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Direct joining of oxygen-free copper and carbon-fiber-reinforced plastic by friction lap joining

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Journal of Materials Science & Technology 2018年第1期34卷 192-197页

作者： L.h. Wu k. Nagatsuka k. Nakata Joining and Welding Research Institute Osaka University 11-1 Mihogaoka Ibaraki Osaka 567-0047 Japan

Oxygen-flee copper （Cu） was successfully joined to carbon-fiber-reinforced thermoplastic （CFRTP, polyamide 6 with 20wt% carbon fiber addition） by friction lap joining （FLJ） at joining speeds of 200-1600 mm/min with a constant rotation rate of 1500 rpm and a nominal plunge depth of 0.9 ram. It is the first time to report the joining of CFRTP to Cu by FLJ. As the joining speed increased, the tensile shear force （TSF） of joints increased first, and decreased thereafter. The maximum TSF could reach 2.3 kN （ 15 mm in width）. hydrogen bonding formed between the amide group of CFRTP and the thin Cu20 layer on the Cu surface, which mainly contributed to the joint bonding. The influence factors of the TSF of the joints at different joining speeds were discussed. The TSF was mainly affected by the joining area, the degradation of the plastic matrix and the number and the size of bubbles. As the joining speed increased, the influence factors varied as follows： the joining area increased first and then decreased; the degra- dation of the plastic matrix and the number and the size of bubbles decreased. The maximum TSF was the comprehensive result of the relatively large joining area, small degradation of the plastic matrix and small number and sizes of bubbles.

关键词： Friction lap joining Metal Plastic Carbon-fiber reinforced thermoplastic Dissimilar materials joining

Large nonlinear deflection behavior of IPMC actuators analyzed with an electromechanical model

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Acta Mechanica Sinica 2019年第5期35卷 992-1000页

作者： h.G.Liu k.Bian k.Xiong Faculty of Civil Engineering and Mechanics Jiangsu UniversityZhenjiang 212013China State key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Mechanical and Electrical Engineering Guangzhou UniversityGuangzhou 510006China

This study presents an electromechanical engineering model for the analysis of the large deflection curves of ionic polymer-metal composite(IPMC)cantilever actuators under direct current(DC)*** this paper,the longitudinal normal strain performance of the material was investigated using digital image correlation on a *** deflection of the actuator is analytically obtained with the application of an elliptic integration method based on the relationship between strain gradient and excitation voltage,and the minimum excitation voltage is derived based on the assumption that the actuators have small *** validity of the electromechanical model is then justified with the experimental results obtained from Pt-and Ag-IPMC actuators at various excitation *** findings of this study confirm that the introduced electromechanical model can accurately describe the large nonlinear deflection behavior of IPMC actuators.

关键词： Actuator Ionic polymer metal composite Large deflection Electromechanical model

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桥梁时变移动车载的间接识别

振动工程学报 2005年第1期18卷 99-102页

作者：余岭 chan T h T 长江科学院爆破与振动研究所湖北武汉430010 Department of Civil and Structural Engineering Thehong kong Poly technic University Hung HomKowloonHong Kong

针对桥梁上时变移动车载 ,提出了两种桥梁模型、四种移动车载间接识别方法和两种不同解决方案 ,并通过模型实验对上述不同桥梁移动车载解决方案进行验证。仿真和试验结果表明 :虽然各种车桥参数对识别结果都有不同程度的影响 ,但每种解... 详细信息

针对桥梁上时变移动车载 ,提出了两种桥梁模型、四种移动车载间接识别方法和两种不同解决方案 ,并通过模型实验对上述不同桥梁移动车载解决方案进行验证。仿真和试验结果表明 :虽然各种车桥参数对识别结果都有不同程度的影响 ,但每种解决方案都能有效识别桥梁移动车载且以“时域法”和“频时域法”识别精度较高、实用性较强 ,可推荐用于现场桥梁移动车载识别。

关键词：动车桥梁车桥车载时变时域法模型实验移动解决方案识别

Esophageal squamous papilloma lacks clear clinicopathological associations

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World Journal of Clinical Cases 2017年第4期5卷 134-139页

作者： Bilel Jideh Martin Weltman Yang Wu Calvin h Y chan Department of Gastroenterology and hepatology Nepean Hospital

AIM To determine the prevalence of esophageal squamous papillomas(ESPs) in a tertiary teaching hospital and to assess for any clinical associations, including relations with esophageal squamous cell carcinomas(SCCs). METhODS Data from a total of 6962 upper gastrointestinal endoscopies over a five year period were retrospectively obtained and analysed. RESULTS ESP was found in sixteen patients(0.23%). Eight(50%) patients had a high body mass index, seven(44%) had history of cigarette smoking. Reflux esophagitis was found in four(25%) patients. All ESPs were solitary with a mean endoscopic size of 3.8 mm and located in the mid to lower esophagus. human papilloma virus(hPV) was tested in three(19%) patients and was negative. Esophageal SCC was found in seven patients(0.10%) during the same period. None of the specimens were tested for hPV, and none had associated papillomatous changes. CONCLUSION ESP is an uncommon tumour with unclear clinical associations and malignant potential.

