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Study of Debond Fracture Toughness of Sandwich Composites with Metal Foam Core

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Journal of Materials Science & Technology 2009年第5期25卷 713-716页

作者： Xinzhu wang Linzhi Wu shixun wang Center for Composite Materials Harbin Institute of Technology Harbin 150001 China

Two types of experiments were designed and performed to evaluate the adhesive bond in metal foam composite sandwich structures. The tensile bond strength of face/core was determined through the flatwise tensile test （FWT）. The test results show that the interfacial peel strength is lower than the interlaminar peel strength in FWT test. The mode I interracial fracture toughness （GIC） of sandwich structures containing a pre-crack on the upper face/core interface is determined by modified cracked sandwich beam （MCSB） experiment. It is found that the crack propagates unsynchronously on the two side of the specimen and the propagation of interfacial debonding always stays on the face/core interface during the MCSB tests. In order to simulate the failure of metal foam composite sandwich structures, a computational model based on the Tsai-Hill failure criterion and cohesive zone model is used. By comparing with experiment results, it can be concluded that the computational model can validly simulate the interracial failure of metal foam composite sandwich structures with reasonable accuracy.

关键词： Interfacial fracture toughness Strain energy release rate Tsai-Hill failure criterion Cohesive zone model

The effect of domestic and foreign trade coordination on technological innovation： complements or substitutes？

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Frontiers of Business Research in China 2017年第3期11卷 400-426页

作者： Lijuan Xie shixun wang1 Xiaodong wang School of business Renmin University of China Beijing 100872 China

Based on the theory of technology spillover in international trade, this paper discusses the technological innovation effect of trade by taking the influence of domestic trade into account. Under the constraint of the production possibility frontier, there is either complementarity or substitutability between domestic and foreign trade. It must be decided whether resources should be concentrated in one of the sectors （trade specialization） or instead allocated equally （trade equalization） between the two sectors. This paper firstly discusses how domestic trade and foreign trade work together to influence technological innovation, and how trade equalization and specialization affect different types of innovation. Using a provincial-level panel dataset from 2007 to 2015 in China, this paper constructs the indicators of domestic and foreign trade linkage and examines the impact of trade on innovation. The findings show that trade equalization mainly promotes incremental innovation, while trade specialization improves radical innovation. Thus, in the area of incremental innovation, attention should be paid to the equalized development of domestic and foreign trade, while in areas pursuing radical innovation, emphasis should be put on the specialization of the trade sector, avoiding equal allocation of resources to the two sectors.

关键词： Domestic and foreign trade coordination,Technological innovation effect Radical innovation,Incremental innovation

Preparation and ASE Spectrum of a Single-Mode Erbium Doped Tellurite Glass Fiber with D-type Cladding Geometry

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Journal of Materials Science & Technology 2004年第6期20卷 671-674页

作者： Junjie ZHANG, shixun DAI, Guonian wang, Shiqing XU, Shunguang LI and Lili HUShanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China Inst. of Optics and Fine Mech. Chinese Acad. of Sci. Shanghai 201800 China

Based on the host of tellurite glasses, the glass formation, preform manufacture, and fiber fabrication are described. The characterization of amplified spontaneous emission (ASE) from this newly fabricated single-mode Er3+-doped tellurite fibers is also presented. When pumped at 980 nm, a very broad erbium ASE around 1.53 μm was observed. The variations of ASE with fiber length and pumping power are measured and discussed. The output of 2 mW from Er3+-doped tellurite fiber ASE source was obtained under the pump power of 660 mW.

关键词： Preparation ASE spectrum Er^(3+) Tellurite glass fiber

Dual-phase coexistence enables to alleviate resistance drift in phase-change films

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Journal of Semiconductors 2024年第7期45卷 55-59页

作者： Tong Wu Chen Chen Jinyi Zhu Guoxiang wang shixun Dai Laboratory of Infrared Materials and Devices The Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Institute of Ocean Engineering Ningbo UniversityNingbo 315211China

The amorphous phase-change materials with spontaneous structural relaxation leads to the resistance drift with the time for phase-change neuron synaptic devices. Here, we modify the phase change properties of the conventional Ge_2Sb_2Te_5(GST) material by introducing an SnS phase. It is found that the resistance drift coefficient of SnS-doped GST was decreased from 0.06 to 0.01. It can be proposed that the origin originates from the precipitation of GST nanocrystals accompanied by the precipitation of SnS crystals compared to single-phase GST compound systems. We also found that the decrease in resistance drift can be attributed to the narrowed bandgap from 0.65 to 0.43 eV after SnS-doping. Thus, this study reveals the quantitative relationship between the resistance drift and the band gap and proposes a new idea for alleviating the resistance drift by composition optimization, which is of great significance for finding a promising phase change material.

关键词： phase change films X-ray methods resistance drift optical band gap

Controlled growth of Cu_3Se_2 nanosheets array counter electrode for quantum dots sensitized solar cell through ion exchange

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Science China Materials 2017年第7期60卷 637-645页

作者： Huiwen Bai Ting Shen shixun wang Bo Li Guozhong Cao Jianjun Tian Institute of Advanced Materials and Technology University of Science and Technology Beijing Belting 100083 China Department of Materials Science and Engineering University of Washington Seattle WA 98195-2120 USA

Copper selenide （CurSe） has great potential as counter electrode for quantum dots sensitized solar cell （QDSSC） due to its excellent electrocatalytic activity and lower charge transfer resistance. A novel ion exchange method has been utilized to fabricate Cu3Se2 nanosheets array counter electrode. CdS layer was first deposited by sputtering and used as a template to grow compact and uni- form Cu3Se2 film in a typical chemical bath. The morphology and thickness of the Cu3Se2 nanosheets were controlled by the deposition time. The final products （2h-Cu3Se2） showed significantly improved electrochemical catalytic activity and carrier transport property, leading to a much increased power conversion efficiency （4.01%） when compared with the CuS counter electrode CdS/CdSe QDSSC （3.21%）.

