Extreme Mechanics Letters最新文献_第9页

Experiment-informed finite-strain inverse design of spinodal metamaterials spinodal超材料的实验有限应变反设计

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/j.eml.2024.102274

Prakash Thakolkaran , Michael Espinal , Somayajulu Dhulipala , Siddhant Kumar , Carlos M. Portela

{"title":"Experiment-informed finite-strain inverse design of spinodal metamaterials","authors":"Prakash Thakolkaran , Michael Espinal , Somayajulu Dhulipala , Siddhant Kumar , Carlos M. Portela","doi":"10.1016/j.eml.2024.102274","DOIUrl":"10.1016/j.eml.2024.102274","url":null,"abstract":"<div><div>Spinodal metamaterials, with architectures inspired by natural phase-separation processes, have presented a significant alternative to periodic and symmetric morphologies when designing mechanical metamaterials with extreme performance. While their elastic mechanical properties have been systematically determined, their large-deformation, nonlinear responses have been challenging to predict and design, in part due to limited data sets and the need for complex nonlinear simulations. This work presents a novel physics-enhanced machine learning (ML) and optimization framework tailored to address the challenges of designing intricate spinodal metamaterials with customized mechanical properties in large-deformation scenarios where computational modeling is restrictive and experimental data is sparse. By utilizing large-deformation experimental data directly, this approach facilitates the inverse design of spinodal structures with precise finite-strain mechanical responses. The framework sheds light on instability-induced pattern formation in spinodal metamaterials—observed experimentally and in selected nonlinear simulations—leveraging physics-based inductive biases in the form of nonconvex energetic potentials. Altogether, this combined ML, experimental, and computational effort provides a route for efficient and accurate design of complex spinodal metamaterials for large-deformation scenarios where energy absorption and prediction of nonlinear failure mechanisms is essential.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"74 ","pages":"Article 102274"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143045","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

Characterization of 3D printed micro-blades for cutting tissue-embedding material 用于组织包埋材料切割的3D打印微刀片的特性研究。

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/j.eml.2024.102288

Saisneha Koppaka, David Doan, Wei Cai, X. Wendy Gu, Sindy K.Y. Tang

{"title":"Characterization of 3D printed micro-blades for cutting tissue-embedding material","authors":"Saisneha Koppaka, David Doan, Wei Cai, X. Wendy Gu, Sindy K.Y. Tang","doi":"10.1016/j.eml.2024.102288","DOIUrl":"10.1016/j.eml.2024.102288","url":null,"abstract":"<div><div>Cutting soft materials on the microscale has emerging applications in single-cell studies, tissue microdissection for organoid culture, drug screens, and other analyses. However, the cutting process is complex and remains incompletely understood. Furthermore, precise control over blade geometries, such as the blade tip radius, has been difficult to achieve. In this work, we use the Nanoscribe 3D printer to precisely fabricate micro-blades (i.e., blades <1 mm in length) and blade grid geometries. This fabrication method enables a systematic study of the effect of blade geometry on the indentation cutting of paraffin wax, a common tissue-embedding material. First, we print straight micro-blades with tip radius ranging from ∼100 nm to 10 μm. The micro-blades are mounted in a custom nanoindentation setup to measure the cutting energy during indentation cutting of paraffin. Cutting energy, measured as the difference in dissipated energy between the first and second loading cycles, decreases as blade tip radius decreases, until ∼357 nm when the cutting energy plateaus despite further decrease in tip radius. Second, we expand our method to blades printed in unconventional configurations, including parallel blade structures and blades arranged in a square grid. Under the conditions tested, the cutting energy scales approximately linearly with the total length of the blades comprising the blade structure. The experimental platform described can be extended to investigate other blade geometries and guide the design of microscale cutting of soft materials.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"75 ","pages":"Article 102288"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143048804","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

Micropolar modeling for bending shape of 2D lattices: The case of equilateral triangular cell structure 二维网格弯曲形状的微极建模：以等边三角形单元结构为例

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/j.eml.2024.102281

L.H. He, C.Y. Shen

引用次数: 0

High bulk modulus pentamodes: the three-dimensional metal water 高体积模量五模态：三维金属水

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/j.eml.2024.102267

Giacomo Brambilla, Sebastiano Cominelli, Marco Verbicaro, Gabriele Cazzulani, Francesco Braghin