关键词： Esophagus Papilloma Gastroesophageal reflux disease human papilloma virus Squamous cell carcinoma

Achieving superior mechanical properties in friction lap joints of copper to carbon-fiber-reinforced plastic by tool offsetting

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Journal of Materials Science & Technology 2018年第9期34卷 1628-1637页

作者： L.h.Wu k.Nagatsuka k.Nakata Joining and Welding Research Institute Osaka University

It is a challenge to achieve a sound welded metal/carbon-fiber-reinforced thermoplastic（CFRTP） joint with high strength and few bubbles. In this study, sound lap joints of Cu and CFRTP were obtained by friction lap joining（FLJ） directly at rotation rates of 600-2000 rpm, with the welding tool at the joint center and offsetting the tool 7 mm away from the center toward the retreating side, respectively. Tool offsetting reduced the non-uniform temperature distribution in the lap joints resulting from the high conductivity of Cu, which not only enhanced the tensile shear force from 0.89-2.25 kN to 1.71-3.54 kN,with the maximum increasing rate of 135%, but also reduced the bubble area to only 19% of the original level of 2000 rpm. It is the first time to report a high-quality Cu/CFRTP joint with a high strength and few bubbles. The large increase of the strength after tool offsetting was attributed to the increase of the joining area, the decrease of bubbles and the decrease of the CFRTP degradation. The details on the generation,quantitative distribution and expulsion of the bubbles in the FLJ joints were discussed.

关键词： hybrid joining Plastic Metal Carbon-fiber-reinforced plastic Properties

AUTOMATIC ORDER-DETERMINATION OF TRANSIENT IN--PLANE DISPLACEMENT MOIRE PATTERNS

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Acta Mechanica Sinica 1993年第1期9卷 86-92页

作者：方竞 k.h.Laermann Department of Mechanics Peking University Beijing China 100871 FB-11 BautechnikUniversitat Wuppertal WuppertalGermany

This paper presents a fringe-carrier method that eliminates sign ambiguity of transient moire fringes which can be used to automatically determine the relative orders. A fringe carrier is preset in the static state of the specimen and the dynamic in-plane displacements are recorded as the modulation to the frequency of the carrier fringes when the specimen is loaded by impact. According to a modulating criterion developed from the modulation degree, the fringes of the transient moire patterns keep monotonical in orders so that they can be automatically encoded in grey levels by a digital image system. The moire orders purely caused by dynamic loadings are evaluated by subtracting the grey-value of the unmodulated carrier image from that of the modulated carrier images encoded by their orders. With the subtracted moire orders the strain components can be obtained, and, correspondingly, the histograms of dynamic displacement moire images are shown with order variation by image-difference.

关键词： dynamic moire patterns transient strains digital impage processing

A STUDY ON SOME PROBLEMS ON EXISTENCE OF SOLUTIONS FOR NONLINEAR FUNCTIONAL-INTEGRAL EQUATIONS

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Acta Mathematica Scientia 2013年第5期33卷 1305-1313页

作者： DEEPMALA h.k.PAThAk School of Studies in Mathematics Pt.Ravishankar Shukla University

In this paper, we prove the existence of solutions of some nonlinear functional- integral equation by using a fixed point theorem which satisfy the Darbo condition. The results extend the corresponding results of many... 详细信息

关键词： Banach algebra fixed point functional-integral equation measure of non- compactness

Life made easy:simplifying reconstruction for dual portal veins in adult right lobe live donor liver transplantation

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hepatobiliary & Pancreatic Diseases International 2010年第5期9卷 547-549页

作者： Albert C.Y.chan Chung Mau Lo kenneth S.h.Chok See Ching chan Sheung Tat Fan Department of Surgery The University of Hong KongQueen Mary Hospital

In live donor liver transplantation, anatomical anomalies of the portal vein are more frequently encountered in right lobe than left lobe grafts. Of these, a dual portal vein is one of the most common anatomical anomalies encountered. We hereby report our method of using a recipient portal vein patch after venoplasty for reconstruction in a right lobe graft with separate anterior and posterior portal vein branches.

关键词： live donor liver transplantation portal vein reconstruction dual portal vein

Deformation heterogeneity of Ti under cryogenic channel-die compression

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Progress in Natural Science:Materials International 2011年第4期21卷 277-285页

作者： k.h.kIM S.k.hWANG Division of Materials Science and Engineering Inha University

Commercial purity Ti was subjected to channel die compression in liquid nitrogen for the purpose of studying its deformation characteristics from the viewpoint of the grain refinement induced by severe plastic *** specimens showed microstructural heterogeneity in that the initial blocky grains of about 50 urn in size turned into a mixture of the easily deforming soft grains and the hard grains revealing local concentration of dislocations and deformation *** electron back scattered diffraction analysis the in-grain misorientation-axis distribution was studied,from which it was found that the deformation heterogeneity resulted from the anisotropy of individual grains with respect to the compression die:while the soft grains were those oriented favorably for the prismslip,the hard ones were oriented for non-prism slips and deformation *** difference in the response of individual grains,therefore,led to a remarkable effect of the crystal texture of specimens on the maximum strain that can be imposed on specimens without *** on the present results,a way to achieve expedient grain refinement through the cryogenic plane-strain compression was suggested.

关键词： titanium cryogenic deformation texture microstructure