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Multi-layer structure formation of relativistic electron beams in plasmas
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作者 Xiaojuan WANG Zhanghu HU Younian WANG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第2期10-16,共7页
A two-dimensional electromagnetic particle-in-cell simulation model is proposed to study the density evolution and collective stopping of electron beams in background plasmas.We show here the formation of the multi-la... A two-dimensional electromagnetic particle-in-cell simulation model is proposed to study the density evolution and collective stopping of electron beams in background plasmas.We show here the formation of the multi-layer structure of the relativistic electron beam in the plasma due to the different betatron frequency from the beam front to the beam tail.Meanwhile,the nonuniformity of the longitudinal wakefield is the essential reason for the multi-layer structure formation in beam phase space.The influences of beam parameters(beam radius and transverse density profile)on the formation of the multi-layer structure and collective stopping in background plasmas are also considered. 展开更多
关键词 multi-layer structure beam phase space relativistic electron beam plasma based beam dump PIC
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Micrometer-sized ferrosilicon composites wrapped with multi-layered carbon nanosheets as industrialized anodes for high energy lithium-ion batteries 被引量:2
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作者 Meng Li Jingyi Qiu +6 位作者 Songtong Zhang Pengcheng Zhao Zhaoqing Jin Anbang Wang Yue Wang Yusheng Yang Hai Ming 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第11期286-295,共10页
Various nanostructured architectures have been demonstrated to be effective to address the issues of high capacity Si anodes. However, the scale-up of these nano-Si materials is still a critical obstacle for commercia... Various nanostructured architectures have been demonstrated to be effective to address the issues of high capacity Si anodes. However, the scale-up of these nano-Si materials is still a critical obstacle for commercialization. Herein, we use industrial ferrosilicon as low-cost Si source and introduce a facile and scalable method to fabricate a micrometer-sized ferrosilicon/C composite anode, in which ferrosilicon microparticles are wrapped with multi-layered carbon nanosheets. The multi-layered carbon nanosheets could effectively buffer the volume variation of Si as well as create an abundant and reliable conductivity framework, ensuring fast transport of electrons. As a result, the micrometer-sized ferrosilicon/C anode achieves a stable cycling with 805.9 m Ah g-1 over 200 cycles at 500 mA g-1 and a good rate capability of455.6 mAh g-1 at 10 A g-1. Therefore, our approach based on ferrosilicon provides a new opportunity in fabricating cost-effective, pollution-free, and large-scale Si electrode materials for high energy lithium-ion batteries. 展开更多
关键词 FERROSILICON multi-layered carbon nanosheets Micrometer-sized Si Material structural design Anode Lithium-ion batteries
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Defect feature recognition method of glass fibre-reinforced structure based on visual image analysis 被引量:1
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作者 HUANG Jingde 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2022年第1期61-67,共7页
Glass fibre-reinforced(GFR)structure is extensively used in radome,spoiler and some other equipment.In engineering practice,due to the influence of wear,aging,impact,chemical corrosion of surface structure and other f... Glass fibre-reinforced(GFR)structure is extensively used in radome,spoiler and some other equipment.In engineering practice,due to the influence of wear,aging,impact,chemical corrosion of surface structure and other factors,the internal structure of this kind of structure gradually evolves into a defect state and expands to form defects such as bubbles,scratches,shorts,cracks,cavitation erosion,stains and other defects.These defects have posed a serious threat to the quality and performance of GFR structure.From the propagation process of GFR structure defects,its duration is random and may be very short.Therefore,designing a scientific micro defect intelligent detection system for GFR structure to enhance the maintainability of GFR structure will not only help to reduce emergencies,but also have positive theoretical significance and application value to ensure safe production and operation.Firstly,the defect detection mechanism of GFR structure is discussed,and the defect detection principle and defect area identification method are analyzed.Secondly,the processing process of defect edge signal is discussed,a classifier based on MLP is established,and the algorithm of the classifier is designed.Finally,the effectiveness of this method is proved by real-time monitoring and defect diagnosis of a typical GFR structure.The experimental results show that this method improves the efficiency of defect detection and has high defect feature recognition accuracy,which provides a new idea for the on-line detection of GFR structure defects. 展开更多
