Applied Mechanics Reviews最新文献_第8页

On the Countering of Free Vibrations by Forcing: Part I—Non-Resonant and Resonant Forcing with Phase Shifts 用强迫对抗自由振动:第一部分-非共振和带相移的共振强迫

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-12-03 DOI: 10.3390/applmech3040078

L. Campos, Manuel J. S. Silva

{"title":"On the Countering of Free Vibrations by Forcing: Part I—Non-Resonant and Resonant Forcing with Phase Shifts","authors":"L. Campos, Manuel J. S. Silva","doi":"10.3390/applmech3040078","DOIUrl":"https://doi.org/10.3390/applmech3040078","url":null,"abstract":"The question addressed is whether the free oscillations of a continuous system can be suppressed, or at least the total energy reduced, by applying external forces, using as example the linear undamped transverse oscillations of a uniform elastic string. The non-resonant forcing at an applied frequency, distinct from all natural frequencies, does not interact with the normal modes, whose energy is unchanged, and adds the energy of the forced oscillation, thus increasing the total energy, that is the opposite of the result being sought. The resonant forcing at an applied frequency, equal to one of the natural frequencies, leads to an amplitude growing linearly with time, and hence the energy is growing quadratically with time, implying an increase in total energy after a sufficiently long time. A reduction in total energy is possible over a short time, say over the first period of oscillation, by optimizing the forcing. In the case of a concentrated force, by optimizing its magnitude and location, the total energy with forcing in one period is reduced by a modest maximum of 2% relative to the free oscillation alone. The conclusion is similar for several concentrated forces. In the case of a continuously distributed force, by optimizing the spatial distribution, it is possible to reduce the energy of the total oscillation to one-fourth of that of the free oscillation over the first period of vibration. This shows that continuously distributed forces are more effective at vibration suppression than point forces.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"11 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74308145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Explicit Analytic Solutions for the Subsurface Stress Field in Single Plane Contacts of Elastically Similar Truncated Cylinders or Wedges 弹性相似截形圆柱或楔形单平面接触下应力场的显式解析解

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-11-29 DOI: 10.3390/applmech3040077

E. Willert

{"title":"Explicit Analytic Solutions for the Subsurface Stress Field in Single Plane Contacts of Elastically Similar Truncated Cylinders or Wedges","authors":"E. Willert","doi":"10.3390/applmech3040077","DOIUrl":"https://doi.org/10.3390/applmech3040077","url":null,"abstract":"As has been pointed out recently, a possible solution strategy to the wear–fatigue dilemma in fretting, operating on the level of contact mechanics and profile geometries, can be the introduction of “soft” sharp edges to the contact profiles, for example, by truncating an originally smooth profile. In that regard, analysis of possible mechanical failure of a structure, due to the contact interaction, requires the knowledge of the full subsurface stress state resulting from the contact loading. In the present manuscript, a closed-form exact solution for the subsurface stress state is given for the frictional contact of elastically similar truncated cylinders or wedges, within the framework of the half-plane approximation and a local-global Amontons–Coulomb friction law. Moreover, a fast and robust semi-analytical method, based on the appropriate superposition of solutions for parabolic contact, is proposed for the determination of the subsurface stress fields in frictional plane contacts with more complex profile geometries, and compared with the exact solution. Based on the analytical solution, periodic tangential loading of a truncated cylinder is considered in detail, and important scalar characteristics of the stress state, like the von-Mises equivalent stress, maximum shear stress, and the largest principal stress, are determined. Positive (i.e., tensile) principal stresses only exist in the vicinity of the contact edge, away from the pressure singularity at the edge of the profile, and away from the maxima of the von-Mises equivalent stress, or the maximum shear stress. Therefore, the fretting contact should not be prone to fatigue crack initiation.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"75 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90059568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 1

An Innovative Approach to Improving Residual Stress Distribution and Metallurgical Refinement of Forged AA7175 Applied in the Aeronautical Industry 航空用AA7175锻件残余应力分布及冶金细化的创新方法

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-11-28 DOI: 10.3390/applmech3040076

Kadiata Ba, Sasan Sattarpanah Karganroudi, A. Aminzadeh, M. Javidani, M. S. Meiabadi

引用次数: 0

Models for the Interplay of Mechanics, Electrochemistry, Thermodynamics and Kinetics in Lithium-Ion Batteries 锂离子电池力学、电化学、热力学和动力学相互作用的模型

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-11-22 DOI: 10.1115/1.4056289

