Extreme Mechanics Letters最新文献_第8页

A switchable flexible mechanical clutch based on self-amplified friction of interleaved layers 基于交错层自放大摩擦的可切换柔性机械离合器

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-07-02 DOI: 10.1016/j.eml.2024.102197

Aoyi Luo , A. John Hart

引用次数: 0

Symmetry-enforcing neural networks with applications to constitutive modeling 对称强化神经网络在构造建模中的应用

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-07-01 DOI: 10.1016/j.eml.2024.102188

Kévin Garanger , Julie Kraus , Julian J. Rimoli

{"title":"Symmetry-enforcing neural networks with applications to constitutive modeling","authors":"Kévin Garanger , Julie Kraus , Julian J. Rimoli","doi":"10.1016/j.eml.2024.102188","DOIUrl":"10.1016/j.eml.2024.102188","url":null,"abstract":"<div><p>The use of machine learning techniques to homogenize the effective behavior of arbitrary microstructures has been shown to be not only efficient but also accurate. In a recent work, we demonstrated how to combine state-of-the-art micromechanical modeling and advanced machine learning techniques to homogenize complex microstructures exhibiting non-linear and history dependent behaviors (Logarzo et al., 2021). The resulting homogenized model, termed smart constitutive law (SCL), enables the adoption of microstructurally informed constitutive laws into finite element solvers at a fraction of the computational cost required by traditional concurrent multiscale approaches. In this work, the capabilities of SCLs are expanded via the introduction of a novel methodology that enforces material symmetries at the neuron level, applicable across various neural network architectures. This approach utilizes tensor-based features in neural networks, facilitating the concise and accurate representation of symmetry-preserving operations, and is general enough to be extend to problems beyond constitutive modeling. Details on the construction of these tensor-based neural networks and their application in learning constitutive laws are presented for both elastic and inelastic materials. The superiority of this approach over traditional neural networks is demonstrated in scenarios with limited data and strong symmetries, through comprehensive testing on various materials, including isotropic neo-Hookean materials and tensegrity lattice metamaterials. This work is concluded by a discussion on the potential of this methodology to discover symmetry bases in materials and by an outline of future research directions.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"71 ","pages":"Article 102188"},"PeriodicalIF":4.3,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352431624000683/pdfft?md5=a6079be019d91d1f3f45b2fa94affc7c&pid=1-s2.0-S2352431624000683-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141638032","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}

引用次数: 0

High-order second-generation wavelet upwind schemes with multiresolution self-adaptive capabilities for hyperbolic conservation laws 针对双曲守恒定律的具有多分辨率自适应能力的高阶第二代小波上风方案

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-06-29 DOI: 10.1016/j.eml.2024.102192

Bing Yang , Youhe Zhou , Jizeng Wang

{"title":"High-order second-generation wavelet upwind schemes with multiresolution self-adaptive capabilities for hyperbolic conservation laws","authors":"Bing Yang , Youhe Zhou , Jizeng Wang","doi":"10.1016/j.eml.2024.102192","DOIUrl":"https://doi.org/10.1016/j.eml.2024.102192","url":null,"abstract":"<div><p>We introduce a novel system of high-order wavelet collocation upwind schemes utilizing a broad class of second-generation wavelets for hyperbolic conservation laws. These schemes possess multiresolution self-adaptive capabilities and are integrated into a meshfree framework. Unlike traditional high-order schemes that necessitate frequent variable transformations between physical and characteristic spaces involving numerous local projections, our schemes enable the direct discretization of relevant spatial derivatives in the physical space. The newly proposed schemes make the most use of wavelet properties, i.e., applying asymmetrical interpolating wavelets to achieve the upwind property and utilizing the symmetrical second-generation wavelets to preserve shapes of functions and obtain higher data compression rates. Numerical tests of which solutions contain strong discontinuities and different scale smooth structures are conducted to demonstrate the enhanced performance of the proposed schemes based on the second-generation wavelets. The proposed schemes can utilize only 9 % of the nodes in the WENO5 scheme to yield similar results when addressing the advection of a square wave and achieve the convergent solution for the two interacting blast waves problem without local characteristics projection. In comparison to conventional methods and wavelet upwind schemes based on the interpolating wavelets we previously introduced, the newly proposed schemes exhibit a significantly higher data compression rate and yield substantial computational savings without compromising accuracy.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"70 ","pages":"Article 102192"},"PeriodicalIF":4.3,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141543791","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