关键词 glass fibre-reinforced(GFR)structure multi-layer perceptron(MLP) machine vision defect detection
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Influencing factors on elastic-plastic deformation of multi-layered surfaces under sliding contact
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作者 YAN Li PAN Xin-xiang XU Jiu-jun CHENG Dong 《中国有色金属学会会刊:英文版》 CSCD 2004年第z1期472-477,共6页
Stress distribution in the gradient multi-layered surface under a sliding contact was investigated using finite element method(FEM). The main structure parameters of layered surface discussed are total layer thickness... Stress distribution in the gradient multi-layered surface under a sliding contact was investigated using finite element method(FEM). The main structure parameters of layered surface discussed are total layer thickness,layer number and elastic modulus ratio of layer to the substrate. A model of multi-layered surface contact with rough slider was studied. The effect of the surface structure parameters on the elastic-plastic deformation was analyzed. 展开更多
关键词 GRADIENT multi-layered SURFACE ELASTIC-PLASTIC DEFORMATION SURFACE structure PARAMETER FEM
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A simple model for approximate bandgap structure calculation of all-solid photonic bandgap fibre based on an array of rings
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作者 方宏 娄淑琴 +3 位作者 郭铁英 姚磊 李宏雷 简水生 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第1期232-237,共6页
A simple model for approximate bandgap structure calculation of all-solid photonic bandgap fibre based on an array of rings is proposed. In this model calculated are only the potential modes of a unit cell, which is a... A simple model for approximate bandgap structure calculation of all-solid photonic bandgap fibre based on an array of rings is proposed. In this model calculated are only the potential modes of a unit cell, which is a high-index ring in the low-index background for this fibre, rather than the whole cladding periodic structure based on Bloch's theorem to find the bandgap. Its accuracy is proved by comparing its results with the results obtained by using the accurate full-vector plane-wave method. High speed in computation is its great advantage over the other exact methods, because it only needs to find the roots of one-dimensional analytical expressions. And the results of this model, mode plots, offer an ideal environment to explore the basic properties of photonie bandgap clearly. 展开更多
关键词 photonic bandgap fibre bandgap structure multi-layer waveguide plane-wave method
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Structural Traps in Detachment Folds:a Case Study from the 'Comband Trough-like' Deformation Zone/s,East Sichuan,China 被引量:3
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作者 WANG Zongxiu ZHANG Jin +5 位作者 LI Tao ZHOU Xingui MA Zongjin TANG Liangjie XIAO Weifeng YAN Xili 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2012年第4期828-841,共14页
Detachment structures occur widely in the crust, and it is the commonest and most important deformation type developed in the region between orogenic belts and basins. The 'comb-like' and 'toughlike' fold belts in... Detachment structures occur widely in the crust, and it is the commonest and most important deformation type developed in the region between orogenic belts and basins. The 'comb-like' and 'toughlike' fold belts in eastern Sichuan are caused by multi-layer detachment. The duplex structure is the most important deformation style in the region, exhibiting different characteristics from typical detachment structures. Different deformation styles, scales, and shortenings resulting from independent deformations of various detachment systems would lead to the phenomenon whereby most of the topographical heights in the region do not correspond to the structural heights in depth. Based on systematic structural analysis and combined with practical oil/gas prospecting, four types of structural traps are described from eastern Sichuan Province, which are: detachment and thrust trap; detachment folding trap; fault-flat blocking trap; and detachment layer trap. Meticulous studies on the deformation and distribution of detachment layers in the eastern Sichuan Province will contribute to oil/gas prospecting and selection of potential regions of marine-origin oil/gas prospecting in South China. 展开更多
关键词 multi-layer detachment DEFORMATION detachment and thrust structural trap Sichuan province.
