Extreme Mechanics Letters最新文献_第10页

Unconventional fatigue failure of densified wood 致密木材的非常规疲劳失效

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-08-05 DOI: 10.1016/j.eml.2024.102218

Bo Chen , Qiongyu Chen , Ulrich H. Leiste , Yu Liu , Taotao Meng , Jiaqi Dai , Amy Gong , Liangbing Hu , William L. Fourney , Teng Li

引用次数: 0

Determining plastic slips in rate-independent crystal plasticity models through machine learning algorithms 通过机器学习算法确定与速率无关的晶体塑性模型中的塑性滑移

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-07-30 DOI: 10.1016/j.eml.2024.102216

Zhiwen Wang , Xianjia Chen , Jici Wen , Yujie Wei

{"title":"Determining plastic slips in rate-independent crystal plasticity models through machine learning algorithms","authors":"Zhiwen Wang , Xianjia Chen , Jici Wen , Yujie Wei","doi":"10.1016/j.eml.2024.102216","DOIUrl":"10.1016/j.eml.2024.102216","url":null,"abstract":"<div><p>Dislocation slip-based crystal plasticity models have been a great success in connecting the fundamental physics with the macroscopic deformation of crystalline materials. Pioneered by Taylor in his work on “plastic strain in metals” (Taylor, 1938), and further advanced by Bishop and Hill (1951a, 1951b), the Taylor–Bishop–Hill theory laid the foundation of today’s constitutive models on crystal plasticity. An intriguing part of those modeling is to determine the active slip systems—which system to be involved in and how much it contributes to the deformation. In this paper, we developed a machine learning-based algorithm to determine accurately and efficiently the active slip systems in crystal plasticity constitutive models. Applications to the common three polycrystalline metals, face-centered cubic (FCC) copper, body-centered cubic (BCC) α-iron, and hexagonal close-packed (HCP) AZ31B, demonstrate that even a simple neural network could give rise to accurate and efficient results in comparing with traditional routines. There seems to be plenty of space for further reducing the computation time and hence scaling up the simulating samples.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"71 ","pages":"Article 102216"},"PeriodicalIF":4.3,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881035","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

Fracture of Ti3C2-TiO2 atomically thin films Ti3C2-TiO2 原子薄膜的断裂

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-07-26 DOI: 10.1016/j.eml.2024.102211

Jianyu Dai, Congjie Wei, Chenglin Wu

引用次数: 0

Periodic tetrahedral auxetic metamaterial 周期性四面体辅助超材料

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-07-26 DOI: 10.1016/j.eml.2024.102214

A. Sorrentino, D. Castagnetti

引用次数: 0

Minimal activation with maximal reach: Reachability clouds of bio-inspired slender manipulators 最小激活，最大触及：生物启发细长机械手的可达性云图

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-07-25 DOI: 10.1016/j.eml.2024.102207

Bartosz Kaczmarski , Derek E. Moulton , Alain Goriely , Ellen Kuhl

{"title":"Minimal activation with maximal reach: Reachability clouds of bio-inspired slender manipulators","authors":"Bartosz Kaczmarski , Derek E. Moulton , Alain Goriely , Ellen Kuhl","doi":"10.1016/j.eml.2024.102207","DOIUrl":"10.1016/j.eml.2024.102207","url":null,"abstract":"<div><p>In the field of soft robotics, flexibility, adaptability, and functionality define a new era of robotic systems that can safely deform, reach, and grasp. To optimize the design of soft robotic systems, it is critical to understand their configuration space and full range of motion across a wide variety of design parameters. Here we integrate extreme mechanics and soft robotics to provide quantitative insights into the design of bio-inspired soft slender manipulators using the concept of reachability clouds. For a minimal three-actuator design inspired by the elephant trunk, we establish an efficient and robust reduced-order method to generate reachability clouds of almost half a million points each to visualize the accessible workspace of a wide variety of manipulator designs. We generate an atlas of 256 reachability clouds by systematically varying the key design parameters including the fiber count, revolution, tapering angle, and activation magnitude. Our results demonstrate that reachability clouds not only offer an immediately clear perspective into the inverse problem of control, but also introduce powerful metrics to characterize reachable volumes, unreachable regions, and actuator redundancy to quantify the performance of soft slender robots.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"71 ","pages":"Article 102207"},"PeriodicalIF":4.3,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141781029","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

