Extreme Mechanics Letters最新文献_第7页

Piezoelectric gauge transformation for inverse design of polar Willis transducers 极性Willis换能器反设计的压电表变换

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-03-22 DOI: 10.1016/j.eml.2025.102315

Li Huang , Rui Zhu , Gengkai Hu , Yangyang Chen

{"title":"Piezoelectric gauge transformation for inverse design of polar Willis transducers","authors":"Li Huang , Rui Zhu , Gengkai Hu , Yangyang Chen","doi":"10.1016/j.eml.2025.102315","DOIUrl":"10.1016/j.eml.2025.102315","url":null,"abstract":"<div><div>Piezoelectric lattices with delicately designed microscopic geometry are powerful building blocks to construct integrated sensors and actuators with versatile, yet unconventional, responses absent from bulk materials. However, the inverse design of the microscopic geometry to achieve a sought-after electromechanical response remains elusive. Here, we suggest an analytical approach, called <em>piezoelectric gauge transformation</em>, to design piezoelectric lattice transducers that can deform to an arbitrary desired displacement field when a voltage is applied. We first develop continuum piezoelectric gauge transformation and find that the transformed piezoelectric material displays piezoelectric polarity and Willis coupling in the sense that the applied electric field generates asymmetric stress and body force, and both rigid body rotation and translation induce electric charges. To design this polar and Willis-type piezoelectric material, we develop discrete piezoelectric gauge transformation and propose feasible lattice design guidelines. Numerical simulations are performed to validate the piezoelectric gauge transformation and demonstrate a range of appealing displacement control functions. The study presents a complete theoretical framework for the inverse design of lattice transducers to achieve arbitrary desired actuated displacement fields, beneficial to the development of soft actuators, robotics, and other piezoelectric devices.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"77 ","pages":"Article 102315"},"PeriodicalIF":4.3,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697878","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

Mechanical strength across metastatic lesions in trabecular bone: The interplay of microstructure and composition 骨小梁转移病灶的机械强度：微观结构和组成的相互作用

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-03-19 DOI: 10.1016/j.eml.2025.102317

Hanwen Fan , Hutomo Tanoto , Po-Ting Lin , Flordeliz Bowles , Shu Zhang , Zhonglin Liu , Feng Li , Eric O. Klineberg , Yuxiao Zhou

{"title":"Mechanical strength across metastatic lesions in trabecular bone: The interplay of microstructure and composition","authors":"Hanwen Fan , Hutomo Tanoto , Po-Ting Lin , Flordeliz Bowles , Shu Zhang , Zhonglin Liu , Feng Li , Eric O. Klineberg , Yuxiao Zhou","doi":"10.1016/j.eml.2025.102317","DOIUrl":"10.1016/j.eml.2025.102317","url":null,"abstract":"<div><div>Pathological bone fractures are a prevalent complication associated with metastatic cancer. However, the fragility associated with bone metastasis exhibits distinct characteristics that are not adequately addressed by current fracture risk assessment systems, which are primarily designed for osteoporosis. To understand how metastasis impairs trabecular bone strength, we experimentally measured mechanical strain across osteolytic and osteoblastic metastatic lesions under axial compression using mechanical testing coupled with micro-computed tomography (micro-CT) and digital volume correlation (DVC) method. We then attempted to evaluate the correlation between this mechanical strain and various parameters, including bone microstructure, bone mineral density, and bone fat-water concentration with the presence of trabecular bone, as assessed through high-resolution micro-CT and magnetic resonance imaging (MRI). This proof-of-concept study demonstrates a workflow that integrates mechanical testing and medical imaging data, enabling the potential to develop a quantitative correlation between local bone strength and the microstructural and compositional parameters measurable through medical imaging techniques. This innovative approach is helpful for identifying key factors influencing mechanical strength of metastatic bones and provides valuable insights for the development of new fracture risk assessment protocols for cancer patients.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"76 ","pages":"Article 102317"},"PeriodicalIF":4.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684644","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

Collision resistant study of spherical tensegrity structures for protective drone shells 无人机防护弹球形张拉整体结构抗碰撞研究

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-03-13 DOI: 10.1016/j.eml.2025.102312

Yaoyao Zhang , Kexin Zheng , Yi Zhao , Zhiyuan Zheng , Bingxing Chen , Muhao Chen

引用次数: 0

Modeling and control of coupled soft viscoelastic actuators based on sparse identification method 基于稀疏辨识方法的耦合软粘弹性作动器建模与控制

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-03-12 DOI: 10.1016/j.eml.2025.102309

