Extreme Mechanics Letters最新文献_第8页

Tailored multiscale instabilities in a grid metamaterial 网格超材料的定制多尺度不稳定性

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 轴向和周向形变三维弯曲超材料的静力和动力分析

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 声弹性超材料梁中弹性和声波的同时操纵

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 利用分散纤维衰竭模型预测主动脉组织双轴衰竭强度

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

A non-iterative numerical approach for visco-elasto-hydrodynamic lubrication problems 粘-弹-水动力润滑问题的非迭代数值方法

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

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

Do slip-weakening laws shapes influence rupture dynamics? 滑移弱化规律形状是否影响破裂动力学？

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/j.eml.2024.102272

Roxane Ferry, Jean-François Molinari

{"title":"Do slip-weakening laws shapes influence rupture dynamics?","authors":"Roxane Ferry, Jean-François Molinari","doi":"10.1016/j.eml.2024.102272","DOIUrl":"10.1016/j.eml.2024.102272","url":null,"abstract":"<div><div>To model rupture dynamics, a friction law must be assumed. Commonly used constitutive laws include slip-weakening laws which are characterized by a drop from static to dynamic frictional stress over a critical slip distance. Within this framework, the prevailing understanding asserts that the frictional behavior is solely controlled by the fracture energy — the area beneath the frictional stress versus the cumulative slip curve. In particular, it is claimed that the curve’s shape itself has no influence on the system’s response. Here we perform fully dynamic rupture simulations to challenge prevailing beliefs by demonstrating that the constitutive law shape exerts an intimate control over rupture dynamics. These results are confirmed using two independent numerical schemes (spectral boundary integral and finite element methods). For a consistent fracture energy but varying constitutive weakening law shapes, the slip velocity profile is different: each abrupt slope transition leads to the localization of a distinct velocity peak. For example, in the case of a bilinear slip-weakening law featuring two different slopes, the rupture exhibits two distinct velocity peaks. This phenomenon arises from the transition between a constant weakening rate to another. We show that ruptures with the same fracture energy but different constitutive law shapes may respond differently to stress barriers, especially when cumulative slip is below the critical slip <span><math><msub><mrow><mi>D</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>. In these cases, variations in effective fracture energy across different laws lead to differing outcomes: under one law, a rupture may propagate past a barrier, while under another, it may arrest. These findings underscore the critical role of constitutive law shape on rupture dynamics, influencing the response to small-scale asperities and heterogeneities and to larger-scale barriers, and highlighting the importance of both fracture energy and weakening mechanisms for seismic hazard assessment.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"74 ","pages":"Article 102272"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142520","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

Machine learning-aided prediction and customization on mechanical response and wave attenuation of multifunctional kiri/origami metamaterials 多功能kiri/折纸超材料力学响应和波衰减的机器学习辅助预测与定制

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/j.eml.2024.102276

Sihao Han, Chunlei Li, Qiang Han, Xiaohu Yao

{"title":"Machine learning-aided prediction and customization on mechanical response and wave attenuation of multifunctional kiri/origami metamaterials","authors":"Sihao Han, Chunlei Li, Qiang Han, Xiaohu Yao","doi":"10.1016/j.eml.2024.102276","DOIUrl":"10.1016/j.eml.2024.102276","url":null,"abstract":"<div><div>Multifunctional materials attract extensive attention for simultaneously satisfying diverse engineering applications, such as protection against mechanical and vibratory intrusions. Here, the mechanical responses and wave attenuation of multi-functional metamaterials at various elastoplastic are custom-designed. An elegant kiri/origami metamaterial is proposed, offering widely tunable mechanical responses and broadband wave attenuation in ultra low-frequencies. The incomparable compression-twist of kresling origami and the prominent local-resonance of kirigami split-rings promote efficient elastic wave polarization and plastic hinges, providing comprehensive protection from elastic to plastic. Kirigami split-rings highlight a fabrication-friendly approach of forming local resonators. Experiments and analyses confirm the reliability and superiority. Leveraging a machine learning-aided framework, optimal and anticipated individual properties and custom multi-performances are achieved for wave attenuation, energy absorption, plateau fluctuations, deformation triggering forces, and load-bearing/plateau forces under various impact levels. The machine learning-aided framework enables rapid multi-objective prediction and customization end-to-end without requiring prior knowledge. This work holds significant potential for the development and application of multi-functional, multi-physical field and multi-scale metamaterials.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"74 ","pages":"Article 102276"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143131","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

Crystal size effect on large deformation mechanisms of thermoplastic polyurethane 晶体尺寸对热塑性聚氨酯大变形机理的影响

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-01-01 DOI: 10.1016/j.eml.2024.102275

Zhaoxin Zhang, Shuze Zhu

{"title":"Crystal size effect on large deformation mechanisms of thermoplastic polyurethane","authors":"Zhaoxin Zhang, Shuze Zhu","doi":"10.1016/j.eml.2024.102275","DOIUrl":"10.1016/j.eml.2024.102275","url":null,"abstract":"<div><div>Thermoplastic polyurethane, a phase-separated polymer containing amorphous soft domains and crystal hard domains, is a widely used high-performance polymer. However, how the crystal size affects the mechanical properties of thermoplastic polyurethane remains unclear. In this work, molecular dynamics simulations are carried out to reveal the atomistic deformation mechanisms coupled to crystal sizes. The atomistic models contain finite crystal hard domains in a representative volume element with periodicity in three dimensions. With comprehensive analysis in tension, compression, and shear, we find that the crystal size affects the timing and difficulty of deconstruction and rotation in crystal hard domain, cavitation in amorphous soft domain, and therefore determine the structural strength at different deformation stages. For example, smaller crystal size renders higher yield strength yet lower ultimate tensile strength. The discovered crystal size effect allows us to envision a gradient nano-crystal thermoplastic polyurethane with its customizable yet exceptional mechanical properties. By engineering the spatial distribution of crystals with different sizes, the gradient nano-crystal thermoplastic polyurethane can be strong in tension, yet soft in compression. Our current work deepens the understanding of the deformation mechanisms of thermoplastic polyurethanes and provides insights into the rational design of block copolymer materials with desirable mechanical properties.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"74 ","pages":"Article 102275"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143134","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

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