关键词： Cu3Se2 counter electrode quantum dots sensitizedsolar cell ion exchange

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闭孔铝泡沫在静压痕下的力学响应

复合材料学报 2010年第2期27卷 77-83页

作者：王新筑吴林志王世勋重庆大学工程力学系重庆400040 哈尔滨工业大学复合材料与结构研究所哈尔滨150080

采用球形压头对闭孔铝泡沫材料进行了准静态压痕实验,研究了不同直径、铝泡沫相对密度及边界条件对铝泡沫的压痕硬度、吸能能力及能量吸收率的影响。研究表明,铝泡沫在球形压头作用下的响应曲线可采用幂函数形式进行描述,幂函数指数随... 详细信息

采用球形压头对闭孔铝泡沫材料进行了准静态压痕实验,研究了不同直径、铝泡沫相对密度及边界条件对铝泡沫的压痕硬度、吸能能力及能量吸收率的影响。研究表明,铝泡沫在球形压头作用下的响应曲线可采用幂函数形式进行描述,幂函数指数随相对密度的增大而线性增加。铝泡沫压痕处的断面显示铝泡沫变形被严格限制在压头之下,铝泡沫的压痕变形是局部的不均匀变形。铝泡沫的压痕硬度及吸能能力均随压头直径的增大而线性减小,但它们却均随铝泡沫相对密度的增大而线性增大;能量吸收率不随压头直径和铝泡沫相对密度而变化。在一定压痕深度范围内,刚性基础和简支条件对铝泡沫的压痕响应影响可以忽略不计。最后基于实验数据分别建立了压痕硬度和吸能能力与压头直径及铝泡沫相对密度的关系。

关键词：金属泡沫压痕硬度相对密度

基于Simufact Forging高铁轮毂锻压成形工艺仿真

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热加工工艺 2018年第23期47卷 153-156页

作者：王仕勋黄冈职业技术学院

基于Simufact Forging有限元分析软件对高铁轮毂成形过程进行了仿真,着重研究了轮毂辗扩过程中的等效塑性应变、等效应力及材料流动。结果表明:高铁轮毂在辗扩过程中材料整体变形基本一致,可以获得较好的力学性能;随着锻压成形不断的进... 详细信息

基于Simufact Forging有限元分析软件对高铁轮毂成形过程进行了仿真,着重研究了轮毂辗扩过程中的等效塑性应变、等效应力及材料流动。结果表明:高铁轮毂在辗扩过程中材料整体变形基本一致,可以获得较好的力学性能;随着锻压成形不断的进行,轮毂内圈塑性应变逐渐变大;成形过程中整个轮毂应力分布较为均匀。

关键词： Simufact Forging软件高铁轮毂锻压成形仿真

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基于模糊神经网络的铝合金板拉深回弹研究

热加工工艺 2019年第3期48卷 187-189页

作者：王仕勋黄冈职业技术学院湖北黄冈438000

主要研究了6016铝合金薄板在拉深中的回弹预测。首先,根据拉深试验装置构建了三维仿真模型,并采用有限元仿真得到了不同凹凸模间隙、摩擦系数和压边力下不同测量点的回弹值。然后以这些回弹值作为试验样本,采用模糊神经网络进行了预测... 详细信息

主要研究了6016铝合金薄板在拉深中的回弹预测。首先,根据拉深试验装置构建了三维仿真模型,并采用有限元仿真得到了不同凹凸模间隙、摩擦系数和压边力下不同测量点的回弹值。然后以这些回弹值作为试验样本,采用模糊神经网络进行了预测研究。对有限元仿真和神经网络预测的回弹值与实际回弹值进行了比较。结果表明模糊神经网络对6016铝合金薄板在拉深中的回弹预测精度要明显优于有限元仿真。模糊神经网络对6016铝合金薄板在拉深中的回弹预测误差在2%～4%。

关键词：模糊神经网络拉深回弹

Correlation between clinicopathological parameters of lung adenocarcinoma and lymph node metastasis

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Oncology and Translational Medicine 2020年第4期6卷 165-169页

作者： shixun wang Gaoyang Lin Nan Ge Ronghua Yang Mengjun Li Donghua Zhao Peng Li Yongjie wang Qingdao University Qingdao 266000China Department of Thoracic Surgery The Affiliated Qingdao Hiser Medical Center of Qingdao UniversityQingdao 266000China Department of Thoracic Surgery The Affiliated Hospital of Qingdao UniversityQingdao 266000China

Objective The aim of the study was to study the correlation between the clinicopathological parameters of lung adenocarcinoma and lymph node metastasis and identify the risk factors of lymph node *** The data of 258 patients with postoperative lung adenocarcinoma(mainly based on their pathological data)were collected and analyzed,and their basic information was *** Maximum tumor diameter was found to be an independent risk factor for lymph node *** larger the maximum diameter of the tumor in patients with lung adenocarcinoma,the higher the likelihood of lymph node *** predominant adenocarcinoma with mucin production is as an independent risk factor for superior mediastinal and subcarinal lymph node *** adenocarcinomas in the lower lobe of the lung may have a higher rate of lymph node metastasis than those in the upper *** The known pathological subtypes of lung adenocarcinoma can be used for the prediction of lymph node metastasis in various regions and guide the dissection of lymph nodes that would improve patients’prognosis.

关键词： lung adenocarcinoma lymph node metastasis pathological subtype risk factors