Extreme Mechanics Letters最新文献_第2页

Highly switchable and reversible soft sticky adhesives based on thermo-responsive phase separation

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

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

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

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

Tailored multiscale instabilities in a grid metamaterial

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-06 DOI: 10.1016/j.eml.2024.102284

Nicola Marasciuolo, Domenico De Tommasi, Francesco Trentadue, Gennaro Vitucci

引用次数: 0

Static and dynamic analysis of auxetic three-dimensional curved metamaterials in both axial and circumferential directions

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-04 DOI: 10.1016/j.eml.2024.102285

Mohamed Roshdy, Osama R. Bilal

{"title":"Static and dynamic analysis of auxetic three-dimensional curved metamaterials in both axial and circumferential directions","authors":"Mohamed Roshdy, Osama R. Bilal","doi":"10.1016/j.eml.2024.102285","DOIUrl":"10.1016/j.eml.2024.102285","url":null,"abstract":"<div><div>Metamaterials can enable unique mechanical properties based on their geometry rather than their chemical composition. Such properties can go beyond what is possible using conventional materials. Most of the existing literature consider metamaterials in Cartesian coordinates with zero curvature. However, realistic utilization of meta-structures is highly likely to involve a degree of curvature. In this paper, we study both the effective static and dynamic properties of metamaterials in the presence of curvature. To capture the effect of curvature on the static behavior of our metamaterial, we calculate the effective Poisson’s ratio of the metamaterial in the presence of curvature. We conduct our analysis on three-dimensional metamaterials with varying effective Poisson’s ratio. We observe a significant change in the values of the effective Poisson’s ratio of the metamaterial due to curvature. To capture the effect of curvature on the dynamics of our metamaterials, we calculate dispersion curves of curved metamaterial at different circumferential directions. We show both numerically and experimentally the change of the dynamic behavior of auxetic metamaterial from attenuation to transmission and vice-versa due to curvature. Our findings underscore the importance of curvature in both static and dynamic analysis of metamaterial design and could provide the means to guide practical implementations of metamaterials for functional use.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"75 ","pages":"Article 102285"},"PeriodicalIF":4.3,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175333","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

Simultaneous manipulation of elastic and acoustic waves in acousto-elastic metamaterial beams

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-03 DOI: 10.1016/j.eml.2024.102286

Chang Fu , Xiao-Lei Tang , Yi-Da Liu , Tian-Xue Ma , Yue-Sheng Wang

{"title":"Simultaneous manipulation of elastic and acoustic waves in acousto-elastic metamaterial beams","authors":"Chang Fu , Xiao-Lei Tang , Yi-Da Liu , Tian-Xue Ma , Yue-Sheng Wang","doi":"10.1016/j.eml.2024.102286","DOIUrl":"10.1016/j.eml.2024.102286","url":null,"abstract":"<div><div>In this paper, one-dimensional (1D) acousto-elastic metamaterial (AEMM) beams are proposed for simultaneous control of elastic and acoustic waves. The AEMM beam is formed by attaching hollow cylinders periodically on the surface of an elastic beam. In the elastic case, the characteristics of flexural waves are analyzed. On the other hand, the AEMM beam supports the guidance of surface acoustic waves. The band structures as well as the frequency responses of the AEMM beam are numerically calculated by employing the finite element approach. For either elastic flexural waves or surface acoustic waves, the band-gaps can be effectively modified by varying the geometry of the hollow cylinders. Furthermore, according to the concept of mode gap, the AEMM beam with a point defect is designed by changing the geometric configuration for dual wave confinement. For the experimental verification, the perfect and defected AEMM beams are fabricated through 3D-printing. The existence of passbands and band-gaps for elastic and acoustic waves is demonstrated numerically and experimentally. Moreover, simultaneous localization of elastic and acoustic waves within the defected AEMM beam is observed.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"75 ","pages":"Article 102286"},"PeriodicalIF":4.3,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175820","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

