| Seamless knitting technology are widely used in the production of tight compression sports garment,however,the design process mainly depends on an engineer's experience.Fabrics with specified tensile property and tight compression need to be knitted repeatedly with its knitting parameters adjusted for the desired effect,which lacks of efficiency,and will cause wasting of resources with manufacturing cost promoted.And for tight compression garment,pressure is an important indicator to evaluate clothing comfort and functionality.Thus,in order to enhance the product development efficiency and improve functional creativity,there is need to study the knitting parameters of seamless fabric and tight clothing pressure.Firstly,three knitting parameters,including linear density of bare elastic yarn,yarn feed tension and structure of fabric,were regarded as impact factors,and by using Box-Behnken response surface methodology,the experimental scheme of fabric samples was designed.The correlation between elasticity modulus and all the impact factors was tested and analyzed,and a response surface model for elasticity modulus prediction was built.Secondly,human thigh was taken as the experimental subject.By using Three-dimensional body scanner,point cloud data of human thigh was collected.And the human thigh was reconstructed in two reverse engineering softwares – Imageware and Solidworks.Then it would be import to ANSYS workbench 19.0 for finite element simulation.When the computer finished calculation,the pressure distribution of thigh entity would be simulated,and the result was presented in both three – dimensional animation and numerical form.Finally,a validation experiment was designed to verify the result of numerical modeling to ensure its accuracy and validity.It was found that the effect of yarn feed tension on elasticity modulus was least significant,while linear density and structure maintained great influence.In order to highest fabrics' elastic modulus,it went: 1×1 mockrib > cross float > plain stitch.For cross float and plain stitch,horizontal elastic modulus was higher than vertical,whereas elastic modulus of 1×1 mockrib performed equally.By analysis of knitting parameters,a quadratic response surface regression model of elasticity modulus was raised,which could calculated a bare elastic yarn knitting fabric by using its parameters,then predicted its tensile property and provided basis for product development.It was proved that the finite element model was able to predict pressure accurately.Through pressure numerical simulation of three fabric samples with different tensile modulus(0.111 Mpa,0.253 Mpa and 0.523Mpa),it indicated that pressure change via elongation varied.For fabric with low tensile modulus,its tight compression merely changed as elongation raised.But for fabric with high tensile modulus,tight compression promoted as elongation increased.Via tensile modulus numerical model and pressure finite element simulation method,A fabric's tensile property could be predicted,according to its knitting parameters,and tight compression upon thigh could be simulated as well.The study was contributed to the understanding of tight compression mechanism,and also provided basis for development of tight compression clothing. |
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