Shear localization in gradient high-entropy alloy at high strain rates: Crystal plasticity modeling 梯度高熵合金在高应变速率下的剪切定位：晶体塑性模型

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-06-29 DOI: 10.1016/j.eml.2024.102194

Chuan-zhi Liu , Qi-lin Xiong , Wen An

{"title":"Shear localization in gradient high-entropy alloy at high strain rates: Crystal plasticity modeling","authors":"Chuan-zhi Liu , Qi-lin Xiong , Wen An","doi":"10.1016/j.eml.2024.102194","DOIUrl":"https://doi.org/10.1016/j.eml.2024.102194","url":null,"abstract":"<div><p>Gradient-structured metals have attracted a lot of attention due to their good synergy between strength and ductility. However, whether they can be used as a candidate for effective prevention of shear localization failure during high strain rate deformations is still an open question. Corresponding to the particular mechanisms of dynamic recrystallization and twinning at high strain rates, a physically based constitutive model of crystal plasticity is developed, including a new evolution equation for dislocation density and a twinning model, to investigate the detailed process of shear localization of gradient-structured CoCrFeMnNi high-entropy alloys (HEAs). A physically based strain gradient theory is considered to capture the strengthening effect of gradient structures. The competition between microstructural softening and strengthening effects is quantified to reveal the effects of gradient-structure on shear localization and shear localization can be significantly delayed in gradient-structured HEAs. This study contributes to the understanding of the influence of gradient-structure on shear localization and provides insights for further optimization of the mechanical behavior of gradient-structures at high strain rates to develop strong and ductile metals and alloys for dynamic applications.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"70 ","pages":"Article 102194"},"PeriodicalIF":4.3,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141594424","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

Machine learning based prediction models for uniaxial ratchetting of extruded AZ31 magnesium alloy 基于机器学习的挤压 AZ31 镁合金单轴棘轮变形预测模型

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-06-29 DOI: 10.1016/j.eml.2024.102193

Xiaowen Deng, Yanan Hu, Binghui Hu, Ziyi Wang, Guozheng Kang

{"title":"Machine learning based prediction models for uniaxial ratchetting of extruded AZ31 magnesium alloy","authors":"Xiaowen Deng, Yanan Hu, Binghui Hu, Ziyi Wang, Guozheng Kang","doi":"10.1016/j.eml.2024.102193","DOIUrl":"https://doi.org/10.1016/j.eml.2024.102193","url":null,"abstract":"<div><p>The detrimental effect of ratchetting on the fatigue life of materials requires precise prediction models to guarantee the safety of engineering structures. This study focuses on predicting the uniaxial ratchetting of extruded AZ31 magnesium (Mg) alloy using machine learning (ML) based approaches. At first, the evolution and deformation mechanisms of ratchetting are summarized based on the existing experimental results of the Mg alloy. Subsequently, a semi-empirical prediction model, tailored for engineering applications, is developed to describe the evolution of ratchetting strain. Then, a pure data-driven ML based prediction model is proposed to overcome the shortcoming existed in the semi-empirical model and improve the prediction accuracy to the uniaxial ratchetting of the Mg alloy. Finally, a physics-informed ML based model, incorporating the physical information derived from the semi-empirical one, is proposed to further enhance its prediction accuracy and generalization ability. The comparison with correspondent experimental data demonstrates that the proposed physics-informed ML based model exhibits high prediction accuracy and generalization ability.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"70 ","pages":"Article 102193"},"PeriodicalIF":4.3,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141543790","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

Current density alters the mechanical stresses during electrodeposition of lithium metal anodes 电流密度改变锂金属阳极电沉积过程中的机械应力

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-06-27 DOI: 10.1016/j.eml.2024.102186

Jungho Shin, Matt Pharr

{"title":"Current density alters the mechanical stresses during electrodeposition of lithium metal anodes","authors":"Jungho Shin, Matt Pharr","doi":"10.1016/j.eml.2024.102186","DOIUrl":"https://doi.org/10.1016/j.eml.2024.102186","url":null,"abstract":"<div><p>“Lithium metal” batteries operate via electroplating/stripping of Li metal and promise vast theoretical capacities. However, significant technical barriers must be addressed prior to commercialization. The primary challenges include the generation of mechanical stresses and strains due to \"infinite volume expansion,” as well as non-uniform deposition of lithium metal, which often leads to dendrite formation and growth. Lithium dendrite formation is particularly critical, as dendrites can penetrate solid-state electrolytes, eventually shorting to the cathode, thereby diminishing the capacity of the battery and inducing severe safety hazards. These primary issues are intrinsically linked to the mechanical behavior of lithium; as such, this study focuses on the mechanical response of lithium electrodeposition under various electrochemical conditions. Experimental tests herein reveal that larger applied current densities induce significantly larger mechanical stresses during electroplating of Li metal. This manuscript concludes by detailing practical implications of these experimental observations, particularly regarding dendrite growth through solid-state electrolytes of solid-state batteries.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"70 ","pages":"Article 102186"},"PeriodicalIF":4.3,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141481625","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

