scholarly journals Abrasion of Polymeric Composites on Basis of Machining Splinters from Hardfacing Alloys – Usable in Agrocomplex

2014 ◽  
Vol 62 (1) ◽  
pp. 261-266 ◽  
Author(s):  
Petr Valášek ◽  
Miroslav Müller
Keyword(s):  
Composite System ◽  
Field Tests ◽  
Functional Surface ◽  
Inorganic Particles ◽  
Composite Systems ◽  
The Matrix ◽  
Polymeric Particle ◽  
Three Body Abrasion ◽  
Three Body ◽  
Agricultural Machines

A paper focuses on a description of two-body and three-body abrasion wear of polymeric particle composites with fillers on a basis of machining splinters from hardfacing alloys. The abrasive wear is typical for functional surfaces of agricultural machines processing the soil. One of possibilities of the functional surface renovation is an application of resistant layers in a form of composite systems. Just the inclusion of hard inorganic particles into a polymeric matrix significantly increases its wear resistance. So long as the primary filler is replaced by the waste – by particles from the material machining – the matrix in which the filler is dispersed is a bearer of a material recyclation. This way of the recyclation is inexpensive, economic and sensitive to environment. The paper focuses on the experimental description of the two-body and three-body abrasion and the composites hardness, it describes a production of a prototype for field tests with the functional surface on the basis of the investigated composite system at the same time.

Thermal Expansion Behavior of the Multiphase Composite System

2004 ◽  
Vol 449-452 ◽  
pp. 765-768
Author(s):  
Chong Sung Park ◽  
Hyun Seok Hong ◽  
Myung Ho Kim ◽  
Chong Mu Lee
Keyword(s):  
Thermal Expansion ◽  
Composite System ◽  
Welding Process ◽  
High Volume ◽  
Volume Percent ◽  
New Approach ◽  
Composite Systems ◽  
Expansion Behavior ◽  
The Matrix ◽  
Multiphase Composite

A new approach for the CTE on the basis of Ashelby.s cutting and welding process was made for the analysis of the thermal expansion behaviors of Al-Si alloys and composites. In this theoretical approach, it was considered that relaxation of residual stress could create an elastoplastic zone in the matrix around a particle during cooling. A comparison of the measured CTEs with the calculated ones for the Al-Si-SiCp and Al-Si-Al2O3 composite systems was performed in terms of the volume percent and the size of reinforced phases. The calculated results revealed that the linear CTE of the both composite depends on the size of the reinforce phases, especially at the composite systems with a low volume percent of the reinforce phases. The increase in the volume percentages of Al2O3, SiCp and Si phase lowers the linear CTEs of the systems. The measured CTEs was deviated less than about ten percents from the calculated ones at composites with a high volume percent. The deviations of the CTEs of reinforced phases are about 4 - 6 vol% from real composite systems.

The electronic states of composite systems

1956 ◽  
Vol 235 (1203) ◽  
pp. 537-543 ◽  
Keyword(s):  
Density Operator ◽  
Spectroscopic Data ◽  
Composite System ◽  
Three Dimensional ◽  
Transition Density ◽  
Matrix Elements ◽  
Multipole Moments ◽  
Composite Systems ◽  
The Matrix ◽  
The Individual

In order to relate the electronic eigenstates of a composite system to those of its constituent parts one requires the matrix elements of the interaction Hamiltonian between the unperturbed states of the system . It is shown that in the absence of electron exchange these matrix elements, which are usually approximated as multipole series, may be accurately expressed as electrostatic repulsion energies between three-dimensional electric distributions localized on the subsystems. These distributions are them selves the matrix elements of the electric density operator between the eigenstates of the individual subsystems, and their multipole moments are identified as the permanent moments of the subsystems in their various states and the transition moments between these states. The name ‘transition density' is proposed for the off-diagonal elements of the electric density operator, and an examination of its properties suggests that the transition density may be a useful concept for summarizing and systematizing spectroscopic data on atomic and molecular assemblies.

