scholarly journals Experimental Investigations on the Influence of Different Notch Designs on the Pullout Performance of Circumferentially Notched Z-pins

2020 ◽  
Vol 4 (2) ◽  
pp. 67 ◽  
Author(s):  
André Knopp ◽  
Gerhard Scharr
Keyword(s):  
Experimental Research ◽  
Experimental Investigations ◽  
Laminate Structure

The results of experimental research on the pullout properties of circumferentially notched z-pins with various notch designs are presented in this paper. Investigations on notched z-pins with four different notch designs—rectangular, circular, triangular, and sinusoidal—inserted into unidirectional (UD) and quasi-isotropic (QI) laminates were carried out in order to assess the influence of notch design and laminate structure on the resulting z-pin pullout properties. It can be shown that the application of circumferential notches at the z-pin surface causes significant increases in pullout forces and consequently, on the resulting pullout energies, regardless of which notch design is considered. The effect of notched z-pins is higher in a quasi-isotropic than in a unidirectional laminate structure. The highest enhancements of the pullout energy were found on quasi-isotropic laminates with circular and sinusoidal notch designs with increases of up to 69%, in comparison to measurements on samples with unnotched z-pins.

scholarly journals ИССЛЕДОВАНИЕ ВОЗМОЖНОСТИ РЕГИСТРАЦИИ МЕДЛЕННЫХ ДЕФОРМАЦИОННЫХ ВОЛН ЛАЗЕРНЫМ ДЕФОРМОГРАФОМ

2019 ◽  
Author(s):  
I.Y. Rasskazov ◽  
V.A. Lugovoy ◽  
D.I. Tso
Keyword(s):  
Rock Mass ◽  
Experimental Research ◽  
Seismic Waves ◽  
Gulf Of Alaska ◽  
Rock Massif ◽  
Experimental Investigations ◽  
Correct Interpretation ◽  
Acoustic Activity ◽  
Laser Measurements ◽  
Deformation Processes

В статье представлены экспериментальные исследования по обнаружению медленных деформационных волн, интенсифицирующих геомеханические процессы в массиве горных пород, с применением высокочувствительных лазерных измерений. Проведены результаты экспериментальных исследований по оценке влияния удаленных землетрясений на состояние горного массива Стрельцовского рудного поля, регистрации удаленных землетрясений и их предвестников. Приведены результаты регистрации землетрясения в заливе Аляска. Установлено влияние удаленных землетрясений на акустическую активность горного массива, которое проявляется в виде значительного увеличения количества акустических событий и их энергии после регистрации сейсмической волны. Выявлено, что наличие деформационных и сейсмических волн от удаленных землетрясений можно отнести к дополнительным факторам, инициирующим деформационные процессы в горном массиве. Своевременная регистрация данных волн и корректная их интерпретация позволят значительно повысить достоверность прогноза энергетических геодинамических событий в удароопасных массивах горных пород при разработке месторождений в целях предотвращения катастрофических событий.The article presents experimental investigations on the detection of slow waves intensifying geomechanical processes in rock massif, with the application of highsensitivity laser measurements. The results of experimental research for the evaluation of remote earthquakes impact on the condition of rock massif of Streltsovskoe ore field, registration of remote earthquakes and their forerunners are given. The results of the earthquake in the Gulf of Alaska, is represented in the article. The influence of distant earthquakes on the rock mass acoustic activity, which manifests itself in the form of a significant increase in the number of acoustic events and their energy after the registration of a seismic wave, is established. It is revealed that the presence of deformation and seismic waves from distant earthquakes can be attributed to additional factors that initiate deformation processes in the rock massif. Timely recording of these waves and their correct interpretation will significantly improve the accuracy of the prediction of energy geodynamic events in shockhazardous rock masses when developing fields in order to prevent catastrophic events.

scholarly journals XXVI. Researches on sugar formation in the liver

1860 ◽  
Vol 150 ◽  
pp. 595-609 ◽  
Keyword(s):  
Portal Vein ◽  
Experimental Research ◽  
Royal Society ◽  
Vena Cava ◽  
Experimental Investigations ◽  
Hepatic Veins ◽  
Animal Diet

