Extreme Mechanics Letters最新文献_第7页

A coarse-grained mechanical framework for twisted van der Waals layered materials 扭曲范德华层状材料的粗粒度机械框架

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-02-17 DOI: 10.1016/j.eml.2025.102304

Weidong Yan , Wengen Ouyang , Ze Liu

{"title":"A coarse-grained mechanical framework for twisted van der Waals layered materials","authors":"Weidong Yan , Wengen Ouyang , Ze Liu","doi":"10.1016/j.eml.2025.102304","DOIUrl":"10.1016/j.eml.2025.102304","url":null,"abstract":"<div><div>The moiré superlattice, arising from the interlayer twisting of van der Waals (vdW) layered materials, dominates their in-plane and out-of-plane deformations, playing a pivotal role in determining the physical and mechanical properties of vdW layered materials. However, simulating the moiré superlattice-dependent mechanical behavior encounters spatiotemporal limitations from atomistic simulations. In this work, a general coarse-grained (CG) model is developed for twisted vdW layered materials, where moiré superlattices are represented as coarse particles with equivalent system energy. Comparative analysis with MD simulation results demonstrates that the developed CG model accurately reproduce the mechanical properties of vdW layered materials while capturing the influence of moiré superlattices on the out-of-plane deformation. Notably, the CG model significantly enhances computational efficiency, achieving orders of magnitude improvement depending on the twisted angle. This approach paves the way for large-scale computational simulation of twisted vdW layered materials and bridge the gap between atomistic simulations at nanoscale and experiments at micro/macroscale.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"76 ","pages":"Article 102304"},"PeriodicalIF":4.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463423","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

Bed-of-Nails effect: Unraveling the insertion behavior of aerosol jet 3D printed microneedle array in soft tissue Bed-of-Nails效应：揭示气溶胶喷射3D打印微针阵列在软组织中的插入行为

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-02-12 DOI: 10.1016/j.eml.2025.102301

Sanjida Jahan , Arushi Jain , Stefano Fregonese , Chunshan Hu , Mattia Bacca , Rahul Panat

{"title":"Bed-of-Nails effect: Unraveling the insertion behavior of aerosol jet 3D printed microneedle array in soft tissue","authors":"Sanjida Jahan , Arushi Jain , Stefano Fregonese , Chunshan Hu , Mattia Bacca , Rahul Panat","doi":"10.1016/j.eml.2025.102301","DOIUrl":"10.1016/j.eml.2025.102301","url":null,"abstract":"<div><div>Implantable biomedical devices often contain rigid components such as microneedles, Si chips, and sensors, that can frequently come in physical contact with soft biological tissue. Brain-computer-interfaces (or BCIs) are an example of such devices where an array of microelectrodes is inserted in the brain to record neuronal activity, stimulate neurons for neuro-prosthetics, and treat neurodegenerative diseases. Recently, CMU Array, a customizable ultra-high-density aerosol jet (AJ) 3D nanoprinted BCI platform was developed by the authors to record action potentials from throughout the 3D volume of the brain. Although the mechanics of insertion of a single sharp needle in biological tissue has been studied, the behavior of an array is still not fully understood. In this paper, we develop a linear elastic model for insertion of multiple microneedles in close proximity with each other and determine the severity of the bed-of-nails effect, when interacting strain fields from neighboring needles fail to cause clean needle insertion into the tissue. We then carry out experiments where an array of 3D-printed and sintered microneedles (80–90 µm diameter, 1 mm long, tip radius of the order of 10 µm) are inserted in agarose, that acts as a phantom brain. We show that our model can predict the experimentally measured peak force, agarose displacement, and energy absorbed during insertion for arrays with microneedles at increasing distance from one another. We show that for our system, the microneedles in the array act completely independent of each other when they are roughly 8–10 needle diameters apart, consistent with the model predictions. This work is fundamental to the understanding of the insertion mechanics and related deformation/damage caused by rigid microscale objects implanted in various soft biological tissue.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"77 ","pages":"Article 102301"},"PeriodicalIF":4.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428821","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