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Anisotropy of multi-layered structure with sliding and bonded interlayer conditions
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作者 Lingyun YOU Kezhen YAN +1 位作者 Jianhong MAN Nengyuan LIU 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2020年第3期632-645,共14页
A better understanding of the mechanical behavior of the multilayered structure under extermal loading is the most important item for the structural design and the risk asssment.The objective of this study are to prop... A better understanding of the mechanical behavior of the multilayered structure under extermal loading is the most important item for the structural design and the risk asssment.The objective of this study are to propose and develop an analytical solution for the mechanical behaviors of multi-layered structure generated by axisy mmetric loading,and to investigate the impact of anisotropic layers and interlayer conditions on the multi-layered structure.To reach these objectives,first,according to the goveming equations,the analytical solution for a single layer was formulated by adopting the spatial Hankel transform.Then the global matrix technique is applied to achieve the analytical solution of multi-layered structure in Hankel domain.The sliding and bonded interlayer conditions were considered in this process.Finally,the numerical inversion of integral transform was used to solve the components of displacement and stress in real domain.Gauss-Lcgendre quadrature is a key scheme in the numerical inversion process.Moreover,following by the verification of the proposed analytical solution,one typical three-layered flexible pavement was applied as the computing carrier of numerical analysis for the multi-layered structure.The results have shown that the anisotropic layers and the interlayer conditions significantly affect the mechanical behaviors of the proposed structure. 展开更多
关键词 multi-layered structure Hankel transformation anisotropic transversely isotropic interlayer condition Gauss-Legendre quadrature
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基于结构光的铆钉凹凸量双目视觉检测方法
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作者 余厚云 孙建阳 +4 位作者 孙艺洪 付攀 温亚鑫 单英轩 程雅妮 《航空制造技术》 CSCD 北大核心 2024年第6期34-41,共8页
为了弥补飞机铆钉凹凸量的传统检测方式在精度、效率及稳定性方面的不足,提出了一种基于结构光的铆钉凹凸量双目视觉检测方法。首先通过工业投影仪将结构光投射到铆接表面,由双目相机采集投影图像。然后根据铆钉边缘特征提取出铆接区域... 为了弥补飞机铆钉凹凸量的传统检测方式在精度、效率及稳定性方面的不足,提出了一种基于结构光的铆钉凹凸量双目视觉检测方法。首先通过工业投影仪将结构光投射到铆接表面,由双目相机采集投影图像。然后根据铆钉边缘特征提取出铆接区域,并采用改进的格雷码解相位方法计算铆接区域表面的相位信息。根据相位信息匹配特征点,利用视差原理计算出点云。最后通过点云数据处理,计算出铆钉的凹凸量。制作标准件并完成了凹凸量测量试验,测量误差在±20μm以内,重复测量标准差小于3μm,单个铆钉测量用时约2.2 s,能够满足现场测量精度和效率要求。 展开更多
关键词 飞机蒙皮 铆钉凹凸量 结构光 视觉测量 三维点云