Strength prediction and design of defective graphene based on machine learning approach 基于机器学习方法的缺陷石墨烯强度预测与设计

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-06-25 DOI: 10.1016/j.eml.2024.102191

Shu Lin , Guoqiang Zhang , Kaiwen Li , Kai Pang , Yushu Li , Jing Wan , Huasong Qin , Yilun Liu

{"title":"Strength prediction and design of defective graphene based on machine learning approach","authors":"Shu Lin , Guoqiang Zhang , Kaiwen Li , Kai Pang , Yushu Li , Jing Wan , Huasong Qin , Yilun Liu","doi":"10.1016/j.eml.2024.102191","DOIUrl":"https://doi.org/10.1016/j.eml.2024.102191","url":null,"abstract":"<div><p>Defects are inevitable in two-dimensional (2D) materials. Thus, the strength prediction and design are crucial for practical application of defective 2D materials. Utilizing a dataset from molecular dynamic (MD) simulations, this study aims to predict, as well as design the strength of defective graphene. Through convolutional neural networks (CNN), the constructed residual network ResNet34 can accurately predict the fracture strength directly from the defect configuration of graphene. Meanwhile, ablation class activation map (Ablation-CAM) further identifies the sensitive domains that dominate the fracture strength, in accordance with the crack initiation regions confirmed by MD simulations and experiments. In particular, a new descriptor named sensitive domain factor (<em>SDF</em>) was developed to characterize the important features of sensitive domains. Furthermore, a genetic algorithm (GA) is then applied to strategically optimize the defect configuration under a given defect density, achieving an ideal configuration with the maximum fracture strength. This work pioneers a machine learning framework for the extraction and optimization of defective features in monolayer graphene, offering a novel approach to design the mechanical properties through defect engineering.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"70 ","pages":"Article 102191"},"PeriodicalIF":4.3,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141481623","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

Radial artery pulse wave age-related assessment for diabetic patients based on multiple linear regression time domain analysis method 基于多元线性回归时域分析方法的糖尿病患者桡动脉脉搏波年龄相关性评估

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-06-24 DOI: 10.1016/j.eml.2024.102185

Bensen Li , Yicheng Lu , Xuehang Sun , Xiabo Chen , Wenbo Gong , Fuxing Miao

{"title":"Radial artery pulse wave age-related assessment for diabetic patients based on multiple linear regression time domain analysis method","authors":"Bensen Li , Yicheng Lu , Xuehang Sun , Xiabo Chen , Wenbo Gong , Fuxing Miao","doi":"10.1016/j.eml.2024.102185","DOIUrl":"https://doi.org/10.1016/j.eml.2024.102185","url":null,"abstract":"<div><p>The global incidence of diabetes increases yearly. About 10 % of adults are affected. This study established a multiple linear regression (MLR) time domain analysis model of radial artery pulse wave characteristic parameters in CUN, GUAN and CHI based on traditional Chinese medicine (TCM) to assess diabetes. Pulse signals of diabetic subjects were collected by a pulse instrument. The locations of CUN, GUAN and CHI were determined by a TCM practitioner, and all pulse signals were normalized. Measurement data from 100 male and 100 female patients were used to establish a new time domain analysis method for extracting pulse wave characteristic parameters called equal pressure pulse transit time (EP-PTT). For these mentioned samples, the EP-PTT is different for male and female diabetic subjects, it was smaller for male diabetic subjects than those of female diabetic subjects. EP-PTT<sub>1</sub> and EP-PTT<sub>6</sub> are relevant to predicting age based on CUN, GUAN and CHI signals, which showed a linear negative correlation (<em>P</em> < 0.05). The EP-PTT<sub><em>i</em></sub> (<em>i</em> = 2, 3, 4) of female diabetic subjects are linearly correlated with age, and all of these are positively correlated (<em>P</em> < 0.05). These observations were clearly different from observations in healthy controls. The pulse waveform of CUN, GUAN and CHI of diabetic subjects can explore the relationship between the age of diabetic subjects and EP-PTT. The preliminary findings will provide foundational data for type 2 diabetes assessment based on CUN, GUAN and CHI pulse signals of radial artery, and the proposed new analysis method can be used for assessing type 2 diabetes.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"70 ","pages":"Article 102185"},"PeriodicalIF":4.3,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141481624","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

