Acta Mechanica Solida Sinica最新文献_第3页

Effect of Hydrogen on the Transformation Ratcheting of NiTi SMA Wires: Experiment and Modeling 氢对NiTi SMA丝相变棘轮的影响：实验与模型

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-10-14 DOI: 10.1007/s10338-024-00529-w

Han M. Jiang, Wenxiang Shi, Chao Yu, Guozheng Kang

{"title":"Effect of Hydrogen on the Transformation Ratcheting of NiTi SMA Wires: Experiment and Modeling","authors":"Han M. Jiang, Wenxiang Shi, Chao Yu, Guozheng Kang","doi":"10.1007/s10338-024-00529-w","DOIUrl":"10.1007/s10338-024-00529-w","url":null,"abstract":"<div><p>This paper investigates the effect of hydrogen on the transformation ratcheting of NiTi shape memory alloy (SMA) wires in the experimental and theoretical aspects. In the aspect of experiments, the NiTi SMA orthodontic wires are hydrogen charged by the electrochemical charging method at room temperature with varying charging durations and charging lengths. After that, the <i>ex-situ</i> cyclic tension-unloading experiments are performed for the charged and non-charged wires. Experimental results reveal that the two transformation platforms (two-step MT) occur during the forward MT at the beginning and end of cyclic deformation for hydrogen-charged wires, which can be regarded as a global response of the non-charged and charged regions. Furthermore, this two-step MT and transformation ratcheting aggravate with the increase of the charging duration. In the aspect of the theoretical model, a diffusional-mechanically coupled constitutive model is developed. In this constitutive model, the strain is considered as four components: elasticity, transformation (MT), hydrogen expansion and transformation-induced plasticity (TRIP). Combining Helmholtz free energy and Clausius–Duhem inequality, the thermodynamic driving forces of MT and TRIP are obtained. Fick’s law and the mass conservation equation are incorporated to derive the evolution of hydrogen concentration. A transition from material points to the whole wire is employed to extend the model from a material point to the entire wire, and the overall response with a heterogeneous hydrogen concentration field is obtained. The proposed model's ability to predict the transformation ratcheting of the non-charged and charged NiTi SMA wires is verified by contrasting predictions and experimental results.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"38 1","pages":"33 - 44"},"PeriodicalIF":2.0,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431019","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

Indentation of a Plate on a Thin Transversely Isotropic Elastic Layer 横向各向同性弹性薄层上板的压痕

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-10-07 DOI: 10.1007/s10338-024-00532-1

Juyao Li, Guozheng Zhang, Liu Wang, Zhaohe Dai

{"title":"Indentation of a Plate on a Thin Transversely Isotropic Elastic Layer","authors":"Juyao Li, Guozheng Zhang, Liu Wang, Zhaohe Dai","doi":"10.1007/s10338-024-00532-1","DOIUrl":"10.1007/s10338-024-00532-1","url":null,"abstract":"<div><p>This work investigates the indentation response of an elastic plate resting upon a thin, transversely isotropic elastic layer supported by a rigid substrate. Such a scenario is encountered across a range of length scales from piezoresistive tests on graphite nanoflakes to the bending of floating ice shelves atop seabed, where the elastic layer commonly exhibits certain anisotropy. We first develop an approximate model to describe the elastic response of a transversely isotropic layer by exploiting the slenderness of the layer. We show that this approximate model can be reduced to the classic compressible Winkler foundation model as the elastic constants of the layer are set isotropic. We then investigate the combined response of an elastic plate on the transversely isotropic elastic layer. Facilitated by the simplicity of our proposed approximate model, we can derive simple analytical solutions for the cases of small and large indenter radii. The analytical results agree well with numerical calculations obtained via finite element methods, as long as the system is sufficiently slender in a mechanical sense. These results offer quantitative insights into the mechanical behavior of numerous semiconductor materials characterized by transverse isotropy and employed with slender geometries in various practical applications where the thin layer works as conductive and functional layers.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"38 2","pages":"331 - 340"},"PeriodicalIF":2.0,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786485","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

Effect of Core Structure on the Mechanical and Electromagnetic Properties of High-Temperature Superconducting Cables 芯结构对高温超导电缆力学和电磁性能的影响

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-10-07 DOI: 10.1007/s10338-024-00527-y