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飞机多层金属铆接结构缺陷检测的新型电涡流探头仿真设计 被引量:2
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作者 徐昊 包俊 +2 位作者 黄国勇 邓为权 赵成俊 《电子测量与仪器学报》 CSCD 北大核心 2024年第5期178-187,共10页
飞机多层金属铆接结构随着飞机服役时间的增加,并伴随极端服役环境,有可能出现疲劳裂纹等缺陷,及时发现缺陷并获取缺陷深度、方向等信息对损伤评估与维修具有重要意义。然而,由于多层结构带来的缺陷隐蔽性,导致常规电涡流探头检测信号... 飞机多层金属铆接结构随着飞机服役时间的增加,并伴随极端服役环境,有可能出现疲劳裂纹等缺陷,及时发现缺陷并获取缺陷深度、方向等信息对损伤评估与维修具有重要意义。然而,由于多层结构带来的缺陷隐蔽性,导致常规电涡流探头检测信号特征不明显,且常规电涡流探头对某些方向缺陷不敏感,难以判断疲劳裂纹走向。针对上述问题,设计了一种十字跑道型差分式涡流探头,主要由一个十字跑道型激励线圈和两组差分检测线圈组成。通过建立飞机多层金属铆接结构缺陷检测的三维有限元模型研究新型涡流探头的可行性,包括对探头的结构进行了优化,分别对缺陷的不同方向、埋深和提离高度进行了仿真计算。结果表明,新型探头能够有效检测埋深6 mm、尺寸为10 mm×1 mm×1 mm的深层缺陷,并且能够获取缺陷的方向信息。相较传统探头,设计探头具有非敏感方向不漏检、抗提离效应、分辨力高等优势,研究结果可对飞机多层金属铆接结构检测的电涡流探头设计提供一定的参考。 展开更多
关键词 多层金属 铆接结构 电涡流检测 缺陷方向 差分结构
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含裂纹铆钉搭接板的权函数法与扩展寿命分析
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作者 任彦伸 饶聃钰 徐武 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 2024年第4期53-60,共8页
铆钉搭接结构是典型的多位置损伤敏感结构,容易在多个铆钉孔边萌生疲劳裂纹,进而威胁飞机结构安全。由于裂纹个数、位置和大小随机多变,铆钉与平板间存在复杂的接触关系。为高效、准确计算多铆钉搭接板的应力强度因子以进行裂纹扩展寿... 铆钉搭接结构是典型的多位置损伤敏感结构,容易在多个铆钉孔边萌生疲劳裂纹,进而威胁飞机结构安全。由于裂纹个数、位置和大小随机多变,铆钉与平板间存在复杂的接触关系。为高效、准确计算多铆钉搭接板的应力强度因子以进行裂纹扩展寿命分析,提出针对搭接结构复杂裂纹问题的权函数分析方法。首先,对多铆钉搭接板的复杂裂纹构型进行合理简化分类,利用其对应的权函数求解应力强度因子。然后,采用有限元分析计算含裂纹多铆钉搭接板的应力强度因子以验证权函数法的计算精度。最后,将经验证的权函数分析方法结合Paris裂纹扩展公式,对铆钉搭接结构进行疲劳裂纹扩展分析,并通过试验验证分析方法的有效性。结果表明,采用权函数法计算的应力强度因子与完全采用有限元方法计算的应力强度因子的相对差别小于5%,分析预测的裂纹扩展寿命与试验结果吻合良好,且计算效率比完全采用有限元法快3个数量级,进而为铆钉连接结构孔边裂纹的应力强度因子和疲劳裂纹扩展分析提供了一个有效方法。 展开更多
关键词 权函数法 铆钉连接结构 疲劳裂纹扩展 应力强度因子 有限元分析
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Synergistically biomimetic platform that enables droplets to be self-propelled
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作者 Minghao Li Yao Lu +2 位作者 Yujie Wang Shuai Huang Kai Feng 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2024年第5期272-283,共12页
Droplet transport still faces numerous challenges,such as a limited transport distance,large volume loss,and liquid contamination.Inspired by the principle of‘synergistic biomimetics’,we propose a design for a platf... Droplet transport still faces numerous challenges,such as a limited transport distance,large volume loss,and liquid contamination.Inspired by the principle of‘synergistic biomimetics’,we propose a design for a platform that enables droplets to be self-propelled.The orchid leaf-like three-dimensional driving structure provides driving forces for the liquid droplets,whereas the lotus leaf-like superhydrophobic surface prevents liquid adhesion,and the bamboo-like nodes enable long-distance transport.During droplet transport,no external energy input is required,no fluid adhesion or residue is induced,and no contamination or mass loss of the fluid is caused.We