{"title":"High bulk modulus pentamodes: the three-dimensional metal water","authors":"Giacomo Brambilla, Sebastiano Cominelli, Marco Verbicaro, Gabriele Cazzulani, Francesco Braghin","doi":"10.1016/j.eml.2024.102267","DOIUrl":"10.1016/j.eml.2024.102267","url":null,"abstract":"<div><div>Despite significant advances in the field of phononic crystals, the development of acoustic metafluids that replicate the behaviour of liquids in three dimensions remains elusive. For instance, water – the quintessential pentamode (PM) material – has a bulk modulus two orders of magnitude higher than current state-of-the-art PMs. The need for a low shear modulus inherently conflicts with the desire of high bulk modulus and density. In this letter, we shed light on the limitations of existing PM geometries and propose an innovative shape for the links that constitute the network. Inspired by the kinematics of ropes, these links are constructed from thin fibres and demonstrate the potential to create PMs with properties akin to those of liquids. As a prime example, we propose the design of the first metamaterial that fully deserves the name <em>3D metal water</em>, since its acoustic properties in the low frequency regime are indistinguishable from water. Additionally, we highlight a shear band gap in the lattice dispersion diagram, and illustrate the influence of geometric parameters on the dynamic properties at higher frequencies. This novel design of metafluids holds promise for applications requiring anisotropic materials such as acoustic lenses, waveguides, and cloaks.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"74 ","pages":"Article 102267"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142518","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

Energy dissipation mechanism of G-phase and L-phase metallic glass nanofilms subjected to high-velocity nano-ballistic impact 高速纳米弹道冲击下g相和l相金属玻璃纳米膜的能量耗散机制

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/j.eml.2024.102280

Yujie Cheng , Yidi Shen , Qi An , Minqiang Jiang , Chenguang Huang , William A. Goddard III , Xianqian Wu

{"title":"Energy dissipation mechanism of G-phase and L-phase metallic glass nanofilms subjected to high-velocity nano-ballistic impact","authors":"Yujie Cheng , Yidi Shen , Qi An , Minqiang Jiang , Chenguang Huang , William A. Goddard III , Xianqian Wu","doi":"10.1016/j.eml.2024.102280","DOIUrl":"10.1016/j.eml.2024.102280","url":null,"abstract":"<div><div>The energy dissipation mechanisms of G-phase and L-phase metallic glass nanofilms subjected to high-velocity nano-particle impact were investigated by molecular dynamics (MD) simulations. We identified the phase transition from G-phase to L-phase in which the locally ordered core structures transform to liquid-like structures due to local mechanical melting and adiabatic heating of the G-phase under high strain rate impact. The appearance of phase transition provides a new channel for energy dissipation, thus the relatively thicker G-phase nanofilm with ordered core structures has a higher specific energy absorption compared with the L-phase film at the same thickness and impact velocity. However, if the thickness decreases below the characteristic length scale of the heterogeneous structure, the broken core structures in the G-phase films act as prefabricated defects that fail prematurely when subjected to impact, resulting in less impact resistance of the G-phase film compared to the L-phase film. This paper provides a useful method for improving the impact resistance of metallic glass films by tailoring the microstructures.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"74 ","pages":"Article 102280"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142519","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

Simulating flow-induced reconfiguration by coupling corotational plate finite elements with a simplified pressure drag 用简化压力阻力耦合旋转板有限元模拟流态重构

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/j.eml.2024.102271

Danick Lamoureux , Sophie Ramananarivo , David Melancon , Frédérick P. Gosselin

{"title":"Simulating flow-induced reconfiguration by coupling corotational plate finite elements with a simplified pressure drag","authors":"Danick Lamoureux , Sophie Ramananarivo , David Melancon , Frédérick P. Gosselin","doi":"10.1016/j.eml.2024.102271","DOIUrl":"10.1016/j.eml.2024.102271","url":null,"abstract":"<div><div>Developing engineering systems that rely on flow-induced reconfiguration, the phenomenon where a structure deforms under flow to reduce its drag, requires design tools that can predict the behavior of these flexible structures. Current methods include using fully coupled computational fluid dynamics and finite element analysis solvers or highly specialized theories for specific geometries. Coupled numerical methods are computationally expensive to use and non-trivial to setup, while specialized theories are difficult to generalize and take a long time to develop. A compromise between speed, accuracy, and versatility is required to be implemented into the design cycle of flexible structures under flow. This paper offers a new numerical implementation of the pressure drag in the context of a corotational finite element formulation on MATLAB. The presented software is verified against different semi-analytical theories applied to slender plates and disks cut along their radii as well as validated against experiments on kirigami sheets and draping disks. <strong>Usage:</strong> The developed code and verification cases presented here are available on GitHub <span><span>https://github.com/lm2-poly/FIRM</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"74 ","pages":"Article 102271"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143132","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

