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1
Content available remote Aluminum Alloy Welded Connection Tension Test and Energy Strain Investigation
Obst M., Kroczak J., Kurpisz D.
Machine Dynamics Research
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2014
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Vol. 38, No. 3
81-86
EN
Welded connections are very popular and applicable joints methods of materials. Welding technology and methods intensely developed in recent times and now its base technology is used in different industrial branches. Pressure vessels, boilers, working machines parts, plane bodies, ship hulls and other structures are made of metal, parts connected together by welding. Many welded connections work under complex stress and strain state also thermally loaded. Engineers apply typical, formulas during the design process of welded connections, some designers attempt also to use Finite Element Method in the modelling and design process of welded connections. It’s well known, welded connections zones enclose a place where materials have different properties than properties of parent materials of connected parts. In this area can cracks initiate and propagate. This paper presents tension test results of welded parts of aluminium alloy sighed as AL 5084. Authors investigated strain energy density and volume energy density dependence in the tension test process of welded specimens. Energy as an universal measure can be applied to investigate complex strength and exploitation problems. Presented results can be used as an introduction for more complicated problems of welded connections where strain energy is a base for mechanical modelling of welded connections.
2
Content available remote Analysis of the Pitch Deviation in Involute Splined Connections
Kroczak J., Dudziak M.
Machine Dynamics Research
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2013
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Vol. 37, No. 1
69-76
EN
The paper presents the measurement results of the pitch deviation for the selected involute splined connections applied in aircraft engines. The authors have stated that there is a lack of exact information on a load distribution in involute splined connections with this type of manufacturing error. Hence, the analysis of the influence of the pitch deviation in a two-dimensional model on the load distribution and stress state is presented. This model gives us an information on the load distribution coefficient in a cross-section of the involute splined connection which depends on torque, tooth pair stiffness and manufacturing accuracy of a part, ie. the pitch deviation.
3
Content available remote Displacemet determination of a thin-walled bush loaded by force and temperature
Kroczak J., Kurpisz J., Obst M.
Journal of Mechanical and Transport Engineering
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2013
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Vol. 65, No. 4
29--37
EN
Pin joints are very popular couplings in applied mechanical engineering. A lot of constructions and mechanisms are equipped with such type of kinematic pair. Pin joints are often applied as hinge connections in many responsible assemblies such as engine parts, bridges set systems, cranes etc. These connections work in different operating conditions which play a fundamental role during the design process. The paper presents the analysis of thermo-mechanically loaded thin-walled pin joint and the analytical solution of displacement equation for a bush. The obtained solution was verified by the finite element method. The presented results and proposed solutions can be applied for more complex problems where nonlinearity of strains, heat transfer, contact dependencies and grease coating influence are considered.
PL
W artykule przedstawiono analizę cienkościennego połączenia sworzniowego obciążonego termomechanicznie oraz analityczne rozwiązanie równania przemieszczenia ścian tulei. Otrzymane rozwiązanie zweryfikowano za pomocą metody elementów skończonych. Przedstawione wyniki stanowią podstawę do analiz bardziej złożonych zagadnień, w których można uwzględnić nieliniowość odkształceń, przepływ ciepła, warunki kontaktu pomiędzy współpracującymi powierzchniami oraz wpływ smarowania na zachowanie tulei.
4
Content available remote Analysis of the Pitch Circle Runout in Involute Splined Connections
Kroczak J., Dudziak M., Podolski T.
Machine Dynamics Research
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2011
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Vol. 35, No. 2
13-19
EN
The paper presents measuring methods of the pitch circle runout of involute splines and determination of the roundness deviation of the pitch circle from its runout results. The analysis of the influence of the runout on the tooth thickness, pitch and profile deviations is also shown. It was pointed out that the most characteristic roundness deviation is a pitch circle ovality of internal involute spline. This type of deviation often occurs for the parts with high hardness of material. The ovality is the reason for unequal contact depth of teeth and irregularity of interference or backlash.
5
Content available remote Analysis of Geometrical Structure of the Selected Connections in Mechanical Engineering
Podolski T., Dudziak M., Kroczak J.
Machine Dynamics Research
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2011
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Vol. 35, No. 2
62-71
EN
The quality of connection has an essential influence on the quality of the whole machine. The authors conducted an estimation of the influence of geometrical profile (in tolerance area) on the quality of shaft and hub connection. Values of displacements of construction elements, reduced and contact stresses were accepted as quality criterion.
6
Aspekty projektowania pasowań w połączeniach osiowosymetrycznych
Podolski T., Kroczak J., Dudziak M.
Modelowanie Inżynierskie
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2010
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T. 8, nr 39
171-176
PL
Projektowanie połączeń jest istotną częścią projektowania nowych maszyn. Zadaniem konstruktora jest dobór parametrów geometrycznych, które zapewnią właściwą współpracę, wśród nich właściwe pasowanie. Dla pełniejszej identyfikacji połączeń z tymi samymi typami pasowań zbudowano po dwa modele obliczeniowe dla wybranych pasowań: jeden dla górnej odchyłki otworu i dla dolnej odchyłki wałka i drugi dla dolnej odchyłki otworu i dla górnej odchyłki wałka, uzyskując kilka zestawów wyników.
EN
During design of new machine element there must be described the function, which must be satisfied. Depending on designed function and loads designer selects geometrical parameters, which has to provide a proper cooperation, and especially fits. Constructor during design of new connection does not have knowledge about the influence of value of fit on stresses of elements of connection. For full identification of connections with the same types of fits there were created two calculation models for selected fits: first one for upper deviation of hole and lower deviation of shaft, and second one for lower deviation of hole and upper deviation of shaft. From the simulations and calculations there were obtained a few sets of results. Designer is interested in getting reduced stresses according to Huber-Misses hypothesis, displacements and distribution of contact stresses on mating surfaces.
7
Content available remote Problem of Friction in the Selected Machine Connections
Kołodziej A., Kroczak J., Podolski T.
Machine Dynamics Problems
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2008
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Vol. 32, No. 2
16-23
EN
Manufacturing errors of shape connection elements and also assembly errors (random assembly) cause that the state of connection is different from made constructional assumptions. Superposition of errors manifests in reduction of connection functionality, and in consequence loss of technological-operating capability. Hence results the necessity of change of approach to shape connections design. One of essential operation tendencies is objectivization of contact surface of mating elements. In order to conduct it there must be connected the achievements of modern measuring and computing technique, which will allow to fits modelling so as to develop the decision about the selection of idea of design solution.
8
Content available remote The Development of Axial Symmetrical Splined Connections Design
Dudziak M., Kołodziej A., Kroczak J., Podolski T.
Machine Dynamics Problems
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2006
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Vol. 30, No. 3
79-87
EN
In this article there are presented problems connected to shape and positioning deviations of involute splined connections. Basing on carried out researchers of roundness and cylindricity deviations of spline shafts there were made some simulations of different combinations of shape deviations. For a connection of ideal internal spline with external spline having simulated particular shape deviation there was carried out design analysis of the splined connections which pointed out the influence of shape deviations on the feature of that connection.
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