Off-Axis Tensile Properties of CFRP Laminates and Non-Linear Lamination Theory Based on Micromechanics Approach.
Off-Axis Tensile Properties of CFRP Laminates and Non-Linear Lamination Theory Based on Micromechanics Approach.
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CFRP 层合板的离轴拉伸性能和基于微力学方法的非线性层合理论。
DOI：
10.1299/kikaia.67.1493
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Yuji Sugiyama
中科院分区：
文献类型：
--
作者：
K. Tohgo;Kazutomo Kawahara;Yuji Sugiyama
本文研究了CFRP正交铺设层合板在偏轴拉伸作用下的变形和损伤问题，建立了非线性层合理论。对五种不同铺层方式的CFRP正交铺层层板进行了离轴拉伸试验。在偏轴拉伸条件下，层合板的应力-应变响应表现为非线性变形，但除断裂应变较大的试件外，裂纹损伤不明显。因此，离轴拉伸下层板的非线性变形主要归因于基体树脂的非线性变形。为了描述层合板的变形，发展了一种非线性层合板理论。基于Eshelby等效夹杂法和Mori-Tanaka平均场概念，推导了弹塑性基体中含有弹性长纤维单向复合材料的增量本构关系。然后，将这种本构关系引入经典层合板理论。用本理论计算CFRP单向和正交层合板的偏轴拉伸，所得结果与实验结果吻合较好。
This paper deals with the deformation and damage of CFRP cross-ply laminates under off-axis tension and develops a non-linear lamination theory. Off-axis tensile tests were carried out on five kinds of CFRP cross-ply laminates which were different in stacking lay-up. On the laminates under off-axis tension, the stress-strain response shows the non-linear deformation, while the ply-cracking damage is not remarkable except for the specimen with large fracture strain. Therefore, It is concluded that the non-linear deformation of the laminates under off-axis tension is mainly attributed to the non-linear deformation of the matrix resin. In order to describe the deformation of the laminates, a non-linear lamination theory is developed. An incremental constitutive relation of the unidirectional composite containing elastic long fibers in the elastic-plastic matrix is derived based on Eshelby's equivalent inclusion method and Mori-Tanaka mean field concept. Then, this constitutive relation is introduced Into the classical lamination theory. Numerical results by the present theory for off-axis tension of the CFRP unidirectional and cross-ply laminates well described the experimental stress-strain relations.