In technical textile engineering, macro-level phenomenological modelling effectively describes the material’s highly nonlinear behaviour. However, existing material laws concentrate on the normal stiffness in the orthotropic yarns and simplify the shear effect because of the two orders of magnitude difference between shear and normal stiffness. This article introduces an improved phenomenological model that includes nonlinear shear behaviour, and it determines the material parameters with a previously applied data fitting method for exponential functions. The nonlinear shear behaviour is valid for the elastic state, that is, at the service level of the loads. Time-dependent, cyclic loading or plastic behaviour is not considered.

在技​​术纺织工程中，宏观现象学建模有效地描述了材料的高度非线性行为。然而，由于剪切刚度和法向刚度之间存在两个数量级的差异，因此现有的材料定律集中于正交各向异性纱线的法向刚度并简化了剪切效果。本文介绍了一种改进的现象学模型，该模型包括非线性剪切行为，并使用先前应用的指数函数数据拟合方法确定了材料参数。非线性剪切行为对于弹性状态（即，在载荷的使用级别）有效。不考虑与时间有关的周期性载荷或塑性行为。