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Wyświetlanie 1-15 z 123
Tytuł:
Technological Forecasting of Deformations in Flat Parts
Autorzy:
Ivanova, Tatiana N.
Biały, Witold
Fries, Jiri
Nordin, Victor
Powiązania:
https://bibliotekanauki.pl/articles/2064652.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
deformation
state stress
stress diagram
residual stresses
stress formation
grinding
Opis:
The deformation of a part occurring in the process of grinding directly influences its exploitation and quality parameters. The instability of shape and size, which occurs due to an imbalance of residual stress, can be the one of the major causes of deformation of a part. The decrease in stress slows down the deformation process. Considering the regularities of heat source intensity dependence on the grinding modes, it can be asserted that with increasing grinding depth and grinding wheel hardness, the value increases and it decreases with a growth in a speed of the part and the use of cooling. The higher the heat removal is and the better lubricant properties of the liquid are, the more significant the decrease in is. Changing these values allows regulation of the residual stresses. As a result of the research on determination of deformations, it is recommended to reduce thermal deformations by considering the geometric size of a plate to be machined, linear expansion coefficient of plate material and an allowance for nonflatness from thermal deformations. The value of nonflatness from thermal deformations is directly proportional to linear expansion coefficient of plate material and its square overall dimensions. At the same time, the value of nonflatness is inversely proportional to the plate thickness.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 1--12
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocenka deformirujemosti zagotovok v processe valcovki
Estimation of deformability billets during rolling
Autorzy:
Gun'ko, I.
Dobranuk, Y.
Powiązania:
https://bibliotekanauki.pl/articles/78062.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
stress-strain state
cylindrical billet
stress state parameter
deformability
rolling
trajectory deformation
Opis:
Forming analyzed and solved the problem of determining the stress-strain state of a cylindrical billet during rolling using simulation in the software package DEFORM 3D. Patterns of forming and distribution of the accumulated damages to the billet during deformation is received. A study of dangerous, in terms of damage accumulation, points billet is performed. For this it was constructed and analyzed the trajectory of deformation at these points of the billet.
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 4
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complete solution for the saturated slopes in the limit stress state
Autorzy:
Batog, A.
Stilger-Szydło, E.
Powiązania:
https://bibliotekanauki.pl/articles/241498.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
saturated slopes
limit stress state
Opis:
Complete solutions of saturated slopes in the limit state, in the aspects of statics and kinematics, are presented. The proposed methods can be applied to the calculation of stress fields and velocity fields and the esti-mation of the limit load for two basic (associated and non-associated with linear Mohr-Coulomb yield condition) flow rules. Samples of calcu-lations for diverse saturation conditions appeared in slopes are included. The proposed methods will contribute to the extension of the use of limit state methods in engineering practice.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2003, 50, 2; 85-106
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous drill-core parting in the sediments of the Upper Silesian basin
Autorzy:
Kožušníková, A.
Fialová, V.
Hoch, I.
Powiązania:
https://bibliotekanauki.pl/articles/191518.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
core
anomalous parting
stress state
Opis:
Anomalous jointing of drillcores is sometimes observed in prospect boreholes in the Upper Silesian basin. The drillcore is jointed into discs, slices or porringers that are not resemblant to natural jointing. This occurs in various types of sediments, but especially in brittle rocks. Orientation of jointing planes is perpendicular to the borehole axis and does not depend on the distance from the front of the core run. Anomalous jointing reflects locally increased stress in the layer.
Źródło:
Annales Societatis Geologorum Poloniae; 2003, 73, No 2; 139-143
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEM simulation of the tube rolling process in Diescher’s mill
Autorzy:
Pater, Z.
Tofil, A.
Powiązania:
https://bibliotekanauki.pl/articles/102656.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
tube rolling
FEM
state of stress and strain
Opis:
This paper deals with the issue of numerical modelling of the piercing process of a thick–walled bush in a two-rolled skew rolling mill, equipped with guiding devices of Diescher’s type. After a short characteristic of the subject matter, the developed geometric model of the process was discussed, with taking kinematics of tools movement and thermal phenomena present in metal during forming into consideration. Next, the results of calculations were presented in a form of fields of strain, damage criterion and temperature. Distributions of force parameters acting on particular tools during the process of bush rolling were also given.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 22; 51-55
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some aspects of dynamic riveting simulations
Autorzy:
Szymczyk, E.
Jachimowicz, J.
Puchała, K.