Partial stretch behavior analysis of single crease origami unit 单折痕折纸单元的局部拉伸行为分析

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-06-19 DOI: 10.1016/j.eml.2024.102184

Qian Zhang, Marco Meloni, Jian Feng, Jianguo Cai

{"title":"Partial stretch behavior analysis of single crease origami unit","authors":"Qian Zhang, Marco Meloni, Jian Feng, Jianguo Cai","doi":"10.1016/j.eml.2024.102184","DOIUrl":"https://doi.org/10.1016/j.eml.2024.102184","url":null,"abstract":"<div><p>The deformation of single crease origami units under partial stretch loads along the crease extension direction is influenced by their plates’ bending stiffness. For their application, it is of great significance to analyze the non-uniform deformation pattern of origami units and clarify the efficiency of partial driving on global unfolding. In this paper, the unfolding behavior of single crease origami units under partial stretch is systematically investigated. From the bending phenomenon of paper models, a parametrical simulation analysis is performed to analyze deformation patterns and virtual crease distribution. Furthermore, the overall uniform motion efficiency of origami units with local driving is discussed, while the criterion of uniform unfolding motion of the crease is defined. The feasible ranges of partial load factors corresponding to single crease origami units with different initial crease angles are also clarified under the constraint of the required uniform motion range. Mechanical and kinematic models are also established based on equivalent rigid plate nonlinear crease elements and equivalent single-vertex six-crease patterns, which can accurately identify the deformation characteristics of the single-crease origami unit under partial stretch. Furthermore, the flattening analysis of derived single-vertex six-crease origami units and their arrays is also carried out to investigate the influence of sector angles and crease rotation stiffness. Two different decay characteristics are observed, corresponding to the fully flattened planar state and the non-fully flattened planar state, respectively. A motion snap that occurs before the fully flattened planar state is also identified. The findings can be regarded as the research basis for the complex mechanical behavior of origami structures composed of single crease origami units.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"70 ","pages":"Article 102184"},"PeriodicalIF":4.3,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141434703","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

Experimental and numerical investigation of the photo-mechanical response of azobenzene filled soft elastomers, Part I: Experimental investigations 偶氮苯填充软弹性体光机械响应的实验和数值研究，第 I 部分：实验研究

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-06-18 DOI: 10.1016/j.eml.2024.102182

Markus Mehnert , Miguel Angel Moreno-Mateos , Jan H. Griwatz , Silke Müsse , Hermann Wegner , Paul Steinmann

{"title":"Experimental and numerical investigation of the photo-mechanical response of azobenzene filled soft elastomers, Part I: Experimental investigations","authors":"Markus Mehnert , Miguel Angel Moreno-Mateos , Jan H. Griwatz , Silke Müsse , Hermann Wegner , Paul Steinmann","doi":"10.1016/j.eml.2024.102182","DOIUrl":"https://doi.org/10.1016/j.eml.2024.102182","url":null,"abstract":"<div><p>Photosensitive elastomers have the ability to undergo significant deformations upon the illumination by light of a specific wave length. Compared to other non-mechanical stimuli used in materials such as electro- or magneto-active polymers, light offers interesting advantages such as ultra high application speed and spatial precision. Moreover, as light powers and controls the movement of the material, the need for stiff wiring or external energy sources is eliminated. This becomes especially important in the design of miniature sized applications such as nano-scale robots. In the scope of the present work the conversion of photonic energy into a mechanical response originates from switching molecules embedded into a soft polymer matrix. Upon stimulation by UV-light, these molecules can switch from their stable <em>trans</em> - into a meta-stable <em>cis</em>-isomer, which induces a mechanical response on the macro scale. Depending on the experiment this can be visible as a deformation of the material or an increase in stiffness. This contribution presents the results of various mechanical and photo-mechanical experiments performed with the silicone Elastosil P 7670™ mixed with azobenzene molecules. These experiments are conducted in such a fashion that the obtained results are well suited for the identification of material parameters that arise from a photo-viscoelastic continuum modeling approach.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"70 ","pages":"Article 102182"},"PeriodicalIF":4.3,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352431624000622/pdfft?md5=deb711429c69bae05df230348fe74a99&pid=1-s2.0-S2352431624000622-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141481622","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}

引用次数: 0