scholarly journals Assessment of Irradiation Performance in the Jules Horowitz Reactor (JHR) using the CARMEN Measuring Device

2021 ◽  
Vol 253 ◽  
pp. 04010
Author(s):  
David Blanchet ◽  
Muriel Antony ◽  
Hubert Carcreff ◽  
Sébastien François ◽  
Philippe Guimbal ◽  
...  
Keyword(s):  
Experimental Validation ◽  
Material Testing ◽  
Irradiation Temperature ◽  
Thermal Gradients ◽  
Measuring Device ◽  
Thermal Fields ◽  
Nuclear Heating ◽  
Irradiation Performance ◽  
Technological Limitations

The development of the JHR experimental devices rely on the operational feedback from previous French material testing reactors (i.e. SILOE and OSIRIS). The experimental devices used for the irradiation of structural material were already facing technological limitations, in particular regarding the control of irradiation temperature and of the thermal gradients in the experimental samples, which is essential to ensure the quality of the experiments. Obtaining satisfactory thermal fields (in compliance with the setpoint and the homogeneity) is all the more difficult as the level of nuclear heating is higher in the JHR. This paper attempts to characterize the irradiation conditions in different experimental positions of the JHR and to compare them with the conditions and the empirical criteria of maximum acceptable temperature measured in OSIRIS. The study shows that the irradiation conditions obtained inside the experimental devices can sometimes be significantly different from the measured conditions using instrumentation devices. The interpretation of the experimental results and their transposition to other situations will always require a calculation versus measurement adjustment and the intensive use of computer simulation. However, despite all simulation and transposition efforts, the control of temperature conditions is not yet fully demonstrated and nothing will ultimately replace experimental validation.

scholarly journals A Parametric Study of the Vacuum Arc Remelting (VAR) Process: Effects of Arc Radius, Side-Arcing, and Gas Cooling

2019 ◽  
Vol 51 (1) ◽  
pp. 222-235 ◽  
Author(s):  
E. Karimi-Sibaki ◽  
A. Kharicha ◽  
M. Wu ◽  
A. Ludwig ◽  
J. Bohacek
Keyword(s):  
Molten Pool ◽  
Vacuum Arc ◽  
Internal Quality ◽  
Solidification Behavior ◽  
Vacuum Arc Remelting ◽  
Thermal Fields ◽  
Vacuum Plasma ◽  
Process Effects ◽  
Gas Cooling

Abstract Main modeling challenges for vacuum arc remelting (VAR) are briefly highlighted concerning various involving phenomena during the process such as formation and movement of cathode spots on the surface of electrode, the vacuum plasma, side-arcing, the thermal radiation in the vacuum region, magnetohydrodynamics (MHD) in the molten pool, melting of the electrode, and solidification of the ingot. A numerical model is proposed to investigate the influence of several decisive parameters such as arc mode (diffusive or constricted), amount of side-arcing, and gas cooling of shrinkage gap at mold–ingot interface on the solidification behavior of a Titanium-based (Ti-6Al-4V) VAR ingot. The electromagnetic and thermal fields are solved in the entire system including the electrode, vacuum plasma, ingot, and mold. The flow field in the molten pool and the solidification pool profile are computed. The depth of molten pool decreases as the radius of arc increases. With the decreasing amount of side-arcing, the depth of the molten pool increases. Furthermore, gas cooling fairly improves the internal quality of ingot (shallow pool depth) without affecting hydrodynamics in the molten pool. Modeling results are validated against an experiment.

scholarly journals Research into special technological effects for formation of wear resistant coatings using mineral raw materials of the far eastern region

2018 ◽  
Vol 56 ◽  
pp. 03027
Author(s):  
Viktor Makienko ◽  
Igor Romanov ◽  
Pavel Sokolov ◽  
Alexander Atenyaev ◽  
Dmitry Pervakov
Keyword(s):  
Mechanical Properties ◽  
Raw Materials ◽  
Experimental Studies ◽  
Eastern Region ◽  
Mineral Raw Materials ◽  
Wear Resistant Coatings ◽  
Thermal Fields ◽  
Additional Influence ◽  
Far Eastern

The results of the study of the possibility of using additional technological influence in the formation of doped coatings are presented. The distribution of thermal fields has been calculated, which makes it possible to estimate and predict the influence of additional influence on the formation of the coating in a simplified manner. Experimental studies have shown that additional technological influence promotes mixing of the melt, leading to an increase in the transition of alloying elements, as well as an increase in the mechanical properties and quality of the weld metal.

