Acta Mechanica Solida Sinica最新文献_第7页

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

Different Types of Bone Fractures Observed by Terahertz Time-Domain Spectroscopy 太赫兹时域光谱学观察到的不同类型骨折

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-04-15 DOI: 10.1007/s10338-024-00482-8

Minghao Zhang, Xianjia Meng, Zhiyong Wang, Chuanyong Qu, Chuan Qu, Donghui Fu

{"title":"Different Types of Bone Fractures Observed by Terahertz Time-Domain Spectroscopy","authors":"Minghao Zhang, Xianjia Meng, Zhiyong Wang, Chuanyong Qu, Chuan Qu, Donghui Fu","doi":"10.1007/s10338-024-00482-8","DOIUrl":"10.1007/s10338-024-00482-8","url":null,"abstract":"<div><p>Microcracks are common in compact bone, but their continued propagation can lead to macroscopic fractures. These microcracks cannot be visualized radiographically, necessitating alternative noninvasive methods to identify excessive microcracking and prevent fractures. In this study, terahertz time-domain spectroscopy (THz-TDS) was used to examine bone interiors near cracks resulting from loading in bovine tibia samples. Various loading configurations, such as impact, quasi-static loading, and fatigue loading, known to induce different types of micro-scale damage, were applied. The values of refractive index and absorption coefficient of the bone samples were then determined from the THz-TDS spectra acquired before loading and after fracture. The study revealed that different loading configurations led to varying terahertz optical coefficients associated with various types of bone fractures. Specifically, the refractive index notably increased under fatigue loading but remained relatively stable during quasi-static bending. The absorption coefficient of bone decreased only under fatigue loading. Furthermore, samples were subjected to axial and radial impacts without sustaining damage. Results indicated that in the undamaged state, the change in refractive index was smaller compared to after impact failure, while the change in absorption coefficient remained consistent after failure. Under radial impact loading, changes in refractive index and absorption coefficient were significantly more pronounced than under axial loading. Prior to loading, the measured value of refractive index was 2.72 ± 0.11, and the absorption coefficient was 6.33 ± 0.09 mm<sup>−1</sup> at 0.5 THz.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"37 3","pages":"468 - 477"},"PeriodicalIF":2.0,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140574014","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

Peeling of Magneto-responsive Beams with Large Deformation Mediated by the Parallel Magnetic Field 平行磁场介导大变形磁响应梁的剥离现象

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-04-15 DOI: 10.1007/s10338-024-00480-w

Gongqi Cao, Zhangna Xue, Shiyang Liu, Yuchen Jin, Jianlin Liu

引用次数: 0

Investigation on the Velocity-Dependent Adhesion Hysteresis via Molecular Dynamics Simulation 通过分子动力学模拟研究与速度相关的粘滞现象

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-04-15 DOI: 10.1007/s10338-024-00484-6

Jinshan He, Yiran Li, Zhaoyang Ma, Ganyun Huang

引用次数: 0

Analytical Solution for the Reissner–Sagoci Problem of a Piezoelectric Half-Space 压电半空间 Reissner-Sagoci 问题的解析解

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-04-12 DOI: 10.1007/s10338-024-00481-9

Keqiang Hu, Cun-Fa Gao, Zengtao Chen, Zheng Zhong

引用次数: 0

Analytical Solutions for an Isotropic Elastic Half-Plane with Complete Surface Effects Subjected to a Concentrated/Uniform Surface Load 具有完全表面效应的各向同性弹性半平面在集中/均匀表面载荷作用下的分析解决方案

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-04-10 DOI: 10.1007/s10338-024-00478-4

Xia-Hui Pan

{"title":"Analytical Solutions for an Isotropic Elastic Half-Plane with Complete Surface Effects Subjected to a Concentrated/Uniform Surface Load","authors":"Xia-Hui Pan","doi":"10.1007/s10338-024-00478-4","DOIUrl":"10.1007/s10338-024-00478-4","url":null,"abstract":"<div><p>Within the context of Gurtin–Murdoch surface elasticity theory, closed-form analytical solutions are derived for an isotropic elastic half-plane subjected to a concentrated/uniform surface load. Both the effects of residual surface stress and surface elasticity are included. Airy stress function method and Fourier integral transform technique are used. The solutions are provided in a compact manner that can easily reduce to special situations that take into account either one surface effect or none at all. Numerical results indicate that surface effects generally lower the stress levels and smooth the deformation profiles in the half-plane. Surface elasticity plays a dominant role in the in-plane elastic fields for a tangentially loaded half-plane, while the effect of residual surface stress is fundamentally crucial for the out-of-plane stress and displacement when the half-plane is normally loaded. In the remaining situations, combined effects of surface elasticity and residual surface stress should be considered. The results for a concentrated surface force serve essentially as fundamental solutions of the Flamant and the half-plane Cerruti problems with surface effects. The solutions presented in this work may be helpful for understanding the contact behaviors between solids at the nanoscale.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"37 3","pages":"371 - 384"},"PeriodicalIF":2.0,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140590764","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

Isogeometric Analysis (IGA)-Based Topology Optimization for 3D Flexoelectric Structures 基于等几何分析 (IGA) 的三维柔电结构拓扑优化

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-04-08 DOI: 10.1007/s10338-024-00479-3

Yao Meng, Xiaoye Yan, Weisheng Zhang

引用次数: 0

Bending Analysis of Circular Piezoelectric Semiconductor Plates Incorporating Flexoelectricity 包含柔电的圆形压电半导体板的弯曲分析

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-04-08 DOI: 10.1007/s10338-024-00466-8

Liang Sun, Zhengguang Xiao, Chunli Zhang, Weiqiu Chen

引用次数: 0