In today's office environment, the demand over a feeling of sitting is increasing by the spread of IT equipment. Because evaluation of human's feeling of sitting is difficult, this study proposes numerical analysis as the evaluation technique. In case that product (chair) is evaluated by numerical analysis, expression of the material by numerical model is important. This study pays attention to
... [Show full abstract] the textiles set on the seat surface of chair product. Textiles are constituted by combination of many yarns. As the structure is geometrically complicated, the deformation behavior of textiles shows anisotropy and strong non-linearity. The textile on seat surface is put under the multi-axial loading. Therefore, the numerical model of textiles needs to correspond to such deformation behavior. This study constructed the numerical model of the textiles in which introduced mechanical properties of yarn and weave structure. The mechanical properties of yarn were adapted in the axial extension property and the compression property of a cross-section. In numerical analysis the weave structures were constructed by numerically modeled yarn. The weave structure was expressed by combining the numerical model of yarn like actual textiles in numerical analysis. At this time, the weave structure of the numerical model was expressed paying attention to the weave density, and warp/weft. So, the numerical model was able to express the anisotropy of textiles on numerical analysis. This paper proposed the numerical model and its construction technique of the textiles which can express the deformation behavior under the multi-axial loading of textiles on numerical analysis.