Role of friction and geometry in tuning the bending stiffness of topologically interlocking materials 摩擦力和几何形状在调整拓扑交错材料弯曲刚度中的作用

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-07-25 DOI: 10.1016/j.eml.2024.102212

Tracy Lu , Ziran Zhou , Punnathat Bordeenithikasem , Norman Chung , Diana Frias Franco , Jose E. Andrade , Chiara Daraio

{"title":"Role of friction and geometry in tuning the bending stiffness of topologically interlocking materials","authors":"Tracy Lu , Ziran Zhou , Punnathat Bordeenithikasem , Norman Chung , Diana Frias Franco , Jose E. Andrade , Chiara Daraio","doi":"10.1016/j.eml.2024.102212","DOIUrl":"10.1016/j.eml.2024.102212","url":null,"abstract":"<div><p>Topologically interlocking material (TIM) systems offer adjustable bending stiffness controlled by external pre-stress, as shown in previous studies. This study focuses on a specific TIM system comprised of truncated tetrahedral particles interconnected via tensioned wires. The fabrication process involves weaving nylon wires through 3D printed truncated tetrahedrons that have longitudinal and latitudinal through-holes. By varying the tension applied to the wires, one can systematically control the overall bending stiffness of the TIM system. We change the surface friction and the contact angle between adjacent particles at a fixed wire tension, to study experimentally how they affect the system’s bending response. We inform experiments with Level Set Discrete Element Method (LS-DEM) simulations, to correlate surface friction and contact area changes with the system’s bending modulus. The numerical model is shown to be predictive and could be used in the future to evaluate designs of TIMs.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"71 ","pages":"Article 102212"},"PeriodicalIF":4.3,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141853495","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

Palmitoylation enhances short polar peptide permeation across stratum corneum lipid bilayer: A molecular dynamics study 棕榈酰化可增强短极性肽在角质层脂质双分子层中的渗透：分子动力学研究

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-07-23 DOI: 10.1016/j.eml.2024.102213

Choon-Peng Chng , Lu Zhang , Shikhar Gupta , Changjin Huang

{"title":"Palmitoylation enhances short polar peptide permeation across stratum corneum lipid bilayer: A molecular dynamics study","authors":"Choon-Peng Chng , Lu Zhang , Shikhar Gupta , Changjin Huang","doi":"10.1016/j.eml.2024.102213","DOIUrl":"10.1016/j.eml.2024.102213","url":null,"abstract":"<div><p>Designing chemical molecules that target the skin for non-invasive transdermal drug delivery is of significant interest for both wound healing and skincare applications. These skin-targeting molecules must permeate the outermost protective layer of the skin, the stratum corneum (SC), which consists of dead corneocytes embedded in a lipid matrix, to fulfill their biological functions. Adsorption onto and diffusion through the lipid matrix in the SC represent two key steps for the successful permeation of a skin-targeting molecule across the SC into the underlying skin layers. Here we compare the effects of cyclization and palmitoylation on the adsorption and diffusion of a short polar peptide across a model SC lipid bilayer using molecular dynamics simulations. The cyclized peptide showed slightly better binding to the SC lipid bilayer and similar interaction energies with SC lipids compared to the unmodified peptide. In contrast, the palmitoylated peptide exhibited much stronger interaction with SC lipids via insertion of its attached fatty acid tail into the SC lipid bilayer. The average diffusivity of the cyclized peptide across the SC lipid bilayer was approximately twice that of the unmodified peptide, whereas the palmitoylated peptide’s diffusivity was about 2.7 times higher. Thus, palmitoylation appears to be a promising strategy for enhancing the binding and permeability of short polar peptides across the SC lipid matrix.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"71 ","pages":"Article 102213"},"PeriodicalIF":4.3,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785943","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

