Extreme Mechanics Letters最新文献_第2页

Conditional stability in metamaterials: Experiments, modeling, and 3D design 超材料的条件稳定性：实验、建模和3D设计

IF 4.5 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-08-07 DOI: 10.1016/j.eml.2025.102393

G. Risso , L. Pesaresi , A.S. Meeussen , K. Bertoldi

引用次数: 0

Model elasto-plastic metamaterials as generic computing platforms 模拟弹塑性超材料作为通用计算平台

IF 4.5 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-08-06 DOI: 10.1016/j.eml.2025.102390

Laura Michel, Frédéric Lechenault

{"title":"Model elasto-plastic metamaterials as generic computing platforms","authors":"Laura Michel, Frédéric Lechenault","doi":"10.1016/j.eml.2025.102390","DOIUrl":"10.1016/j.eml.2025.102390","url":null,"abstract":"<div><div>Mechanical metamaterials are engineered materials constructed from elementary building blocks, typically arranged in regular patterns. These materials are generally studied for their effective properties, which are determined by the arrangement of their building blocks rather than the material they are made of. However, new functionalities are emerging, with mechanical metamaterials now exhibiting capabilities similar to conventional computers. For instance, they have been used to store binary data and even perform simple computations such as small binary additions and multiplications. These computing devices could be valuable in extreme environments where traditional electronic systems fail to operate. Moreover, they can process data autonomously without requiring a sustained power source. Despite this potential, there are no established design principles for systematically developing such computational materials. In this work, we explore the use of a model elasto-plastic metamaterial – a two-dimensional lattice composed of linear and bistable spring–mass systems – for executing sequential algorithms. While previous studies on mechanical computing mostly focused on small devices, we show that the lattice can be crafted to execute algorithms with many steps and large inputs, such as <span><math><mi>n</mi></math></span>-bit binary number additions. To our knowledge, this model has never been used for computational purposes before. This work thus offers a novel perspective on such models, proposing them as generic computing platforms that can be harnessed to design new computational materials.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"79 ","pages":"Article 102390"},"PeriodicalIF":4.5,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144830269","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

Peeling a rigid sphere from a stretched rubber substrate 从拉伸的橡胶基材上剥下坚硬的球体

IF 4.5 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-07-26 DOI: 10.1016/j.eml.2025.102381

Christopher W. Barney , Yue (Luna) Zheng

引用次数: 0

Non-local elastic lattices with PT-symmetry and time modulation: From perfect trapping to the wave boomerang effect 具有pt对称和时间调制的非局部弹性晶格：从完美的俘获到波回旋效应

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-07-25 DOI: 10.1016/j.eml.2025.102383

Emanuele Riva

{"title":"Non-local elastic lattices with PT-symmetry and time modulation: From perfect trapping to the wave boomerang effect","authors":"Emanuele Riva","doi":"10.1016/j.eml.2025.102383","DOIUrl":"10.1016/j.eml.2025.102383","url":null,"abstract":"<div><div>Wave motion is fundamentally constrained by the dispersion properties of the medium, often making it challenging — or even impossible — to guide wave packets along desired trajectories, particularly when wave inversion is required. The paper illustrates how one-dimensional (1D) and two-dimensional (2D) non-Hermitian elastic lattices with time-varying non-local feedback interactions offer unprecedented wave guidance. By relaxing the constraint of Hermiticity while preserving <span><math><mi>PT</mi></math></span>-symmetry of the nonlocal interactions, it is herein built a framework where the dispersion transitions from positive to negative group velocity, passing through an intermediate regime characterized by a perfectly flat band across all momenta. This effect, realized within the unbroken <span><math><mi>PT</mi></math></span>-symmetric phase, is further enhanced by the time modulation of lattice parameters, thereby unlocking functionalities such as perfect trapping, where a wave packet is intentionally stopped, and the wave boomerang effect, where the wave packet is reversed or guided back to its initial position. The framework presented in this paper unlocks opportunities that extend beyond wave guidance, including information processing through dispersion engineering in elastic media.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"79 ","pages":"Article 102383"},"PeriodicalIF":4.3,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704221","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

Modeling the hardening behavior of rubber-like elastomers under high hydrostatic pressure 模拟类橡胶弹性体在高静水压力下的硬化行为

IF 4.5 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-07-25 DOI: 10.1016/j.eml.2025.102397

Yukai Zhao , Xuxu Yang , Fanghao Zhou , Siyang Li , Tiefeng Li

引用次数: 0

Inverse design of mechanical metamaterials balancing manufacturability and compactness: A case study on lattice cells 平衡可制造性和紧凑性的机械超材料的反设计：以晶格单元为例

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-07-25 DOI: 10.1016/j.eml.2025.102395