V. Deshpande, R. McMeeking

{"title":"Models for the Interplay of Mechanics, Electrochemistry, Thermodynamics and Kinetics in Lithium-Ion Batteries","authors":"V. Deshpande, R. McMeeking","doi":"10.1115/1.4056289","DOIUrl":"https://doi.org/10.1115/1.4056289","url":null,"abstract":"\u0000 The interplay of mechanics, electrochemistry, thermodynamics and kinetics in lithium-ion batteries is summarized. Attention is focused on models for such interactions but is restricted to issues related to all solid-state batteries with lithium metal anodes and a solid electrolyte, as such systems potentially enable higher energy density. Models for diffusion induced stress and fracture due to lithiation swelling and shrinkage are overviewed. Transport models for lithium ions in solid electrolytes are summarized. Mechanical effects are significant in binary ion conducting materials. The effect of stress on the kinetics of lithium flux across electrode-electrolyte interfaces is described. Such constitutive laws are relevant to modeling the morphological stability or instability of the electrode-electrolyte interface. The preceding topics are relatively well developed in regard to modeling. The models that have been developed are fairly successful in terms of agreement with experimental observations, though further work is needed in all areas to explore phenomena that become prominent as technology and materials development advances. An area that is less mature is modeling of the nucleation and growth of lithium filaments in solid electrolytes that lead to cell short circuits. The models that have been developed for this phenomenon are described. They are not fully consistent with the observed behavior of lithium filament and dendrite growth in solid electrolytes. Thus, filament growth and void growth in the lithium metal electrode that is closely connected with filament growth remain open issues that need further model development at a fundamental level.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"249 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77265046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 4

A Survey on Non-Destructive Smart Inspection of Wind Turbine Blades Based on Industry 4.0 Strategy 基于工业4.0战略的风电叶片无损智能检测研究

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-11-16 DOI: 10.3390/applmech3040075

M. Dimitrova, A. Aminzadeh, M. S. Meiabadi, Sasan Sattarpanah Karganroudi, H. Taheri, Hussein Ibrahim

{"title":"A Survey on Non-Destructive Smart Inspection of Wind Turbine Blades Based on Industry 4.0 Strategy","authors":"M. Dimitrova, A. Aminzadeh, M. S. Meiabadi, Sasan Sattarpanah Karganroudi, H. Taheri, Hussein Ibrahim","doi":"10.3390/applmech3040075","DOIUrl":"https://doi.org/10.3390/applmech3040075","url":null,"abstract":"Wind turbines are known to be the most efficient method of green energy production, and wind turbine blades (WTBs) are known as a key component of the wind turbine system, with a major influence on the efficiency of the entire system. Wind turbine blades have a quite manual production process of composite materials, which induces various types of defects in the blade. Blades are susceptible to the damage developed by complex and irregular loading or even catastrophic collapse and are expensive to maintain. Failure or damage to wind turbine blades not only decreases the lifespan, efficiency, and fault diagnosis capability but also increases safety hazards and maintenance costs. Hence, non-destructive testing (NDT) methods providing surface and subsurface information for the blade are indispensable in the maintenance of wind turbines. Damage detection is a critical part of the inspection methods for failure prevention, maintenance planning, and the sustainability of wind turbine operation. Industry 4.0 technologies provide a framework for deploying smart inspection, one of the key requirements for sustainable wind energy production. The wind energy industry is about to undergo a significant revolution due to the integration of the physical and virtual worlds driven by Industry 4.0. This paper aims to highlight the potential of Industry 4.0 to help exploit smart inspections for sustainable wind energy production. This study is also elaborated by damage categorization and a thorough review of the state-of-the-art non-destructive techniques for surface and sub-surface inspection of wind turbine blades.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"83 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88522820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 6

Review of the Basic Elastic Mechanical Properties and Their Realignment to Establish Ductile Versus Brittle Failure Behaviors 回顾基本弹性力学性能及其重新定位以建立韧性与脆性破坏行为

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-11-09 DOI: 10.1115/1.4056203

R. M. Christensen

引用次数: 1

Thermomechanical Constitutive Models of Shape Memory Polymers and Their Composites 形状记忆聚合物及其复合材料的热力学本构模型

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-11-08 DOI: 10.1115/1.4056131

Wei Zhao, Liwu Liu, X. Lan, J. Leng, Yanju Liu

引用次数: 5

What Is the Internal Pressure That Initiates Damage in Cementitious Materials during Freezing and Thawing? A Micromechanical Analysis 在冻融过程中引起胶凝材料损伤的内部压力是什么?微观力学分析

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-11-05 DOI: 10.3390/applmech3040074

