非织造布力学各向异性与顶破强力的模拟计算

本文研讨非织造布力学性质估算方法。取对称于两垂直轴的各向异性平面体,各方向的应力与应变保持线性,应用平面体任意方向的拉伸模量与主模量间的关系式,推导得出上述平面体的顶破强力计算公式。顶破强力计算式中包括舍弹性常数(材料拉伸应力方向与主模量方向间夹角的函数)、材料最小断裂伸长率和试样尺寸等参数。设令非织造布符合上述平面体模型,采用非织造布力学性质实测资料验证其适应程度。文中给出两种涤纶热轧非织造布的试验结果与理论计算值随参数值变化的规律基本一致,丙纶溶喷非织造布的顶裂强力实测值与理论计算值的差异随参数值不同而变化。

THE RELATION BETWEEN THE MECHANICAL ANISOTROPY AND THE BURSTING STRENGTH FOR NONWOVEN FABRICS

This paper deals with the evaluation of the method for calculating bursting strength of nonwoven fabrics. A methematical expression which describes the relation between the mechanical anisotropy and the bursting strength of nonwoven fabric was derived according to the assumption of stress and strain keeping linear relation in all different directions of nonwven fabric and using the equation between moduli of major direction and any direction for anisotropy planar body. Some parameters, such as the elastic constants of different nonwoven directions, the minimum breaking elongation of nonwoven and size of specimen etc., are all included in this eapression. The methematical expression was also proved using the experimental data of the three types of nonwoven fabrics and discussed respectively. The regularity of the experimental value and theoritical prediction is nearly consistant.