Simulation analysis of the influence of mechanical properties of fillers on cushion comfort
Based on the background that the majority of the population spends more time in a seated position and the demand for cushion products is increasing,the selection of cushion products with a high level of comfort has become the focus of consumer attention.In this paper,for the 50th percentile male representative group in China,three kinds of materials,namely warp-knitted spacer fabrics,sponges with a medium density of 28 kg/cm3,and sponges with a high density of 50 kg/cm3 were selected as the filler of cushion products to obtain three kinds of cushion materials.We explored the mechanical characteristics of the three types of materials and the methodology and effectiveness of finite element simulation,and established relevant material microelement models to assist design prediction.The results show that the intrinsic model with the highest compression-strain fit(99.24％)among sponges with a medium density of 28 kg/cm3,sponges with a high density of 50 kg/cm3 and warp-knitted spacer fabrics is LOW DENSITY FOAM.Meanwhile,the mathematical model of the relationship among deformation of warp-knitted spacer fabrics and the amount of compression force applied,as well as the thickness of the material was obtained by using the quadratic polynomial surface fitting of MATLAB.Subsequently,the process of contact between human body and three different cushion products in sitting posture was simulated by finite element simulation in ABAQUS software to analyze the comfort of the products according to the distribution of body pressure on the cushion surface,and the validity of the simulation experiments was verified by using a body pressure tester.It is found that the peak value of the elastic cushion surface of the warp-knitted spacer fabric is larger than that of the elastic cushion surface of sponges with a medium density of 28 kg/cm3,and smaller than that of the elastic cushion surface of sponges with a high density of 50 kg/cm3,and the distribution of the overall cushion surface is more homogeneous than that of the sponge cushion;and the body pressure tester verifies that the simulation data are less than 5％of the actual test data,which proves the feasibility of the simulation experiment.Warp-knitted spacer fabrics exhibit better support and breathability than sponge materials.Combined with the results of objective data analysis,it is believed that as these materials continue to evolve,they can provide more choices for future elastic cushion products.
万方数据
维普