Jisen Li , Anjing Cheng , Hao Wang, Zhipeng Xu, Jian Zhu

{"title":"Modeling and control of coupled soft viscoelastic actuators based on sparse identification method","authors":"Jisen Li , Anjing Cheng , Hao Wang, Zhipeng Xu, Jian Zhu","doi":"10.1016/j.eml.2025.102309","DOIUrl":"10.1016/j.eml.2025.102309","url":null,"abstract":"<div><div>Dielectric elastomer actuators (DEAs) are extensively employed as artificial muscles in bioinspired soft robotics due to their large voltage-induced deformations and muscle-like characteristics. Achieving complex, multiple degree of freedom(DOF) motions often requires coupling multiple DEAs. However, modeling and controlling coupled DEAs pose significant challenges due to their inherently nonlinear response, driven by factors such as rate-dependent viscoelasticity, design irregularities, and complex interactions among adjacent actuators. This study presents a comprehensive framework for the modeling and control of multiple coupled DEAs, leveraging a sparse identification approach to derive explicit governing equations that effectively describe the viscoelastic and coupling effects from experimental data. Using these identified equations, we design a model predictive controller (MPC) that enables precise trajectory tracking across a range of motion profiles. The proposed framework is validated through tracking experiments on DEAs with two DOFs, demonstrating its effectiveness and robustness. This approach offers a novel pathway for uncovering the underlying physics of coupled DEAs, with the potential to enhance the functional capabilities of DEA-driven soft robotic systems.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"76 ","pages":"Article 102309"},"PeriodicalIF":4.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641786","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

DNN-based inverse design of line heating patterns for automated plate forming in shipbuilding using multi-start convex optimization 基于dnn的船舶板件自动成形线加热模式多启动凸优化反设计

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-03-06 DOI: 10.1016/j.eml.2025.102313

Hyeonbin Moon , Kundo Park , Jaemin Lee , Donggi Lee , Seunghwa Ryu

{"title":"DNN-based inverse design of line heating patterns for automated plate forming in shipbuilding using multi-start convex optimization","authors":"Hyeonbin Moon , Kundo Park , Jaemin Lee , Donggi Lee , Seunghwa Ryu","doi":"10.1016/j.eml.2025.102313","DOIUrl":"10.1016/j.eml.2025.102313","url":null,"abstract":"<div><div>Line heating is a widely used plate forming technique in the shipbuilding industry, where steel plates are heated along specified paths to achieve desired deformations. Traditionally, the design of these heating patterns relies on the expertise of skilled workers due to the complex and nonlinear relationship between the heating patterns and the resultant plate deformations. This reliance often results in inconsistent productivity and quality. This study presents a data-driven inverse design framework that automates the optimization of line heating patterns for specified plate deformations, addressing the need for rapid and systematic methodologies. A deep neural network (DNN) trained on finite element method (FEM) simulation data, which validated against experimental results, is employed to model the relationship between initial plate geometry, line heating patterns, and resultant deformations. This surrogate model enables rapid predictions of deformed plate shapes. Utilizing the trained DNN, a multi-start convex optimization process is employed to identify the optimal line heating patterns for any given initial plate geometry and desired deformation. The proposed framework demonstrates significant potential for various engineering inverse design applications requiring prompt and accurate results, as validated by designing line heating patterns for 800 different plate shapes, achieving desired deformations not included in the training data.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"76 ","pages":"Article 102313"},"PeriodicalIF":4.3,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620403","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

Tiny scale defect contour recognition on curved structure based on electromagnetic thermography 基于电磁热成像的曲面结构微小缺陷轮廓识别

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-03-03 DOI: 10.1016/j.eml.2025.102311

Lihua Guo , Wei Guo , Ling He , Liming Chen , Yue Li , Shunping Yan , Qiang Wan , Shejuan Xie , Zhenmao Chen

{"title":"Tiny scale defect contour recognition on curved structure based on electromagnetic thermography","authors":"Lihua Guo , Wei Guo , Ling He , Liming Chen , Yue Li , Shunping Yan , Qiang Wan , Shejuan Xie , Zhenmao Chen","doi":"10.1016/j.eml.2025.102311","DOIUrl":"10.1016/j.eml.2025.102311","url":null,"abstract":"<div><div>Precision spherical pressure vessels are used in critical pressure-bearing structures due to their excellent structural strength. The surface of the spherical shell may experience corrosion in long-term service, leading to the formation of tiny pitting defects, which cause a risk to the structural integrity. A high-precision, non-destructive method is required for tiny defects detecting and contour recognition. In this paper, firstly, a new sensor consisting of a rotatable yoke and spherical adaptive flexible material with high permeability (FMHP) is designed to improve the performance of the electromagnetic thermography, which achieves the detection of tiny scale defects in spherical shell surface with diameter of 40μm. Secondly, super-resolution algorithms based on machine learning and deep learning are developed to realize the contour recognition of tiny defects, indicating that the generative adversarial network has an optimum performance. Then, to address the distortion phenomenon in infrared imaging of spherical structures, a coordinate transformation-based image correction algorithm is developed, enabling the accurate reconstruction of defect contours.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"76 ","pages":"Article 102311"},"PeriodicalIF":4.3,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600934","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 : 2025-03-01 DOI: 10.1016/S2352-4316(25)00018-5

