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Experimental study of dynamic mechanical properties of reactive powder concrete under high-strain-rate impacts

Science China(technological Sciences) 2010年第9期53卷 2435-2449页

作者： JU Yang1,2,LIU HongBin1,SHEnG GuoHua1,3 & WAnG HuiJie1 1 State Key Laboratory of Coal Resources and Safe Mining,Beijing Key Laboratory of Fracture and Damage Mechanics of Rocks and Concrete,China university of Mining and technology,Beijing 100083,China 2 department of mechanical and manufacturing engineering,university of calgary,2500 university drive,ab t2n 1n4,canada 3 School of Resources and Civil engineering,northeastern university,Shenyang 110004,China 1. State Key Laboratory of Coal Resources and Safe Mining Beijing Key Laboratory of Fracture and Damage Mechanics of Rocks and Concrete China University of Mining and Technology Beijing 100083 China2. Department of Mechanical and Manufacturing Engineering University of Calgary 2500 University Drive AB T2N 1N4 Calgary Canada3. School of Resources and Civil Engineering Northeastern University Shenyang 110004 China

the dynamic mechanical properties of reactive powder concrete subjected to compressive impacts with high strain rates ranging from 10 to 1.1×102 s-1 were investigated by means of SHPB (split-Hopkinson-pressure-bar) tests of the cylindrical specimens with five different steel fiber volumetric *** properties of wave stress transmission,failure,strength,and energy consumption of RPC with varied fiber volumes and impact strain rates were *** influences of impact strain rates and fiber volumes on those properties were characterized as *** general forms of the dynamic stress-strain relationships of RPC were modeled based on the experimental *** investigations indicate that for the plain RPC the stress response is greater than the strain response,showing strong brittle *** RPC with a certain volume of fibers sustains higher strain rate impact and exhibits better deformability as compared with the plain *** a constant fiber fraction,the peak compressive strength,corresponding peak strain and the residual strain of the fiber-reinforced RPC rise by varying amounts when the impact strain rate increases,with the residual strain demonstrating the greatest *** the fiber content makes trivial contribution to improving the residual deformability of RPC when the impact strain rate is *** tests also show that the fiber content affects the peak compressive strength and the peak deformability of RPC in a different *** a constant impact strain rate and the fiber fraction less than 1.75%,the peak compressive strength rises with an increasing fiber *** peak compressive strength tends to decrease as the fiber volume exceeds 1.75%.the corresponding peak strain,however,incessantly rises with the increasing fiber *** total energy Edisp that RPC consumed during the period from the beginning of impacts to the time of residual strains elevates with the fiber volume increment as long as the fiber fraction

关键词： impact reactive powder concrete (RPC) high strain rate dynamic strength energy consumption dynamic stress-strain response

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A statistical model for porous structure of rocks

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Science China(technological Sciences) 2008年第11期51卷 2040-2058页

作者： JU Yang1,2, YAnG YongMing1, SOnG ZhenDuo3 & XU WenJing4 1 State Key Laboratory of Coal Resources and Safe Mining, China university of Mining & technology, Beijing 100083, China 2 department of mechanical and manufacturing engineering, the university of calgary, 2500 university drive nW calgary, ab t2n 1n4, canada 3 China national Coal Mining Equipment Co. Ltd, Beijing 100011, China 4 department of Materials and Metallurgy, the university of Utah, Salt Lake City, Utah 84112, USA State Key Laboratory of Coal Resources and Safe Mining China University of Mining & Technology Beijing 100083 China department of mechanical and manufacturing engineering The University of Calgary 2500 University Drive NW Calgary Calgary AB T2N 1N4 Canada China national Coal Mining Equipment Co. Ltd Beijing 100011 China department of Materials and Metallurgy The University of Utah Salt Lake City Utah 84112 USA

the geometric features and the distribution properties of pores in rocks were in- vestigated by means of Ct scanning tests of sandstones. the centroidal coordi- nates of pores, the statistic characterristics of pore distance, quantity, size and their probability density functions were formulated in this paper. the Monte Carlo method and the random number generating algorithm were employed to generate two series of random numbers with the desired statistic characteristics and prob- ability density functions upon which the random distribution of pore position, dis- tance and quantity were determined. A three-dimensional porous structural model of sandstone was constructed based on the FLAC3D program and the information of the pore position and distribution that the series of random numbers defined. On the basis of modelling, the Brazil split tests of rock discs were carried out to ex- amine the stress distribution, the pattern of element failure and the inosculation of failed elements. the simulation indicated that the proposed model was consistent with the realistic porous structure of rock in terms of their statistic properties of pores and geometric similarity. the built-up model disclosed the influence of pores on the stress distribution, failure mode of material elements and the inosculation of failed elements.