Jiangtao Yan, Yuanwen Gao

{"title":"Effect of Core Structure on the Mechanical and Electromagnetic Properties of High-Temperature Superconducting Cables","authors":"Jiangtao Yan, Yuanwen Gao","doi":"10.1007/s10338-024-00527-y","DOIUrl":"10.1007/s10338-024-00527-y","url":null,"abstract":"<div><p>Research on the mechanical–electrical properties is crucial for designing and preparing high-temperature superconducting (HTS) cables. Various winding core structures can influence the mechanical–electrical behavior of cables, but the impact of alterations in the winding core structure on the mechanical–electrical behavior of superconducting cables remains unclear. This paper presents a 3D finite element model to predict the performance of three cables with different core structures when subjected to transverse compression and axial tension. The three cables analyzed are CORC (conductor-on-round-core), CORT (conductor-on-round-tube), and HFRC (conductor-on-spiral-tube). A parametric analysis is carried out by varying the core diameter and inner-to-outer diameter ratio. Results indicate that the CORT cable demonstrates better performance in transverse compression compared to the CORC cable, aligning with experimental data. Among the three cables, the HFRC cables exhibit the weakest resistance to transverse deformation. However, the HFRC cable demonstrates superior tensile deformation resistance compared to the CORT cable, provided that the transverse compression properties are maintained. Finite element results also show that the optimum inner-to-outer diameter ratios for achieving the best transverse compression performance are approximately 0.8 for CORT cables and 0.6 for HFRC cables. Meanwhile, the study explores the effect of structural changes in HTS cable winding cores on their electromagnetic properties. It recommends utilizing small tape gaps, lower frequencies, and spiral core construction to minimize eddy losses. The findings presented in this paper offer valuable insights for the commercialization and practical manufacturing of HTS cables.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"38 1","pages":"14 - 24"},"PeriodicalIF":2.0,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430978","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

Three-Dimensional Phase-Field Simulation of Stress-Assisted Two-Way Shape Memory Effect and Its Cyclic Degradation of Single-Crystal NiTi Shape Memory Alloy 单晶NiTi形状记忆合金应力辅助双向形状记忆效应及其循环退化的三维相场模拟

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-09-25 DOI: 10.1007/s10338-024-00504-5

Bo Xu, Chao Yu, Chong Wang, Qingyuan Wang, Guozheng Kang

{"title":"Three-Dimensional Phase-Field Simulation of Stress-Assisted Two-Way Shape Memory Effect and Its Cyclic Degradation of Single-Crystal NiTi Shape Memory Alloy","authors":"Bo Xu, Chao Yu, Chong Wang, Qingyuan Wang, Guozheng Kang","doi":"10.1007/s10338-024-00504-5","DOIUrl":"10.1007/s10338-024-00504-5","url":null,"abstract":"<div><p>In this work, a three-dimensional crystal-plasticity-based phase-field model considering three kinds of inelastic deformation mechanisms, i.e., martensitic transformation, dislocation slip in austenite, and dislocation slip in martensite, is established to simulate the stress-assisted two-way shape memory effect (SATWSME) of NiTi single crystals and its cyclic degradation. The simulation results show that the ability of the SATWSME of NiTi single crystal increases as increasing the constant stress in the range discussed in this work (10–100 MPa), which is due to the increase of reoriented martensite formed in the cooling process due to the enhanced variant-selection capability of increased constant stress. The martensitic transformation and its reverse in the cyclic process reflecting the SATWSME show more and more obvious localization characteristics, resulting in the accumulation of significantly heterogeneous plastic deformation (mainly caused by the dislocation slip in austenite), which leads to the cyclic degradation of SATWSME. The simulation results and the conclusions drawn from this work are helpful for further understanding the mechanism of functional cyclic degradation of NiTi alloys.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"37 6","pages":"858 - 872"},"PeriodicalIF":2.0,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142811263","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

Coupling Effects and Resonant Characteristics of Rotating Composite Thin-Walled Beams in Hygrothermal Environments 湿热环境中旋转复合薄壁梁的耦合效应和共振特性

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-09-19 DOI: 10.1007/s10338-024-00516-1

Ling Yuan, Liang Li, Weidong Zhu, Long Wang, Xiaoyu Lu, Yinghui Li

引用次数: 0

Nonlinear Bending of FG-CNTR Curved Nanobeams in Thermal Environments 热环境中 FG-CNTR 弯曲纳米梁的非线性弯曲

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-09-09 DOI: 10.1007/s10338-024-00524-1

Yuanyuan Zhang, Yanxin Li, Guoyong Zhang, Xin Zhang

{"title":"Nonlinear Bending of FG-CNTR Curved Nanobeams in Thermal Environments","authors":"Yuanyuan Zhang, Yanxin Li, Guoyong Zhang, Xin Zhang","doi":"10.1007/s10338-024-00524-1","DOIUrl":"10.1007/s10338-024-00524-1","url":null,"abstract":"<div><p>By focusing on the nonlinear bending behavior of functionally graded carbon nanotube-reinforced (FG-CNTR) curved nanobeams under thermal loads while considering size effects, this paper fills the apparent void by comprehensively incorporating the Chen-Yao surface elasticity theory and modified couple-stress theory. A tri-parameter elastic substrate model is introduced, and the temperature dependence of material properties is considered. Through a two-step perturbation technique, the asymptotic solutions for the temperature-deflection relationship are obtained. After that, novel numerical results are provided to explore the impacts of temperature, size effects, geometric characteristics of the curved beams, elastic substrates, properties of the CNT reinforcements, and boundary conditions. The results indicate that surface effects, couple stress effects, and the elastic foundation enhance the bending stiffness of FG-CNTR curved nanobeams. By considering both size effect theories, this study provides a more comprehensive and precise description of the nonlinear bending of FG-CNTR curved nanobeams under thermal loads.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"38 1","pages":"166 - 180"},"PeriodicalIF":2.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175077","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

