Acta Mechanica Solida Sinica最新文献_第4页

Kinematic Shakedown Analysis for Strain-Hardening Plates with the C1 Nodal Natural Element Method 采用 C1 节点自然要素法对应变硬化板进行运动振动分析

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-05-28 DOI: 10.1007/s10338-024-00483-7

Shutao Zhou, Xiaohui Wang, Yatang Ju

{"title":"Kinematic Shakedown Analysis for Strain-Hardening Plates with the C1 Nodal Natural Element Method","authors":"Shutao Zhou, Xiaohui Wang, Yatang Ju","doi":"10.1007/s10338-024-00483-7","DOIUrl":"10.1007/s10338-024-00483-7","url":null,"abstract":"<div><p>This paper proposes a novel numerical solution approach for the kinematic shakedown analysis of strain-hardening thin plates using the C<sup>1</sup> nodal natural element method (C<sup>1</sup> nodal NEM). Based on Koiter’s theorem and the von Mises and two-surface yield criteria, a nonlinear mathematical programming formulation is constructed for the kinematic shakedown analysis of strain-hardening thin plates, and the C<sup>1</sup> nodal NEM is adopted for discretization. Additionally, König’s theory is used to deal with time integration by treating the generalized plastic strain increment at each load vertex. A direct iterative method is developed to linearize and solve this formulation by modifying the relevant objective function and equality constraints at each iteration. Kinematic shakedown load factors are directly calculated in a monotonically converging manner. Numerical examples validate the accuracy and convergence of the developed method and illustrate the influences of limited and unlimited strain-hardening models on the kinematic shakedown load factors of thin square and circular plates.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"37 5","pages":"786 - 797"},"PeriodicalIF":2.0,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141170375","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

Cushioning Performance of a Novel Polyurethane Foam Material Applied in Fragile Packaging 应用于易碎包装的新型聚氨酯泡沫材料的缓冲性能

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-05-22 DOI: 10.1007/s10338-024-00490-8

Huifeng Xi, Chunqiu Guo, Jinbiao Yang, Xiaogang Wang, Bowei Wang, Shiqing Huang, Zhiwei Wang

{"title":"Cushioning Performance of a Novel Polyurethane Foam Material Applied in Fragile Packaging","authors":"Huifeng Xi, Chunqiu Guo, Jinbiao Yang, Xiaogang Wang, Bowei Wang, Shiqing Huang, Zhiwei Wang","doi":"10.1007/s10338-024-00490-8","DOIUrl":"10.1007/s10338-024-00490-8","url":null,"abstract":"<div><p>For fragile products, packaging requires cushioning protection to prevent irreversible damage from accidental falls, transportation impacts, and other causes. The new polyurethane foam (PUF) material demonstrates superior cushioning and vibration isolation performance in practical applications, effectively minimizing damage from vibrations. Drop and vibration experiments were conducted on packages comprising novel PUF, expandable polyethylene, ethylene–vinyl acetate copolymer foam, and bracelets. Results verify that the new PUF material outperforms in cushioning and vibration isolation, as observed from the acceleration response. Furthermore, a random vibration analysis of a packaging unit involving different thicknesses of PUF materials and bracelets reveals the enhanced vibration isolation effect within a specific thickness range. The vibration results of the bracelet’s outer packaging align closely with finite element simulation results, validating the effectiveness of designing and optimizing the outer packaging. Through finite element simulation, deeper understanding and prediction of the bracelet’s vibration response under various conditions is achieved, facilitating optimized packaging design for better protection and vibration damping.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"37 3","pages":"487 - 497"},"PeriodicalIF":2.0,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141108087","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

Nonlinear Dynamics of an Axially Moving Plate Submerged in Fluid with Parametric and Forced Excitation 浸没在流体中的轴向运动板块的非线性动力学与参数和强制激励

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-05-16 DOI: 10.1007/s10338-024-00473-9

Hongying Li, Yijiao Xu, Wenqi Zhang, Jian Li

引用次数: 0

Feature Selection Using Tree Model and Classification Through Convolutional Neural Network for Structural Damage Detection 利用树状模型进行特征选择，并通过卷积神经网络进行分类，用于结构损伤检测

