BEARING CAPACITY OF THE SURFACE AFTER MACHINING WITH MINIMUM COOLING AND LUBRICATION

Tribologia ◽  
2018 ◽  
Vol 282 (6) ◽  
pp. 157-162
Author(s):  
Andrzej WOJCIECHOWSKI ◽  
Małgorzata SŁOMION ◽  
Maciej MATUSZEWSKI
Keyword(s):  
Bearing Capacity ◽  
Surface Structure ◽  
Negative Impact ◽  
Load Capacity ◽  
Functional Features ◽  
Cooling And Lubrication ◽  
Geometric Surface ◽  
Processing Fluid

The paper discusses the problem of surface bearing capacity and the parameters that characterize it in the context of the assessment of functional features. The result of the tests that are concerning the verification of the influence of minimal cooling and lubrication during processing on the constituted geometric surface structure described by the load capacity parameters are presented. On the basis of the obtained results, it was found that the minimum cooling and lubrication does not have a negative impact on the functional features, and they are even more advantageous than with the conventional processing fluid.

scholarly journals Assessment of friction pair elements condition based on changes in the geometric surface structure isotropicity degree

2019 ◽  
Vol 302 ◽  
pp. 01015 ◽  
Author(s):  
Maciej Matuszewski ◽  
Małgorzata Słomion ◽  
Adam Mazurkiewicz ◽  
Danil Yu. Pimenov
Keyword(s):  
Weight Loss ◽  
Surface Layer ◽  
Surface Structure ◽  
Friction Pair ◽  
Tribological Characteristics ◽  
Roughness Parameters ◽  
Functional Characteristics ◽  
Tribological Tests ◽  
Functional Features ◽  
Geometric Surface

This paper regards the possibility of using the degree of the surface isotropicity to assess the condition of the surface layer friction pair elements. The analysis is based on certain changes in operational and technological surface layer. The methods of constituting the surface layer have been characterized due to the features of geometric surface structure as well as the problem of assessing the condition of surface in terms of functional features and tribological characteristics. The evaluation of the occurring changes in the surface layer have been conducted by performing tribological tests and for descript condition of surfaces the degree of surface isotropicity and weight loss of specimens have been adopted. Whereas the assessment of technological state of the surface layer has been carried out for the surface after its coating. Based on the analysis, it has been found that the use for assessment the condition of surface layer and the degree of the surface isotropicity are useful and it is an alternative way or supplement to classical adoption of a properly selected set of roughness parameters to evaluate the potential functional characteristics of friction couples surfaces.

THE INFLUENCE OF COOLING AND LUBRICATION LIQUID QUANTITY ON THE ISOTROPY OF A MACHINE COMPONENT SURFACE DURING MACHINING

Tribologia ◽  
2016 ◽  
Vol 265 (1) ◽  
pp. 57-65
Author(s):  
Maciej MATUSZEWSKI ◽  
Jarosław MIKOŁAJCZYK ◽  
Tadeusz MIKOŁAJCZYK ◽  
Michał STYP-REKOWSKI
Keyword(s):  
Surface Structure ◽  
Geometric Structure ◽  
Machine Component ◽  
Roughness Parameters ◽  
Structure Characteristics ◽  
Cooling And Lubrication ◽  
Geometric Surface ◽  
Liquid Quantity ◽  
Lubrication Conditions

This paper presents an initial verification of the influence of a cooling- -lubrication liquid or its lack on the geometric surface structure of machine components undergoing the process of machining. It has been proposed to use the degree of isotropy of the finish surfaces, apart from commonly used roughness parameters, for the evaluation of changes in the quality of components machined in different cooling and lubrication conditions. In this study, the usefulness of the degree of isotropy for a description of the surface geometric structure characteristics has been verified.

scholarly journals ANALYSIS OF THE FIELD TESTS RESULTS OF BORED CONICAL PILES UNDER THE ACTION OF VARIOUS TYPES OF LOADS

2018 ◽  
Vol 3 (3) ◽  
pp. 24-29
Author(s):  
Ирина Рыбникова ◽  
Irina Rybnikova ◽  
Александр Рыбников ◽  
Aleksandr Rybnikov
Keyword(s):  
Bearing Capacity ◽  
Load Capacity ◽  
Normal Component ◽  
Cone Angle ◽  
Field Tests ◽  
Side Surface ◽  
Test Results ◽  
Head Diameter ◽  
Cylindrical Piles ◽  
Bored Piles