Synergizing machine learning and multiscale shakedown method for shakedown loading capacity evaluation of parameterized lattice structures 基于机器学习和多尺度安定法的参数化晶格结构安定承载能力评估

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-02-03 DOI: 10.1016/j.eml.2025.102297

Lizhe Wang , Fuyuan Liu , Min Chen , Zhiyun Mao , Geng Chen , Zhichao Zhang , Zhouyi Xiang

{"title":"Synergizing machine learning and multiscale shakedown method for shakedown loading capacity evaluation of parameterized lattice structures","authors":"Lizhe Wang , Fuyuan Liu , Min Chen , Zhiyun Mao , Geng Chen , Zhichao Zhang , Zhouyi Xiang","doi":"10.1016/j.eml.2025.102297","DOIUrl":"10.1016/j.eml.2025.102297","url":null,"abstract":"<div><div>In recent years, advanced soft computing methodologies have emerged as more effective than traditional approaches in estimating fatigue properties. However, a significant research gap remains in efficiently and accurately evaluating the multiaxial loading capacities of lattice structures and the impact of mesoscale design parameters, especially under unknown cyclic conditions during operation. To address this, we propose a data-driven methodology that integrates a multiscale shakedown evaluation method with a hybrid machine learning (HML) model. Our HML model, incorporating ensemble learning techniques and hyperparameter tuning via random search, accurately predicts the multiaxial shakedown fatigue loading capacity of a representative peanut-shaped auxetic lattice structure with parameterized geometry. The HML model's exceptional performance, demonstrated by a Normalized Root Mean Squared Error (NRMSE) of 0.018 and a coefficient of determination (R<sup>2</sup>) of 0.945, underscores its reliability, precision, and practicality. Additionally, sensitivity-based parametric analyses reveal the significant influence of center distance and edge width on the multiaxial fatigue properties of the lattice structure. This work offers an efficient tool for quantifying the contributions of various design parameters and loading conditions to multiaxial shakedown loading capacities.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"75 ","pages":"Article 102297"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143360549","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

Prolonged fracture resistance of hydrogels through spontaneous network reconfiguration 通过自发网络重构延长水凝胶的抗裂性

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-02-03 DOI: 10.1016/j.eml.2025.102298

Yihang Xiao , Yimin Zeng , Binhong Liu , Ruobing Bai , Wei Hong , Canhui Yang

{"title":"Prolonged fracture resistance of hydrogels through spontaneous network reconfiguration","authors":"Yihang Xiao , Yimin Zeng , Binhong Liu , Ruobing Bai , Wei Hong , Canhui Yang","doi":"10.1016/j.eml.2025.102298","DOIUrl":"10.1016/j.eml.2025.102298","url":null,"abstract":"<div><div>In engineering applications, hydrogels are often susceptible to fatigue loads, either static or dynamic. Extensive efforts have been devoted to studying dynamic fatigue facture of hydrogels, which promotes the understanding of underlying mechanisms and facilitates the design and synthesis of fatigue-fracture-resistant hydrogels under cyclic loads. In stark contrast, lifetime of hydrogels under static loading is much less investigated and hydrogels resistant to delayed fracture have not been reported. Here we propose a mechanism against delayed fracture by deconcentrating stress at crack tip through spontaneous network reconfiguration, during which reversible crosslinks dissociate to relieve stress and reassociate to reconstruct the polymer network in a stress-free manner. We validate the proposed mechanism by investigating the delayed fracture behaviors of polyacrylamide hydrogels with reversible and irreversible crosslinks. We show that a hydrogel with reversible crosslinks exhibits a threshold against delayed fracture, > 132 J/m<sup>2</sup>, one order of magnitude higher than that of its counterpart with irreversible crosslinks, ∼13 J/m<sup>2</sup>, which obeys the Lake-Thomas prediction. We provide further validations, including experimental observations on training-enhanced fracture stretch, decreased threshold for delayed fracture at a lower rate of network reconfiguration, prominent stress relaxation, as well as numerical simulations. Evidently, spontaneous network reconfiguration offers an effective way to deconcentrate stress at the crack tip for prolonged resistance to fracture.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"75 ","pages":"Article 102298"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143198083","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