Powiązania:
https://bibliotekanauki.pl/articles/248006.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
riveting
dynamic simulation
residual stress state
Opis:
Riveting is a commonly used (especially in aircraft structures) method of joining metal and composite components. The methods of forming solid shank rivets can be classified in two types: static and dynamic. The static method is the most efficient one. Regrettably, its application is limited. A popular upsetting tool used in an aircraft is a pneumatic riveter. The rivet driving requires a few hammer strokes. The total stress in a riveted joint depends on the residual and applied stress. Residual post-riveting stress fields are widely accepted to have a beneficial influence on the fatigue life of aircraft structures. The analysis is carried out for a solid mushroom rivet (made of PA25 alloy) joining two sheets (made of 2024T3 alloy). Nonlinear dynamic simulations of the upsetting process are carried out. Simulation of the riveting process is significantly influenced by a material model. The numerical calculations are performed for three different cases of upsetting described by the formed rivet head diameters 1.4d, 1.5d and 1.6d, respectively. The rivet head diameter and, consequently, the residual stress state depend on hammer stroke energy. It has a significant influence on a plastic region around the rivet hole, whereas the influence of a number of strokes can be neglected. The strain rate in both local and global (average) formulation is analysed in the paper. For one hammer stroke, the global strain rate of the rivet shank is about 1.0 thousand per second. The local strain rate is about two times greater than the global one, so a strain rate factor has an effect on the residual stress state. For a few hammer strokes, the strain rate is lower than for one stroke; however, it increases a little in each stroke. The hole deformation can be treated as a function of the internal energy of the sheet. The lower total energy of the part the greater influence of the strain rate on the internal energy is observed.
Źródło:
Journal of KONES; 2012, 19, 1; 423-430
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic stress concentration at the boundary of an incision at the plate under the action of weak shock waves
Autorzy:
Mikulich, O.
Shvabyuk, V.
Sulym, H.
Powiązania:
https://bibliotekanauki.pl/articles/386957.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
stress state
plate
incision
weak shock wave
Opis:
This paper proposes the novel technique for analysis of dynamic stress state of multi-connected infinite plates under the action of weak shock waves. For solution of the problem it uses the integral and discrete Fourier transforms. Calculation of transformed dynamic stresses at the incisions of plates is held using the boundary-integral equation method and the theory of complex variable functions. The numerical implementation of the developed algorithm is based on the method of mechanical quadratures and collocation technique. For calculation of originals of the dynamic stresses it uses modified discrete Fourier transform. The algorithm is effective in the analysis of the dynamic stress state of defective plates.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 3; 217-221
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Локальная устой чйвость плоскйх многограннйков сетчатых куполов
Local stability of flat polyhedrons of mesh domes
Autorzy:
ДРАГАН, В. И.
ГЛУШКО, К. К
Powiązania:
https://bibliotekanauki.pl/articles/1203945.pdf
Data publikacji:
2016
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
stress-strain state
fragment
mesh dome
Opis:
The dependences for determining the stress-strain state of a fragment of a mesh dome. These formulas are valid for the case of constant-largest hub load on a mesh dome. Experimentally determined tense and strained state of the dome fragment. The proposed method has a good agreement with the experimental results.
Źródło:
Modern Engineering; 2016, 1; 82-93
2450-5501
Pojawia się w:
Modern Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of the stress-strain state of a rope strand with linear contact under tension and torsion loading conditions
Autorzy:
Kalentev, E.
Václav, S.
Božek, P.
Tarasov, V.
Korshunov, A.
Powiązania:
https://bibliotekanauki.pl/articles/102692.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
numerical analysis
stress-strain state
rope
Opis:
The paper presents the results of a numerical analysis of the stress-strain state of a rope strand with linear contact under tension and torsion loading conditions. Calculations are carried out using the ANSYS software package. Different approaches to calculation of the stress-strain state of ropes are reviewed, and their advantages and deficiencies are considered. The analysis of the obtained results leads us to the conclusion that the proposed method can be used in engineering calculations.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 2; 231-239
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of 3D printing technology in the aviation industry on an example of numerical experimental stress state analysis of unmanned aerial vehicle wing
Autorzy:
Święch, Ł.
Bendarz, A.