explore the influence of various types and parameters of wedge structures on droplet transportation,the deceleration of droplet speed at nodal points,and the distribution of internal pressure.The results indicate that the transport platform exhibits insensitivity to pH value and temperature.It allows droplets to be transported with varying curvatures in a spatial environment,making it applicable in tasks like target collection,as well as load,fused,anti-gravity,and long-distance transport.The maximum droplet transport speed reached(58±5)mm·s^(−1),whereas the transport distance extended to(136±4)mm.The developed platform holds significant application prospects in the fields of biomedicine and chemistry,such as high-throughput screening of drugs,genomic bioanalysis,microfluidic chip technology for drug delivery,and analysis of biological samples. 展开更多
关键词 synergistic biomimetics superhydrophobic surface multi-layer wedge-angle structure droplet transport
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有限元分析在含锰金属蒙皮铆接结构疲劳断裂性能中的研究 被引量:1
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作者 夏毅锐 苏洪波 王紫潇 《中国锰业》 2024年第2期79-83,95,共6页
随着计算机网络技术的迅速发展,有限元分析技术被广泛应用于铆接技术当中,在机械连接结构设计中起到了重要作用。为提高有限元分析法在求解含锰金属蒙皮铆接结构中断裂参数的精度,在有限元分析法中引入插值函数,推导出有限元分析模型,... 随着计算机网络技术的迅速发展,有限元分析技术被广泛应用于铆接技术当中,在机械连接结构设计中起到了重要作用。为提高有限元分析法在求解含锰金属蒙皮铆接结构中断裂参数的精度,在有限元分析法中引入插值函数,推导出有限元分析模型,并对模型进行仿真验证。结果显示,受应力作用在x方向和y方向上分别产生0.02 mm和0.006 mm的位移,应力主要集中在铆钉与蒙皮的连接处,孔周会产生先下陷再上翘的内翘情况。上下壁板可承受最大应力SVM1和SVM2分别增加了63 MPa和61 MPa,在受到外加荷载的情况下裂纹会先出现在下壁板与铆钉结构的连接处。综合应力随着裂纹长度的增大而减小,起始应力值271 MPa为铆钉材料拉伸强度的83.4%,铆接结构疲劳断裂的扩展应力较小、铆钉材料综合起始应力较大。以上结果显示,基于有限元分析在含锰金属蒙皮铆接结构疲劳断裂性能中的研究,对铆接结构断裂研究领域具有一定的参考意义。 展开更多
关键词 有限元分析 铆接结构 疲劳断裂 含锰金属蒙皮 断裂参数
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钢铝混合铆接漏斗车铆钉建模方法研究
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作者 杨洪波 付茂海 +1 位作者 夏康星 刘元鹏 《机械工程与自动化》 2024年第6期99-101,共3页
利用Hypermesh软件和ANSYS软件对钢铝混合铆接结构进行联合仿真,通过对比分析MPC接触算法和梁单元模拟两种方法与实体建模方法之间结果的差异,寻找较为准确模拟铆钉结构的有限元分析方法。研究结果表明:在三种铆接连接中铆钉常见受力工... 利用Hypermesh软件和ANSYS软件对钢铝混合铆接结构进行联合仿真,通过对比分析MPC接触算法和梁单元模拟两种方法与实体建模方法之间结果的差异,寻找较为准确模拟铆钉结构的有限元分析方法。研究结果表明:在三种铆接连接中铆钉常见受力工况下,和实体单元模型相比,梁单元模型最小误差为2.44%,MPC接触算法模型最小误差为6.46%。因此按照梁单元模型模拟铆钉更为贴近实际情况,同时能够节省大量计算时间,提高计算效率。 展开更多
关键词 钢铝混合铆接结构 铆钉 剪切拉伸 有限元法
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A Comprehensive Review on Multi-Dimensional Heat Conduction of Multi-Layer and Composite Structures:Analytical Solutions 被引量:1
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作者 AMIRI DELOUEI Amin EMAMIAN Amin +5 位作者 SAJJADI Hasan ATASHAFROOZ Meysam LI Yueming WANG Lian-Ping JING Dengwei XIE Gongnan 《Journal of Thermal Science》 SCIE EI CAS CSCD 2021年第6期1875-1907,共33页
