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Viscoelastic modelling of regular cross-ply polymer-matrix laminates

机译：常规交叉层聚合物 - 基质层压板的粘弹性建模

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Recent rheological experiments performed on cross-ply laminates have pointed out that polymer-matrix laminates may exhibit valuable creep shear strains. So far, a problem of viscoelastic modelling has been developed only for UD xFRP composites, i.e. thermosets reinforced with long fibres aligned unidirectionally. In the modelling, the most advanced rheological model of thermosets, denoted with the symbol HWKK/H, has been employed. This model is capable of modelling short-, moderate- and long-term rheological processes. In this study, the analytical approach developed for UD xFRP composites has been extended on a regular cross-ply polymer-matrix laminate, denoted with the symbol CP xFRP, of the [0/90]_(ns), n ≥ 4 plies' configuration. The plies, made of a specified woven fabric, are repeatable with respect to their thickness and microstructure. On the micromechanics level, each ply is modelled as a linearly viscoelastic monotropic continuum with the monotropy axis coinciding the direction of fibres' alignment. A regular CP xFRP laminate is modelled as a homogeneous orthotropic continuum. Standard and inverse viscoelasticity equations of an orthotropic solid body modelling a homogenized CP xFRP laminate are formulated and analytic algorithms for determination of elasticity and viscoelasticity constants are developed. The calculation algorithms have been computerized and used to calculate the viscoelasticity coefficients of the specified CP CFRP laminate.
机译：在十字形层压板上进行的最近进行的流变实验指出，聚合物 - 基质层压材料可以表现出有价值的蠕变剪切菌株。到目前为止，已经仅针对UD XFRP复合材料开发了粘弹性建模的问题，即使用长纤维增强的热固性件，单向对齐。在建模中，已经采用了与符号HWKK / H表示的热固性质的最先进的流变模型。该模型能够建模短，中等和长期的流变过程。在该研究中，为UD XFRP复合材料开发的分析方法已经在常规的横向聚合物 - 基质层压体上延伸，与符号CP XFRP表示的常规交叉帘布层，其中[0/90] _（ns），n≥4层'配置。由指定的织物制成的帘布层相对于它们的厚度和微观结构是可重复的。在微机械水平上，每个层被建模为线性粘弹性单调连续体，单层轴与纤维对准的方向相结合。常规CP XFRP层压材料被建模为均匀的正向性连续体。标准和逆粘弹性等式的正极性固体模拟均质化CP XFRP层压材料，并开发了用于测定弹性和粘弹性常数的分析算法。计算算法已经计算机化并用于计算指定CP CFRP层压板的粘弹性系数。

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