Jiacheng Xue, Hanmeng Bao, Tengfei Liu, Lingling Wu, Xiaoyong Tian, Dichen Li

{"title":"Inverse design of mechanical metamaterials balancing manufacturability and compactness: A case study on lattice cells","authors":"Jiacheng Xue, Hanmeng Bao, Tengfei Liu, Lingling Wu, Xiaoyong Tian, Dichen Li","doi":"10.1016/j.eml.2025.102395","DOIUrl":"10.1016/j.eml.2025.102395","url":null,"abstract":"<div><div>Mechanical metamaterials are artificially engineered structures designed to exhibit unique and extraordinary mechanical properties. In recent years, machine learning has provided a more efficient and systematic approach, enabling inverse design of mechanical metamaterials, which allow for a broader exploration of material properties and support the integration of multifunctionality, significantly speeding up the design process. Despite the many advantages of inverse design, metamaterials often involve a trade-off between competing performance metrics-such as manufacturability and structural compactness. Furthermore, these trade-offs should be dynamically adjusted based on different additive manufacturing conditions. To address this, we proposed a regressional and conditional generative adversarial network based multi-objective (RCGAN-MO) architecture, which simultaneously handles the inverse design and adjustable multi-objective optimization of mechanical metamaterials. The RCGAN-MO includes two trained neural networks: a generator and a predictor, along with a weighted multi-objective optimizer. As a case study, the RCGAN-MO architecture is applied to the inverse design of the relative compressive elastic modulus for a metamaterial, and metamaterials with different weight vector values in the multi-objective optimizer are achieved through 3D printed prototypes. This approach achieves high accuracy and could adjust the importance of manufacturability and compactness, offering a flexible, scalable solution for engineering metamaterials tailored to practical application demands.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"79 ","pages":"Article 102395"},"PeriodicalIF":4.3,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704220","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

Hard-to-soft part ratios in natural crawlers inform hybrid robotic design 自然履带的软硬零件比为混合动力机器人的设计提供了依据

IF 4.5 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-07-25 DOI: 10.1016/j.eml.2025.102394

Jiayi Lei , Changhong Linghu , Min Pan , K. Jimmy Hsia

{"title":"Hard-to-soft part ratios in natural crawlers inform hybrid robotic design","authors":"Jiayi Lei , Changhong Linghu , Min Pan , K. Jimmy Hsia","doi":"10.1016/j.eml.2025.102394","DOIUrl":"10.1016/j.eml.2025.102394","url":null,"abstract":"<div><div>Most robots to date consist of either entirely hard parts or entirely soft parts. Nature, however, achieves a balance between hard and soft components, offering both adaptability and strength for adequate load-carrying capacity and locomotion in diverse environments. Inspired by nature, hybrid robotic designs, combining the flexibility of soft robots with the control and load-bearing capacity of hard robots, are being pursued. However, a proper range of the Hard-to-Soft Part Ratio (H2S-R) for the desirable performance of hybrid robots remains unclear. With a focus on crawlers, this study comprehensively compiles the H2S-R in crawling animals of four locomotion mechanisms: two-anchor, peristaltic, undulatory, and multi-legged crawling, and analyzes the trends and scaling in their performances. Results show distinct ranges of H2S-R in natural crawlers: 0.0005–0.003 for two-anchor crawlers, 0.08–0.09 for peristaltic, 0.02–0.08 for undulatory, and 1.0–2.4 for multi-legged. Within these ranges, except for the undulatory locomotion, increasing the H2S-R generally enhances their normalized crawling speed measured in body-lengths per second. Data for natural crawlers also show different ranges of normalized speeds as well as distinct scaling laws for different mechanisms. Comparisons with the performance of natural crawlers indicate that robotic crawlers have yet to achieve their full potential in crawling speed. This study provides guidelines for designing bio-inspired hybrid robots with potential applications in search and rescue, environmental monitoring, space exploration, and medical robotics.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"79 ","pages":"Article 102394"},"PeriodicalIF":4.5,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144771013","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

Determination of high strain-rate, viscoelastic material properties of soft solids using inertial microcavitation in a thin layer 利用惯性微空化在薄层中测定软固体的高应变率粘弹性材料性能

IF 4.5 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-07-25 DOI: 10.1016/j.eml.2025.102378

Surya Sidhartha Kolluri , Elizabeth C. Bremer-Sai , Anastasia Tzoumaka , Christian Franck , David L. Henann