J. Timothy, Alexander Haynack, T. Kränkel, C. Gehlen

{"title":"What Is the Internal Pressure That Initiates Damage in Cementitious Materials during Freezing and Thawing? A Micromechanical Analysis","authors":"J. Timothy, Alexander Haynack, T. Kränkel, C. Gehlen","doi":"10.3390/applmech3040074","DOIUrl":"https://doi.org/10.3390/applmech3040074","url":null,"abstract":"Damage induced by repetitive freezing and thawing processes is one of the critical factors that affect concrete durability in cold climates. This deterioration process manifests as surface scaling and internal damage. The damage processes are governed by physicochemical mechanisms that are active across multiple scales. In this contribution, we present a novel multiscale theoretical framework for estimating the critical pressure required for microcrack initiation during freezing and thawing of cementitious mortar. Continuum micromechanics and fracture mechanics is used to model the phenomena of microcrack initiation and growth. Damage at the microscale is upscaled to the level of the specimen using multilevel homogenization. The critical pressure is estimated using poromechanics at the microscopic scale. A theoretical analysis shows that in the frozen state, the material can resist higher pressures. As a consequence, the material is more susceptible to damage during thawing. The micromechanical predictions are within the range of the predictions obtained by electrokinetic theory.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"119 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80385100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 2

Local Stability in the Process of Excavation Located in High Permeability Saturated Sand of Diaphragm Wall Construction 高渗透饱和砂土连续墙开挖过程中的局部稳定性研究

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-10-31 DOI: 10.3390/applmech3040072

Yuhang Liu, Linchun Wei, Yanfei Zhu, X. Zhuang

{"title":"Local Stability in the Process of Excavation Located in High Permeability Saturated Sand of Diaphragm Wall Construction","authors":"Yuhang Liu, Linchun Wei, Yanfei Zhu, X. Zhuang","doi":"10.3390/applmech3040072","DOIUrl":"https://doi.org/10.3390/applmech3040072","url":null,"abstract":"The stability of the slurry trench is very important in the construction of the underground diaphragm wall. In the current research, the local instability of the slurry trench is mainly investigated after the excavation of a unit slot is completely completed. However, the local stability in the process of excavation has received little attention. In this paper, the local stability in the process of excavation located in high permeability strata of diaphragm wall construction is investigated. A slurry infiltration experiment was carried out to investigate the distribution of the excess pore pressure in the high permeability strata, which can determine the effective support pressure. Then, the local stability of the slurry trench in the process of excavation located in high permeability saturated sand is calculated. The results show that the same types of sand according to the design code cannot be simply treated to have the same permeability and similar distribution of the excess pore pressure, since whether the filter cake can be formed and the quality of the filter cake are the key factors to determine the distribution of the excess pore pressure. This is also crucial for the local stability in the process of excavation located in high permeability saturated sand. It is suggested that attention should be paid to the local stability in the process of excavation located in high permeability strata when the slurry infiltration mode is the pure permeable zone.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"140 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77597107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Stiction and Friction of Nano- and Microtextured Liquid Silicon Rubber Surface Formed by Injection Molding 注射成型液态硅橡胶纳米和微织构表面的粘滞和摩擦

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-10-31 DOI: 10.3390/applmech3040073

C. Koplin, Dennis F. Weißer, A. Fromm, M. Deckert

{"title":"Stiction and Friction of Nano- and Microtextured Liquid Silicon Rubber Surface Formed by Injection Molding","authors":"C. Koplin, Dennis F. Weißer, A. Fromm, M. Deckert","doi":"10.3390/applmech3040073","DOIUrl":"https://doi.org/10.3390/applmech3040073","url":null,"abstract":"The use of cross-linking polymers such as liquid silicone rubber (LSR) can replicate serviceable surfaces with nano- and microstructures via the injection molding process. Laser ablation can be used to introduce microstructures into molding tools, while nanostructures are generated via PVD coating processes on the tools. This is why nanostructures are built using self-organized layer growth. The aim of this study was to generate evidence of direction-dependent coefficients of friction of elastomeric surfaces in dry or lubricated contact in boundary friction. Models of the dry friction of elastomeric surfaces, such as Schallamach waves or stick-slip cycles, were used to describe the friction modulation of such surfaces. Assumptions for model contacts against smooth partners, both dry and with lubrication, as well as assumptions for the interaction of structures with smooth surfaces, were investigated. It was found that for elastomer surfaces with Shore hardness 50, nanostructures are suitable for creating a direction-dependent friction increase in static and sliding friction. Friction reductions with defined microstructures are possible if their periodicity seems to interact with the wavelength of possible Schallamach waves. The choice of lubrication determines the forced wetting of the contact, but due to the structuring, there is a continuous transition to mixed friction.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"62 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80493411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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