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首页> 外文期刊>Materials Science Research International >The Effect of Loading Direction and Stacking Sequence on the Strength in Quasi-Isotropic CFRP Laminates
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The Effect of Loading Direction and Stacking Sequence on the Strength in Quasi-Isotropic CFRP Laminates

机译：准各向同性CFRP层压板的加载方向和堆垛顺序对强度的影响

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摘要

For quasi-isotropic CFRP laminates, the elastic stress-strain behavior is expected to be the same in any loading direction and stacking sequence of laminate. But fracture and strength of them may strongly depend on the loading direction and stacking sequence of laminate. The laminate has structurally made up many interfaces and the lamina in the laminate is anisotropic due to embedded fiber. Therefore, once matrix cracking or delamination takes place in the loading laminate, the laminates change into anisotropic ones. In this paper, the tensile tests were carried out in the constant displacement velocity for the specimens, cut out in several directions from each laminate, to investigate the influence of loading direction and stacking sequence on the damage pattern and tensile strength. A FEM code was used to analyze the stresses in the specimens, and the comparison between the calculated stress-strain curves and experimental ones was attempted. In addition, using Tsai-Wu failure criterion, the strength of the laminates were predicted in the various loading directions. And the correlations between the predicted results and experimental one are discussed.
机译：对于准各向同性CFRP层压板，在层压板的任何加载方向和堆叠顺序上，其弹性应力-应变行为均应相同。但是它们的断裂和强度可能在很大程度上取决于层压板的加载方向和堆叠顺序。层压板在结构上由许多界面组成，并且层压板中的薄片由于嵌入了纤维而具有各向异性。因此，一旦在加载的层压板中发生基体破裂或分层，这些层压板就变成各向异性的层压板。在本文中，以恒定位移速度对样品进行拉伸测试，从每个层压板的多个方向切开，以研究加载方向和堆垛顺序对损伤模式和拉伸强度的影响。用有限元程序对试样中的应力进行分析，并尝试比较计算出的应力-应变曲线与实验曲线。另外，使用蔡-吴破坏准则，在各个载荷方向上预测了层压板的强度。并讨论了预测结果与实验结果之间的相关性。

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