Frequency-dependent electrochemical breakdown of hydrogel ionotronics 水凝胶离子电子学的频率依赖性电化学分解

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-07-22 DOI: 10.1016/j.eml.2024.102210

Yuechen Jiang , Yuwei Han , Zeyu Gao , Rong Xu , Kun Jia , Yecheng Wang

{"title":"Frequency-dependent electrochemical breakdown of hydrogel ionotronics","authors":"Yuechen Jiang , Yuwei Han , Zeyu Gao , Rong Xu , Kun Jia , Yecheng Wang","doi":"10.1016/j.eml.2024.102210","DOIUrl":"10.1016/j.eml.2024.102210","url":null,"abstract":"<div><p>When an ionic conductor meets an electronic conductor, ions and electrons couple at the interface between ionic and electronic circuits, enabling a class of devices: ionotronics. Such a coupling gives innovations but can cause electrochemical breakdown. Rapid advances in hydrogel ionotronics, in which hydrogel serves as stretchable, transparent, ionic conductor, highlight an urgent need: a general approach and criterion to study electrochemical breakdown under AC condition. Here we study the breakdown behavior of a metal-hydrogel-metal ionotronic system subject to alternating voltages of various frequencies and amplitudes. First, we apply a sinusoidal voltage to the ionotronic system which is connected in series to a load resistor, and compare the waveforms of the applied voltage and the output voltage between the two ends of the load resistor at various frequencies and amplitudes. Electrochemical breakdown tends to take place at low frequencies and high amplitudes, and causes distortion of waveform of the output voltage. Next, we develop an electric circuit model, in which each hydrogel-metal junction is modeled as a constant phase element in parallel with a leakage resistor and the hydrogel is modeled as a resistor. Our experiments show that the electrochemical window is insensitive to the frequency and amplitude of applied voltage, as well as to the concentration of ions in the hydrogel. Through a combination of experiment and theory, we further propose a frequency-amplitude phase diagram. Different from DC condition, the breakdown behavior under AC condition depends not only on the amplitude of applied voltage, but also on the frequency of applied voltage. We also show that electrochemical reaction can be retarded by stretching the hydrogel and by increasing the frequency. It is hoped that this work will guide the development of stable and reliable hydrogel ionotronic devices.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"71 ","pages":"Article 102210"},"PeriodicalIF":4.3,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141781030","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-assisted wood materials: Applications and future prospects 机器学习辅助木质材料：应用与未来展望

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-07-19 DOI: 10.1016/j.eml.2024.102209

Yuqi Feng , Saad Mekhilef , David Hui , Cheuk Lun Chow , Denvid Lau

{"title":"Machine learning-assisted wood materials: Applications and future prospects","authors":"Yuqi Feng , Saad Mekhilef , David Hui , Cheuk Lun Chow , Denvid Lau","doi":"10.1016/j.eml.2024.102209","DOIUrl":"10.1016/j.eml.2024.102209","url":null,"abstract":"<div><p>Wood and wood-based materials, surpassing their conventional image as mere stems and branches of trees, have found extensive utilization in diverse industrial sectors due to their low carbon footprint. Nonetheless, maximizing wood utilization and advancing multifunctional wood materials face challenges due to resource-intensive conventional approaches. Integrating machine learning (ML) in wood mechanics has emerged as a promising avenue for deeper exploration of this remarkable material. By leveraging advanced computational techniques, researchers can delve into wood's intricate properties and behavior, unraveling the complex interactions between its chemical constituents, microstructures, and mechanical characteristics. Combined with imaging and sensor technologies, ML contributes to efficient, fast, and real-time health detection of wood materials. This review aims to illuminate the transformative impact of ML in unlocking the hidden potential of wood, fostering innovative applications, and facilitating sustainable engineering solutions. The basic workflow of ML and its typical applications in property prediction, defect detection, and optimized design of wood materials are discussed, thereby highlighting the challenges and the need for future research.</p></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"71 ","pages":"Article 102209"},"PeriodicalIF":4.3,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141729249","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

Front cover CO1 封面 CO1

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-07-17 DOI: 10.1016/S2352-4316(24)00085-3

引用次数: 0