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-05-16 DOI: 10.1007/s10338-024-00491-7

Zihan Jin, Jiqiao Zhang, Qianpeng He, Silang Zhu, Tianlong Ouyang, Gongfa Chen

引用次数: 0

Semi-analytical Solutions for Wellbores with Graded Skin Zones in Poroelastic Media 具有梯度表皮区的柔性介质井筒的半分析解决方案

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-05-15 DOI: 10.1007/s10338-024-00487-3

Zhiqiang Fan, Zhihe Jin

引用次数: 0

Coupled Inversion of Pressure and Tiltmeter Data for Mapping Hydraulic Fracture Geometry 压力和倾斜仪数据的耦合反演，用于绘制水力压裂几何图形

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-05-07 DOI: 10.1007/s10338-024-00489-1

Zuorong Chen, Xiaofang Jiang, Zhejun Pan, Robert G. Jeffrey

{"title":"Coupled Inversion of Pressure and Tiltmeter Data for Mapping Hydraulic Fracture Geometry","authors":"Zuorong Chen, Xiaofang Jiang, Zhejun Pan, Robert G. Jeffrey","doi":"10.1007/s10338-024-00489-1","DOIUrl":"10.1007/s10338-024-00489-1","url":null,"abstract":"<div><p>Pressure and tilt data are jointly inverted to simultaneously map the orientation and dimensions of a hydraulic fracture. The deformation induced by a fracture under internal pressure is modeled using the distributed dislocation technique. The planar fracture is represented by four quarter ellipses, joined at the center and sharing semi-axes. This configuration provides a straightforward model for characterizing asymmetric fracture geometry. The inverse problem of mapping the fracture geometry is formulated using the Bayesian probabilistic method, combining the <i>a priori</i> information on the fracture model with updated information from pressure and tilt data. Solving the nonlinear inverse problem is achieved by pseudo-randomly sampling the posterior probability distribution through the Markov chain Monte Carlo method. The resulting posterior probability distribution is then explored to assess uncertainty, resolution, and correlation between model parameters. Numerical experiments are conducted to verify the accuracy and validity of the proposed analysis method in mapping the fracture geometry using synthetic pressure and tilt data.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"37 3","pages":"396 - 405"},"PeriodicalIF":2.0,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140886724","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

Analytical Expression for the Atomic Friction of a Single Asperity Based on the Prandtl–Tomlinson Model 基于普朗特-汤林森模型的单个微囊原子摩擦力分析表达式

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-05-02 DOI: 10.1007/s10338-024-00488-2

Weike Yuan, Yue Ding, Gangfeng Wang, Xinrui Niu

引用次数: 0

Dual-Porosity Apparent Permeability Models of Unconventional Gas Migration Based on Biot’s Porous Media 基于 Biot 多孔介质的非常规天然气迁移双孔隙表观渗透率模型

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-05-02 DOI: 10.1007/s10338-024-00486-4

Bin Gu, Hongyuan Liu, Yiuwing Mai, Bing Wang

{"title":"Dual-Porosity Apparent Permeability Models of Unconventional Gas Migration Based on Biot’s Porous Media","authors":"Bin Gu, Hongyuan Liu, Yiuwing Mai, Bing Wang","doi":"10.1007/s10338-024-00486-4","DOIUrl":"10.1007/s10338-024-00486-4","url":null,"abstract":"<div><p>Stress-dependent permeability models are developed for the organic pores and inorganic cleats/ fractures in unconventional gas reservoirs, which are modeled as Biot’s porous media of dual-porosity. Further considering multiple flow mechanisms such as dynamic effects of gas flow and surface diffusion, apparent permeability models are obtained to investigate the characteristics of unconventional gas migration. Compared to the gas transfer in single-porosity reservoirs, the gas migration ability of cleats in dual-porosity stratums rarely changes while that of organic pores is greatly improved because cleats sustain major geomechanical shrinkage deformation when the pore pressure drops. Further, the mass flux of reservoirs is dominated by the mass flux of cleats, which has a lower peak value, but a much longer production term than those in single-porosity reservoirs due to the interaction between organic pores and cleats. Parametric analysis is conducted to identify key factors significantly impacting mass flux in unconventional reservoirs. Reasons for the mass flux variation are also explored in terms of gas migration ability and pore pressure distribution.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"37 3","pages":"406 - 415"},"PeriodicalIF":2.0,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140886645","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

