scholarly journals Determination of mechanical properties of soil under laboratory conditions

2014 ◽  
Vol 60 (Special Issue) ◽  
pp. S66-S69 ◽  
Author(s):  
V. Malý ◽  
M. Kučera
Keyword(s):  
Mechanical Properties ◽  
Penetration Depth ◽  
Measuring Device ◽  
Laboratory Conditions ◽  
Measuring Network ◽  
Set Up ◽  
Different Diameters ◽  
Different Levels ◽  
Properties Of Soil

This paper presents the mechanical properties of soil. In order to determine the properties of soil under laboratory conditions, a special measuring device was constructed, viz. a bevameter. Two types of soil with different levels of moisture were examined and their mechanical properties were determined. Measurements were taken of non-compressed soil. A measuring network was set up, consisting of measuring and recording devices. In the course of measuring, the force and penetration depth of the pressing plate were recorded simultaneously. Three different diameters of pressing plate were used, namely 38, 50 and 70 mm. The pressure on the contact area was calculated after completion of the measurements, and the relationships between pressure and penetration depth were presented graphically.

scholarly journals Laboratory Test of the Soil Compaction

2015 ◽  
Vol 63 (1) ◽  
pp. 77-85
Author(s):  
Vlastimil Malý ◽  
František Tóth ◽  
Jan Mareček ◽  
Eva Krčálová
Keyword(s):  
Mechanical Properties ◽  
Penetration Depth ◽  
Soil Compaction ◽  
Measuring Device ◽  
Special Measuring ◽  
Measuring Network ◽  
Set Up ◽  
Different Diameters ◽  
Different Levels ◽  
Properties Of Soil

This paper presents the mechanical properties of soil. In order to determine the properties of soil under laboratory conditions, we made use of a special measuring device, viz. a bevameter. Two types of soil with different levels of moisture were examined and their mechanical properties determined. Measurements were taken of non pressed and compressed soil. A measuring network was set up, consisting of measuring and recording devices. In the course of measuring, the force and penetration depth of the pressing plate were recorded simultaneously. Four different diameters of pressing plate were used, resp. 25, 38, 50 and 70 mm. The pressure on the contact area was calculated after completion of the measurements, and the relationships between pressure and penetration depth were presented graphically.

scholarly journals The use of image analysis for determination of surface deterioration level of improved alumina based materials subjected to cavitation

2013 ◽  
Vol 45 (1) ◽  
pp. 97-105 ◽  
Author(s):  
M.M. Dimitrijevic ◽  
M. Dojcinovic ◽  
A. Devecerski ◽  
R. Jancic-Heinemann ◽  
T. Volkov-Husovic
Keyword(s):  
Mechanical Properties ◽  
Mass Loss ◽  
Cavitation Erosion ◽  
Surface Erosion ◽  
Resistant Material ◽  
Good Resistance ◽  
Erosion Rates ◽  
Set Up ◽  
Different Content

Alumina based specimens having different content of alumina based fibers were investigated for possible application as cavitation resistant material. Cavitation damages of the alumina based specimens were tested by the modified vibratory cavitation set up. Erosion rates were measured based on the method developed for metallic samples, mass loss was measured during the experiment. Surface erosion was determined during the experiment simultaneously to mass loss measurements. Image Pro Plus Program was applied for surface analysis during testing. Results indicate that investigated material exhibit excellent mechanical properties and very good resistance to cavitation erosion.

Effects of the Substrate on the Determination of SEBS Thin Film Mechanical Properties by Nanoindentation

2006 ◽  
Vol 315-316 ◽  
pp. 766-769
Author(s):  
Yong Zhi Cao ◽  
Ying Chun Liang ◽  
Shen Dong ◽  
T. Sun ◽  
Bo Wang
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Polymer Film ◽  
Young’S Modulus ◽  
Penetration Depth ◽  
Young's Modulus ◽  
Polymer Film Substrate ◽  
Film Substrate ◽  
Composite Hardness

In order to investigate nanoindentation data of polymer film-substrate systems and to learn more about the mechanical properties of polymer film-substrate systems, SEBS (styreneethylene/ butylene-styrene) triblock copolymer thin film on different substrate systems have been tested with a systematic variation in penetration depth and substrate characteristics. Nanoindentation experiments were performed using a Hysitron TriboIndenter with a Berkvoich tip. The resulting data were analyzed in terms of load-displacement curves and various comparative parameters, such as hardness and Young’s modulus. The results obtained by the Oliver and Pharr method show how the composite hardness and Young’s modulus are different for different substrates and different penetration depth.

