Some fibrous composites exhibit different mechanical properties in tension as compared to those in compression. Proper material modelling is required to enable correct behavioural prediction of components made of such composites. Though the models due to Ambartsumyan, Bert and Jones are often used, there are still many unanswered questions pertaining to material modelling. In Bert's model the strain transverse to the fibres and the shear strain are discontinuous when the fibre strain is zero. In Jones' model, cross compliances in tension-compression zones are assumed to depend on the magnitudes of principal stresses.
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机译：与压缩材料相比，一些纤维复合材料在拉伸下表现出不同的机械性能。需要适当的材料建模，以便对由此类复合材料制成的部件进行正确的行为预测。尽管经常使用 Ambartsumyan、Bert 和 Jones 的模型，但仍有许多与材料建模有关的问题悬而未决。在 Bert 的模型中，当纤维应变为零时，横向到纤维的应变和剪切应变是不连续的。在 Jones 的模型中，拉压区的交叉柔度被假定为取决于主应力的大小。
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