Softening effect on thick-walled tube inflation and bulging instability 厚壁管膨胀与胀形失稳的软化效应

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-02-01 DOI: 10.1016/j.eml.2025.102296

Pierre-Yves Corbel, Julien Jumel

引用次数: 0

On-demand manipulation of topological states using Miura-folded metamaterials 使用miura折叠的超材料按需操纵拓扑状态

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-30 DOI: 10.1016/j.eml.2025.102294

Shuaifeng Li , Yu Bin Oh , Seong Jae Choi , Panayotis G. Kevrekidis , Jinkyu Yang

引用次数: 0

Highly switchable and reversible soft sticky adhesives based on thermo-responsive phase separation 基于热响应相分离的高度可切换和可逆的软粘性粘合剂

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-24 DOI: 10.1016/j.eml.2025.102293

Qianfeng Yin , Yilmaz Arin Manav , Yichen Wan , Benyamin Davaji , Ruobing Bai

{"title":"Highly switchable and reversible soft sticky adhesives based on thermo-responsive phase separation","authors":"Qianfeng Yin , Yilmaz Arin Manav , Yichen Wan , Benyamin Davaji , Ruobing Bai","doi":"10.1016/j.eml.2025.102293","DOIUrl":"10.1016/j.eml.2025.102293","url":null,"abstract":"<div><div>Many biological systems can switch between strong adhering and non-adhering states to various materials with complex shapes and sizes in a reversible manner. By contrast, synthetic soft sticky adhesives, or pressure-sensitive adhesives, still face challenges in combining high switchability, reversible switching, facile switching operation, and applicability to diverse materials, shapes, and sizes. To address this challenge, here we present a highly switchable and reversible soft sticky adhesive based on thermal-induced phase separation in a thermo-responsive hydrogel. At room temperature, the hydrogel adhesive is toughened by nanoclay as noncovalent crosslinkers, showing an adhesion strength of 60–80 kPa to various adherends. This adhesion is almost completely switched off upon heating, with a residual strength of around 1 kPa. The switching is reversible for many cycles, enabling selective pick-and-release of objects with various materials, shapes, sizes, and weights. The switching time is around 10 s with an adhesive layer of 1 mm, governed by thermal conduction through the adhesive, faster than or comparable to most state-of-the-art methods. The adhesive is self-healing, and can be recycled, dried, stored, reswollen, and reused with nearly intact adhesion and switching properties. These features are hoped to advance technologies such as on-demand device disassembly for recycling, assembly-based manufacturing, biomimetic robots, and human-machine interfaces.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"75 ","pages":"Article 102293"},"PeriodicalIF":4.3,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175299","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

Design and analysis of quadruple Waterbomb origami with multi-stability 具有多稳定性的四重水弹折纸设计与分析

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-23 DOI: 10.1016/j.eml.2025.102295

Jituo Li , Haipeng Zhang , Juncai Long , Guodong Lu

{"title":"Design and analysis of quadruple Waterbomb origami with multi-stability","authors":"Jituo Li , Haipeng Zhang , Juncai Long , Guodong Lu","doi":"10.1016/j.eml.2025.102295","DOIUrl":"10.1016/j.eml.2025.102295","url":null,"abstract":"<div><div>In this paper, after investigating the folding behavior and bistable positions of the sixfold Waterbomb, we propose a novel origami structure, multi-stable quadruple Waterbomb origami (QWO), which is designed as a composition of four sixfold Waterbombs. QWO exhibits three stable configurations under axial symmetric conditions. By controlling the pushing inward and popping outward of the Waterbomb center, two alternative folding paths can be generated, which achieves easy folding and high-stiffness in the axial direction, respectively. When the structural symmetry is disrupted, QWO exhibits four stable configurations in axial bending. We develop a truss model of QWO, and the energy landscape derived from it confirms the tri-stable property under symmetric deformation along its axis. Moreover, the high stiffness of the third stable state of QWO is verified by physical compression experiments. A novel QWO tube is fabricated by connecting QWO units in series. Each QWO in the tube can be deformed independently, which avoids the problem of interlayer motion coupling that commonly occurs in existing Waterbomb origami tubes. Our QWO tube offers diverse spatial configurations and mechanical properties that can be potentially used in mimicking the deformation of strip-shaped soft organisms.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"75 ","pages":"Article 102295"},"PeriodicalIF":4.3,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175300","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