Powiązania:
https://bibliotekanauki.pl/articles/246287.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
DIC
3d printing
FFF
stress state
UAV
Opis:
The article presents the results of static tests performed on the primary support structures of a TWISST-ter unmanned aircraft constructed using additive manufacturing techniques commonly known as 3D printing. The primary goal of the experiment was determining the material effort of the structure in order to assess the feasibility of such an engineering solution in terms of material mechanics. Considering the fact that the properties of 3D printed elements are not widely known, both destructive experimental methods and finite element methods were used. During the experimental trails, the ARAMIS deformation measurement system, based on digital three-dimensional image correlation, was used. The results of this experiment allowed for the calibration of the numerical model as achieving convergence with experimentally determined strain fields. This approach ensured the correctness of the numerical determined stress state. Based on the results of the study, the necessary design improvements were implemented and a general conclusion was formed regarding of the numerical analysis of structures made through 3D printing.
Źródło:
Journal of KONES; 2017, 24, 4; 327-334
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of impulse load influence on the stress state of foam materials with positive and negative poisson’s ratio
Autorzy:
Sulym, Heorhiy
Mikulich, Olena
Shvabyuk, Vasyl
Powiązania:
https://bibliotekanauki.pl/articles/387508.pdf
Data publikacji:
2020
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
stress state
foam
poisson’s ratio
cosserat elasticity
Opis:
The influence of impulse load applied for different duration on the distribution of normalised dynamic radial stresses in positive and negative Poisson’s ratio medium was investigated in this study. For solving the non-stationary problem in the case of plane deformation for structurally inhomogeneous materials, the model of Cosserat continuum was applied. This model enables accounting for the influence of shear-rotation deformation of micro-particles of the medium. In the framework of Cosserat elasticity, on applying the Fourier transforms for time variable and developing the boundary integral equation method, solving of the non-stationary problem reduces to the system of singular integral equations, where the components that determine the influence of shear-rotation deformations are selected. The numerical calculations were performed for the foam medium with positive and negative Poisson’s ratio for different values of time duration of impulse. Developed approach can be used to predict the mechanical behaviour of foam auxetic materials obtained at different values of a volumetric compression ratio under the action of time variable load based on analysis of the dis-tribution of radial stresses in foam medium.
Źródło:
Acta Mechanica et Automatica; 2020, 14, 2; 79-83
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Description of strength of wood composite in compound state of load
Autorzy:
Kyzioł, L.
Powiązania:
https://bibliotekanauki.pl/articles/950148.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
compound state of stress
modified wood
effort criterion
strengthening of the material
Opis:
All constructions are subject to the most compound loads and therefore a suitable effort hypothesis should be used for their calculation. For anisotropic materials, a hypothesis should be used to describe the properties of such materials. In the work have been shown the strength of the layers composite on the example of construction wood in a compound stress state. Wood composite is an orthotropic material. Wood is composed of alternating layers of soft wood and hard wood. Single layers are monotropic material. The use of a stress hypothesis, which describes the strength of an orthotropic material, requires will make an investigation. Studies is purposed to determine the tensile strength along and across the fibres. The compressive strengths along and across the fibres and the shear strength. Particularly the determination of shear strength requires special tooling so that in the case of flat samples in the measuring part it is possible to determine the shear stresses. Therefore, a research stand was designed and constructed. Known stress hypotheses for anisotropic materials have been analysed. The analysis showed that the strength of the wood composite could be described by the Tai-Wu stress hypothesis. Based on the results of the research, numerical calculations were performed. Calculations allowed determining the distribution of stresses in the sample measuring part. The results tests and numerical calculations have shown that obtaining a homogeneous stress (shear) condition for anisotropic materials is very difficult. Wood belongs to materials whose mechanical properties depend on many parameters, so the description of the effort of this material is a compound issue. Studies have shown that wood reinforcement by polymer saturation is best suited to the compressed loaded structures.
Źródło:
Journal of KONES; 2017, 24, 3; 161-165
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of stress state based on well logging data and laboratory easurements – a CBM well in the southeastern part of the Upper Silesian Coal Basin (Poland)
Autorzy:
Kępiński, Michał
Powiązania:
https://bibliotekanauki.pl/articles/184365.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Mechanical Earth Model
Upper Silesian Coal Basin
stress state
Opis:
The main objective of this study is to present calculation methods of horizontal stress profiles, taking into account the stress boundaries model, poro-elastic horizontal strain model and the effective stress ratio approach, using calibration with wellbore failure. The mechanical earth model (MEM) parameters from log measurements and well testing data were estimated for a well located in the southeastern part of the Upper Silesian Coal Basin. Log-derived horizontal stresses of the well are commonly treated as the final product of geomechanical modeling in oil and gas practices. A less popular method for estimating horizontal stresses is based on Kirsch equations juxtaposed with compressional and tensile failure observed on a micro-imager or six-arm caliper. Using this approach, horizontal stresses are determined based on the fact that when hoop stresses exceed the formation’s tensile strength, tensile fractures are created, and when those stresses exceed the compressive strength of the formation, breakouts can be identified. The advantage of this method is that it can be run without in situ stress measurements. The presented workflow is recommended every time there is an image log and dipole sonic measurement in the available dataset, both being necessary to observe the failure zones and MEM.