关键词： porous structure statistical model random numbers reconstruction rocks

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Rolling Element Bearing Diagnostics by Combination of Envelope Analysis and Wavelet transform

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Journal of university of Science and technology Beijing 2001年第1期8卷 69-74页

作者： Ying tang, Qiao Sun mechanical engineering School, university of Science and technology Beijing, Beijing 100083, China department of mechanical engineering, university of calgary calgary Alberta t2n 1n4, canada Univ Sci & technol Beijing Sch Mech Engn Beijing 100083 Peoples R China Univ calgary Dept Mech Engn Calgary AB T2N 1N4 Canada

Rolling element-bearing diagnostics has been studied over the last thirty years, and envelope analysis is widely recognized as being the best approach for detection and diagnosis of rolling element bearing incipient failure. But one of the on-going difficulties with envelope technique is to determine the best frequency band to envelop. Here, wavelet transform technique is introduced into envelope analysis to solve the problem by capturing bearing defects-sensory scales (i.e. frequency bands). A modulated Gaussian function is chosen to be the analytical wavelet because it coincides well with bearing defect-induced vibration signal patterns. Vibration signals measured from railway bearing tests were studied by the proposed method. Cases of bearings with single and multiple defects on inner and outer race under different testing conditions are presented. Experimental results showed that the proposed method allowed a more accurate local description and separation of transient signal part, which were caused by impacts between defects and the mating surfaces in the bearing. the combination method provides an effective signal detection technique for rolling element-bearing diagnostics.

关键词： continuous wavelet transform envelope analysis rolling element bearing diagnostics

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numerical simulation of mechanisms of deformation,failure and energy dissipation in porous rock media subjected to wave stresses

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Science China(technological Sciences) 2010年第4期53卷 1098-1113页

作者： JU Yang1,2,WAnG HuiJie1,YAnG YongMing1,HU QinAng3 & PEnG RuiDong1 1 State Key Laboratory of Coal Resources and Safe Mining,Beijing Key Laboratory of Fracture and Damage Mechanics of Rock and Concrete,China university of Mining and technology,Beijing 100083,China 2 department of mechanical and manufacturing engineering,university of calgary,calgary,Alberta,t2n 1n4,canada 3 School of Environment and Civil engineering,College of engineering,Oklahoma State university,Stillwater,OK 74078,USA 1. State Key Laboratory of Coal Resources and Safe Mining Beijing Key Laboratory of Fracture and Damage Mechanics of Rock and Concrete China University of Mining and Technology Beijing 100083 China2. Department of Mechanical and Manufacturing Engineering University of Calgary Calgary Alberta T2N 1N4 Canada3. School of Environment and Civil Engineering College of Engineering Oklahoma State University Stillwater OK 74078 USA

the pore characteristics,mineral compositions,physical and mechanical properties of the subarkose sandstones were acquired by means of Ct scan,X-ray diffraction and physical tests.A few physical models possessing the same pore characteristics and matrix properties but different porosities compared to the natural sandstones were *** 3D finite element models of the rock media with varied porosities were established based on the Ct image processing of the physical models and the MIMICS software *** failure processes of the porous rock media loaded by the split Hopkinson pressure bar(SHPB) were simulated by satisfying the elastic wave propagation *** dynamic responses,stress transition,deformation and failure mechanisms of the porous rock media subjected to the wave stresses were *** is shown that an explicit and quantitative analysis of the stress,strain and deformation and failure mechanisms of porous rocks under the wave stresses can be achieved by using the developed 3D finite element *** applied wave stresses of certain amplitude and velocity,no evident pore deformation was observed for the rock media with a porosity less than 15%.the deformation is dominantly the combination of microplasticity(shear strain),cracking(tensile strain) of matrix and coalescence of the cracked regions around *** stresses lead to microplasticity,while tensile stresses result in cracking of the *** and coalescence of the matrix elements in the neighborhood of pores resulted from the high transverse tensile stress or tensile strain which exceeded the threshold *** simulation results of stress wave propagation,deformation and failure mechanisms and energy dissipation in porous rock media were in good agreement with the physical *** present study provides a reference for analyzing the intrinsic mechanisms of the complex dynamic response,stress transit mode,deformation and failure mechanisms and the disaster mechanism

