| With the wide application of membrane structure, people paid more and more attention to the mechanical property of woven architectural membrane material. It is different from these general building materials. It is a flexible composite material made of the coated fabric, and it has to rely on its tensioned shape to bear the load. Its knowledge of the tensile property in various kinds of tensile loads is helpful for the human beings to design and build the membrane structure. Therefore, the purpose of this study is to simulate and analyze its mechanical properties by the application of ABAQUS finite element software.Through the simulation in tension test specimen by ABAQUS, woven fabric tension test and the woven architectural membrane material tension test, these goal were:(1) Selected a suitable specimen by comparing the stress distribution quickly under the conditions of different shape and size;(2) Developed a woven fabric model and then analyzed the impact of the interaction between yarns for the tensile properties.(3) Built a woven architectural membrane material model and simulated the uni-axial and bi-axial tension tests to obtain a reliable tension elastic modulus.The effect of specimen’s shape and size were discussed in the simulation of uni-axial and bi-axial tension test of the woven architectural membrane material. It showed that it was possible to make the stress distribution appropriate and reduce the opportunity of breaking around the collet by choosing the right ratio of the specimen’s width and length and suitable chamfer radius. The bi-axial tension test specimen is best when its size is180mm×180mm, and its chamfer radius is5mm, width is60mm, crack length is approximately equal to the length of the tension test axis and the number of fractures is5.The woven architectural membrane material is composed of fabric substrate and coated matrix. It is necessary to simulate the woven fabric’s tension test firstly. The woven fabric model was established. It was simulated with the dynamic-explicit. The "Step" value and penalty factor of interaction between warp and weft were considered. The effect of yarn performance parameters on the results was analyzed. It showed that the "Step" value affected the simulation results and time-consuming of the dynamic explicit calculation significantly, but it was not obvious on the effect of interactions between the warp and weft yarns. In addition, the performance parameters of yarns directly affect the simulation results.Uni-axial and bi-axial tension tests of the woven architectural membrane material were simulated. The influence of the type of interaction between warp yarn and weft yarn, the yarn cross-sectional shape, material properties and so on for the tension test simulation result were discussed. Then, the appropriate interaction and cross-sectional shape were defined, and the final simulation was done. The effect of simulation results caused by the changing of yarns and matrix performance parameters was studied. It was found that its property changed about10%as the yarn properties change10%, while its property just changed about5%as the matrix change50%. It is obvious that bi-axial tension test simulation result was not good. The reason was that the finite element analysis software could not simulate the special interwoven construction of fabric. It was proposed that yarn’s property is not immediately fully exhibited when it was tensioned at the initial stage, but slowly increased to a certain percentage, and fully released its performance when the strain arrived at a certain point. As a result the uni-axial tension test simulation result was much more satisfied with this method, and bi-axial tension test simulation results could also reduce the error significantly. |
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