Źródło:
Geology, Geophysics and Environment; 2020, 46, 2; 77-92
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Partial cases of stressed-deformed condition of casing and pump compressor pipes
Autorzy:
Vasylyshyn, Vitalii
Taras, Iryna
Bekish, Iryna
Kornuta, Olena
Kornuta, Volodymyr
Powiązania:
https://bibliotekanauki.pl/articles/409894.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
tubing
stress-strain state
fatigue life
tightening torque
Opis:
Threaded joints are the most technological for piling up in the fields. However, violations of standard threaded joints account for 70% of all complications in pipe processing and production. These malfunctions result in significant material losses, reduced well productivity, and contamination of the wells and environmental pollution. Particularly acute is the loss of these sealed joints during exploration and development of gas and gas condensate fields. The necessary increase in volumes and intensification of hydrocarbon energy production is envisaged by the increase of drilling depth, construction of slopes and horizontal wells. Horizontal drilling and fracturing are used to produce shale gas. The efficiency and safety of the operation of oil and gas wells in complex mining and technical conditions depend on the quality and reliability of casing and pumping columns, which requires the modernization of machinery and technology for the installation of wells. The most technological for column fitting in the fisheries sector is threaded joints. However, breach of standard threaded connections causes 70% of all complications with pump housings and columns. This leads to significant material losses, reduced production of raw materials, contamination of the interior and the environment. Therefore, the urgent task is to improve the threaded joints by increasing their reliability and efficiency under heavy workloads.
Źródło:
Management Systems in Production Engineering; 2020, 2 (28); 97-103
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ temperatury na stan naprężenia i odkształcenia w otoczeniu komory siłowni elektrowni "Porąbka-Żar"
The relationship between temperature and stress and strain state in the vicinity of the chamber "Porąbka-Żar" power station
Autorzy:
Domańska, D.
Gruszka, R.
Powiązania:
https://bibliotekanauki.pl/articles/350000.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
wyrobisko wielkogabarytowe
temperatura
stan naprężenia
large chamber
temperature
stress state
strain state
Opis:
W artykule podjęto próbę wstępnej oceny wpływu temperatury na stan naprężenia i odkształcenia w otoczeniu wyrobiska podziemnego na podstawie analizy zjawisk zachodzących w sąsiedztwie komory siłowni elektrowni "Porąbka-Żar". Wymienione zagadnienie ma szczególne znaczenie w odniesieniu do budowli wielkogabarytowej, z jaką mamy do czynienia w rozpatrywanym przypadku, dla której nawet niewielka zmiana temperatury może powodować duże wahania parametrów ważnych z punktu widzenia jej stateczności. Podstawą przeprowadzonej analizy były wyniki pomiarów realizowanych przez OBR BG "Budkop" w wymienionym wyrobisku. Przebiegi wybranych funkcji ciśnienia panującego w górotworze i jego rozwarstwień uzyskane z badań in situ powiązano zależnościami korelacyjnymi z temperaturą panującą w komorze. Zgodnie z przewidywaniami wynikającymi z teorii termosprężystości (w pracy zostały zawarte wyniki obliczeń przybliżonych), zaobserwowano istotny wpływ oddziaływania cieplnego na charakter zmian i wartości poszczególnych parametrów mierzonych.
In the paper preliminary estimation of the stress and strain state around the underground excavation under an influence of temperature is presented. Discussing problem is very important especially for the large chamber (e.g. chamber of the "Porąbka-Żar" power station is described) for which even small fluctuation of temperature can induce big changes of stresses, significant from a static point of view. The analysis presented in the paper is based on measurements that has been executed by Budokop in the excavation. The stress and delamination functions are got from measurements and temperature is taken in the chamber, are interconnected by correlation function. In accordance with expectations coming from the thermoelasticity theory (the paper includes results of approximate calculations), existence of the significant relationship between temperature field and parameters form measurements (i.e. stress and strain in the vicinity of the chamber) is found.
Źródło:
Górnictwo i Geoinżynieria; 2005, 29, 3/1; 189-197
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 123

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