热轧非织造材料力学性能有限元分析

Mechanics properties of thermal-bonded nonwovens by finite element analysis

利用同轴反射光显微镜拍摄热轧非织造材料的多层图像,结合多聚焦图像融合技术,得到材料的清晰图像和纤维位置信息;再通过python编程构建热轧非织造材料几何结构有限元模型,运用ABAQUS程序实现材料力学拉伸性能模拟,获得不同模型参数条件下应力—应变曲线。对比不同参数条件下有限元模型所得的应力—应变曲线发现:材料中热黏合点可以视为弹性体;在应变为0.38时纤维性能对整体材料应力的影响为30%,而热轧辊温度、生产速度和纤网面密度等因素对整体材料的应力影响为70%。

A new FE model for describing the structure of thermal-bonded nonwovens is proposed in this study .The coordinates of fibers of samples are obtained from Coaxial reflected optical microscope with multi-focus image fusion .Using python language , the new FE modal is established with the coordinates .In the finite element model , contrasting simulated stress-strain curves under different parameters of the viscoe-lastic material of bond points , the results showed that in the initial period of the mechanical tensile , plastic parameter of the thermal bonding points has 5 .4 percent effect on the mechanical properties of the whole material , the bond points can be regarded as an elastic body .In the finite element model , contrasting simulated stress-strain curves under different parameters of the viscoelastic material of fibers , the results showed that when strain is 38%, the mechanical properties of fibers have 30%effect impact on mechanical properties of the whole materials , roller temperature, production speed , fibre webs area density and other factors have 70%effect impact on mechanical properties of the whole materials .