引用次数: 0

A unified phonon-softening-based model to uncover processing history dependent strain hardening in metallic solids 基于声子软化的统一模型揭示金属固体中与加工历史相关的应变硬化

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-02-28 DOI: 10.1016/j.eml.2025.102310

Jinguo Lin , Li Yu , Cen Chen , Tzu-Chiang Wang , Feng Liu

{"title":"A unified phonon-softening-based model to uncover processing history dependent strain hardening in metallic solids","authors":"Jinguo Lin , Li Yu , Cen Chen , Tzu-Chiang Wang , Feng Liu","doi":"10.1016/j.eml.2025.102310","DOIUrl":"10.1016/j.eml.2025.102310","url":null,"abstract":"<div><div>Recent years, microstructures are taken advantage to promote the improvement of both strength and ductility in metallic solids, or in other words to tailor the strain hardening behavior. Despite complicacy of microstructures, following the same processing protocol, it could guide as-cast samples all the way to the target structure and properties, which suggests that establishing a processing history dependent strain hardening model could be a way out for a better behavior description or even performance prediction. Based on a nonlinear transformation to strain, the common regularity of the processing history influence to metallic solids’ strain hardening behavior is uncovered, which helps us to model the processing history dependent strain hardening and its validity is confirmed by comparing with eighteen experimental data sets (66 stress-strain curves). Our theoretical model enables quantitatively describing the processing history dependence of strain hardening and even could be possibly used to characterize processing methods, which may provide insights into the strategy of evading strength–ductility trade-off.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"76 ","pages":"Article 102310"},"PeriodicalIF":4.3,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562486","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

Structural effects of ply-level imperfections and extreme temperatures on bistable ultra-thin composite booms 胶层缺陷和极端温度对双稳态超薄复合材料臂的结构影响

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-02-27 DOI: 10.1016/j.eml.2025.102305

Chloé Zarader, Xin Ning

{"title":"Structural effects of ply-level imperfections and extreme temperatures on bistable ultra-thin composite booms","authors":"Chloé Zarader, Xin Ning","doi":"10.1016/j.eml.2025.102305","DOIUrl":"10.1016/j.eml.2025.102305","url":null,"abstract":"<div><div>Bistable ultra-thin composite booms capable of self-deploying from coiled stable configuration to extended shape offer significant potential for lightweight deployable space structures. This paper explores the effects of ply-level thickness and angle defects on the bistable behavior of ultra-thin composite booms with circular cross-sections made from carbon fiber-reinforced epoxy (CF-Epoxy) and glass fiber-reinforced polypropylene (GF-PP) laminates. The results show that the curvatures and coiling angles are more sensitive to ply angle defects than to ply thickness imperfections. This work investigates the influence of uniform temperature variations on the bistability of the booms and the shapes of stable equilibrium states. The results suggest that the CF-Epoxy boom can maintain bistability with a wide range of temperatures, but the GF-PP boom would lose bistability in typical temperatures in space. The temperature variations have stronger effects on the coiled stable state than the extended stable shape. Furthermore, the paper investigates the combined effects of imperfections and temperature variations on the CF-Epoxy boom. Ply-level imperfections generally intensify the effects of temperature variations on the curvatures and angles of the stable states. Combined with temperature variations, ply angle imperfections still have greater effect on the curvatures than ply thickness imperfections.</div></div>","PeriodicalId":56247,"journal":{"name":"Extreme Mechanics Letters","volume":"76 ","pages":"Article 102305"},"PeriodicalIF":4.3,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548388","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

Artificial sunflower: Light-induced deformation of photoactive shells 人造向日葵：光活性壳的光致变形

IF 4.3 3区工程技术

Extreme Mechanics Letters Pub Date : 2025-02-27 DOI: 10.1016/j.eml.2025.102302

Sathvik Sanagala, Kaushik Bhattacharya

引用次数: 0