关键词： porous media three-dimensional finite element model rock media stress wave failure mechanism energy dissipation

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MICROMACHInInG WItH FEMtOSECOnD LASER

MICROMACHINING WITH FEMTOSECOND LASER

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第七届海内外青年设计与制造科学会议

作者： Yiliu tu and Ming Xia department of mechanical and manufacturing engineering university of calgary calgary ab canada t2n 1n4

＜正＞Femtosecond laser micromachining is a new approach emerging in MEMS area in recent years. Although some applications have been reported, this technology is still not matured and not understood very well. Femtosecond lasers currently show much promise as potential effective tools in micromachining or micro-system applications, which include industrial material processing, biomedicine, photonics, and semiconductors. this paper reviewed femtosecond laser technology with emphasis on mode-locked technology and chirped pulsed amplification （CPA）. We described the most important difference between femtosecond laser and traditional lasers, which is multiphoton absorption during laser material interaction. We introduced the configuration and principle of our femtosecond laser micromachining workstation and the status of micromachining with femtosecond laser pulses in the literature. Some advantages and applications such as processing different materials including transparent materials and creating very fine features （on the order of tens of nm） are presented. Finally, we suggested several future efforts that are parameter selection and optimization of micromachining processing, development of process and tolerance control algorithms, development of sensors and measurement methods, and development of the theory and methods of design for the femtosecond laser micromachining application. to achieve these targets effectively we proposed a "free force" 3D micromachining concept using lasers including femtosecond laser to create micro and nanostructures.

关键词： Laser Micromachining Femtosecond Laser Ultrafast Laser Laser ablation

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Fundamental Research in Pipeline Corrosion and Stress Corrosion Cracking

Fundamental Research in Pipeline Corrosion and Stress Corros...

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第十三次全国电化学会议

作者： Yufeng Cheng Dept. of mechanical and manufacturing engineering, university of calgary, calgary, ab, t2n 1n4, canada

＜正＞Corrosion and stress corrosion cracking （SCC） have caused significant failures in gas and oil transmission pipelines in canada, resulting in extremely serious consequences in environment, economy and energy transportation. Particularly, SCC-induced pipeline failures are low-probability, high-consequence events. the potential catastrophic effects are evident from the damage caused by the stress corrosion cracking of the transcanada pipeline in 1996, destroying a house 178 metres away as well as nearby power lines, trees, and other vegetation. In addition, millions of cubic feet of natural gas were lost.

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A MULtI-WORLD MECHAnISM FOR MODELInG EVOLUtIOnARY DESIGn PROCESS FROM COnCEPtUAL DESIGn tO DEtAILED DESIGn

A MULTI-WORLD MECHANISM FOR MODELING EVOLUTIONARY DESIGN PRO...

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第七届海内外青年设计与制造科学会议

作者： Deyi Xue Haoguang Yang and Yiliu tu department of mechanical and manufacturing engineering university of calgary canada

＜正＞A multi-world mechanism is developed in this research for modeling evolutionary design process from conceptual design to detailed design. In this mechanism, the evolutionary design database is represented by a sequence of worlds corresponding to the design descriptions at different design stages. In each world, only the differences with its ancestor world are recorded. When the design descriptions in one world are changed, these changes arc then propagated to its descendant worlds automatically. Case study is conducted to show the effectiveness of this evolutionary design database model.

