The general Tadeusz Kosciuszko Military Academy of Land Forces

Wrocław, Poland

The general Tadeusz Kosciuszko Military Academy of Land Forces

Wrocław, Poland
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Roskowicz M.,Military University of Technology | Smal T.,The General Tadeusz Kosciuszko Military Academy of Land Forces
Engineering Transactions | Year: 2013

The paper presents research on the durability of adhesive composites, which may be used for the repair of technical objects. Durability of adhesive composites is understood in this paper as a material ability to transfer long lasting loads. Since that kind of information is not provided by manufacturers, the long-term strength and fatigue-life of selected adhesive composites are determined; especially with regard to their use in expedient (temporary) repairs of weapon systems. The results obtained show that safe values of the maximum long-term and fatigue loads of the adhesive composites investigated should be a half of the short-term strength obtained in a static tests.


Roskowicz M.,Military University of Technology | Smal T.,The general Tadeusz Kosciuszko Military Academy of Land Forces
Eksploatacja i Niezawodnosc | Year: 2013

The paper presents methodology and results of research on durability of composite materials, which were applied to expedient repair of damaged aircraft components. Numerical calculation and experimental tests were conducted during research. The obtained results proved that failure of aircraft components is connected with local loss of stability in case of aircraft's skin and stiffness in case of girders and beams. The damaged components were repaired with the use of a metal insert and a composite patch. The use of a metal insert, which had the same stiffness as repaired elements, was a solution which allowed to restore local stiffness of repaired components. Composite patches which were formed with glass, carbon or aramid fabrics impregnated with epoxy resins, also created an adhesive bonds and joined all elements of repaired zone. The experimental tests proved that the executed repairs whose time was limited to 120 minutes improved stability, stiffness and fatigue life of the repaired components.


Duchaczek A.,The General Tadeusz Kosciuszko Military Academy of Land Forces | Manko Z.,Wrocław University
KSCE Journal of Civil Engineering | Year: 2016

This paper presents a concept of span structure of a military bridge in which screws were used in assembly of sway braces. This type of sway braces assembly requires holes in main girders that weaken their structure. Especially holes located in the stretch zone of these girders can become a place of stress concentration, and very soon can become a place of fatigue crack initiation. The paper presents also an optimization of the location and size of the mounting holes in the steel girders of non-standard fixed bridges due to their impact on the final durability and stability of structures. To numerical analysis, there was normal IPN 400 steel I-beam adopted with a total length equal to 5.60 m. The analysed issue was related to the optimization of the structures, namely the location of the mounting holes–specifically to their endurance. The analysis showed that the location of the holes according to the proposed in this article scheme it seems to be also the optimal solution. The obtained conclusions apply to both steel I-beams and C-sections with heights ranging from 300 to 500 mm, as the most commonly used for the construction of non-standard fixed bridges. © 2016 Korean Society of Civil Engineers and Springer-Verlag Berlin Heidelberg


Duchaczek A.,The General Tadeusz Kosciuszko Military Academy of Land Forces | Manko Z.,Wrocław University
KSCE Journal of Civil Engineering | Year: 2016

The analysis of the development of fatigue cracks conducted using a computer program requires a simple 2D surface model to be applied. The paper presents an example of creating four calculation models of a steel girder, two of which have been implemented in FRANC2D software. A 400 mm-high and 5.60 m-long steel I-beam was studied. Analysis of the development of fatigue cracks around the I-beam fastener holes was conducted for two selected computation models. What has been obtained as the result of the analysis was an answer to the question about the influence of the location of fastener holes on the propagation rate of hypothetical fatigue cracks. This answer was obtained indirectly, i.e. through the analysis of the value of stress intensity factor K. © 2016 Korean Society of Civil Engineers and Springer-Verlag Berlin Heidelberg


Bocian M.,Wroclaw University of Technology | Jamroziak K.,The General Tadeusz Kosciuszko Military Academy of Land Forces | Kosobudzki M.,The General Tadeusz Kosciuszko Military Academy of Land Forces
Solid State Phenomena | Year: 2015

Materials used for the construction of ballistic shields are characterized by a variety of behaviours under the influence of external loads. Ballistic impact (by a bullet) in armour (ballistic shield) is an example of the phenomena that could be considered in the category of a dynamic load caused by the strike of the mass. Computer simulations are commonly used in such situations. It is especially important to adopt a proper model of the behaviour of the material. This paper presents the results obtained by simulating free 3D points and using the application developed by the authors for the purpose of this research. The made calculations include the translational motion and rotary motion of the projectile as well as the stiffness of the material, the damping of the material, friction at the points of contacting surfaces, viscous friction and plastic deformation (the material beyond the plastic yield point is perfectly plastic). The results of simulations were validated with experimental research. © (2015) Trans Tech Publications, Switzerland.


Kosobudzki M.,The General Tadeusz Kosciuszko Military Academy of Land Forces | Smolnicki T.,Wroclaw University of Technology | Stanco M.,Wroclaw University of Technology
Solid State Phenomena | Year: 2015

In the paper, the model of estimating the loss of maintenance potential of high mobility wheeled vehicles within proving ground tests is presented. This problem is up-to-date, especially important for military vehicles. The authors have analysed the selected requirements directed to this class of vehicles. In the main body of the paper, some model that could be applied in on-line system of prognostic Health and Usage Monitoring System (pHUMS) was presented. This model can be used to analyse information about the maintenance process of vehicle before some maintenance decision would be made. © (2015) Trans Tech Publications, Switzerland.


Kosobudzki M.,The General Tadeusz Kosciuszko Military Academy of Land Forces | Jamroziak K.,The General Tadeusz Kosciuszko Military Academy of Land Forces
Solid State Phenomena | Year: 2015

The chosen problems of selection the basic chassis for special purpose body are presented in the paper. The technical data of chassis have to go through various tests, most often within the proving ground tests. The paper contains the analysis of chosen tests and their usefulness in the design process of special purpose vehicle. © (2015) Trans Tech Publications, Switzerland.


Jamroziak K.,The General Tadeusz Kosciuszko Military Academy of Land Forces
Solid State Phenomena | Year: 2015

The article discusses the issues regarding the identification process of the ballistic impact on a shield of composite construction. Using a mathematical model of the phenomenon of piercing the material with a bullet fired from a firearm, it has been assumed that the resisting force F of the material is described by a non-linear function consisting of the elastic element and the dissipative element. Identification equations have been derived for specific structures of the model. The studies related to the response of the model to pulse load have been conducted by numerical simulations the results of which have been verified by the tests conducted in a shooting range. © (2015) Trans Tech Publications, Switzerland.

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