient of <i>ε</i>_1p was the largest and anisotropy coefficient of <i>E</i> was the smallest. Anisotropy degree of stratified limestone and sandstone was approaching for UCS. Anisotropy degree of stratified limestone was larger than stratified sandstone for <i>ε</i>_1p and <i>μ</i>. Anisotropy degree of stratified limestone was smaller than stratified sandstone for <i>E</i>. The failure category of stratified limestone and sandstone at different <i>α</i> was quite different. Due to differences in failure mode, the morphology and distribution characteristics of micro-cracks along the sample height showed a significant difference. With the increasing <i>α</i>, volume fraction (VF) and the maximum area fraction (AF) first decreased and then increased for stratified limestone, and showed no obvious change trend for stratified sandstone. At <i>α</i> = 0º, 30º, 90º, VF and the maximum AF of stratified limestone were significantly larger than that of stratified sandstone. At <i>α</i> = 60º, VF and the maximum AF of stratified sandstone were larger than that of stratified limestone.</p></div>","PeriodicalId":477,"journal":{"name":"Archive of Applied Mechanics","volume":"95 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142939175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flow of a micropolar drop in an impermeable micropolar circular pipe","authors":"Ahmed G. Salem","doi":"10.1007/s00419-024-02738-8","DOIUrl":"10.1007/s00419-024-02738-8","url":null,"abstract":"<div><p>In light of the blood cells motion inside the vein or artery, there is no knowledge available about the importance of the flow of a non-deformable micropolar drop inside a circular cylindrical pipe filled with a micropolar fluid. This paper provides a two-fluid phase motion problem of an axially symmetrical quasisteady movement of a micro-structure fluid drop embedded in another micro-structure fluid of micropolar kind on the axis of an impermeable cylindrical pipe that is discussed under the low Reynolds number conditions. The interfacial tension between the immiscible fluid phases at the drop’s interface is assumed to be very large to ensure that the droplet remains spherical in shape. Also, the microrotation and couple stress relations at the droplet’s interface are used. The general solutions for the differential equations are fulfilled by the stream functions of the micropolar fluids, which are constructed by combining fundamental solutions in cylindrical and spherical coordinates, and then the conditions on the boundaries are fulfilled at the inner surface of the pipe by the Fourier-transform and also at the interface of the drop using collocation methods. The paper’s significance is to discuss and see the effectiveness of the pipe’s inner surface on the hydrodynamic normalised force influencing the drop sphere because of its filling with and existence in a micropolar fluid. Findings indicate that the hydrodynamic normalised force is increasing monotonically with the increase of the droplet-to-pipe radius ratio, and tends to infinity when the droplet’s interface touches the pipe’s inner surface. Additionally, the findings show that when the micropolarity parameters increase, so does the normalised drag force. Our findings for the normalised force agree well with the solutions that are provided in publications. The current study is also significant in the domains of industrial and biomedical operations like coagulation, sedimentation, and rheology of suspension, to name a few.</p></div>","PeriodicalId":477,"journal":{"name":"Archive of Applied Mechanics","volume":"95 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00419-024-02738-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142939161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Modified Vlasov beam model considering additional displacements induced by rotation deformation of asymmetric section beams","authors":"Yong Cai,&nbsp;Xueqi Li,&nbsp;Xiaoyong Lv,&nbsp;Liupeng Li","doi":"10.1007/s00419-024-02756-6","DOIUrl":"10.1007/s00419-024-02756-6","url":null,"abstract":"<div><p>Vlasov theory of thin-walled beams neglects additional displacements induced by rotation of beam sections, which results in significant errors in calculating dynamic responses. In this study, additional lateral and vertical displacements and additional torques are introduced to modify Vlasov theory of thin-walled beams and a modified Vlasov beam model of asymmetric cross-sectional beams established. And then, a typical simply supported beam serves as a case in point to present a comprehensive analytical framework for the forced vibration analysis of beams with asymmetric sections. Subsequently, a beam element considering additional displacements is derived based on the principle of minimum potential energy. Notably, the proposed models and elements are versatile and applicable to various cross-sectional types. Finally, the impact of additional displacements on the forced vibration and the resonance of asymmetric cross-sectional beams is investigated under various boundary conditions. It is indicated that the impact of additional displacements becomes pronounced as boundary constraints are enhanced and should be considered in the dynamics analyses of beams. Moreover, as for an asymmetric cross-sectional beam, limiting torques can reduce its dynamic responses in the practical engineering. Additionally, additional displacements have a greater impact on torsional and lateral displacements instead of vertical displacements during vertical resonance.