A novel auxetic acoustic metamaterial plate with enlarged bandgap 一种新型放大带隙的消声超材料板

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-19 DOI: 10.1016/j.eml.2025.102291

Wei Zhong Jiang , Yi Zhang , Yu Ming Luo , Gui Lei Chen , Yang Pan , Han Yan , Xin Ren

{"title":"A novel auxetic acoustic metamaterial plate with enlarged bandgap","authors":"Wei Zhong Jiang , Yi Zhang , Yu Ming Luo , Gui Lei Chen , Yang Pan , Han Yan , Xin Ren","doi":"10.1016/j.eml.2025.102291","DOIUrl":"10.1016/j.eml.2025.102291","url":null,"abstract":"<div><div>In the future, to meet the complex and changeable conditions of the actual environment, the development of multi-functional metamaterials that can realize the superposition of multiple properties is attractive. In this work, a novel acoustic metamaterial based on variable stiffness factor (VSF) perforated plates is proposed. Based on Bloch theorem, the dispersion curves of the proposed structures are calculated using finite element software, and the results are verified by calculating the transmission loss curves. The bandgap characteristics can be slightly improved by varying the VSF values. Compared with positive and negative Poisson’s ratio metamaterials with the same porosity, the proposed structure can achieve lower frequency and wider bandgap. Secondly, the two typical acoustic metamaterials proposed in this paper have ultra-wide bandgap widths of 121 % and 112 % respectively. With the change of strain, the bandgap of the structure can be adjusted in real-time, which is valuable for the study of low-frequency bandgap. The new findings in this paper promote the development of columnar metamaterials and also provide a new idea for the study of multi-property superimposed metamaterials.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"75 ","pages":"Article 102291"},"PeriodicalIF":4.3,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175334","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

Pulsed current induced twin junction for tuning flow stress and strain delocalization in Ti3Al single crystal 脉冲电流诱导双结调节Ti3Al单晶流动应力和应变离域

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-18 DOI: 10.1016/j.eml.2025.102292

Xin Qin , Yiqi Zhu , Yuxuan Chen , Shuai Wang , Min Yi

{"title":"Pulsed current induced twin junction for tuning flow stress and strain delocalization in Ti3Al single crystal","authors":"Xin Qin , Yiqi Zhu , Yuxuan Chen , Shuai Wang , Min Yi","doi":"10.1016/j.eml.2025.102292","DOIUrl":"10.1016/j.eml.2025.102292","url":null,"abstract":"<div><div>TiAl alloys have garnered significant attention due to their excellent mechanical properties at high temperatures. However, the <span><math><msub><mrow><mi>α</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>-Ti<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>Al phase in TiAl alloys exhibits brittleness at room temperature, making TiAl alloys susceptible to failure. Pulsed current (PC) can induce athermal electro-plasticity in metallic materials, and is thus possible to tune the microstructure and mechanical behavior of TiAl alloys. Herein, we explore the PC-assisted tuning of flow stress and strain delocalization at room temperature and the associated atomistic mechanisms in Ti<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>Al single crystal by molecular dynamics simulation. It is found that the room-temperature flow stress decreases with increasing PC density. The tunability of flow stress could be ascribed to the PC-induced twin junction that originated from the PC regulated body-centered cubic phase distribution in Ti<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>Al. By analyzing the shear strain distribution and microstructure evolution, the PC-induced twin junctions are revealed to effectively alleviate the local strain accumulation at twin boundaries, thus promoting the strain delocalization of Ti<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>Al single crystal. Our findings on the PC-induced twin junctions for tuning flow stress and strain delocalization in Ti<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>Al single crystal could provide new insights for the electrically assisted regulation of mechanical behavior of TiAl alloys.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"75 ","pages":"Article 102292"},"PeriodicalIF":4.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175298","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