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Characteristic of technical fabric "Panama" within viscoelasticity domain
Języki publikacji
Abstrakty
Niniejszy artykuł zawiera część prac nad pełnym scharakteryzowaniem tkanin technicznych. Obiektem zainteresowania jest tkanina techniczna "Panama" firmy Sattler. Autor postawił sobie za cel zidentyfikowanie parametrów wybranych lepkosprężystych modeli konstytutywnych materiałów oraz ich weryfikację na podstawie prób jednoosiowego rozciągania ze stałą prędkością odkształcenia. Zaprezentowano dwa wybrane do identyfikacji modele lepkosprężyste, z których jeden jest reprezentowany liniowym równaniem różniczkowym, a drugi - nieliniową zależnością całkową. Dokonano zestawienia otrzymanych wyników z przeprowadzonej już części identyfikacji. Zaproponowano metodę ulepszającą proces identyfikacji parametrów modelu standardowego dla materiałów o charakterystykach nieliniowych. Przedstawiono aktualny stan prac nad identyfikacją kierunki dalszych badań.
Technical fabrics are more often used in different industry interests. Mainly in the civil engineering structures like hanging roofs or pneumatic stores, but also as the road structures reinforcement or transporting belts. The subjected textile, considered in this paper is the technical fabric "Panama", manufactured by Sattler company (Germany). It has two identical polyester thread families: warp and weft of P2/2 weaving with double side PVC coating. Despite the anisotropy of that fabric, it has been assumed that its threads were made of the isotropic material. The research presented here is concerned with the identification of the "Panama" fabric behaviour, for each thread family separately, using the constitutive relations of linear and nonlinear viscoelasticity. The research is based on the laboratory tests of uniaxial tension with the constant strain rate. Tests were conducted for five different strain rate levels from 10⁻⁵ ; till 1.67×10⁻³ ; [1/s]. For linear representation of the examined material, the three-parameter model of viscoelastic solid was applied in a form of the differential equation, and the one-integral relation of the Schapery model was assumed to describe the nonlinear viscoelasticity of examined material. Models selected for further examination were presented more precisely. The identification process based on the linear standard model was conducted using the least squares method in the Marquardt-Levenberg variant. The calculated parameters were subsequently verified and the results were compared to the experiments. As it soon turned out, some problems with parameters determination occurred, and it was necessary to modify the linear viscoelastic model, to make it able to describe the "Panama" behaviour with reference to the tension tests. The proposed modification method was presented in the paper and improved results of material's description were compared to the experiments. Some negative aspects of the identification procedure were finally pointed out, and the next steps in the research schedule were suggested, to tend towards the main aim of this investigation, that is the entire viscoelastic characterization of the "Panama" fabric.
Czasopismo
Rocznik
Tom
Strony
267--281
Opis fizyczny
Bibliogr. 16 poz., il., wykr.
Twórcy
autor
- Uniwersytet Warmińsko-Mazurski w Olsztynie, Wydział Nauk Technicznych, 10-736 Olsztyn, ul. Oczapowskiego 2
Bibliografia
- [1] A. ZAGUBIEŃ, Badania laboratoryjne i identyfikacja niesprężystych właściwości materiałowych tkaniny powlekanej "Panama", rozprawa doktorska, Politechnika Koszalińska, Koszalin, 2002.
- [2] P. KŁOSOWSKI, A. ZAGUBIEŃ, Viscoplastic Properties of Coated Textile Material "Panama" and its Usage for Hanging Roofs, Int. Symposium on Lightweight Structures, Warszawa, 2002, 627-634.
- [3] A. JAKOWLUK, Procesy pełzania i zmęczenia materiałów, WNT, Warszawa, 1993.
- [4] R. F. FUNG, J. S. HUANG, Y. C. CHEN, The transient amplitude of the viscoelastic travelling string: an integral constitutive law, J. Sound and Vibration, 201, 2, 1997, 153-167.
- [5] C. ZHANG, W. ZHANG, Elasticity recovery correspondence principles for physically nonlinear viscoelastic problems for a class of materials, Int. J. Solids Structures, 38, 2001, 8359-8373.
- [6] D. TOUATI, G. CEDERBAUM, Postbuckling of non-linear viscoelastic imperfect laminated plates. Part I: Material considerations, Compos. Struct., 42, 1998, 33-41.
- [7] G. C. PAPANICOLAOU, S. P. ZAOUTSOS, A. H. CARDON, Further development of a data reduction method for the nonlinear viscoelastic characterization of FRPs, Compos.: Part A, 30, 1999, 839-848.
- [8] G. C. PAPANICOLAOU, S. P. ZAOUTSOS, A. H. CARDON, Prediction of the non-linear viscoelastic response of unidirectional fiber composites, Compos. Sci. and Technol., 59, 1999, 1311-1319.
- [9] R. HAJ-ALI, A. MULIANA, A micromechanical constitutive framework for the nonlinear viscoelastic behavior of pultruded composite materials, Int. J. Solids Structures, 40, 2003, 1037-1057.
- [10] R. A. SCHAPERY, On the characterization of nonlinear viscoelastic materials, Polym. Eng. Sci., 9, 4, 1969, 295-310.
- [11] T. W. STRGANAC, H. J. GOLDEN, Predictions of nonlinear viscoelastic behavior using a hybrid approach, Int. J. Solids Structures, 33, 30, 1996, 4561-4570.
- [12] P. KŁOSOWSKI, W. KOMAR, Identification of the Finite Element Method Model for Technical Fabric, Modern Building Materials, Structures and Techniques, Vilnius, 2004. Publikacja w formie płyty CD.
- [13] C. BRANICKI, Niektóre problemy statyczne sieci wiszących, rozprawa doktorska, Politechnika Gdańska, Gdańsk, 1969.
- [14] CZ. BRANICKI, P. KŁOSOWSKI, Analiza statyczna wiszących przekryć tekstylnych w zakresie nieliniowym, Archiwum Inżynierii Lądowej 29, 3, 1983, 189-220.
- [15] P. KŁOSOWSKI, Numerical Problems of Calculations of Hanging Roofs, Proc. Int. Conf. On Lightweight Structures in Civil Engineering, Warszawa, 1995, 661-669.
- [16] D. W. MARQUARDT, An algorithm for least square estimation of parameters, Journal of the Society of Industrial and Applied Mathematics, 11, 1963, 431-441.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWA1-0017-0033