{"title":"Determination of high strain-rate, viscoelastic material properties of soft solids using inertial microcavitation in a thin layer","authors":"Surya Sidhartha Kolluri , Elizabeth C. Bremer-Sai , Anastasia Tzoumaka , Christian Franck , David L. Henann","doi":"10.1016/j.eml.2025.102378","DOIUrl":"10.1016/j.eml.2025.102378","url":null,"abstract":"<div><div>Determining the high strain-rate mechanical properties of soft hydrogels and biological tissues is important for a number of biological and engineering applications but remains challenging due to the high compliance of these materials. Inertial microcavitation rheometry (IMR) is a recently developed experimental technique aimed at addressing this need and requires the optical resolution of cavitation bubble kinematics via high-speed videography. While this approach works well for optically transparent samples of dimensions much larger than the typical micron to sub-millimeter bubble sizes, IMR is challenged in highly light scattering media, such as nearly opaque tissues. One remedy to decrease the light scattering within a tissue is to prepare a thinner sample, which facilitates successful recording of the cavitation bubble dynamics. However, the thickness of the required thin samples can approach the size of the microbubbles, and the resulting confinement of the soft material layer between two boundaries changes the fundamental character of the assumed nearly infinite domain of the IMR theoretical framework, leading to erroneous material property estimates. To address this issue and to facilitate successful application of IMR to thin layers of soft materials under confinement, we developed a modified, thin-layer IMR approach for the accurate determination of high strain-rate viscoelastic material properties of soft solids that utilizes axisymmetric finite-element simulations of bubble dynamics in a thin layer. The approach is applied to two transparent, benchmark gels: 6% and 14% gelatin, and the material parameters estimated using the thin-layer IMR approach are validated against experimental data for isolated, spherical bubbles and oversized bubbles in a thin layer. The thin-layer IMR approach provides a robust methodology for applying IMR to nearly opaque, soft materials, such as tissues.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"79 ","pages":"Article 102378"},"PeriodicalIF":4.5,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144771012","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

Multiscale structure-mechanical property relationship and data-driven design of ultra-high temperature ceramics: A review 超高温陶瓷的多尺度结构-力学性能关系与数据驱动设计综述

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-07-24 DOI: 10.1016/j.eml.2025.102392

Xiaoqian Gao , Li Chen , Runkai Liu , Jing Wan , Huasong Qin , Yilun Liu

{"title":"Multiscale structure-mechanical property relationship and data-driven design of ultra-high temperature ceramics: A review","authors":"Xiaoqian Gao , Li Chen , Runkai Liu , Jing Wan , Huasong Qin , Yilun Liu","doi":"10.1016/j.eml.2025.102392","DOIUrl":"10.1016/j.eml.2025.102392","url":null,"abstract":"<div><div>Ultra-high temperature ceramics (UHTCs) exhibit exceptional melting points, superior oxidation resistance, and outstanding ablation performance, positioning them as indispensable materials for extreme-environment applications. However, their inherent brittleness, high density, limited elasticity, and poor fatigue resistance restrict broader implementation. This review presents a rigorous, multiscale examination of interrelationships between UHTC structural characteristics and mechanical behaviors, addressing critical knowledge gaps in failure mechanisms and state-of-the-art design of strengthening and toughening strategies. The analysis commences with crystal-chemical principles and progresses through salient microstructural and mesostructural characteristics, followed by an exploration of thermally induced deformation and structural evolution at elevated temperatures. The dominated factors in mechanical degradation and corresponding strengthening and toughening mechanisms across nanoscale, microscale, and mesoscale levels are systematically dissected. Furthermore, we highlight recent advances in high-throughput screening within materials genome engineering and the integration of machine learning (ML) for rapid property prediction and structural optimization of UHTCs. Finally, prospective multiscale design strategies are proposed to synergistically optimize the balance of strength and toughness in UHTCs.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"79 ","pages":"Article 102392"},"PeriodicalIF":4.3,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704219","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

Band gap analysis and prediction for phononic metamaterials with different spiral shapes based on transfer learning 基于迁移学习的不同螺旋形状声子超材料带隙分析与预测

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-07-22 DOI: 10.1016/j.eml.2025.102379

Majid Kheybari, Hongyi Xu

{"title":"Band gap analysis and prediction for phononic metamaterials with different spiral shapes based on transfer learning","authors":"Majid Kheybari, Hongyi Xu","doi":"10.1016/j.eml.2025.102379","DOIUrl":"10.1016/j.eml.2025.102379","url":null,"abstract":"<div><div>This study presents a comprehensive computational investigation of band gap characteristics in spiral-based phononic metamaterials, including Archimedean, Octagon, Hexagon, and Square spiral configurations. It offers a quantitative understanding of the similarities in Bloch wave properties across these spiral types and demonstrates the feasibility of using data from known spiral patterns to facilitate the property prediction of new types. Based on the spiral datasets that vary in the number of turns, cutting width, and inner radius, we observed strong correlations in band gap counts among patterns (e.g., Rotated Octagon and Octagon, Archimedean and Rotated Octagon), indicating similar behaviors in band gap occurrence across different geometries. It was also found that the rotation of geometric shapes had a minor impact on band gap counts. However, we observed that the distribution of band gap width varies significantly across different types of spirals, with weak correlations. Furthermore, we demonstrate that transfer learning (TL) enhances prediction accuracy for new spiral types compared to traditional neural network approaches. TL model demonstrated superior performance, effectively capturing complex band gap details and improving overall prediction accuracy, without requiring extensive training data.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"79 ","pages":"Article 102379"},"PeriodicalIF":4.3,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144703631","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