Thermo Mechanical Modeling of Selective Inhibition Sintered Thermoplastic Parts

2015 ◽  
Vol 813-814 ◽  
pp. 791-795 ◽  
Author(s):  
P. Arunkumar ◽  
Esakki Balasubramanian ◽  
U. Chandrasekhar
Keyword(s):  
Selective Inhibition ◽  
Spot Size ◽  
Powdered Material ◽  
Thin Layers ◽  
Digital Data ◽  
Thermal Gradients ◽  
Selective Inhibition Sintering ◽  
Engineering Organizations ◽  
Near Net Shape

Contemporary product design and development efforts of various engineering organizations have experienced the emergence of Additive Manufacturing (AM) or 3D printing technology as a competent fabrication option for converting digital data into physical parts without using part-specific tools or fixtures. This paper presents the results of coupled field structural thermal analysis carried out on an innovative variant of AM technology called selective inhibition sintering wherein near net shape parts are fabricated through sintering of thin layers of powdered material while inhibiting the boundaries. Thermal gradients that are inherent to the process cause significant residual stresses affecting the part stability. Hence this study evaluates the effect of layer thickness and heater spot size on temperature gradient, displacement and thermal stress of two different polymers is assessed by numerical analysis. Results of the current study are relevant to enhancing the quality of sintered polymer parts with reference to dimensional fidelity and stability.

Applied Non-Destructive Tests to Synthetically Investigate the Bearing Capacity Loss of Pavement

2013 ◽  
Vol 723 ◽  
pp. 27-34
Author(s):  
Han Yi Wang ◽  
Hung Wei Wu ◽  
Ruei Hung Shiu ◽  
Jyh Dong Lin
Keyword(s):  
Material Testing ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Renewable Materials ◽  
Standard Material ◽  
The Road ◽  
Road Pavement ◽  
Pavement Structure ◽  
Non Destructive

This study was set out to analyze and investigate the damaged surface course of a newly-constructed road pavement within the two years after its completion. Because the idea of sustainable public infrastructure in Taiwan has recently encouraged the use of renewable materials in the design phase, parts of this roads pavement structure is composed of recycled asphalt concrete, renewable agents, disposed construction surplus and the like. Considering the complex relationship between the damaged condition of the road pavement and factors such as its load repetitions, its design, its construction process and management, and road management, this study employed an intelligent vehicle for pavement survey, Benkelman Beam method, GeoGauge, and Ground Penetrating Radar to examine the roads pavement structure. After cross-analyzing the results from the non-destructive testing, certain parts of the road and the possibly-damaged structure of the pavement were sampled for material testing. The results from the material testing indicated that the related mechanical parameters of the road sections sampled by the non-destructive testing were significantly lower than the normal standards. Moreover, the results from the GPR analysis revealed that the water content of the subgrade of the severely-damaged road sections was high. The low loading capacity of the pavement structure was mainly due to the high groundwater water level in the surrounding area and the penetration of the rain into the cracks of the surface course. This study proposes that nondestructive testing can facilitate sampling sections for material testing to better ensure the quality of the construction although random sampling is commonly seen in the standard material testing for acceptance of completed work. In addition, the study suggests that non-destructive testing can be one requirement for the acceptance of completed work in pavement projects with renewable materials to better evaluate the quality of the pavement after its construction.

The Importance of a Fan Location in the Front Door in Measuring of the Air Permeability by the Blower Door Test

2013 ◽  
Vol 649 ◽  
pp. 125-128 ◽  
Author(s):  
Barbora Hrubá ◽  
Marcela Černíková ◽  
Lucie Kucerova ◽  
Lubomír Martiník
Keyword(s):  
Energy Efficient ◽  
Evaluation Criteria ◽  
Air Permeability ◽  
Building Envelope ◽  
Measuring Device ◽  
Front Door ◽  
Energy Efficient Buildings ◽  
Timber Construction ◽  
Weak Part

