Acta Mechanica最新文献_第10页

Prediction of mechanical property of open-hole composite laminates using generalized regression neural network method 使用广义回归神经网络方法预测开孔复合材料层压板的力学性能

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2024-10-08 DOI: 10.1007/s00707-024-04025-7

Junling Hou, Mengfan Zhao, Yujie Chen, Qun Li, Chunguang Wang

{"title":"Prediction of mechanical property of open-hole composite laminates using generalized regression neural network method","authors":"Junling Hou, Mengfan Zhao, Yujie Chen, Qun Li, Chunguang Wang","doi":"10.1007/s00707-024-04025-7","DOIUrl":"10.1007/s00707-024-04025-7","url":null,"abstract":"<div><p>Mechanical connection is a common method used for joining composite materials, but it is bound to open holes in the composite material structure. These open holes may cause stress concentration at the hole edge, impacting the overall mechanical properties of the component. In this paper, a machine learning-based method for predicting the mechanical properties of open-hole composite laminates is proposed based on generalized regression neural network. In detail, by using the Hashin failure criterion, the finite element models of composite laminates with single holes of different diameters have been established. Their load–displacement curves, maximum failure stresses and maximum failure strains are calculated numerically. Then, the different hole diameters and corresponding load–displacements can be used as the input and output variables of the generalized regression neural network to train the neural network model. Based on the optimal generalized regression neural network model, the mechanical properties of the composite laminates with a certain single hole diameter can be predicted. Compared with the uniaxial tensile experiment of open-hole composite laminates, the effectiveness of this machine learning method is verified. Furthermore, the changes in mechanical properties of double-hole composite laminates under different hole diameters and positions are analyzed. This study holds significant practical implications for enhancing the understanding of the mechanical properties of composite materials and the influence of defects on their performance.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"235 12","pages":"7553 - 7568"},"PeriodicalIF":2.3,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737064","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}

引用次数: 0

Continuum modeling of gas–particle flows: an overview 气体粒子流的连续建模：概述

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2024-10-04 DOI: 10.1007/s00707-024-04104-9

Simon Schneiderbauer

引用次数: 0

Vibration and stability of functionally graded porous (FGP) sandwich plates under moving mass 运动质量作用下功能分级多孔（FGP）夹层板的振动和稳定性

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2024-10-04 DOI: 10.1007/s00707-024-04108-5

Dongdong Li, Dekang Kong, Ti Chen

引用次数: 0

Dynamic analysis of a spinning visco-elastic FG graphene platelets reinforced nanocomposite sandwich cylindrical shell with MRE core 带 MRE 内核的旋转粘弹性 FG 石墨烯平板增强纳米复合材料夹层圆柱形外壳的动态分析

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2024-10-04 DOI: 10.1007/s00707-024-04077-9

Ahmad A. Monajemi, Mehdi Mohammadimehr, Fatemeh Bargozini

{"title":"Dynamic analysis of a spinning visco-elastic FG graphene platelets reinforced nanocomposite sandwich cylindrical shell with MRE core","authors":"Ahmad A. Monajemi, Mehdi Mohammadimehr, Fatemeh Bargozini","doi":"10.1007/s00707-024-04077-9","DOIUrl":"10.1007/s00707-024-04077-9","url":null,"abstract":"<div><p>This paper investigates the dynamic responses of spinning FG GPLs reinforced with a nanocomposite sandwich cylindrical shell based on a magnetorheological elastomer (MRE) core subjected to thermomechanical loading and residual stress. The sandwich cylindrical shell is considered using the Donnell–Moshtari theory based on metal matrix nanocomposites; furthermore, GPLs are used with uniform and FG distribution in the thickness direction to reinforce these layers. The MRE core layer is modeled based on FSDT. The effect of temperature on the mechanical properties of MRE, GPLs, and metal matrix nanocomposites is considered. The mechanical properties of the nanocomposite sandwich shell are obtained based on the Halpin–Tsai micromechanics model and the rule of mixture. The equations of motion for a spinning sandwich shell are obtained by considering the rotary inertia and shear effect. The frequencies of a spinning shell are derived using the Differential Quadrature Method. The effect of parameters such as weight fraction and distribution of GPLs, MRE core, spinning speed, residual stresses, and thermomechanical loading on the dynamic behavior of spinning nanocomposite sandwich shells are studied.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"235 12","pages":"7497 - 7530"},"PeriodicalIF":2.3,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737192","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}

引用次数: 0

Hydro-thermo-mechanical coupled peridynamic modeling of freeze–thaw fracture of concrete 混凝土冻融断裂的水力-热力-力学耦合围动力模型

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2024-10-02 DOI: 10.1007/s00707-024-04109-4

Jiaming Zhang, Min Yu, Xihua Chu

引用次数: 0

Dynamic behavior of a class of predator–prey model with two time delays 一类具有两个时间延迟的捕食者--猎物模型的动态行为

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2024-10-01 DOI: 10.1007/s00707-024-04111-w

Youhua Qian, Meirong Ren, Haolan Wang

引用次数: 0

Revisiting visualization of spiral states in a wide-gap spherical Couette flow 重温宽间隙球形库埃特流中螺旋状态的可视化

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2024-10-01 DOI: 10.1007/s00707-024-04098-4

