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Abstract
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Mechanical behavior of woven fabrics under deformation is difficult to predict due to their complex geometric structure. This study is undertaken to simulate mechanical behavior of two-layer woven fabrics by the finite element method starting with accurate geometric modeling. This research introduces a general fabric modeling method which provides a convenient way for complicated fabric structures such as multi-layer woven, braided and knitted structures to be analyzed. After establishing a geometric model for the unit cell of a complex structure, a mechanical model which includes material properties, contact specification and periodic boundary conditions is built using Static Structure module of Ansys Workbench software. To validate the model, five different two-layer woven fabrics are used as samples in the experiments. Geometric parameters of each sample are measured using microscope for accurate modeling. The modulus and Poisson’s ratio of each yarn, which are the input data for the mechanical model, are determined through tensile tests according to the ASTM D3822-07. Tensile properties of each sample, were also obtained according to the ASTM D5035-11 and compared with simulation results for the validation of the model. Simulation results agree well with the experimental data. Detailed stress-strain field throughout the entire representative volume is exhibited.
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