Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 528

年份

2024 47

2023 66

2022 55

2021 48

2020 42

2019 28

2018 28

2017 23

2016 19

2015 22

2014 15

2013 21

2012 10

2011 14

2010 9

2009 22

2008 17

2007 17

2006 1

2005 2

展开︾

关键词

增材制造 3

4D打印 2

二氧化碳 2

压力容器技术 2

固体氧化物燃料电池 2

复合材料 2

带传动 2

形状记忆聚合物 2

显微硬度 2

有色金属工业 2

离子液体 2

重金属 2

重金属废水 2

2035 1

Al@AP/PVDF纳米复合材料 1

BMI树脂 1

Deep metal mining 1

EDI 1

Mitigation 1

展开︾

检索范围：

排序：展示方式：

Fabrication of ionic polymer-metal composites (IPMCs) and robot design

Hanmin PENG, Qingjun Ding, Huafeng LI

《机械工程前沿（英文）》 2009年第4卷第3期页码 332-338 doi: 10.1007/s11465-009-0046-5

摘要： This paper describes a method for preliminary manufacturing experiments on a type of smart materials—ionic polymer-metal composites (IPMCs). They belong to EAP materials and are famous for their capability of huge displacement within a low voltage (1–3 V). With best operation quality in the humid environment, they can be made as underwater robots in simple structures. In this paper, two purposes are embodied. One focuses on the research on the IPMCs characteristics, including the actuating principle, manufacturing process, and parameters of performance. The other is that a relevant robot driven by IPMCs strips is designed. According to imitation propulsion mechanism of undulatory fins, IPMCs are designed for a novel bionic water vehicle propelled by undulatory multiple fish-like fins (made by IPMCs). The robot consists of three fins on the bottom tightly contacting by plastic foils with each other.

关键词： ionic polymer-metal composites (IPMCs) artificial muscles actuator bionic robot platinum-plated

HTML PDF 收藏

Performance of ionic polymer-metal composite (IPMC) with different surface roughening methods

Ning JIN, Bangfeng WANG, Kan BIAN, Qi CHEN, Ke XIONG,

《机械工程前沿（英文）》 2009年第4卷第4期页码 430-435 doi: 10.1007/s11465-009-0053-6

摘要： Based on permeation and double chemical reduction technology, this paper researches the manufacture of Pt-ionic polymer metal composites (IPMC) and the effect of three types of surface roughening methods on the manufacture and performance of IPMC. The roughening methods include manual polishing, sanding machine polishing, and plasma surface treatment. The appearance and scanning electron microscopy (SEM) features, electro-active deformation and surface resistance characteristics of these IPMC specimens were obtained and compared through specimen tests. The results of the tests indicate that surface roughening technology obviously influences the performance of IPMC. The uniformity and compactness of the metal deposited on the surface and inside the Nafion film are improved by improving surface roughening uniformity. However, the electro-active deformation capability and surface resistance of the specimens decrease at the same time. There is an approximate linear increase relationship between the driving voltage and the bending deformation of the IPMC specimen within a certain voltage range. Under the same specimen dimension, constraints, and driving voltage (3V), the maximum electro-active bending deformation angles of the specimens are about 60°, 45°, and 15° for manual polishing, sanding machine roughening, and plasma treatment, respectively.

关键词： ionic polymer metal composites (IPMC) surface roughening scanning electron microscopy (SEM) analyze actuator electroless plating

HTML PDF 收藏

Preparation and performance of soft actuator based on IPMC with silver electrodes

Qi CHEN, Ke XIONG, Kan BIAN, Ning JIN, Bangfeng WANG,

《机械工程前沿（英文）》 2009年第4卷第4期页码 436-440 doi: 10.1007/s11465-009-0054-5

摘要： The surface electrodes of traditional ionic polymer-metal composites (IPMC) are made of platinum. To reduce the production cost, nonprecious metals such as silver is proposed. A new approach of electroless silver plating based on chemical deposition method is adopted, getting two types of IPMCs, Pt-Ag IPMC, and Ag-Ag IPMC. The microscopic analysis, driving abilities tests, and their surface-electrode resistance analysis show that Ag and Pt particles penetrate inside Nafion membrane with gradient distribution throughout the membrane. The maximum electro-active bending deformation angles of the specimens, which are obtained under the same specimen dimension and constrains, are about 60° for Pt-Pt IPMC and Pt-Ag IPMC and 90° for the Ag-Ag IPMC, respectively, corresponding to the driving voltage of 3 V, 4 V, and 1.5 V. The surface-electrode resistance of Ag-Ag IPMC is the lowest and the most stable, which shows that the proposed approach is valid. The experiments show that the IPMC technology based on the silver electrode is feasible.