One of the methods of improving the bearing capacity of bored piles is giving them a taper. The feature of these (wedge-type) piles is that under load they work "as a thrust" and transfer part of the load due to the normal component to the inclined side surface. Three sizes of tapered bored piles were tested, with the length of 4.5 m, head diameter 0.4; 0.5; 0.6 m and with cone angle 1o and 2,5o. The test results were compared with the test results of cylindrical piles, 4.5 m long, with head diameter 0.4 m and 0.6 m. It has been discovered that with the increasing cone angle, the bearing capacity of piles against the pressing load, especially the specific load capacity for 1 m3 of material, as compared to cylindrical piles, increases significantly. It has been determined that the larger is the diameter of the head of the pile, the higher is the bearing capacity against the horizontal load, and the bearing capacity against the pullout load is equal to the breakout force of a pile from the soil.

scholarly journals Reduction of the bearing capacity of a thin-walled steel beam-column as a result of uniform corrosion

2018 ◽  
Vol 196 ◽  
pp. 01046
Author(s):  
Aniela Glinicka ◽  
Michał Maciąg
Keyword(s):  
Bearing Capacity ◽  
Load Capacity ◽  
Critical Force ◽  
Uniform Corrosion ◽  
Load Bearing Capacity ◽  
Cross Sectional ◽  
Surface Corrosion ◽  
Steel Bars ◽  
Interactive Relationship ◽  
Thin Walled

The paper presents the analysis of the load-bearing capacity of thin-walled steel bars such as beam-column. It was assumed that the rods are subject to uniformly distributed surface corrosion in the atmosphere over their entire length. As a result of corrosion, the mass loss of these rods, i.e. the thickness of the cross-sectional walls of the rod are evenly reduced. Therefore, the dependence of the critical force - the eccentricity changes. The theory of stability of thin-walled bars was used to calculate the load capacity of the rod. To calculate changes in the load capacity of the rod, an interactive relationship was used that combines compression with bending. A calculation example of the load capacity of an eccentrically compressed rod with a “C” section which has been corroded has been presented.

scholarly journals Study on Calculation of Bearing Capacity of Axially Loaded CFRP-Strengthened Cold-Formed Thin-Walled Lipped Channel Steel Columns

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Yanan Sun ◽  
Pengfei Li ◽  
Guojin Qin
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Load Capacity ◽  
Slenderness Ratio ◽  
Steel Structures ◽  
Fiber Reinforced ◽  
Bonding Agents ◽  
Steel Column ◽  
Thin Walled ◽  
Carbon Fiber Reinforced

With the development of carbon fiber reinforced composites and the continuous improvement of the properties of bonding agents, scholars recommended using carbon fiber reinforced plastics (CFRP) to enhance cold-formed thin-walled C-shaped steel structures. It can provide a fast and effective way to strengthen and repair damaged steel structures. However, discussion on the bearing capacity calculation of cold-formed thin-walled C-section steel column strengthened by CFRP was limited. Also, the relevant influencing factors (the number of CFRP reinforcement layers), the orientation of CFRP (horizontal, vertical), and the location of CFRP reinforcement (web + flanges + lips, web + flanges, web, and flanges) were overlooked in calculating the bearing capacity of cold-formed thin-walled C-section steel column strengthened by CFRP. Then, the calculation result of the load capacity will be inaccurate. This work, therefore, studied the effects of CFRP reinforcement layers, CFRP direction, and CFRP reinforcement position on the ultimate load of CFRP-strengthened cold-formed thin-walled C-section steel column. A three-dimensional (3D) finite element model of cold-formed thin-walled steel strengthened by CFRP was established to discuss the bearing capacity under axial compression. Furthermore, a method for calculating the bearing capacity of the CFRP-strengthened cold-formed thin-walled C-section steel column was proposed based on the direct strength methods (DSM). The results indicate that not only the slenderness ratio, section size, and length of members but also the number of CFRP reinforcement layers and orientation of CFRP have an impact on the calculation of bearing capacity. The equation modified in this work has excellent accuracy and adaptability. Predicting the bearing capacity of reinforced members is necessary to give full play to the performance of CFRP accurately. Thus, the methods proposed can provide a reference value for practical engineering.