Development of the Algorithm for Determination of Mechanical Properties of Steel 20 with Different Levels of Cumulative Fatigue Damage with the Application of Compact Samples

2018 ◽  
Vol 284 ◽  
pp. 581-586 ◽  
Author(s):  
R.N. Hasanov ◽  
A.S. Valiev ◽  
I.R. Kuzeev
Keyword(s):  
Mechanical Properties ◽  
Fatigue Damage ◽  
Bending Test ◽  
Large Samples ◽  
Study Results ◽  
Impact Bending ◽  
Cumulative Fatigue Damage ◽  
Steel 20 ◽  
Different Levels

Nowadays, a change of material properties is evaluated on the basis of the results of "traditional" methods (for example, tensile testing and impact bending test). Unfortunately, "traditional" mechanical testing requires quite large samples, that leads to a damage of studied objects integrity. That is why testing with the application of compact samples, which allows converting obtained results into regular parameters, such as tensile properties and fracture resistance, was developed. Due to the novelty of this method, influence of different factors on testing results is understudied. Here arises the aim to study the influence of the level of accumulated damage on testing results. Regular changes of small punch testing tensile diagrams, depending on the number of worked out cycles, are under study in the present paper. Based on the study results, algorithm for determination of mechanical properties of steel 20 with different levels of cumulative fatigue damage with the application of compact samples was developed.

Determination of the Penetration Depth of Eddy Currents in Defectoscopic Tests

2013 ◽  
Vol 588 ◽  
pp. 64-73 ◽  
Author(s):  
Leszek Dziczkowski ◽  
Sławomir Zolkiewski
Keyword(s):  
Magnetic Field ◽  
Penetration Depth ◽  
Eddy Current ◽  
Eddy Currents ◽  
Current Method ◽  
Impedance Change ◽  
Depth Of Penetration ◽  
Eddy Current Method ◽  
Measuring Device

In the defectoscopic tests by means of the eddy currents method only a certain superficial layer of the tested element is inspected. The reason of this phenomenon is connected with a very important feature of the eddy currents. The induced eddy currents generate its own magnetic field which obstructs penetration for the primary magnetic field. It is crucial to know the penetration depth of eddy currents. It allows planning successfully the diagnosis process. There are two cases worth mentioning: when the eddy current method is treated as the additional method complementary to the ultrasound method (because it does not detect superficial defects) and when the eddy current method is used as the main method for the thin elements diagnosis. The most frequently used evaluation method of eddy currents penetration depth is connected with determination of the e-folding decrease of electric current. The definition is convenient to use because it is simplified by using in the mathematical formula (allowing determination of the depth) frequency of eddy current and conductivity of the diagnosed elements. However the simplifications are not sufficient in practice. When we change the frequency of eddy currents during the survey or the probe then the depth of penetration is also changed, then we can measure the depth of the defects. While measuring the conductivity of a proper material element it is obligatory to prepare an adequate size of the sample that is free of defects. Knowing the value of penetration depth is then very helpful. On the other hand, when we have a sample of a specified size and we want to measure its conductivity then the knowledge of the depth of penetration of eddy currents helps us to select the proper frequency. In the paper there is described a proposal of a different definition of the penetration depth of eddy current, much more useful and accurate according to the authors. To obtain much more precise results, the new eddy current method was proposed. This method takes into account not only the parameters of the diagnosed sample and the eddy current frequency but the characteristic of the measuring device as well. The above mentioned method is based on the universal mathematical model of impact of conductive thin foil on the measuring coil impedance change. The procedure of calculations is easy to carry out online.

Elastoplastic Line Contact in Cylindrical Indentation

2004 ◽  
Vol 449-452 ◽  
pp. 857-860 ◽  
Author(s):  
Hiroyuki Muto ◽  
Mototsugu Sakai
Keyword(s):  
Mechanical Properties ◽  
Penetration Depth ◽  
Point Contact ◽  
Heterogeneous Materials ◽  
Contact Length ◽  
Indentation Load ◽  
Line Contact ◽  
Indentation Method ◽  
Polycrystalline Graphite

A novel indentation method is proposed to study the mechanical properties of porous and/or heterogeneous materials by the use of a cylindrical indenter with line loading on test specimens. The problems in line contact are examined. The indentation load P versus penetration depth h relation in line contact is expressed in terms of the radius R of cylindrical indenter and the contact length L. An application of a cylindrical indentation to a polycrystalline graphite leads to a successful determination of the Young's modulus and the yielding strength. It is concluded that the line contact rather than the conventional pyramidal point contact is more efficient for the experimental deternination of mechanical properties of porous and/or heterogeneous materials.

