Process description of piercing when using degenerated model

• Autorzy: Jamroziak K.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The material piercing process is an extremely complex phenomenon for the theoretical analysis. This is connected with the fact that the materials used mainly for ballistic shields may not be treated as isotropic media. The description of piercing of ballistic shields made of light weight composite materials, on the basis of the Hooke's model and the Young's module reflects the too low result effectiveness for practical applications. The purpose of this article is the mathematical description of the impact phenomenon of a bullet of the speed ca. 400 m/s, with the use of a degenerated model. Design/methodology/approach: In the study, an attempt has been made to apply an untypical model for the piercing phenomenon analysis. Basing on the model, the theoretical analysis of the piercing phenomenon in quasistatic and dynamic load conditions, in the impact load form, has been carried out. Findings: This analysis enabled derivation of significant conclusions useful in the design process of effective ballistic shields. Research limitations/implications: In the study, the concept has been assumed that a dynamic model simple as possible, that may be analyzed not only by numerical methods but also (at least approximately) with the mathematical analysis methods, may provide significant directions concerning material piercing. Practical implications: The use of so called degenerated model allows to describe the phenomenon in more detail at various piercing speeds what extends the possibilities in the sphere of designing the optimum ballistic shields and of identification of the properties of materials applied for construction of shields. Originality/value: The proposed method of identification of material properties in the piercing process, within the relation: force – deformation, is a novel one since the essence of the identification is the standard rheological model in an adequate plastic component describing the viscous attenuation with dry friction.

Słowa kluczowe

EN

computational mechanics; impact load; impact; composites

PL

mechanika komputerowa; obciążanie udarowe; udar; kompozyty

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2008
• Tom: Vol. 26, nr 1
• Strony: 57--64
• Opis fizyczny: Bibliogr. 23 poz., tab., wykr.

Twórcy

autor

Jamroziak K.

• Combat Technology Department, The Tadeusz Kosciuszko Land Forces Military Academy, ul. Czajkowskiego 109, 51-150 Wrocław, Poland,

Bibliografia

• [1] L. J. Greaves, Failure Mechanisms in Glass Fibre-Reinforced Plastic Armour, Unpublisched UK DRA Report, 1992.
• [2] L. J. Greaves, Progress in modelling the perforation of GFRP by ballistic projectiles, Unpublisched UK DRA Report, 1994.
• [3] W. Goldsmith, J. L. Sackman, An experimental study of energy absorption in impact on sandwich plates, International Journal of Impact Engineering 12 (1992) 241-261.
• [4] K. Moriarty, W. Goldsmith, Dynamic energy absorption characteristics of sandwich shells, International Journal of Impact Engineering 13/2 (1993) 293-317.
• [5] P. Kosza, M. B. Sayir, failure patterns in the core of sandwich structures under impact loading, International Journal of Impact Engineering 15/4 (1994) 501-517.
• [6] M. L. Bernard, P. A Lagace, Impact resistance of composite sandwich panels, Journal of Reinforced Plastic Composites 8 (1989) 432-445.
• [7] J. K. Kim, T. X. Yu, Impact response and dynamic failure of composites and laminate materials, Part 2: Strain-Rate Effect, Energy Absorption and Modelling, Trans Tech Publications Ltd. Switzerland 1998.
• [8] P. D. Smith, J. G. Hetherington, Blast and Ballistic Loading of Structures, Butterworth-Heinemann, Oxford, 2003.
• [9] E. Rusiński, J. Karliński, K. Jamroziak, The chosen aspects from researech of ballistic shields, 22 nd DANUBIA-ADRIA Symposium on Experimental Methods in Solid Mechanics, DAS, Parma, Italy, 2005, 22-23.
• [10] A. Buchacz, Calculation of characterisics of torsionally vibrating mechatronic system, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 327-330.
• [11] A. Buchacz, Sensitivity of mechatronical systems represented by polar graphs and structural numbers as models of discrete systems, Journal of Materials Processing Technology 175 (2006) 55-62.
• [12] A. Buchacz, Influence of a piezolectric on characteristics of vibrating mechatronical system, Journal of Achevements in Materials and Manufacturing Engineering 17 (2006) 229-232.
• [13] A. Buchacz, The expansion of the synthesized structures of mechanical discrete systems represented by polar graphs, Journal of Materials Processing Technology 164-165 (2005) 1277-1280.
• [14] A. Buchacz, Hypergrphs and their subgraphs in modelling and investigation of robots, Journal of Materials Processing Technology 157-158 (2004) 37-44.
• [15] A. Buchacz, Modifications of cascade structures in computer aided design of mechanical continuous vibration bar systems represented by graphs and structural numbers, Journal of Materials Processing Technology 157-158 (2004) 45-54.
• [16] A. Buchacz, A. Dymarek, T. Dzitkowski, Design and examining of sensitivity of continuous and discrete-continuous mechanical systems with required frequency spectrum represented by graphs and structural numbers, Monograph No. 88. Silesian University of Technology Press, Gliwice 2005 (in Polish).
• [17] L. A. Dobrzański, R. Honysz, S. D. Fassois, On the identification of composite beam dynamics based upon experimental data, Journal of Achievements in Materials and Manufacturing Engineering 16 (2006) 114-123.
• [18] W. Derski, S. Ziemba, The analissys of rheology models, PWN, Warsaw, 1968 (in Polish).
• [19] M. Kulisiewicz, Modeling and identification of nonlinear mechanical systems under dynamic complex loads, Monograph, University of Technology, Wroclaw, 2005 (in Polish).
• [20] M. Kulisiewicz, S. Piesiak, M. Bocian, Identification of nonlinear damping using energy balance method with random pulse excitation, Journal of Vibration and Control 7 (2001) 699-710.
• [21] K. Jamroziak, M. Kulisiewicz, The calculating models used to identify light weight ballistic shields subject to impact loads, Wroclaw WSOWL Report, 2003 (in Polish).
• [22] MATLAB, The Language of Technical Computing, Using Matlab Version 5, The MATH WORKS Inc., December 1996.
• [23] K. Jamroziak, Analysis of a degenerated standard model in the piercing process, Journal of Achievements in Materials and Manufacturing Engineering 22/1 (2007) 49-52.