In this work a geometrically nonlinear finite shell element is presented, incorporating
piezoelectric layers. The finite element is implemented in a total Lagrangian approach,
which requires special attention to be given to the proper definition of the mechanical and
electrical quantities. The strain–displacement relations are based on the assumption of
small strains and moderate rotations. The transverse displacement field and the transverse
electric potential are assumed to vary linearly through the thickness. With the presented
finite element, static as well as dynamic examples are calculated. The differences
between the results obtained with linear and nonlinear theory are emphasized.
The paper presents the results of experiments on the technical fabric ''Panama'' carried out with the purpose of identification of inelastic properties of the warp and weft as well as the identification techniques based on the least-squares method. The material parameters are calculated on the basis of the uniaxial tension test in the warp and weft directions. The dense net type of a finite element is proposed to express the behaviour of the technical fabric in the FEM analysis. The Bodner-Partom and Chaboche viscoplastic models are applied to the description of the warp and weft properties. The results are verified by numerical simulation of the laboratory tests.
The aim of the present paper is to propose a method of laboratory tests necessary for the identification of mechanical properties of the coated fabric. The material parameters of the coated fabric AF 9032 are specified on the basis of the uniaxial and biaxial tensile tests. For the identification process, the techniques based on the least squares methods are used. Additionally, the uniaxial and biaxial cyclic tests are performed in order to observe a change of immediate mechanical properties under cyclic load.
This article presents a review of technical fabrics testing methods used by the authors on the basis of their experience with research on properties of polytetrefluoroethylene-coated fabrics used for Forest Opera in Sopot (Poland). First, the different types of testing methods used for description of mechanical properties (uniaxial tensile tests, biaxial tensile tests and shear tests) of technical woven fabrics are described. The authors present the collection of test methods and discuss the results of these tests for different fabrics. Finally, the effects of temperature on mechanical properties are studied.
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