The following communication is an abridgement of a paper on the same subject presented to the Royal Society in 1858, with some additional matter that has been since disclosed by my experimental investigations. The original paper, being deposited in the Archives of the Society, is accessible for reference on points of detail that are here excluded. In 1848 it was announced by Bernard that the liver enjoyed a sugar-forming function. This statement appeared to rest upon irrefutable grounds, and the new function soon became almost universally acknowledged by physiologists. An animal which had been for some time previously restricted to an animal diet was suddenly killed. Sugar was found abundantly in the blood of the vena cava and hepatic veins, whilst none existed in that of the portal vein. The tissue of the liver was also found abundantly saccharine, whilst no sugar was to be detected in any other organ. I had seen this experiment several times performed in Bernard’s laboratory, and had often repeated it myself. From the correctness of the description of his results, I entertained no doubt as to the accuracy of Bernard’s deductions, and did not for a moment seek to question them. In the course of my experimental research, however, I was conducted step by step to a point which has placed me, involuntarily as it were, in antagonism with the glycogenic theory. By pushing investigation further than had hitherto been done, I have been compulsorily brought to arrive at conclusions of which I had not the most remote anticipation beforehand.

scholarly journals Identification of the liquid mass fraction content in the wet steam

2019 ◽  
Vol 137 ◽  
pp. 01003
Author(s):  
Mirosław Majkut ◽  
Slawomłr Dykas ◽  
Krystian Smołka ◽  
Michał Strozik
Keyword(s):  
Experimental Research ◽  
Measurement Techniques ◽  
Experimental Studies ◽  
Experimental Investigations ◽  
Wet Steam ◽  
Numerical Work ◽  
Measurement Systems ◽  
University Of Technology ◽  
Measuring Techniques ◽  
Made In

The experimental research, initiated at the Institute of Power Engineering and Turbomachinery of the Silesian University of Technology at the end of the last century, created an opportunity to supplement knowledge about the phenomenon of steam flow with condensation, tested by numerical fluid mechanics by IMiUE employees. In parallel with the numerical work, significant progress has been made in experimental studies on thflow of wet steam. Recently, measuring techniques based on recording the phenomenon of extinction of light have been elaborated or improved. The basic value determined in the final stage in the experimental way was the contentof the liquid phase defined as the wetness fraction. The methodology of tests and experimental investigations was presented, as well as the applied and developed measurement systems. Next, some developed designs of X probe and their modifications are described. Article present also some examples of applications of the developed measurement techniques in application to experimental research conducted on wet steam in the IMiUE. Examples of comparison between experimental and numerical tests are also provided.

Numerical Simulation and Experimental Research on Crack Magnetic Flux Leakage Field

2011 ◽  
Author(s):  
Fujun Liu ◽  
Mulin Zheng ◽  
Shuai Kong ◽  
Zhangwei Ling ◽  
Yueqiang Qian
Keyword(s):  
Numerical Simulation ◽  
Magnetic Flux ◽  
Experimental Research ◽  
Inclination Angle ◽  
Three Dimensional ◽  
Magnetic Flux Leakage ◽  
Experimental Investigations ◽  
Leakage Field ◽  
Three Dimensional Models ◽  
Flux Leakage

Magnetic flux leakage (MFL) testing is widely used to inspect and characterize defects in pipelines, storage tanks and other structures. In this paper, based on the Maxwell Equations, numerical simulation and experimental research of crack magnetic flux leakage field were carried out. The three-dimensional models of cracks were established, the influence of the generalized crack parameters to the magnetostatic MFL field, including depth, width, inclination angle and crack spacing, was discussed. The relationship between defect parameters and MFL amplitude was obtained. The amplitude is significantly affected by the inclination angle. Therefore, single direction inspection may lead to undetected in practice. While the two cracks interval is less than 5 mm, the MFL fields would overlap. Furthermore, the experimental investigations were developed, and the results agree well with that of the simulation. The conclusions could provide valuable reference for inspection.

Fatigue Properties of Clad Metals

1971 ◽  
Vol 29 ◽  
pp. 194-195
Author(s):  
C. Turk ◽  
T. Santala ◽  
D. Jean
Keyword(s):  
Core Material ◽  
Fatigue Properties ◽  
Experimental Investigations ◽  
Ofhc Copper ◽  
Laminate Structure ◽  
Bulk Properties ◽  
Internal Interface ◽  
The Core ◽  
Propagating Crack ◽  
Clad Metals

Theoretical and experimental investigations have shown that a propagating crack can interact with an internal interface significantly affecting the bulk properties of the composite. Because only limited work has been reported regarding the effect of a laminate structure on fatigue life, Texas Instruments Conflex 326 material, which consists of 10 volume-%. OFHC copper metallurgically bonded on both sides of 80 volume-% AISI 1065 steel, was selected for fatigue experiments to study the behavior of the crack at the interface.All laminates were roll bonded, reduced to gage and annealed at 1375°F for one hour. Monolithic steel was obtained for testing by dissolving the copper cladding in a concentrated nitric acid. Milled fatigue and tensile specimens were austenitized for one hour at 1500-1550°F and water quenched. Tempering specimens were tempered at temperatures from 200°F to 1100°F. Figure 1 shows the microstructure of the core material for samples tempered at 200°F, 600°F, and 1000°F.