关键词： Design database Design process Design evolution

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Microstructure,mechanical properties and corrosion behavior of Al-Si-Cu-Zn-X(X=Bi,Sb,Sr) die cast alloy

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transactions of nonferrous Metals Society of China 2016年第1期26卷 28-38页

作者： Saeed FARAHAnY Ali OURDJ1nI Hamid Reza BAKHSHESHI-RAD department of Materials and mechanical engineering Buein Zahra Technical UniversityQazvin 345 1745346Iran department of mechanical engineering Faculty of EngineeringUniversity of OttawaOttawa161 Louis PasteurKIN 6N5Canada department of Materials Manufacturing and Industrial EngineeringFaculty of Mechanical EngineeringUniversiti Teknologi Malaysia(UTM)Johor Bahru 81310Malaysia

the microstructure evolution, mechanical and corrosion properties of Al-11Si-2Cu-0.8Zn die cast alloy treated with Bi, Sb and Sr additions were investigated. the results of mechanical testing showed that all additions increased impact toughness, ultimate tensile strength, and elongation of the alloy as a result of change in eutectic Si morphology. the analysis of fracture surfaces revealed that with addition of Sr and to lesser extent Bi and Sb, the alloy exhibited a predominantly ductile fracture rather than quasi-cleavage brittle fracture. Moreover, with the additions of Sr, Bi and Sb, the quality index increased to 164.7 MPa, 156.3 MPa and 152.6 MPa respectively from 102 MPa for the base alloy. Polarization corrosion tests conducted in sodium chloride solution showed that the corrosion potential shifted to more negative values with additions of Sb, Bi and Sr, respectively. Corrosion immersion tests also revealed that the element additions have a detrimental effect on the corrosion rate of alloys, due to the increase of boundaries between the Al and eutectic Si phases.

关键词： aluminium die cast alloy melt treatment mechanical properties fracture corrosion

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Is cellular therapy beneficial in management of rotator cuff tears?Meta-analysis of comparative clinical studies

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World Journal of Meta-Analysis 2022年第3期10卷 162-176页

作者： Sathish Muthu Cheruku Mogulesh Vibhu Krishnan Viswanathan naveen Jeyaraman Satvik n Pai Madhan Jeyaraman Manish Khanna department of Orthopaedics Government Medical College and HospitalDindigul 624001Tamil NaduIndia department of Biotechnology School of Engineering and TechnologySharda UniversityGreater Noida 201306Uttar PradeshIndia Indian Stem Cell Study Group Association Lucknow 226010Uttar PradeshIndia department of Orthopaedic Rheuamtology Dr Ram Manohar Lohiya National Law UniversityLucknow 226010Uttar PradeshIndia department of MSK Oncology University of CalgaryAlberta AB T2N 1N4AlbertaCanada department of Orthopaedics Atlas Hospitals(The Tamil Nadu Dr MGR Medical University)Tiruchirappalli 620002Tamil NaduIndia department of Orthopaedics Sri Ramachandra Medical College and Research InstituteChennai 600116Tamil NaduIndia department of Orthopaedics Faculty of MedicineSri Lalithambigai Medical College and HospitalDr MGR Educational and Research InstituteChennai 600095Tamil NaduIndia department of Orthopaedics South Texas Orthopaedic Research Institute(STORI Inc.)LaredoTX 78045United States department of Orthopaedics Autonomous State Medical CollegeAyodhya 224135Uttar PradeshIndia

BACKGROUnD Mesenchymal stromal cell(MSC)-based cellular therapy promotes type I collagen production,enhance mechanical strength of tissues,and enhance biology at the bone-tendon interface,which primarily explains their potential clinical utility in rotator cuff(RC)*** to analyze the efficacy and safety of cellular therapy utilizing MSCs in the management of RC tears from clinical studies available in the *** We conducted independent and duplicate electronic database searches including PubMed,Embase,Reference Citation Anallysis,Web of Science,and Cochrane Library in August 2021 for studies analyzing the efficacy and safety of cellular therapy(Ct)utilizing MSCs in the management of RC *** Analog Score(VAS)score for pain,American Shoulder and Elbow Surgeons(ASES)score,Disability of the Arm,Shoulder,and Hand score,Constant score,radiological assessment of healing,and complications such as retear rate and adverse events were the outcomes *** was performed in R-platform using OpenMeta[Analyst]*** Six studies involving 238 patients were included for *** noted a significant reduction in VAS score for pain at 3 mo(weighed mean difference[WMD]=-2.234,Pnd 6 mo(WMD=-3.078,Pth the use of Ct,which was not maintained at long-term follow-up(WMD=-0.749,P=0.544).Concerning functional outcomes,utilization of Ct produced a significant shortterm improvement in the ASES score(WMD=17.090,Pnd significant benefit in functional scores such as Constant score(WMD=0.833,P=0.760)at long-term ***,we also observed significantly improved radiological tendon healing during the longterm follow-up(odds ratio[OR]=3.252,P=0.059).We also noted a significant reduction in the retear rate upon utilization of Ct in RC tears both at short-(OR=0.079,P=0.032)and long-term(OR=0.434,P=0.027)*** did not observe any significant increase in the adverse events directly related to cellular therapy,as comp

