http://yetl.yabesh.ir/yetl1/handle/yetl/19050 Fri, 05 Jun 2026 15:24:33 GMT 2026-06-05T15:24:33Z http://localhost:80/yetl1/bitstream/id/184252/ http://yetl.yabesh.ir/yetl1/handle/yetl/19050 http://yetl.yabesh.ir/yetl1/handle/yetl/4310625 Mechanical Properties Inside Origami-Inspired Structures: An Overview Yan, Peng; Huang, Hailin; Meloni, Marco; Li, Bing; Cai, Jianguo In recent decades, origami has transitioned from a traditional art form into a systematic field of scientific inquiry, characterized by attributes such as high foldability, lightweight frameworks, diverse deformation modes, and limited degrees-of-freedom. Despite the abundant literature on smart materials, actuation methods, design principles, and manufacturing techniques, comprehensive reviews focusing on the mechanical properties of origami-inspired structures are relatively rare and unsystematic. This review aims to fill this void by analyzing and summarizing the significant studies conducted on the mechanical properties of origami-inspired structures from 2013 to 2023. We begin with an overview that includes essential definitions of origami, classical origami patterns, and their associated tessellated or stacked structures. Following this, we delve into the principal dynamic modeling method for origami and conduct an in-depth analysis of the key mechanical properties of origami-inspired structures. These properties include tunable stiffness, bistability and multistability, metamechanical properties demonstrated by origami-based metamaterials, and bio-inspired mechanical properties. Finally, we conclude with a comprehensive summary that discusses the current challenges and future directions in the field of origami-inspired structures. Our review provides a thorough synthesis of both the mechanical properties and practical applications of origami-inspired structures, aiming to serve as a reference and stimulate further research. Mon, 01 Jan 2024 00:00:00 GMT http://yetl.yabesh.ir/yetl1/handle/yetl/4310625 2024-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4310409 Fracture Mechanics of Magnetoelectroelastic Materials and Structures: State of the Art and Prospects Feng, W. J.; Yan, Z.; Ma, P.; Lv, C. F.; Zhang, Ch. Magnetoelectroelastic (MEE) materials and structures have been extensively applied in MEE devices such as sensors and transducers, microelectromechanical systems, and smart structures. In order to assess the strength and durability of such materials and structures, exhaustive theoretical and numerical investigations have been conducted over the past two decades. The main purpose of this paper is to present a state-of-the-art review and a critical discussion on the research in the field of the MEE fracture mechanics. Following an introduction, the basic theory of the fracture mechanics in linear magnetoelectroelasticity is explained with special emphasis on the constitutive equations related to different fracture modes, magnetoelectric (ME) crack-face boundary conditions, and fracture parameters for two-dimensional (2D) plane problems. Then, the state of the art of the research on the fracture mechanics of the MEE materials and structures is reviewed and summarized, including 2D antiplane and in-plane as well as three-dimensional (3D) analyses under both static and dynamic loadings. The magnetoelectric effects on the fracture parameters are revealed and discussed. Moreover, numerical investigations based on the finite element method (FEM), boundary element method (BEM), meshless methods, and other novel methods are also reviewed for 2D plane and 3D fracture problems. Finally, some conclusions are drawn with several prospects to open questions and demanding future research topics. In particular, experimental observations are urgently needed to verify the validity of the theoretical predictions of the various fracture criteria. Another great challenge is to tackle the nonlinear phenomena and domain switching in the fracture process zone. Wed, 01 Jan 2025 00:00:00 GMT http://yetl.yabesh.ir/yetl1/handle/yetl/4310409 2025-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4310404 Reduced and All-At-Once Approaches for Model Calibration and Discovery in Computational Solid Mechanics Römer, Ulrich; Hartmann, Stefan; Tröger, Jendrik-Alexander; Anton, David; Wessels, Henning; Flaschel, Moritz; De Lorenzis, Laura In the framework of solid mechanics, the task of deriving material parameters from experimental data has recently reemerged with the progress in full-field measurement capabilities and the renewed advances of machine learning. In this context, new methods such as the virtual fields method and physics-informed neural networks have been developed as alternatives to the already established least-squares and finite element-based approaches. Moreover, model discovery problems are emerging and can be addressed in a parameter estimation framework. These developments call for a new unified perspective, which is able to cover both traditional parameter estimation methods and novel approaches in which the state variables or the model structure itself are inferred as well. Adopting concepts discussed in the inverse problems community, we distinguish between all-at-once and reduced approaches. With this general framework, we are able to structure a large portion of the literature on parameter estimation in computational mechanics—and we can identify combinations that have not yet been addressed, two of which are proposed in this paper. We also discuss statistical approaches to quantify the uncertainty related to the estimated parameters, and we propose a novel two-step procedure for identification of complex material models based on both frequentist and Bayesian principles. Finally, we illustrate and compare several of the aforementioned methods with mechanical benchmarks based on synthetic and experimental data. Wed, 01 Jan 2025 00:00:00 GMT http://yetl.yabesh.ir/yetl1/handle/yetl/4310404 2025-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4310296 Mechanics and Dynamics of Organic Mixed Ionic-Electronic Conductors Wang, Xiaokang; Yang, Xixian; Mei, Jianguo; Zhao, Kejie Organic mixed ionic-electronic conductors (OMIECs) are a class of materials that can transport ionic and electronic charge carriers simultaneously. They have shown broad applications in soft robotics, electrochemical transistors, and bio-electronics. The structural response of OMIECs to the mixed conduction populates from molecular conformation to devices, presenting challenges in understanding their mechanical behavior and constitutive descriptions. Furthermore, OMIECs feature strong multiphysics interactions among mechanics, electrostatics, charge conduction, mass transport, and microstructural evolution. In this review, we summarize recent progress in mechanistic understanding of OMIECs and highlight dynamics and heterogeneity underlying each element of mechanics. We introduce strain activation and breathing, mechanical properties, and degradation of OMIECs upon electrochemical doping and dedoping. Drawing on the state-of-the-art experimental and simulation insights, we highlight the critical role of multiscale dynamics in governing the functionality of OMIECs. We discuss the current understanding and limitation of constitutive relations and present computational frameworks that integrate multiphysics. We synthesize mechanics-driven strategies—spanning strain modulation, material stretchability, and interfacial stability—from molecular design to macroscopic structural engineering. We conclude with our perspective on the outstanding questions and key challenges for continued research. This review aims to organize the fundamental mechanical principles of OMIECs, offering a multidisciplinary framework for researchers to identify, analyze, and address mechanical challenges in mixed conducting polymers and their applications. Wed, 01 Jan 2025 00:00:00 GMT http://yetl.yabesh.ir/yetl1/handle/yetl/4310296 2025-01-01T00:00:00Z