scholarly journals Experimental Research on the Impact of Thin-Wall Ratio and the Fillet Radius of Forming Roller on the Limiting Spinning Ratio of AMS 5504 Sheets

2017 ◽  
Vol 62 (4) ◽  
pp. 2261-2266
Author(s):  
S. Kut ◽  
F. Stachowicz ◽  
G. Ryzińska ◽  
T. Mrugała
Keyword(s):  
Experimental Research ◽  
Vertical Axis ◽  
Experimental Investigations ◽  
Geometrical Parameters ◽  
Thin Wall ◽  
Fillet Radius ◽  
Spinning Process ◽  
Metal Spinning ◽  
The Impact ◽  
Negative Phenomena

AbstractResults of experimental investigations of metal spinning process of AMS 5504 sheets. cylindrical drawpieces with use of discs-shaped sheet with various diameter and thickness were shown in this work. Tests were performed on two roller metal spinning machine of a vertical axis Leifeld SFC 800 V500.The main objective of the study was to determine the dependence between limiting spinning coefficient, thin wall ratio coefficient and the fillet radius of forming rollers. To realize this aim required the development of an original methodology and experimental research plan. Determined relationship takes into account the occurrence of negative phenomena in the process of spinning such as wrinkling or cracking of material.Due to the possibility of prediction of these negative phenomena, determined relationship is used in the design of a metal spinning processes. On the basis on determined relationship can be done a practical assessment of the possibility of shaping with certain geometrical parameters by spinning. Obtained results were shown graphically on the diagrams and their analysis was carried.

scholarly journals Estudio de sistemas físicos reales asistido por video análisis favorece el desempeño investigativo experimental

2021 ◽  
Vol 9 (18) ◽  
pp. 1-13
Author(s):  
José Luis Abeleira Ortíz ◽  
Noelio Vázquez Vargas
Keyword(s):  
Virtual Environment ◽  
Experimental Research ◽  
Video Analysis ◽  
Statistical Processing ◽  
Experimental Investigations ◽  
Physical Systems ◽  
Learner Performance ◽  
Before And After ◽  
Research Procedure ◽  
Computer Resources

Video analysis is one of the computer resources used to develop experimental activities in the teaching of Physics. It carries particular features that enables users to examine real physical systems in a virtual environment and model the changes that take place in such real physical systems. This current research paper aimed to design and implement experimental investigations assisted by video analysis in order to enhance learner performance through the exploration of real physical systems with the aid of the systematization of an experimental research procedure. As an example, the modeling of an activity is offered which is based on the need of determining the water consumption of a real-world physical system. The methodology used consisted of assessing learner performance using different assessment activities such as pedagogical tests and observations. The statistical processing of results showed significant differences regarding learner performance comparing the learning results before and after the execution of the designed experimental activities.

scholarly journals AZOTO OKSIDŲ IR ANGLIES MONOKSIDO SKLAIDOS ATMOSFEROJE SKAITINIS MODELIAVIMAS PAGAL PHOENICS PROGRAMĄ / THE NUMERICAL MODELING OF NITROGEN OXIDES AND COAL MONOXIDE IN THE ATMOSPHERE, WHEN APPLYING PHOENICS PROGRAMME / ЧИСЛОВОЕ МОДЕЛИРОВАНИЕ РАССЕЯНИЯ В АТМОСФЕРЕ ОКИСЕЙ АЗОТА (NOX) И УГЛЕРОДА (CO) С ПОМОЩЬЮ ПРОГРАММЫ PHOENICS

2011 ◽  
Vol 19 (3) ◽  
pp. 225-233
Author(s):  
Inga Januševičienė ◽  
Zenonas Venckus
Keyword(s):  
Carbon Monoxide ◽  
Numerical Modeling ◽  
Nitrogen Oxides ◽  
Experimental Research ◽  
Pollution Source ◽  
Experimental Investigations ◽  
Wood Fire ◽  
Gauss Method ◽  
Modeling Data ◽  
Fire Wood