关键词： Mesenchymal stromal cell Bone-marrow derived mesenchymal stromal cell Adipose-derived mesenchymal stromal cell Rotator cuff tear Cellular therapy Meta-analysis

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Decline in subarachnoid haemorrhage volumes associated with the first wave of the COVID- 19 pandemic

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Stroke & Vascular neurology 2021年第4期6卷 542-552,I0026-I0032页

作者： thanh n nguyen Diogo C Haussen Muhammad M Qureshi Hiroshi Yamagami toshiyuki Fujinaka Ossama Y Mansour Mohamad abdalkader Michael Frankel Zhongming Qiu Allan taylor Pedro Lylyk Omer F Eker Laura Mechtouff Michel Piotin Fabricio Oliveira Lima Francisco Mont'Alverne Wazim Izzath nobuyuki Sakai Mahmoud Mohammaden Alhamza R Al-Bayati Leonardo Renieri Salvatore Mangiafico David Ozretic Vanessa Chalumeau Saima Ahmad Umair Rashid Syed Irteza Hussain Seby John Emma Griffin John thornton Jose Antonio Fiorot Rodrigo Rivera nadia Hammami Anna M Cervantes-Arslanian Hormuzdiyar H Dasenbrock Huynh Le Vu Viet Quy nguyen Steven Hetts Romain Bourcier Romain Guile Melanie Walker Malveeka Sharma Don Frei Pascal Jabbour nabeel Herial Fawaz Al-Mufti Atilla Ozcan Ozdemir Ozlem Aykac Dheeraj Gandhi Chandril Chugh Charles Matouk Pascale Lavoie Randall Edgell Andre Beer-Furlan Michael Chen Monika Killer-Oberpfalzer Vitor Mendes Pereira Patrick nicholson Vikram Huded nobuyuki Ohara Daisuke Watanabe Dong Hun Shin Pedro SC Magalhaes Raghid Kikano Santiago Ortega-Gutierrez Mudassir Farooqui Amal abou-Hamden tatsuo Amano Ryoo Yamamoto Adrienne Weeks Elena A Cora Rotem Sivan-Hoffmann Roberto Crosa Markus Möhlenbruch Simon nagel Hosam Al-Jehani Sunil A Sheth Victor S Lopez Rivera James E Siegler Achmad Fidaus Sani Ajit S Puri Anna Luisa Kuhn Gianmarco Bernava Paolo Machi Daniel G abud Octavio M Pontes-neto Ajay K Wakhloo Barbara Voetsch Eytan Raz Shadi Yaghi Brijesh P Mehta naoto Kimura Mamoru Murakami Jin Soo Lee Ji Man Hong Robert Fahed Gregory Walker Eiji Hagashi Steve M Cordina Hong Gee Roh Ken Wong Juan F Arenillas Mario Martinez-Galdamez Jordi Blasco Alejandro Rodriguez Vasquez Luisa Fonseca M Luis Silva teddy Y Wu Simon John Alex Brehm Marios Psychogios William J Mack Matthew tenser tatemi todaka Miki Fujimura Roberta novakovic Jun Deguchi Yuri Sugiura Hiroshi tokimura Rakesh Khatri Michael Kelly Lissa Peeling Yuichi Murayama Hugh Stephen Winters Johnny Wong Mohamed teleb Jeremy Payne Hiroki Fukuda Kosuke Miyake Junsuke Shimbo Yusuke Sug neurology RadiologyBoston Medical CenterBostonMassachusettsUSA neurology Marcus Stroke&Neuroscience CenterGrady Memorial HospitalEmory University School of MedicineAtlantaGAUSA Radiology Radiation OncologyBoston University School of MedicineBostonMassachusettsUSA neurology National Hospital Organization Osaka National HospitalOsakaJapan neurosurgery National Hospital Organization Osaka National HospitalOsakaJapan neurology Alexandria UniversityAlexandriaEgypt Radiology Boston Medical CenterBostonMassachusettsUSA department of neurology Xinqiao HospitalChongqingChina neurosurgery University of Cape TownRondeboschWestern CapeSouth Africa neurosurgery Interventional NeuroradiologyClinica La Sagrada FamiliaBuenos AiresArgentina neuroradiologie Neurologie VasculaireHospices Civils de LyonLyonAuvergne-Rhône AlpesFrance neurologie Vasculaire Hospices Civils de LyonLyonAuvergne-Rhône AlpesFrance Interventional neuroradiology Fondation Ophtalmologique Adolphe de RothschildParisÎle-de FranceFrance neurology Hospital Geral de FortalezaFortalezaBrazil Interventional neuroradiology Hospital Geral de FortalezaFortalezaBrazil neuroradiology Nottingham University Hospitals NHS TrustNottinghamUK department of neurosurgery Kobe City Medical Center General HospitalKobeHyogoJapan Interventional neurovascular Unit University Hospital CareggiFirenzeToscanaItaly neuroradiology University Hospital Centre ZagrebZagrebCroatia Interventional neuroradiology Hopital BicetreLe Kremlin-BicetreFrance Stroke and Interventional neuroradiology Lahore General HospitalLahorePakistan neurological Institute Cleveland Clinic Abu DhabiAbu DhabiUAE department of Radiology Beaumont HospitalDublinIreland neurology Stroke UnitHospital-Estadual CentralVitoriaBrazil neuroradiology Instituto de Neurocirugia Dr AsengoSantiagoChile Interventional neuroradiology Institut National de NeurologieTunisTunisia neurology Boston Medical CenterBostonMassachusettsUSA neurosurgery Boston Medical Center