关键词： ionic polymer-metal composites (IPMC) Nafion intelligent material soft actuators electroless silver plating

HTML PDF 收藏

IPMC gripper static analysis based on finite element analysis

Hanmin PENG, Yao HUI, Qingjun DING, Huafeng LI, Chunsheng ZHAO,

《机械工程前沿（英文）》 2010年第5卷第2期页码 204-211 doi: 10.1007/s11465-010-0005-1

摘要： Recently, a type of flexible grippers with low power supply (0–5 V) has been designed and developed for grasping small but precision parts. In previous work, the authors manufactured a soft gripper whose actuating components are made of ionic polymer-metal composite (IPMC) materials; however, there is not a comprehensive model to analyze the complete mechanics for this IPMC gripper. Therefore, this paper provides a finite element method for analyzing its static mechanics characteristics in the state with maximal stress and strain (i.e., the gripper opening largest, including the IPMC deformation, stress, and strain). Further, these electromechanical coupling relationships can be simulated by using the piezoelectric analysis module based on ANSYS software. The simulation results show that the maximal tip displacement of IPMC strips can nearly reach their own free length, the maximal stress is 54 MPa in the center of copper electrodes, and the maximal strain is 0.0286 on the IPMC strip. The results provide detailed numerical solutions and appropriate finite element analysis methodologies beneficial for further research on the optimization design, forecast analysis, and control field.

关键词： ionic polymer-metal composite (IPMC) artificial muscles actuator flexible gripper finite element analysis electromechanical coupling

HTML PDF 收藏

Numerical modeling of nonlinear deformation of polymer composites based on hyperelastic constitutive

Qingsheng YANG, Fang XU

《机械工程前沿（英文）》 2009年第4卷第3期页码 284-288 doi: 10.1007/s11465-009-0067-0

摘要： Fiber reinforced polymer (FRP) composites exhibit nonlinear and hyperelastic characteristics under finite deformation. This paper investigates the macroscopic hyperelastic behavior of fiber reinforced polymer composites using a micromechanical model and finite deformation theory based on the hyperelastic constitutive law. The local stress and deformation of a representative volume element are calculated by the nonlinear finite element method. Then, an averaging procedure is used to find the homogenized stress and strain, and the macroscopic stress-strain curves are obtained. Numerical examples are given to demonstrate hyperelastic behavior and deformation of the composites, and the effects of the distribution pattern of fibers are also investigated to model the mechanical behavior of FRP composites.

关键词： composites hyperelastic finite deformation homogenization micromechanics

HTML PDF 收藏

Fracture model for the prediction of the electrical percolation threshold in CNTs/Polymer composites

Yang SHEN, Pengfei HE, Xiaoying ZHUANG

《结构与土木工程前沿（英文）》 2018年第12卷第1期页码 125-136 doi: 10.1007/s11709-017-0396-8

摘要： In this paper, we propose a 3D stochastic model to predict the percolation threshold and the effective electric conductivity of CNTs/Polymer composites. We consider the tunneling effect in our model so that the unrealistic interpenetration can be avoided in the identification of the conductive paths between the CNTs inside the polymer. The results are shown to be in good agreement with reported experimental data.

关键词： electrical percolation CNTs/Polymer composites fracture model electric conductivity tunnelling effects

HTML PDF 收藏

Tribological study on the surface modification of metal-on-polymer bioimplants

《机械工程前沿（英文）》 2022年第17卷第2期 doi: 10.1007/s11465-022-0682-6

摘要： The tribological performance of artificial joints is regarded as the main factor of the lifespan of implanted prostheses. The relationship between surface roughness and coefficient of friction (COF) under dry and lubricated conditions is studied. Results show that under dry test, friction coefficient is not reduced all the time with a decrease in surface roughness. On the contrary, a threshold of roughness value is observed, and frictional force increases again below this value. This critical value lies between 40 and 100 nm in S_a (roughness). This phenomenon is due to the transfer of friction mechanisms from abrasion to adhesion. Under wet test, COF always decreases with reduction in surface roughness. This result is mainly attributed to the existence of a thin layer of lubricant film that prevents the intimate contact of two articulating surfaces, thus greatly alleviating adhesion friction. Furthermore, surface texturing technology is successful in improving the corresponding tribological performance by decreasing friction force and mitigating surface deterioration. The even-distribution mode of texturing patterns is most suitable for artificial joints. By obtaining the optimal surface roughness and applying texturing technology, the tribological performance of polymer-based bioimplants can be greatly enhanced.