scholarly journals Wear and Frictional Behaviour of Metals

2014 ◽  
Vol 893 ◽  
pp. 430-435
Author(s):  
J.G. Alotaibi ◽  
B.F. Yousif ◽  
T.F. Yusaf
Keyword(s):  
Stainless Steel ◽  
Thermal Loading ◽  
Operating Parameters ◽  
Thermal Imager ◽  
Contact Conditions ◽  
Dry Contact ◽  
Three Body Abrasion ◽  
Three Body ◽  
Worn Surface ◽  
Frictional Behaviour

In the current study, wear and frictional performances of different metals are investigated under different operating parameters against stainless steel counterface under dry contact conditions. The experiments performed using block on ring machine. Microscopy was used to examine the damage features on the worn surface and categorize the wear mechanism. Thermal imager was used to understand the thermal loading in the interface during the rubbing process. The results revealed that the operating parameters influence the wear and frictional behaviour of all the metals. Brass metal exhibited better wear and frictional behaviour compared to others. Three different wear mechanisms were observed, i.e. two body abrasion (Brass), three body abrasion (Aluminium) and adhesive (Mild Steel).

Movement patterns of abrasive particles in three-body abrasion

Wear ◽  
1993 ◽  
Vol 162-164 ◽  
pp. 782-789 ◽  
Author(s):  
L. Fang ◽  
X.L. Kong ◽  
J.Y. Su ◽  
Q.D. Zhou
Keyword(s):  
Movement Patterns ◽  
Abrasive Particles ◽  
Three Body Abrasion ◽  
Three Body

The Analysis and Synthesis of Vibrating Systems

1954 ◽  
Vol 58 (526) ◽  
pp. 703-719 ◽  
Author(s):  
R. E. D. Bishop
Keyword(s):  
Composite System ◽  
Frequency Equation ◽  
Computational Effort ◽  
Analytical Treatment ◽  
Principal Mode ◽  
Oscillatory Systems ◽  
Composite Systems ◽  
Analysis And Synthesis ◽  
Simple Systems ◽  
Vibrating Systems

SummaryComplicated oscillatory systems may be broken down into component “ sub-systems ” for the purpose of vibration analysis. These will generally submit more readily to analytical treatment. After an introduction to the concept of receptance, the principles underlying this form of analysis are reviewed.The dynamical properties of simple systems (in the form of their receptances) may be tabulated. By this means the properties of a complicated system may be found by first analysing it into convenient sub-systems and then extracting the properties of the latter from a suitable table. A catalogue of this sort is given for the particular case of conservative torsional systems with finite freedom.The properties of the composite system which may be readily found in this way are (i) its receptances and (ii) its frequency equation. Tables are given of expressions for these in terms of the receptances of the component sub-systems. All of the tables may easily be extended. The tabulated receptances may also be used for determining relative displacements during free vibration in any principal mode.A method of presenting information on the vibration characteristics of machinery, which is effectively due to Carter, is illustrated by means of an example. More general adoption by manufacturers of this method (which requires no more computational effort than must normally be made) would lead to enormous savings of labour in calculating natural frequencies of composite systems.

scholarly journals Improving the performance of a ploughing tractor by means of an auxiliary carriage with motorized axle

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
Volodymyr Bulgakov ◽  
Volodymyr Nadykto ◽  
Semjons Ivanovs ◽  
Ilmars Dukulis
Keyword(s):  
Field Tests ◽  
Working Process ◽  
Wheel Drive ◽  
Analysis Of Results ◽  
Saddle Type ◽  
Draft Resistance ◽  
The Right ◽  
Technological Module ◽  
Agricultural Machines ◽  
Ploughing Depth

The article describes the analysis of results from field tests on ploughing units based on a modular draft device (MDD). This device is named MDD-100 and consists of an energy module and a technological module. The energy module is a universal tractor with a rated draft resistance of 16 kN. The technological module is an additional axle, equipped with an active wheel drive, a threepoint hitch linkage, and a saddle-type semi-trailer. During the working process, the draft resistance of the energy and the technological modules of the MDD-100 add up. As a result, the draft resistance of the latter may reach 26 kN, and more. This allows the MDD-100 to be classified as a draft device in traction class 3 and be used with agricultural machines with a large working width. The MDD-100 was tested with a five-bottom mounted plough with a working width of 1.75 m and a draft resistance of 24-28 kN. The best option for driving the MDD-100 with a plough was its movement with the right-side wheels in the furrow. The draft resistance of the plough would decrease by 12.0%, if the option of the MDD-100 outside the furrow is used. This ensured a 12.8% reduction in the skidding of the MDD-100 wheels and a 13.1% decrease of fuel consumption for the ploughing unit. Compared to a 4WD tractor, the use of a modular draft device with a 6WD wheel arrangement offered a greater stability of the ploughing depth.