Background During the COVID-19 pandemic,decreased volumes of stroke admissions and mechanical thrombectomy were *** study’s objective was to examine whether subarachnoid haemorrhage(SAH)hospitalisations and ruptured aneurysm coiling interventions demonstrated similar *** We conducted a cross-sectional,retrospective,observational study across 6 continents,37 countries and 140 comprehensive stroke *** with the diagnosis of SAH,aneurysmal SAH,ruptured aneurysm coiling interventions and COVID-19 were identified by prospective aneurysm databases or by International Classification of Diseases,10th Revision,*** 3-month cumulative volume,monthly volumes for SAH hospitalisations and ruptured aneurysm coiling procedures were compared for the period before(1 year and immediately before)and during the pandemic,defined as 1 March-31 May *** prior 1-year control period(1 March-31 May 2019)was obtained to account for seasonal *** there was a significant decline in SAH hospitalisations,with 2044 admissions in the 3 months immediately before and 1585 admissions during the pandemic,representing a relative decline of 22.5%(95%CI−24.3%to−20.7%,ption of ruptured aneurysms declined with 1170-1035 procedures,respectively,representing an 11.5%(95%CI−13.5%to−9.8%,p=0.002)relative *** analysis was noted for aneurysmal SAH hospitalisation decline from 834 to 626 hospitalisations,a 24.9%relative decline(95%CI−28.0%to−22.1%,ptive increase in ruptured aneurysm coiling was noted in low coiling volume hospitals of 41.1%(95%CI 32.3%to 50.6%,p=0.008)despite a decrease in SAH admissions in this *** there was a relative decrease in the volume of SAH hospitalisations,aneurysmal SAH hospitalisations and ruptured aneurysm embolisations during the COVID-19 *** findings in SAH are consistent with a decrease in other emergencies,such as stroke and myocardial infarction.

关键词： diagnosis representing subarachnoid

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