关键词： artificial joints surface roughness friction surface texturing

HTML PDF 收藏

Hierarchical porous metal-organic frameworks/polymer microparticles for enhanced catalytic degradation

《化学科学与工程前沿（英文）》 2022年第16卷第6期页码 939-949 doi: 10.1007/s11705-022-2152-4

摘要： This work reports on a simple microfluidic strategy to controllably fabricate uniform polymeric microparticles containing hierarchical porous structures integrated with highly accessible catalytic metal organic frameworks for efficient degradation of organic contaminants. Monodisperse (W1/O)/W2 emulsion droplets generated from microfluidics are used as templates for the microparticle synthesis. The emulsion droplets contain tiny water microdroplets from homogenization and water nanodroplets from diffusion-induced swollen micelles as the dual pore-forming templates, and Fe-based metal-organic framework nanorods as the nanocatalysts. The obtained microparticles possess interconnected hierarchical porous structures decorated with highly accessible Fe-based metal-organic framework nanorods for enhanced degradation of organic contaminants via a heterogeneous Fenton-like reaction. Such a degradation performance is highlighted by using these microparticles for efficient degradation of rhodamine B in hydrogen peroxide solution. This work provides a simple and general strategy to flexibly combine hierarchical porous structures and catalytic metal-organic frameworks to engineer advanced microparticles for water decontamination.

关键词： metal-organic framework polymer microparticle nanocatalyst decontamination organic contaminant

HTML PDF 收藏

我国高性能高分子复合材料发展现状与展望

曹维宇,杨学萍,张藕生

《中国工程科学》 2020年第22卷第5期页码 112-120 doi: 10.15302/J-SSCAE-2020.05.010

摘要：

高性能高分子复合材料因其优异的综合性能，成为国防与国民经济建设不可或缺的战略性关键材料，已在航空、航天、风力发电、轨道交通、汽车等领域进行应用，发展前景广阔。本文分析了我国发展高性能高分子复合材料的宏观需求，综述了高性能高分子复合材料中碳纤维、芳纶、高性能玻璃纤维等纤维增强体以及复合材料用高分子树脂基体如环氧树脂、酚醛树脂、特种树脂的发展现状及特点，研判了高性能高分子复合材料发展存在的问题以及今后发展的目标与任务。研究发现，碳纤维领域初步形成了从关键技术研发到工程化生产的产业化体系，材料向高性能和低成本双向发展；对位芳纶产业化初步成功；玻璃纤维则保持低速扩张；高性能高分子复合材料树脂基体产业则面临严峻的发展形势。基于发展需求，从注重自主创新、坚持需求牵引、重视产业链建设、加强人才培养与支持产业创新建设等方面提出了发展建议，以期为我国高性能高分子复合材料的发展提供参考借鉴。

关键词：高性能纤维高分子树脂基体复合材料

HTML PDF 收藏

装备升级换代背景下金属基复合材料的发展机遇和挑战

武高辉,匡泽洋

《中国工程科学》 2020年第22卷第2期页码 79-90 doi: 10.15302/J-SSCAE-2020.02.012

摘要：

本文从产业化发展战略的角度出发，对我国金属基复合材料的形成和发展进行了评述。简要总结了我国金属基复合材料的发展历程，梳理了当前快速发展阶段中金属基复合材料在几个主要制备方法，如原位自生法、搅拌铸造法、粉末冶金法、压力浸渗法中取得的关键性技术突破。在此基础上，列举了对装备升级换代产生显著推动作用、具有代表性的金属基复合材料工程应用案例，预测了未来5~10年金属基复合材料的发展趋势。针对当前国防与国民经济领域装备技术发展对材料技术提出的挑战，分析了金属基复合材料在军民两用市场的发展机遇与前景，同时就产业化技术和产业环境的不足，从夯实国家级产业化平台和壮大人才培养基地、加大国家投入、加快标准和数据库体系建设、开发低成本高品质材料制备技术4个方面提出了发展建议。

关键词：金属基复合材料产业化应用装备发展材料制备

HTML PDF 收藏

Controllable construction of ionic frameworks for multi-site synergetic enhancement of CO₂

Yuke Zhang;Hongxue Xu;Haonan Wu;Lijuan Shi;Jiancheng Wang;Qun Yi

《化学科学与工程前沿（英文）》 2024年第18卷第1期页码 4-4 doi: 10.1007/s11705-023-2370-4

摘要： CO₂ capture is one of the key technologies for dealing with the global warming and implementing low-carbon development strategy. The emergence of ionic metal-organic frameworks (I-MOFs) has diversified the field of porous materials, which have been extensively applied for gas adsorption and separation. In this work, amino-functionalized imidazolium ionic liquid as organic monodentate ligand was used for one step synthesis microporous Cu based I-MOFs. Precise tuning of the adsorption properties was obtained by incorporating aromatic anions, such as phenoxy, benzene carboxyl, and benzene sulfonic acid group into the I-MOFs via a facile ion exchange method. The new I-MOFs showed high thermal stability and high capacity of 5.4 mmol·g^–1 under atmospheric conditions for selective adsorption of CO₂. The active sites of microporous Cu-MOF are the ion basic center and unsaturated metal, and electrostatic attraction and hydroxyl bonding between CO₂ and modified functional sulfonic groups are responsible for the adsorption. This work provides a feasible strategy for the design of I-MOF for functional gas capture.