Ultimate Bearing Capacity of Composition Columns Reinforced with the Prefabricated SHSCUS Filled with Steel Tubes Subjected to Axial Load

2011 ◽  
Vol 368-373 ◽  
pp. 225-229
Author(s):  
Guo Can Chen ◽  
Zhi Sheng Xu ◽  
Zhi Shuo Yang
Keyword(s):  
Bearing Capacity ◽  
Load Capacity ◽  
High Strength ◽  
Ultimate Bearing Capacity ◽  
Concrete Cover ◽  
Design Rule ◽  
Superposition Method ◽  
Steel Tubes ◽  
Ultimate Load Capacity ◽  
Concrete Type

This paper presents an experimental investigation on the short composition columns reinforced with the prefabricated super high strength concrete used stone-chop(abbreviated to SHSCUS) filled with steel tubes with 1RC as reference. The experimental parameters were the concrete type inner steel tubes, and L/D ratio, steel ratio and so on. The performance of the composition columns was investigated using different diameter-to-thickness ratio of steel tubes ranging from 15 to 26.6, and different cubic strength of 126.7, 120.3, 122.4, 134.4, 125.4, 111.4, 108.6MPa of infill concrete. The experimental results showed that concrete cover falling off was prior to specimens failure, and that the design rule, as specified in current code suitable for HSC overestimate the ultimate bearing capacity, were not suitable for the case with SHSCUS. Then the hypothesis was put forward based on experimental phenomena observed, and the formula of its ultimate load capacity was suggested based on superposition method, by which the predicted values have a good coincidence with those from the experiments.

Load-bearing capacity and characteristic forms of destruction of furniture joints made with rastex 15 and P-10 clamex fasteners

2019 ◽  
Vol 106 ◽  
pp. 38-48
Author(s):  
Maciej Sydor ◽  
PIOTR POHL
Keyword(s):  
Bearing Capacity ◽  
Load Capacity ◽  
Bending Moment ◽  
Shear Forces ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Angular Deflection ◽  
Maximal Load ◽  
Rigidity Coefficient ◽  
The Relationship

Load-bearing capacity and characteristic forms of destruction of furniture joints made with rastex 15 and P-10 clamex fasteners. The study tested the relationship between the load and angular deflection in furniture joints. The tests were carried out for two types of fasteners and five types of materials: chipboard, MDF, hardwood plywood, glued pine boards and glued oak boards. The furniture joint samples contained two fasteners preloaded only with a bending moment (without application of shear forces). The results were converted per single fastener specifying: its maximal load capacity, 50 mrad (2.9°) limit deflection and rigidity coefficient. It was found that rigidity is a better structural property of the tested joint types than their load capacity. As far as rigidity is concerned, the most durable is the combination of oak glued board – rastex 15 fastener (13.2 Nm bending moment per fastener), while the least durable combination is chipboard – clamex P-10 fastener (4.8 Nm bending moment per fastener). Photographic documentation of damaged furniture joint samples was prepared and analysed. In case of chipboard and MDF combinations (where the load is determined by the combined material), the combined boards suffer a disastrous damage, while in combinations of plywood boards and pine or oak glued boards, (where the capacity is determined by the fastener), both clamex P10 and rastex 15 fasteners are damaged.

Analytical Methods for Determination a Load Capacity of Concrete-Filled Tubes under Axial Compression

2014 ◽  
Vol 633-634 ◽  
pp. 965-971 ◽  
Author(s):  
Igor Garanzha ◽  
Nikolay Vatin
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Analytical Methods ◽  
Load Capacity ◽  
Compression Load ◽  
Composite Element ◽  
Concrete Filled Tubes ◽  
Load Calculation

In a paper are considered four existing analytical methods for determination a bearing capacity of concrete-filled tubes structures under axial compression. Analyzed approaches to the questions of a limit compression load calculation are able to withstand a composite element. Highlighted the fundamental features and similarities of discussed methods, and also their shortcomings affecting to the accuracy of the strength and stability computing results. On the particular example performed a results comparison of determination the bearing capacity by the four methods.

Paper 5: The Hydrosphere

1967 ◽  
Vol 182 (14) ◽  
pp. 33-40
Author(s):  
D. Dowson ◽  
C. M. Taylor
Keyword(s):  
Bearing Capacity ◽  
Recent Work ◽  
Load Capacity ◽  
Thermal Distortion ◽  
Approximate Analysis ◽  
Fluid Inertia ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Inertia Effects ◽  
Preliminary Examination

A preliminary examination of the bearing indicates that it is not capable of hydrodynamic action as the fluid film is parallel in the direction of motion. However, in practice it has been found that the bearing can support considerable loads. Earlier papers by the authors have examined the proposal of Shaw and Strang that the inertia of the lubricant could account for the load capacity of the bearing. This contention was rejected by the authors, and after other possible explanations had been investigated it was concluded that thermal distortion was the most likely cause of the load-bearing capacity. In this paper recent work will be reported which supports this proposal. The analysis of fluid inertia effects is summarized for a continuous hemispherical seat whose surface is disturbed only by the central lubricant supply hole (the grooveless case). The paper also presents experimental results and an approximate analysis of the thermal distortion for a hydrosphere seat with four lubricant grooves running from the supply hole to the equator along longitudinal lines.

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