scholarly journals Modelling of a Dynamic Torque Calibration Device and Determination of Model Parameters

ACTA IMEKO ◽  
2014 ◽  
Vol 3 (2) ◽  
pp. 14 ◽  
Author(s):  
Leonard Klaus ◽  
Thomas Bruns ◽  
Michael Kobusch
Keyword(s):  
Dynamic Behaviour ◽  
Torsional Stiffness ◽  
Model Parameters ◽  
Measuring Device ◽  
Mass Moment ◽  
Mass Moment Of Inertia ◽  
Calibration Device ◽  
Torque Transducer ◽  
Set Up

For the dynamic calibration of torque transducers, a calibration device has been developed. This paper describes the model of the measuring device and methods for the determination of its model parameters. The modelling of the calibration set-up is required for the identification of the corresponding model parameters of the torque transducer under test. These parameters describe the transducer's dynamic behaviour. Measurement methods and devices for the determination of mass moment of inertia and torsional stiffness are explained. This research is part of EMRP JRP IND09 - "Traceable Dynamic Measurement of Mechanical Quantities".

scholarly journals Characterization of calorimeter responses under laboratory conditions thanks to an optimized transient thermal test bench

2021 ◽  
Vol 253 ◽  
pp. 04017
Author(s):  
J. Rebaud ◽  
A. Volte ◽  
M. Carette ◽  
A. Lyoussi ◽  
G. Kohse ◽  
...  
Keyword(s):  
Single Cell ◽  
Test Bench ◽  
Phase Method ◽  
Specific Test ◽  
Laboratory Conditions ◽  
Transient Regimes ◽  
Set Up ◽  
Transient Thermal

This paper presents an experimental study of the calibration of a non-adiabatic single-cell calorimeter called KAROLINA. This type of sensor is used to quantify the nuclear heating rate inside MTRs (Material Testing Reactors). The calibration of this sensor type is carried out in laboratory conditions without irradiation. The calibration corresponds to a preliminary step, which is crucial to use this sensor in real conditions. In the case of the studied single-cell calorimeter owning no heating element, the calibration is realized with a specific test bench, called BERTAN, based on thermal transient regimes. First of all, the paper describes the methodology of the determination of the calorimeter sensitivity and the dedicated experimental set-up developed recently. Then the paper is devoted to a parametric study carried out on the KAROLINA single-cell calorimeter to determine the influence of several parameters on its thermal time constant (temperature, velocity, phase, method).

Variants of the design of the dentition of the anterior segments with a progenic and prognathic ratio of edentulous jaws

2021 ◽  
pp. 20-26
Author(s):  
D.I. Aksyonov ◽  
Yu.N. Mayboroda ◽  
I.N. Aksenov
Keyword(s):  
Digital Data ◽  
Mean Square ◽  
Missing Teeth ◽  
Measuring Device ◽  
Anterior Teeth ◽  
Anterior Segments ◽  
The Right ◽  
Edentulous Jaws ◽  
Different Levels

Objective: To improve the prosthetic and aesthetic treatment of patients with complete absence of teeth, taking into account the development of an algorithm for determining the size of the sagittal gap of the frontal segments against the background of a progenic or prognathic ratio of the jaws and their combinations. Methods: A method of mathematical modeling based on digital data of the distance between the tops of the alveolar ridges of the frontal areas of the edentulous jaws has been developed using a designed measuring device. Results: The results of digital calculations based on the determination of the root-mean-square deviation of the interalveolar lines revealed a different amount of bends and configurations of the interalveolar gaps and median arches common to both parts of the frontal segments. Five main variants of the interalveolar fissure and 26 cases of symmetric or asymmetric arrangement of the tops of the alveolar ridges of the right and left sides were obtained. Accordingly, the divergence angles for each pair in the projection of the missing teeth had their own characteristics, which must be taken into account when deciding on the choice of tooth placement in each specific case. Conclusions: Based on the obtained digital interpolation ratios of the interalveolar lines and the angles of their inclination in relation to the midline, the anterior teeth are placed taking into account the level of the sagittal gap, the parameters of which have different levels of symmetry or asymmetry on the right and left sides.

Sign in / Sign up

Export Citation Format

Share Document