The value of air permeability, or the value of n50 provides important information about the impermeability of the building envelope and thus the quality of internal environment of the building. It is also one of the main evaluation criteria in classifying energy efficient buildings. Air permeability is determined by Blower Door Test where the fan blows air in or out from the measured area. The measurement is performed in a overpressure and afterwards in a underpressure during which the leaks are detected. The frame is usually placed into the front door which themselves is a weak part in the building envelope, and thus the rate of leakage completely denies. The effect of leakage of the front door is so significant that it can often cause a misclassification of the energy efficient buildings. We have tested this hypothesis by Blower Door Test on a passive timber construction build in 2007 during which we have measured the object in position of measuring device placed in the front door and the balcony door that are not encumbered by leaks caused by a security hardware and by other specific elements

scholarly journals Pengembangan Alat Peraga Pengukur Debit Air Menggunakan Sensor Flow Berbasis Arduino Sebagai Media Pembelajaran Fluida

2019 ◽  
Vol 12 (1) ◽  
pp. 38-45
Author(s):  
Fita Tri Wahyuningsih ◽  
Yusro Al Hakim ◽  
Ashari Ashari
Keyword(s):  
Physics Education ◽  
Water Discharge ◽  
Measurement Data ◽  
Flow Sensor ◽  
Measuring Instrument ◽  
Research Subjects ◽  
Measuring Device ◽  
Average Percentage ◽  
Teaching Aids

Research has been carried out on the development of teaching aid for measuring water debit using an Arduino based flow sensor as a medium of fluid learning in order to determine the feasibility of a water discharge measuring instrument developed as a fluid learning media. This research is development research consisting of the stages of data collection, product design, design validity, design revision, limited trials. The research subjects for the limited trial were the 4th-semester students of the Physics Education Study Program, Muhammadiyah University Purworejo with 19 students. The product developed is a water discharge measuring device that uses an Arduino-based flow sensor as a fluid learning media through the validation stage by experts. Furthermore, the product is revised and limited to trial. From the results of the trial of the tool carried out the Water Discharge Gauge using an Arduino-based Flow Sensor obtained a debit of (3.80 ± 0.13) liters/minute. While the data from the test results taken manually were debit at (3.55 ± 0.31) liters/min. With a relative error that is very small, with a comparison of sensor and manual measurement data on water discharge of 3.40%. This shows the value of the measurement accuracy is very good. From the results of the validation carried out by the validator namely expert lecturers and peers, it was found that the quality of the teaching aids was included in the excellent category with an average percentage of 76% and the quality of the guidebook was included in the excellent category with an average percentage gain of 78%. A limited trial was conducted by conducting a practicum using a water discharge measuring instrument using an Arduino-based flow sensor, then the results of the student questionnaire responses resulted in a percentage value of 87.22% with very good criteria. Thus the Water Discharge Measuring Tool using Arduino Based Flow Sensors is feasible to be used in Fluid material experiments.

scholarly journals The Comparison of Retention between Hot Curing and Fluid Denture Base Acrylic Resin (In Vivo)

2018 ◽  
Vol 2 (2) ◽  
pp. 150-161
Author(s):  
Bestun Akram ◽  
Rizgar Hasan
Keyword(s):  
Base Material ◽  
Acrylic Resin ◽  
Basic Requirement ◽  
Denture Base ◽  
Measuring Device ◽  
Base Materials ◽  
Heat Cure ◽  
Male Patients

Adequate retention is a basic requirement for the acceptance of complete denture. The aim of this study was to evaluate the retention quality of fluid denture base materials and compare it with conventional acrylic denture base materials Method: Sixteen edentulous male patients with an age 45-60 years participated in the study. For each patient two denture bases were constructed, one of them made from fluid denture base materials and the other made from hot acrylic denture base materials. A specially designed strain gauge measuring device was used to measure the force required to dislodge the two dentures from basal seats. Six measurements of retention of newly inserted denture base were recorded for each patient (three for maxillary acrylic denture base and three for maxillary fluid denture base). Results: The results of the retention test showed that the fluid denture base materials required more force in order to dislodge denture than the heat cure denture base materials, which means a significant improvement in retention quality obtained by fluid denture base materials. Conclusions: It has appeared that the fluid acrylic denture base materials produce denture base material with excellent retentive efficiency to the underlying tissue when compared to conventional denture base materials.

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