Strain Gradient Finite Element Formulation of Flexoelectricity in Ferroelectric Material Based on Phase-Field Method 基于相场法的铁电材料柔电应变梯度有限元模型

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-04-26 DOI: 10.1007/s10338-024-00485-5

Shuai Wang, Hengchang Su, Min Yi, Li-Hua Shao

{"title":"Strain Gradient Finite Element Formulation of Flexoelectricity in Ferroelectric Material Based on Phase-Field Method","authors":"Shuai Wang, Hengchang Su, Min Yi, Li-Hua Shao","doi":"10.1007/s10338-024-00485-5","DOIUrl":"10.1007/s10338-024-00485-5","url":null,"abstract":"<div><p>Flexoelectricity is a two-way coupling effect between the strain gradient and electric field that exists in all dielectrics, regardless of point group symmetry. However, the high-order derivatives of displacements involved in the strain gradient pose challenges in solving electromechanical coupling problems incorporating the flexoelectric effect. In this study, we formulate a phase-field model for ferroelectric materials considering the flexoelectric effect. A four-node quadrilateral element with 20 degrees of freedom is constructed without introducing high-order shape functions. The microstructure evolution of domains is described by an independent order parameter, namely the spontaneous polarization governed by the time-dependent Ginzburg–Landau theory. The model is developed based on a thermodynamic framework, in which a set of microforces is introduced to construct the constitutive relation and evolution equation. For the flexoelectric part of electric enthalpy, the strain gradient is determined by interpolating the mechanical strain at the node via the values of Gaussian integration points in the isoparametric space. The model is shown to be capable of reproducing the classic analytical solution of dielectric materials incorporating the flexoelectric contribution. The model is verified by duplicating some typical phenomena in flexoelectricity in cylindrical tubes and truncated pyramids. A comparison is made between the polarization distribution in dielectrics and ferroelectrics. The model can reproduce the solution to the boundary value problem of the cylindrical flexoelectric tube, and demonstrate domain twisting at domain walls in ferroelectrics considering the flexoelectric effect.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"37 4","pages":"570 - 579"},"PeriodicalIF":2.0,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803501","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

An Uncertainty Evaluation on the ΔKth and ΔKIC of Fine-grained Isotropic Graphite 各向同性细粒石墨 ΔKth 和 ΔKIC 的不确定性评估

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-04-18 DOI: 10.1007/s10338-024-00476-6

Yantian Zhang, Lina Zhu, Ruiguo Yan, Xishu Wang

{"title":"An Uncertainty Evaluation on the ΔKth and ΔKIC of Fine-grained Isotropic Graphite","authors":"Yantian Zhang, Lina Zhu, Ruiguo Yan, Xishu Wang","doi":"10.1007/s10338-024-00476-6","DOIUrl":"10.1007/s10338-024-00476-6","url":null,"abstract":"<div><p>This paper intensively explores the critical issues related to the quantitative and accurate evaluations of FCG behavior in the early stage, macro fatigue fracture toughness, and the critical crack size for damage tolerance in nuclear graphite. To address these issues, scale-span FCG tests were carried out using two typical specimens, CT and SEM <i>in-situ</i> specimens. These results indicate that the FCG threshold and the effective FCG length have a significant correlation with the modified maximum loop stress theory for a mixed I/II mode. In particular, the effective FCG length (<i>a</i><sub>eq</sub>) and the applied stress threshold of polycrystalline graphite are important parameters for fatigue damage tolerance design in engineering application. The influencing factors of Δ<i>K</i><sub>th,eq</sub> and <i>a</i><sub>eq</sub> were discussed in detail using the mixed I/II mode, respectively. In addition, the scattered values of Δ<i>K</i><sub>IC</sub> for this graphite can be quantitatively estimated using the Weibull distribution equation. The predicated parameters and experimental results demonstrate a strong correlation.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"37 3","pages":"478 - 486"},"PeriodicalIF":2.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140629194","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