关键词： carbon dioxide capture micropores ionic liquids multi-site synergism ionic metal-organic frameworks

HTML PDF 收藏

离子液体在金属离子萃取中的研究进展

刘利梅,苏永庆,李琮,贺飞,何永福,钟云

《中国工程科学》 2007年第9卷第11期页码 187-190

摘要：

介绍了离子液体的定义，发展历史，性质等，重点阐述用于金属离子萃取的离子液体的性质、合成方法和发展方向。

关键词：离子液体萃取金属离子绿色溶剂

HTML PDF 收藏

An improved design method to predict the E-modulus and strength of FRP composites at different temperatures

Mohammed FARUQI, Gobishanker RAJASKANTHAN, Breanna BAILEY, Francisco AGUINIGA

《结构与土木工程前沿（英文）》 2022年第16卷第12期页码 1653-1653 doi: 10.1007/s11709-019-0578-7

摘要： In recent years, there has been an increased interest in the use of fiber reinforced polymer (FRP) in the construction industry. However, the E-modulus and strength of such members at high service temperatures is still unknown. Modulus and strength of FRP at high service temperatures are highly required parameters for full design. The knowledge and application of this could lead to a cost effective and practical consideration in fire safety design. Thus, this paper proposes design methods for calculating the E-modulus and strength of FRP members at different temperatures. Experimental data from literature were normalized and compared with the results predicted by this method. It was found that the proposed design methods conservatively estimate the E-modulus and strength of FRP structural members. In addition, comparison was also made with direct references to the real behavior of materials. It was found to be satisfactory. Finally, an application is provided.

关键词： concrete fiber reinforced polymer E-modulus strength temperatures

HTML PDF 收藏

Nexus between polymer support and metal oxide nanoparticles in hybrid nanosorbent materials (HNMs) for

Ryan C. SMITH,Jinze LI,Surapol PADUNGTHON,Arup K. SENGUPTA

《环境科学与工程前沿（英文）》 2015年第9卷第5期页码 929-938 doi: 10.1007/s11783-015-0795-9

摘要： Metal oxide nanoparticles like hydrated ferric oxide (HFO) or hydrated zirconium oxide (HZrO) are excellent sorbents for environmentally significant ligands like phosphate, arsenic, or fluoride, present at trace concentrations. Since the sorption capacity is surface dependent for HFO and HZrO, nanoscale sizes offer significant enhancement in performance. However, due to their miniscule sizes, low attrition resistance, and poor durability they are unable to be used in typical plug-flow column setups. Meanwhile ion exchange resins, which have no specific affinity toward anionic ligands, are durable and chemically stable. By impregnating metal oxide nanoparticles inside a polymer support, with or without functional groups, a hybrid nanosorbent material (HNM) can be prepared. A HNM is durable, mechanically strong, and chemically stable. The functional groups of the polymeric support will affect the overall removal efficiency of the ligands exerted by the Donnan Membrane Effect. For example, the removal of arsenic by HFO or the removal of fluoride by HZrO is enhanced by using anion exchange resins. The HNM can be precisely tuned to remove one type of contaminant over another type. Also, the physical morphology of the support material, spherical bead versus ion exchange fiber, has a significant effect on kinetics of sorption and desorption. HNMs also possess dual sorption sites and are capable of removing multiple contaminants, namely, arsenate and perchlorate, concurrently.

关键词： ion exchange sorption arsenic perchlorate fluoride

HTML PDF 收藏

structural engineering applications, recent trends, research and developments on pultruded fiber reinforced polymer

Alfred Kofi GAND, Tak-Ming CHAN, James Toby MOTTRAM

《结构与土木工程前沿（英文）》 2013年第7卷第3期页码 227-244 doi: 10.1007/s11709-013-0216-8

摘要： The objectives of this study are to review and evaluate the developments and applications of pultruded fiber-reinforced polymer composites in civil and structural engineering and review advances in research and developments. Several case applications are reviewed. The paper presents a state-of-the-art review of fundamental research on the behavior of pultruded fiber reinforced polymer closed sections and highlights gaps in knowledge and areas of potential further research.

关键词： fibre reinforced polymer composites behaviour of FRPs tubular sections pultruded FRP tubular profiles FRP tubes in bridges applications of pultruded FRP tubes new-build with FRP tubes