Isshin Arai, Tomoaki Itano, Masako Sugihara-Seki

{"title":"Revisiting visualization of spiral states in a wide-gap spherical Couette flow","authors":"Isshin Arai, Tomoaki Itano, Masako Sugihara-Seki","doi":"10.1007/s00707-024-04098-4","DOIUrl":"10.1007/s00707-024-04098-4","url":null,"abstract":"<div><p>A pioneering study conducted by Egbers and Rath [Acta Mech. 111 pp. 125–140 (1995)] experimentally captured spiral waves to elucidate the transition in the wide-gap spherical Couette flow. However, the physical field quantities of the spiral waves corresponding to light patterns of various intensities, as obtained in the experiment, remain unclear, and we have yet to move beyond the understanding that the reflected light from shear-sensitive flake tracers responds to a flow that appears at the transition. In this study, the experiment to visualize spiral waves using aluminum flakes, as performed by Egbers and Rath, was numerically reproduced by solving the translational and rotational motions of the particles in a spiral wave. First, the spiral wave in a spherical Couette flow with an aspect ratio <span>(eta =1/2)</span> was numerically calculated using the Newton–Raphson method. Subsequently, the image that was numerically reproduced from the spiral wave was compared with an experimentally visualized image. The torque acting on the inner sphere and the phase angular velocity of the spiral waves with various wavenumbers were provided. Attempts have been made to determine the instantaneous physical quantity that corresponds to the light and dark patterns observed in the flow visualization. From the attempts, we concluded the orientation motion of the flakes developed in the advective history of the flow is essential to yield these patterns. Exploring the correlation between flow visualization results and shear structures may provide a new avenue for quantitatively estimating spatial structures and time scales in complex and quickly time-varying flow fields, such as turbulence.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"235 12","pages":"7441 - 7452"},"PeriodicalIF":2.3,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142736825","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}

引用次数: 0

Local–nonlocal integral theories of elasticity with discontinuity for longitudinal vibration analysis of cracked rods 用于裂杆纵向振动分析的不连续弹性局部-非局部积分理论

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2024-09-30 DOI: 10.1007/s00707-024-04105-8

Pei Zhang, Peter Schiavone, Hai Qing

{"title":"Local–nonlocal integral theories of elasticity with discontinuity for longitudinal vibration analysis of cracked rods","authors":"Pei Zhang, Peter Schiavone, Hai Qing","doi":"10.1007/s00707-024-04105-8","DOIUrl":"10.1007/s00707-024-04105-8","url":null,"abstract":"<div><p>We present a size-dependent formulation for the longitudinal vibration study of cracked thick rods based on both the strain and stress-driven local/nonlocal mixture theories of elasticity with discontinuity. Due to the presence of the crack, the rod is divided into two segments connected by a linear spring, and compatibility conditions are given to describe the geometric discontinuity caused by the crack. The equations of motion of the discrete rods are formulated based on Rayleigh rod theory, and the two classes of local–nonlocal constitutive equations are integrated into an equivalent differential form, equipped with a set of constitutive boundary conditions at two ends of the whole structure and a set of constitutive continuity conditions at the junction of the sub-structures. The differential quadrature method (GDQM), together with the interpolation quadrature formula, is introduced to solve all the equations of motion of the sub-rods, the above constraint condition and the definite integrals occurring therein, simultaneously, through which we extract the dimensionless frequencies of the cracked rods with different boundary edges. After conducting comparison studies with the existing literature, numerical studies reveal that the present local–nonlocal model with discontinuity can effectively address the softening (or hardening) phenomenon as the structure’s size reduces. Moreover, the influence of crack location, crack severity, inertia of lateral motions and nonlocal parameters on the rods’ vibration frequencies is examined in detail.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"235 12","pages":"7419 - 7440"},"PeriodicalIF":2.3,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142736882","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}

引用次数: 0

Dispersion and bandgap feature of coupled Bloch waves in one-dimensional piezoelectric semiconductor phononic crystal with PN junction 带 PN 结的一维压电半导体声子晶体中耦合布洛赫波的色散和带隙特征

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2024-09-30 DOI: 10.1007/s00707-024-04094-8

Zibo Wei, Peijun Wei, Chunyu Xu, Xiao Guo

{"title":"Dispersion and bandgap feature of coupled Bloch waves in one-dimensional piezoelectric semiconductor phononic crystal with PN junction","authors":"Zibo Wei, Peijun Wei, Chunyu Xu, Xiao Guo","doi":"10.1007/s00707-024-04094-8","DOIUrl":"10.1007/s00707-024-04094-8","url":null,"abstract":"<div><p>The dispersion, attenuation and bandgap feature of coupled Bloch waves in one-dimensional piezoelectric semiconductor phononic crystal are studied in the present work. In particular, the influences of PN junction are emphasized. Different from the Bloch waves in the piezoelectric phononic crystal, the Bloch wave in piezoelectric semiconductor phononic crystal is attenuated. Moreover, the existence of the carrier fields brings forth more modes of Bloch waves due to the coupling of multiple physical fields. Using the state transfer equation method, the transfer matrix of the unit cell in a one-dimensional piezoelectric semiconductor phononic crystal is derived. Combining this with Bloch theory for periodic structures, the dispersion equation for multi-field coupled Bloch waves is obtained. The dispersion, attenuation and bandgap characteristics of the coupled Bloch waves are then plotted in the complex wave number domain. It is found that the influences of the PN junction are evident and thus provide an enlightenment that the propagation feature of Bloch waves can be adjusted by the control of the PN junction.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"235 12","pages":"7405 - 7417"},"PeriodicalIF":2.3,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142736883","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}

引用次数: 0

Lamb waves in sandwich plates: group velocity not equal to velocity of energy transport 夹层板中的 Lamb 波：群速度不等于能量传输速度

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2024-09-29 DOI: 10.1007/s00707-024-04099-3

Sergey V. Kuznetsov

引用次数: 0