scholarly journals Modelling of Grain Motion for Three-body Abrasion

Procedia CIRP ◽  
2015 ◽  
Vol 31 ◽  
pp. 282-286 ◽  
Author(s):  
I. Loresch ◽  
O. Riemer
Keyword(s):  
Three Body Abrasion ◽  
Three Body

Role of the Lubricant in Three-body Abrasion

Nature ◽  
1970 ◽  
Vol 226 (5244) ◽  
pp. 446-447 ◽  
Author(s):  
C. PRITCHARD
Keyword(s):  
Three Body Abrasion ◽  
Three Body

Sliding wear behavior of plasma sprayed 65% (NiCrSiFeBC)–35% (WC–Co) coating at elevated temperatures

2019 ◽  
Vol 234 (9) ◽  
pp. 1396-1415
Author(s):  
Gagandeep Singh ◽  
Manpreet Kaur
Keyword(s):  
Elevated Temperatures ◽  
Wear Behavior ◽  
Atmospheric Plasma ◽  
Hot Forming ◽  
Lower Porosity ◽  
Pin On Disc ◽  
Aisi H13 ◽  
Three Body Abrasion ◽  
Three Body ◽  
Plasma Sprayed

Knowledge and optimization of tribological behavior of hot forming dies play an important role in attaining high process productivity. But research in this field has been limited. Keeping this in view, the current investigation aims to explore the potential of atmospheric plasma sprayed (APS) 65% (NiCrSiFeBC)–35% (WC–Co) coating in optimizing friction coefficients and minimizing the wear of AISI H11 and AISI H13 hot forming steels at elevated temperatures. Detailed characterization of the as-sprayed specimens was carried out using scanning electron microscopy/energy-dispersive spectroscopy and X-ray diffraction techniques. Wear and friction tests were done utilizing a high-temperature pin-on-disc tribometer under two different loads and temperatures ranging from room temperature to 800 ℃. The results have shown that the developed coating exhibited lower porosity, higher microhardness, and performed much better than the uncoated specimens. The wear mechanisms of the coated specimens were mainly abrasive at room temperatures and 400 ℃. Fatigue, tribo-oxidation, and three-body abrasion were observed as the dominant mechanisms at 800 ℃.

Thermal Expansion of Composite System Epoxy Resin/Recycled Carbon Fibers

2020 ◽  
Vol 994 ◽  
pp. 162-169
Author(s):  
Štěpánka Dvořáčková ◽  
Dora Kroisová
Keyword(s):  
Experimental Study ◽  
Thermal Expansion ◽  
Epoxy Resin ◽  
Carbon Fibers ◽  
Composite System ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Carbon Fibres ◽  
Sample Matrix ◽  
Composite Systems

This experimental study deals with the problematics of thermal expansion α [10-6/K] of the composite systems based on recycled carbon fibres reinforced epoxy resin. The epoxy resin CHS – EPOXY 520 (EPOXY 15), cured with the hardener P11 (Districhem, s.r.o.), was chosen as a sample matrix. Recycled carbon fibres with a diameter of 7 μm and a length of 100 μm (Easy Composites Ltd.) were the filler. In the experiment, samples with the fulfilment of 10, 20, 40, 60, 80, 90 and 100 phr were prepared. The samples were being poured into silicone molds, cured at an overpressure of 0.7 MPa and a temperature of 23 ± 2 °C for 24 hours. A thermomechanical analyzer was used to determine the thermal expansion of composite systems. The addition of recycled carbon fibers to epoxy resin can reduce the coefficient of linear thermal expansion at 20°C in half, from the original α = 45 to 55 × 10-6/K for non-filled epoxy resin to α = 25 to 27 × 10-6/K for filled epoxy resin. Optimal filling is at the level of 40 phr, with higher filling there is no further reduction of the linear thermal expansion coefficient.

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