基于细观模型的复合材料力学性能预测方法

Prediction method for mechanical properties of composites materialsbased on mesoscopic model

文章基于细观力学方法,建立了细观代表性体积单元RVE模型,通过设计RVE模型的单胞尺寸和排布方式,施加周期性条件,研究了基于细观模型的复合材料力学性能的预测方法。首先,针对玻璃纤维/环氧树脂单向复合材料,预测了横向、纵向弹性模量和泊松比,研究了均匀纤维排布对纤维树脂基复合材料力学性能的影响规律,通过与参考文献的试验值对比,验证了文章预测方法的精准性。然后,面向碳纤维/环氧树脂单向复合材料,通过改变纤维的有效直径,进而观察在不同纤维体积含量的影响下,四边形RVE模型和六边形RVE模型在预测复合材料力学性能的差异性。研究结果表明,四边形细观RVE模型在基于横向拉伸载荷作用下的有效模量的预测结果更为精确,为此种模型的预测及应用提供了一个新思路。

Based on the mesomechanics properties,in this paper,the mecroscopic Representative volume element(RVE)model has been established and studied.By designing the single cell size and arrangement of the RVE model,and applying periodic conditions,and a prediction method of mechanical properties of composites has been presented based on the micro-model.Firstly,for the glass fiber/epoxy resin unidirectional composites,the transverse and longitudinal elasticity modulus and Poisson's ratio has been predicted,and the influence of uniform fiber arrangement on the mechanical properties of fiber resin matrix composites was investigated.And the accuracy of prediction method has been verified by the prediction results of this paper are compared with the experimental values in the literature.Then,for the carbon fiber/epoxy resin unidirectional composites,by changing the effective diameter of the fiber,and then predicting the difference in mechanical properties of composites of the quadrilateral RVE model and the hexagon RVE model under the influence of different fiber volume contents has been observed.The results show the more accurate prediction result of the effective modulus of the quadrilateral RVE model under the effect of lateral stretching loads,and presenting a new thought for the prediction and application of this model.The results show the more accurate prediction result of the effective modulus of the quadrilateral RVE model under the effect of lateral stretching loads,and presenting a new thought for the prediction and application of this model.