</p></div>","PeriodicalId":477,"journal":{"name":"Archive of Applied Mechanics","volume":"95 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 decoupling method for dynamic modeling of wind turbine gearbox with planet gear journal bearings","authors":"Wenjun Fei,&nbsp;Jianjun Tan,&nbsp;Hao Tang,&nbsp;Hao Li,&nbsp;Caichao Zhu,&nbsp;Zhangdong Sun,&nbsp;Hongxia Wang","doi":"10.1007/s00419-024-02748-6","DOIUrl":"10.1007/s00419-024-02748-6","url":null,"abstract":"<div><p>Planet gear journal bearing (PGJB) is usually modeled by nonlinear film force or linear stiffness-damping coefficient in the dynamic modeling of wind turbine gearbox (WTG) with PGJB. The former has high simulation accuracy but a high computational cost; the latter has high computational efficiency but neglects time-varying film force and journal-sleeve eccentricity, leading to limited simulation accuracy. In this study, an improved dynamic modeling approach of PGJB is proposed considering the time-varying journal-sleeve eccentricity and additional eccentricity correction force based on the linear stiffness-damping coefficient. A rigid-flexible coupling dynamic model of WTG with PGJB is established, considering the structural flexibility of gearbox housing, carrier, ring gear, and shafts, as well as the dynamic supporting forces of PGJB. The influences of operating conditions and PGJB’s parameters on calculation accuracy and dynamic characteristics of WTG are studied and partially verified by an initial experiment. The results show that the dynamic meshing force fluctuation makes PGJB’s stiffness-damping coefficient and additional eccentricity correction force change periodically. The proposed model accurately predicts system response within boundary conditions, especially a prediction error of 10% in planet gear vibration displacements at the rated operating condition. Decreasing the width-to-diameter ratio and radial clearance of PGJB and increasing input torque improve the load-sharing performance of WTG.</p></div>","PeriodicalId":477,"journal":{"name":"Archive of Applied Mechanics","volume":"95 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142925706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Iterative algorithm for the conformal mapping from the unit disk to domains with regular boundaries","authors":"Kai He,&nbsp;Chang Peng","doi":"10.1007/s00419-024-02749-5","DOIUrl":"10.1007/s00419-024-02749-5","url":null,"abstract":"<div><p>Conformal mapping functions have significant applications in mechanics and other fields, and their computation methods have drawn considerable attention. We propose an iterative algorithm to compute the conformal mapping from the unit disk to physical domains with regular boundaries, defined by having only prime ends of the first kind. The mapping function is expanded into a Laurent series and use its truncated partial sum as an approximation. The Schwarz–Christoffel mapping formula provides the initial estimates for the series coefficients, which are then iteratively optimized. This algorithm efficiently handles complex domain shapes, such as winding orifices and slits, with high computational speed. Moreover, it offers valuable insights for designing algorithms to solve other types of conformal mapping problems and has practical significance in applications involving conformal mappings.</p></div>","PeriodicalId":477,"journal":{"name":"Archive of Applied Mechanics","volume":"95 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142912798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 comprehensive model for thermo-hydromechanical behavior in nonlocal poroelastic semiconductors under laser excitation","authors":"Khaled Lotfy,&nbsp;Ibrahim S. Elshazly,&nbsp;Borhen Halouani,&nbsp;Praveen Ailawalia,&nbsp;Alaa A. El-Bary","doi":"10.1007/s00419-024-02744-w","DOIUrl":"10.1007/s00419-024-02744-w","url":null,"abstract":"<div><p>This study introduces a generalized photothermal model to analyze the coupled thermo-hydromechanical behavior of a poroelastic, nonlocal semiconductor medium subjected to laser excitation. The medium is modeled as a saturated, dynamic, poroelastic half-space under time-harmonic loads, including thermal and mechanical forces and plasma electron distribution induced by laser pulses. A novel framework that integrates photo-thermoelasticity with hydrodynamic and poroelastic effects, capturing the nonlocal interactions at the nanoscale. At first, we subjected this medium to time-harmonic loads comprising thermal and normal loads and a distribution of plasma electrons applied with heating laser pulses. Afterward, we compared the photo-thermoelastic dynamic models to the coupled thermo-hydromechanical ones. The resulting nondimensional coupled equations were solved using two-dimensional normal mode analysis. The resulting nondimensional coupled equations were solved using two-dimensional normal mode analysis. The study examined the effects of nondimensional displacement, mechanical stress, excess pore water pressure, carrier concentration (density), and temperature distribution on the poroelastic half-space medium. Graphical representations were produced to highlight these effects based on specific parameters.</p></div>","PeriodicalId":477,"journal":{"name":"Archive of Applied Mechanics","volume":"95 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142925727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural analysis of the isotropic composites by combining limit analysis with artificial neural networks","authors":"Jun-Hyok Ri,&nbsp;Hyon-Sik Hong","doi":"10.1007/s00419-024-02734-y","DOIUrl":"10.1007/s00419-024-02734-y","url":null,"abstract":"<div><p>In this paper, we describe an approach for the structural analysis of isotropic composite structures by combining the reduced order model of limit analysis with artificial neural networks (ANN). At first, the ANN is introduced in order to represent the effective strength surface of isotropic composites implicitly in the macro principal stress space. The input neurons are the macro principal stress components, while ANN output neuron is the limit load factor. In order to estimate the limit load factor, the reduced order model of limit analysis for the representative volume element is used. Then, the structural analysis can be easily implemented in the computational framework of the FEM. Macro stress is evaluated by using the elastic analysis of the homogenized composite structure, and the safety is estimated via the effective strength surface represented by ANN. As a result, structural analysis of composites can be reduced into that of common homogeneous materials. Numerical examples show that the proposed method is an efficient approach of the structural analysis of composites structures.