Coupled Solutions for Two-Dimensional Decagonal Piezoelectric Quasicrystals with Cracks 有裂缝的二维十边形压电准晶体的耦合解

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-09-06 DOI: 10.1007/s10338-024-00517-0

Xiang Mu, Zhaowei Zhu, Liangliang Zhang, Yang Gao

引用次数: 0

Deep-Learning-Coupled Numerical Optimization Method for Designing Geometric Structure and Insertion-Withdrawal Force of Press-Fit Connector 设计压入式连接器几何结构和插拔力的深度学习耦合数值优化方法

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-08-30 DOI: 10.1007/s10338-024-00521-4

Mingzhi Wang, Bingyu Hou, Weidong Wang

{"title":"Deep-Learning-Coupled Numerical Optimization Method for Designing Geometric Structure and Insertion-Withdrawal Force of Press-Fit Connector","authors":"Mingzhi Wang, Bingyu Hou, Weidong Wang","doi":"10.1007/s10338-024-00521-4","DOIUrl":"10.1007/s10338-024-00521-4","url":null,"abstract":"<div><p>The press-fit connector is a typical plug-and-play solderless connection, and it is widely used in signal transmission in fields such as communication and automotive devices. This paper focuses on inverse designing and optimization of geometric structure, as well as insertion-withdrawal forces of press-fit connector using artificial neural network (ANN)-assisted optimization method. The ANN model is established to approximate the relationship between geometric parameters and insertion-withdrawal forces, of which hyper-parameters of neural network are optimized to improve model performance. Two numerical methods are proposed for inverse designing structural parameters (Model-I) and multi-objective optimization of insertion-withdrawal forces (Model-II) of press-fit connector. In Model-I, a method for inverse designing structure parameters is established, of which an ANN model is coupled with single-objective optimization algorithm. The objective function is established, the inverse problem is solved, and effectiveness is verified. In Model-II, a multi-objective optimization method is proposed, of which an ANN model is coupled with genetic algorithm. The Pareto solution sets of insertion-withdrawal forces are obtained, and results are analyzed. The established ANN-coupled numerical optimization methods are beneficial for improving the design efficiency, and enhancing the connection reliability of the press-fit connector.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"38 1","pages":"78 - 90"},"PeriodicalIF":2.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175079","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

Size-Dependent Analysis of Strain Energy Release Rate of Buckling Delamination Based on the Modified Couple Stress Theory 基于修正耦合应力理论的屈曲分层应变能释放率尺寸依赖性分析

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-08-29 DOI: 10.1007/s10338-024-00520-5

Siyu He, Feixiang Tang, Xiuming Liu, Zhongjie Gao, Fang Dong, Sheng Liu

{"title":"Size-Dependent Analysis of Strain Energy Release Rate of Buckling Delamination Based on the Modified Couple Stress Theory","authors":"Siyu He, Feixiang Tang, Xiuming Liu, Zhongjie Gao, Fang Dong, Sheng Liu","doi":"10.1007/s10338-024-00520-5","DOIUrl":"10.1007/s10338-024-00520-5","url":null,"abstract":"<div><p>In micro-electro-mechanical systems, interface expansion issues are commonly encountered, and due to their small size, they often exist at the micro- or nano-scale. The influence of the micro-structural effect on interface mechanics cannot be ignored. This paper focuses on studying the impact of micro-structural effect on interface crack propagation. Modified couple stress theory (MCST) is used to study the buckling delamination of ultra-thin film-substrate systems. The equivalent elastic modulus (EEM) and equivalent flexural rigidity (EFR) are derived based on MCST. Substituting EEM and EFR into the classical Kirchhoff plate theory, the governing equations of ultra-thin film-substrate system with micro-structural effect can be obtained. The finite element method (FEM) was used to calculate the critical strain energy release rate for crack extension. Differences between the three theoretical approaches of MCST, classical theory (CT), and FEM were compared. The effects of stress ratio <span>(frac{sigma }{{sigma_{c} }})</span>, initial crack length, film thickness, and micro-structural effect parameters on crack extension were analyzed. The results show that the FEM calculations coincide with the CT calculations. The stress ratio <span>(frac{sigma }{{sigma_{c} }})</span>, initial crack length, film thickness, and micro-structural effect parameters have significantly influence crack extension.</p></div>","PeriodicalId":50892,"journal":{"name":"Acta Mechanica Solida Sinica","volume":"37 6","pages":"989 - 1002"},"PeriodicalIF":2.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175080","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 of Sandwich MRE Resonator and Band Gap Adjustment of Metamaterial Beam 三明治 MRE 谐振器建模与超材料光束带隙调整

IF 2 3区工程技术

Acta Mechanica Solida Sinica Pub Date : 2024-08-28 DOI: 10.1007/s10338-024-00500-9

Zhihong Gao, Xueyi Zhang, Yu Xue, Jinhui Liu, Jinqiang Li, Zhiguang Song

引用次数: 0