Atlikti eksperimentiniai tyrimai siekiant nustatyti į aplinkos ora išsiskiriančių dujų kiekius degant įvairių rūšių medienos kurui – malkoms, granulėms, briketams ir pjuvenoms. Dujų analizatoriumi Testo-350 išmatuotos degimo metu į aplinkos ora išsiskiriančių dujų – anglies monoksido (CO), azoto oksidu (NOx) koncentracijos dumuose, deguonies (O2) kiekis, taip pat dūmų temperatūra koncentracijų matavimo vietoje. Remiantis atliktais eksperimentiniais tyrimais pagal PHOENICS programa sumodeliuota anglies monoksido ir azoto oksidu koncentracijos sklaida atmosferoje iš taršos šaltinio (kamino aukštis 13 m), esant tam tikrai eksperimento metu nustatytai koncentracijai. Gauti rezultatai pateikti horizontaliojoje ir vertikaliojoje plokštumose. Atlikti teršalų emisijų pažemio koncentracijos skaičiavimai pagal banguotaja ir kūgiškaja atmosferos stabilumo formas. Gauso metodu apskaičiuoti tiriamu teršalu pažemio koncentracijų maksimumai. Modeliavimo duomenys palyginti su skaičiavimu rezultatais. Abstract An experimental research has been performed during which different kinds of wood – fire wood, granules, briquettes and sawdust – were used for defining the gas quantities emitted in the atmosphere. During the test, when applying the analyser Test-350, it was measured the concentrations of carbon monoxide (CO), nitrogen oxides (NOx) in the fumes, the quantity of oxygen (O2) and fume temperature in the measuring place. According to the performed experimental investigations (by using PHOENICS programme), the diffusion of carbon monoxide and nitrogen oxides concentration in the atmosfere from the pollution source has been modeled (the hight of the chimney was 13 m).The results are presented in horizontal and vertical planes. The lower level concentration calculating was performed by applying the wavy and conical forms of at- mospheric stability. The maxima of investigated concentrations have been found by Gauss method. The modeling data are compared with the results obtained by calculations. Резюме Проведены экспериментальные исследования, во время которых прибором Test-350 измерялись концентрации эмиссий CO и NOx, выделяемых при сжигании древесного топлива. По данным эксперимента с помощью программы PHOENICS построена модель рассеяния концентраций эмиссий CO и NOx в атмосфере из источникаэмиссии при высоте дымовой трубы в 13 м. Полученные результаты представлены в горизонтальном и вертикальном сечениях. Вычислены концентрации газовых эмиссий над поверхностью земли на разном расстоянии отместа выброса и установлены их минимумы. При вычислении максимальных надземных концентраций изучаемых эмиссий использован метод Гаусса. Проведен сравнительный анализ результатов вычислений и моделирования.

An Experimental Research of Gaseous Flow in Rough Microchannels

2011 ◽  
Vol 411 ◽  
pp. 442-446
Author(s):  
Taian Ren ◽  
Lan Chang ◽  
Jing Yun Zhao ◽  
Ge Qin
Keyword(s):  
Experimental Research ◽  
Gas Flow ◽  
Anodic Bonding ◽  
Experimental Investigations ◽  
Silicon Substrates ◽  
The Past ◽  
Mems Technology ◽  
Bonding Method ◽  
Mems Process

With the development of MEMS technology and its increasing applications in many engineering fields, the experimental research on micro-scale fluidic theory has become a spotlight topic in the past decade. In this paper, numerical and experimental investigations on the effects of roughness, compressibility and gas rarefaction on the nitrogen flow in rough microchannels had been investigated. Microchannels based on silicon substrates were fabricated by the MEMS process. Roughness surfaces of the microchannels had been obtained by KOH and TMAH solutions with different solubility etching on (100) silicon wafer. The quality of the microchannels was performed with a SEM and the measurements and the overall size of the microchannels were carried out with a step profiler. The Pyrex® 7740 and silicon wafers were packaged using the anodic bonding method. The testing platform was designed and fabricated, and checked for the gas sealing. Finally, the experimental device was constructed, and the results of gas flow in rough microchannels were measured.

SUBSTANTIATION OF THE PARAMETERS OF A HORIZONTAL CONVEYER-CLEANER OF ROOT CROPS

2021 ◽  
Vol 14(63) (1) ◽  
pp. 213-222
Author(s):  
Ihor TKACHENKO ◽  
Roman HEVKO ◽  
Мykola GANDZIUK ◽  
Sergii SYNII ◽  
Oleksandra TROKHANIAK
Keyword(s):  
Experimental Research ◽  
Experimental Investigations ◽  
Crop Loss ◽  
Process Performance ◽  
Kinematic Parameters ◽  
Minimum Loss ◽  
Sugar Beets ◽  
Root Crop ◽  
Theoretical Substantiation ◽  
Root Crops

The paper covers theoretical substantiation of the rational parameters of a horizontal conveyer-cleaner of sugar beets providing their minimum loss during process performance. The procedure of conducting experimental investigations on the developed design of a horizontal conveyer-cleaner of root crops in configuration with a root crop harvester is presented. The results of the experimental research on determining root crop loss, damage and impurity depending on the design and kinematic parameters of a cleaner are provided. In order to choose the rational parameters, specific recommendations are provided.

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