</p></div>","PeriodicalId":477,"journal":{"name":"Archive of Applied Mechanics","volume":"95 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142906083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 phenomenological aging-damage hyperelastic model based on configurational mechanics for short fiber-reinforced rubber composites","authors":"Shenghao Chen,&nbsp;Chunguang Wang,&nbsp;Qun Li","doi":"10.1007/s00419-024-02746-8","DOIUrl":"10.1007/s00419-024-02746-8","url":null,"abstract":"<div><p>The damage and aging of short fiber-reinforced rubber composites (SFRCs) have a significant impact on the performance and stability of associated products. However, the presence of internal short fibers and the large deformation characteristics of rubber materials make it difficult to characterize the damage behavior. Therefore, it is imperative to investigate the material’s damage behavior, as well as the influence of aging on mechanical properties, and develop a precise constitutive model. This study extends configurational mechanics to hyperelastic materials and introduces the concept of equivalent configurational stress as a physically meaningful variable representing damage, thereby establishing a constitutive model that couples aging and damage. Uniaxial tensile tests were performed on samples in various aging states to analyze the damage behavior of SFRCs and validate the accuracy of the proposed constitutive model. Furthermore, this research highlights the prospective application of configuration mechanics in characterizing damage in composite materials.</p></div>","PeriodicalId":477,"journal":{"name":"Archive of Applied Mechanics","volume":"95 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coupling of peridynamics with finite elements for brittle fracture problems in irregular meshgrids","authors":"Shenhua Liu,&nbsp;Weizhong Chen,&nbsp;Jingqiang Yuan","doi":"10.1007/s00419-024-02731-1","DOIUrl":"10.1007/s00419-024-02731-1","url":null,"abstract":"<div><p>A PD-FEM coupling scheme with the potential to solve large-scale or multi-scale models is proposed which utilizes the advantages of PD in solving discontinuities and the computational efficiency of the finite element method. The scheme can perform the global unstructured discretization of the model, ensure that the crack initiation and propagation are not affected by the grid, and the boundary conditions can be flexibly arranged. The non-overlapping domain coupling method is used to couple the finite element domain and the circumferential dynamic domain to reduce the influence of the ghost force on the model solution. In order to verify the ghost force, the proposed PD-FEM model is used to simulate the displacement field distribution of the two-dimensional plate under uniaxial tension and the cantilever beam under concentrated force. The calculation results are compared with the theoretical calculation results and finite element calculation results. In addition, the scheme takes advantage of the high computational efficiency of the finite element method, and uses the OpenMP parallel computing framework of Fortran language to realize the efficient solution of the three-dimensional model. The validity and computational efficiency of the PD-FEM model are verified by the tensile test of the prefabricated cracked square plate, the double-notched specimen, the three-dimensional l-shaped plate and the composite mode fracture test of the three-dimensional three (four) point bending beam.</p></div>","PeriodicalId":477,"journal":{"name":"Archive of Applied Mechanics","volume":"95 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of CNTs distributions on three-dimensional vibration of sandwich plates with functionally-graded face sheets","authors":"Yushan Xiao,&nbsp;Senlin Zhang,&nbsp;Zhen Wu,&nbsp;Jie Zhou,&nbsp;Zhengliang Liu,&nbsp;Xiaohui Ren","doi":"10.1007/s00419-024-02743-x","DOIUrl":"10.1007/s00419-024-02743-x","url":null,"abstract":"<div><p>For a thick sandwich plate, transverse stretching vibration and in-plane vibration might occur before bending vibration in practical applications, which may threaten the dynamic safety of composite structures. Therefore, this work attempts to improve the in-plane and transverse stretching stiffness of sandwich structures by using carbon nanotubes (CNTs) to reinforce face sheets. To this end, it is necessary to understand well the influence of CNTs distributions on the three-dimensional (3D) vibration of functionally graded sandwich plates. Therefore, an extended global–local higher-order model will be proposed to accurately predict 3D vibration behaviors of sandwich structures reinforced by the CNTs, as the existing equivalent single-layer models will encounter difficulties in accurately analyzing such issues. Based on the proposed model, analytical solutions and finite element formulation have been presented to study the dynamic behaviors of sandwich plates with reinforcement of the CNTs, which have been verified by 3D elasticity solutions and three-dimensional finite element results. Moreover, the influence of the CNTs distributions and volume fractions on the vibration behaviors of sandwich plates has been investigated. Finally, by selecting appropriate profiles of the CNTs through the thickness, the in-plane and transverse stretching stiffness of sandwich structures can be significantly improved.</p></div>","PeriodicalId":477,"journal":{"name":"Archive of Applied Mechanics","volume":"95 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}