Humidity-induced actuation of silk yarn 丝绸纱线的湿度致动

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/j.eml.2024.102279

Yaping Chen , Lei Liu , Yuyang Xie , Jiongjiong Hu , Dabiao Liu

{"title":"Humidity-induced actuation of silk yarn","authors":"Yaping Chen , Lei Liu , Yuyang Xie , Jiongjiong Hu , Dabiao Liu","doi":"10.1016/j.eml.2024.102279","DOIUrl":"10.1016/j.eml.2024.102279","url":null,"abstract":"<div><div>Silkworm silk is a promising material for smart textiles due to its excellent mechanical properties, biocompatibility with human body, and remarkable hygroscopicity. Silk yarn can provide reversible and repeatable actuation responses during humidification-and-drying cycles. In this study, we investigate the torsional and tensile actuation performances of silk yarn stimulated by humidity from an experimental and theoretical perspective. We find that increasing the twist level and number of silk fibers significantly improves the actuation performance. Silk yarn undergoes an irreversible relaxation upon first being exposed to moisture. It exhibits a repeatable humidity-contraction stress response when wetted further. The actuation strain of silk yarn varies with humidity and increases monotonically with twist level. A theoretical model based on the water absorption equation and the standard reinforcing model is developed to describe the humidity-induced torsional and tensile actuation of silk yarn. The theoretical predictions agree well with the experiments. This work sheds light on the physical mechanisms of humidity-induced actuation in silk yarn and inspires the design of miniature soft actuators.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"74 ","pages":"Article 102279"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143133","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 前盖CO1

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/S2352-4316(25)00001-X

引用次数: 0

Electroadhesion-driven friction enhancement using electret films 利用驻极体薄膜的电粘附驱动的摩擦增强

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-12-01 DOI: 10.1016/j.eml.2024.102270

Shaoqi Huang, Yifan Li, Shuwen Zhang, Hu Zhao, Siyang Song, Chongpu Zhai, Minglong Xu

{"title":"Electroadhesion-driven friction enhancement using electret films","authors":"Shaoqi Huang, Yifan Li, Shuwen Zhang, Hu Zhao, Siyang Song, Chongpu Zhai, Minglong Xu","doi":"10.1016/j.eml.2024.102270","DOIUrl":"10.1016/j.eml.2024.102270","url":null,"abstract":"<div><div>Friction control has attracted significant attention due to its potential to improve device efficiency and reduce wear. However, achieving rapid, reversible, and robust friction regulation remains a persistent challenge. In this study, we propose a novel strategy for contact control using electret films, which can effectively modulate electroadhesion to enable large-scale friction control. We develop a general model describing the interfacial electro-mechanical coupling mechanism, which is validated through systematic experiments. Both experimental and theoretical results demonstrate that the relationship between the pull-off force and the applied interfacial voltage follows a parabolic curve, with its maxima mainly depending on the charge density, thickness, and dielectric constant of the electret film. With the electret film of about 50 μm in thickness and an applied voltage of approximately 300 V, both the static and dynamic friction coefficients can be increased to more than twice their initial values. This study provides valuable insights into the optimization of mechanical systems in terms of performance enhancement, lifespan extension, energy losses, and thermal management.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"73 ","pages":"Article 102270"},"PeriodicalIF":4.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747550","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

Automated de novo design of architectured materials: Leveraging eXplainable Artificial Intelligence (XAI) for inspiration from stochastic microstructure outliers 建筑材料的自动化从头设计：利用可解释的人工智能（XAI）从随机微观结构异常值中获得灵感

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2024-12-01 DOI: 10.1016/j.eml.2024.102269

Zhengkun Feng , Weijun Lei , Leidong Xu , Shikui Chen , Hongyi Xu

{"title":"Automated de novo design of architectured materials: Leveraging eXplainable Artificial Intelligence (XAI) for inspiration from stochastic microstructure outliers","authors":"Zhengkun Feng , Weijun Lei , Leidong Xu , Shikui Chen , Hongyi Xu","doi":"10.1016/j.eml.2024.102269","DOIUrl":"10.1016/j.eml.2024.102269","url":null,"abstract":"<div><div>Engineered architectured Materials, such as metamaterials with periodic patterns, achieve superior properties compared with their stochastic counterparts, such as the random microstructures found in natural materials. The primary research question focuses on the feasibility of learning advantageous microstructural features from stochastic microstructure samples to facilitate the generative design of periodic microstructures, resulting in unprecedented properties. Instead of relying on brainstorming-based, <em>ad hoc</em> design inspiration approaches, we propose an eXplainable Artificial Intelligence (XAI)-based framework to automatically learn critical features from the exceptional outliers (with respect to properties) in stochastic microstructure samples, enabling the generation of novel periodic microstructure patterns with superior properties. This framework is demonstrated on three benchmark cases: designing 2D cellular metamaterials to maximize stiffness in all directions, to maximize the Poisson’s ratio in all directions, and to minimize the thermal expansion ratio. The effectiveness of the design framework is validated by comparing its novel microstructure designs with known stochastic and periodic microstructure designs in terms of the properties of interest.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"73 ","pages":"Article 102269"},"PeriodicalIF":4.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747551","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