Heat conduction in multi-layer and composite materials is one of the fundamental heat transfer problems in many industrial applications.Due to different materials types,interface conditions,and various geometries of t... Heat conduction in multi-layer and composite materials is one of the fundamental heat transfer problems in many industrial applications.Due to different materials types,interface conditions,and various geometries of these laminates,the heat conduction mechanism is more complicated than that of one-layer isotropic media.Analytical solutions are the best ways to study and understand such problems in depth.In this study,different existing analytical solutions for heat conduction in multi-layer and composite materials are reviewed and classified in rectangular,cylindrical,spherical,and conical coordinates.Applied boundary conditions,internal heat source,and thermal contact resistance as the most critical parameters in the solution complexity investigated in the literature,are discussed and summarized in different tables.Various types of multi-layer structures such as isotropic,anisotropic,orthotropic,and reinforced laminates are included in this study.It is found that although more than half a century has passed since the beginning of the research on heat transfer in multi-layer composites,new researches that can help with a better understanding in this area are still being offered.The challenges and shortcomings in this area are also discussed to guide future researches. 展开更多
关键词 multi-dimensional heat conduction composite laminates multi-layer structures analytical solutions interface contact resistance
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基于ANSYS Workbench的铆接工装设计与仿真
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作者 刘庆龙 魏永合 +1 位作者 李朋飞 李巍 《一重技术》 2024年第5期4-8,21,共6页
针对柔性连接器铆接手工压铆效率低、质量差的问题,设计一款半自动铆接工装用于柔性连接器的定位装夹装置。结合手工压铆过程提出铆接工装整体设计方案,用ANSYS Workbench进行强度校核和结构优化。新工装提高柔性连接器生产效率,降低铆... 针对柔性连接器铆接手工压铆效率低、质量差的问题,设计一款半自动铆接工装用于柔性连接器的定位装夹装置。结合手工压铆过程提出铆接工装整体设计方案,用ANSYS Workbench进行强度校核和结构优化。新工装提高柔性连接器生产效率,降低铆接废品率和危险性。 展开更多
关键词 压铆 结构优化 柔性连接器 航空工业 工装设计
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SiC_(f)/SiC铆钉连接结构双剪性能及失效机理
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作者 汪文君 腾雪峰 +4 位作者 梁成瑜 罗潇 李坚 刘小冲 胡晓安 《失效分析与预防》 2024年第5期327-336,共10页
陶瓷基复合材料(CMC)的连接结构设计与强度考核是实现其在航空发动机高温承载部件应用的关键。针对SiC_(f)/SiC陶瓷铆钉连接结构首次开展了陶瓷铆钉在室温、1300℃高温空气环境下的双剪力学性能试验和失效破坏分析,验证了SiC_(f)/SiC铆... 陶瓷基复合材料(CMC)的连接结构设计与强度考核是实现其在航空发动机高温承载部件应用的关键。针对SiC_(f)/SiC陶瓷铆钉连接结构首次开展了陶瓷铆钉在室温、1300℃高温空气环境下的双剪力学性能试验和失效破坏分析,验证了SiC_(f)/SiC铆钉应用于CMC构件连接的可行性。结果表明:高温环境下的SiC_(f)/SiC力学性能有一定程度的退化,与室温相比,高温环境下的陶瓷铆钉剪切刚度、剪切强度有明显降低。SiC_(f)/SiC具有良好的抗高温氧化能力,在陶瓷铆钉断口及内部未发现氧化特征,SiC_(f)/SiC铆钉在剪切载荷下发生脆性断裂,SiC纤维断口为解理面断裂,表现为明显的镜面、台阶、羽状特征,并且高温环境下的台阶、羽状断口特征更为凸显。CMC铆钉的承载能力受宏观承载方向与细观纤维铺层方向夹角的影响:当承载方向与铺层方向一致时,CMC铆钉具有较高的剪切刚度;随着夹角由0°增加到90°,CMC铆钉的剪切刚度逐渐降低。 展开更多