Predicting biaxial failure strengths of aortic tissues using a dispersed fiber failure model

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-02 DOI: 10.1016/j.eml.2024.102287

Hutomo Tanoto , Zhongxi Zhou , Kaijia Chen , Riuxin Qiu , Hanwen Fan , Jacob Zachary Chen , Ethan Milton , Yuxiao Zhou , Minliang Liu

{"title":"Predicting biaxial failure strengths of aortic tissues using a dispersed fiber failure model","authors":"Hutomo Tanoto , Zhongxi Zhou , Kaijia Chen , Riuxin Qiu , Hanwen Fan , Jacob Zachary Chen , Ethan Milton , Yuxiao Zhou , Minliang Liu","doi":"10.1016/j.eml.2024.102287","DOIUrl":"10.1016/j.eml.2024.102287","url":null,"abstract":"<div><div>Despite advances in methods to incorporate patient-specific aortic geometries and tissue elastic properties into computational rupture risk analyses of aortic aneurysms, isotropic failure metrics remain widely used for aortic tissue, which oversimplifies its anisotropic failure characteristics. While classical failure criteria for engineered unidirectional fiber-reinforced composites demonstrate improved performance over isotropic metrics in predicting aortic failure properties, an accurate failure metric tailored to the aorta that accounts for dispersed collagen fiber architecture remains largely undeveloped and requires experimental validation. In this study, we employed a novel dispersed fiber failure metric that considers fiber dispersion and assessed its ability to predict the biaxial failure strengths of the aortic wall. We conducted off-axis uniaxial and planar biaxial failure tests, from which anisotropic failure strengths of aortic tissues were obtained through digital image correlation analysis. The off-axis uniaxial data were used to calibrate the failure model parameters, while the biaxial failure data provided direct experimental validations. Using this approach, we evaluated the performance of two variants of the dispersed fiber failure metric: the dispersed Tsai-Hill and dispersed Hashin-Rotem models, comparing them to their unidirectional counterparts. Results showed that the dispersed Tsai-Hill and dispersed Hashin-Rotem models outperformed their unidirectional counterparts, reducing errors by 33.8 % and 34.3 %, respectively. These findings highlight the significance of incorporating fiber dispersion in models that predict aortic tissue failure.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"75 ","pages":"Article 102287"},"PeriodicalIF":4.3,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174704","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

Experiment-informed finite-strain inverse design of spinodal metamaterials

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

A non-iterative numerical approach for visco-elasto-hydrodynamic lubrication problems

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/j.eml.2024.102278

Ashwin Sahasranaman , Chung Yuen Hui

{"title":"A non-iterative numerical approach for visco-elasto-hydrodynamic lubrication problems","authors":"Ashwin Sahasranaman , Chung Yuen Hui","doi":"10.1016/j.eml.2024.102278","DOIUrl":"10.1016/j.eml.2024.102278","url":null,"abstract":"<div><div>In lubrication applications, a common scenario involves a hard solid in contact with a soft viscoelastic substrate. However, most of the existing literature focuses on the case of an elastic substrate. In this paper, we introduce a numerical method that overcomes the challenges of converging iterative techniques and is specifically designed to handle viscoelastic substrates described by a Prony series. Our approach is fully automated, stable, and efficient, requiring only the solution of a linear matrix equation at each time step. We apply this method to investigate the transient squeezing of a thin liquid film between a rigid spherical indenter and a soft viscoelastic substrate. We explore intriguing differences between the EHL (Elasto-hydrodynamic lubrication) problem and three viscoelastic substrates with single and multiple relaxation times to understand how temporally evolving stiffness affects the pressure, surface displacement, and liquid film thickness. One of the key differences between the EHL and the VEHL (Visco-elasto-hydrodynamic lubrication) problem comes to light upon looking at the entrapped volume which can be held nearly constant when using a viscoelastic substrate whereas elastic substrates show exponential decay.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"74 ","pages":"Article 102278"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143137","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