关键词 SiC_(f)/SiC 铆钉连接结构 双剪性能 失效机理 高温
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航天锥形件半自动化电磁铆枪研制及试验验证
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作者 党成龙 张铭豪 《制造技术与机床》 北大核心 2024年第3期102-107,共6页
针对航天锥形筒状结构件典型的铆接特点,文章提出了用半自动化电磁铆接技术实现其高质量、长寿命连接的方案;设计了包括轴线调整机构、缓冲机构、导向机构和刹车机构的半自动化电磁铆枪系统;完成了电磁铆接后坐力测算试验,分析了电磁铆... 针对航天锥形筒状结构件典型的铆接特点,文章提出了用半自动化电磁铆接技术实现其高质量、长寿命连接的方案;设计了包括轴线调整机构、缓冲机构、导向机构和刹车机构的半自动化电磁铆枪系统;完成了电磁铆接后坐力测算试验,分析了电磁铆接后坐力特征,得到1000 V电压下电磁铆接后坐力动量略小于30 N·s,可为电磁铆接缓冲机构精准设计提供支撑;完成了气动铆枪和电磁铆枪铆接强度对比试验,验证了半自动化电磁铆枪解决航天锥形件高质量、长寿命连接难题的可行性。 展开更多
关键词 电磁铆接 锥形筒 结构设计 后坐力 强度试验
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基于有限元的锰金属铆接结构建模及变形预测研究
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作者 夏毅锐 苏洪波 王紫潇 《中国锰业》 2024年第3期84-89,共6页
含锰金属铆接工艺作为机器制造领域的一项重要技术,在工业制造中得到广泛应用。研究通过有限元分析方式对铆接结构进行建模与失效分析,并利用有限元对含锰金属铆接结构局部单元分析来构建变形预测模型。研究结果显示,研究构建的含锰金... 含锰金属铆接工艺作为机器制造领域的一项重要技术,在工业制造中得到广泛应用。研究通过有限元分析方式对铆接结构进行建模与失效分析,并利用有限元对含锰金属铆接结构局部单元分析来构建变形预测模型。研究结果显示,研究构建的含锰金属铆接结构模型失效位移总误差基本小于10%,总体仿真结果良好,研究构建的铆钉变形预测模型连接单元上的平均应力为490 MPa,检测效果较好。结果表明,研究构建的含锰金属铆接结构模型与变形预测模型都具有良好的性能,能够帮助提升人们对铆接结构当前状态的认知,从而及时地处理危险因素,提升机器制造的安全性。 展开更多
关键词 含锰金属 铆接结构 应力 塑性变形 有限元
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基于等效结构应力法的铝合金无钉压铆接头疲劳分析与试验研究
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作者 曾维和 苟黎刚 +2 位作者 王明庆 王磊 俞荣贵 《中国机械工程》 EI CAS CSCD 北大核心 2024年第6期1129-1139,共11页
以无钉压铆连接铝合金接头为研究对象,通过测试三组料厚不等的搭接试样拉伸强度和疲劳力学性能,研究了铝合金无钉压铆接头失效断裂行为,获得压铆连接试样力-寿命(F-N)分布规律。根据试样疲劳测试条件建立等效有限元模型,并计算等效结构... 以无钉压铆连接铝合金接头为研究对象,通过测试三组料厚不等的搭接试样拉伸强度和疲劳力学性能,研究了铝合金无钉压铆接头失效断裂行为,获得压铆连接试样力-寿命(F-N)分布规律。根据试样疲劳测试条件建立等效有限元模型,并计算等效结构应力幅ΔSs,对实测的疲劳寿命散点数据进行Weibull分析,并基于最小二乘法拟合得到无铆连接ΔSs-N(主S-N)曲线关键参数。应用拟合的主S-N曲线进行纯电车型全铝合金引擎盖动态关闭无钉压铆连接疲劳损伤预测,结果表明:无钉压铆接头疲劳开裂发生在颈部位置,其ΔSs-N曲线满足幂函数关系,经连接点数量和位置优化设计,铝合金引擎盖关键区域无钉压铆连接最大损伤由1.08降低至0.78,满足了引擎盖动态关闭耐久性能设计要求。开发的计算方法和主S-N曲线参数可为车身领域无钉压铆连接疲劳仿真与优化提供理论依据。 展开更多
关键词 全铝合金引擎盖 无钉压铆接头 等效结构应力 有限元分析 疲劳试验
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连接方式对HC420/780DP-AA6063接头剪切拉伸性能的影响
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作者 覃清钰 韦超忠 +2 位作者 唐博威 张发晖 廖祖煜 《汽车工艺与材料》 2024年第9期49-53,共5页
通过剪切拉伸试验研究了HC420/780DP钢与AA6063挤压铝合金胶接、自冲铆接、螺栓连接、胶铆连接及胶螺连接接头的剪切拉伸性能,结果表明:自冲铆接和螺栓连接会破坏板材的完整性,剪切拉伸过程中铆钉或螺栓与板材接触位置发生应力集中,导... 通过剪切拉伸试验研究了HC420/780DP钢与AA6063挤压铝合金胶接、自冲铆接、螺栓连接、胶铆连接及胶螺连接接头的剪切拉伸性能,结果表明:自冲铆接和螺栓连接会破坏板材的完整性,剪切拉伸过程中铆钉或螺栓与板材接触位置发生应力集中,导致裂纹萌生、扩展,最终铆钉拉脱或AA6063挤压铝合金撕裂;结构胶增大了钢/铝接头的受力面积,剪切拉伸过程中强度较低的AA6063挤压铝合金发生断裂;胶接、胶铆连接、胶螺连接接头最大剪切载荷基本一致,但胶铆连接、胶螺连接接头吸收的能量与胶接接头相比分别增大了11.8%和8%;当钢/铝接头处于仅受剪切拉伸载荷的服役环境时,可考虑单独使用结构胶进行连接,无需额外使用自冲铆接或螺栓连接。 展开更多
关键词 结构胶 自冲铆接 螺栓连接 复合连接 力学性能
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