摘要
研究任意多向铺层层压复合材料层间应力的有限元分析方法。分别考虑两种建模方法,一种是采用8结点等参实体单元逐层进行离散化,每个子层都视为正交异性材料;另一种方法是在子层面内采用4结点板元进行离散化,而在层间采用刚性元和弹簧元进行离散化,称为准三维模型。计算实例为两种不同铺层的T300QY8911碳纤维双马树脂层压板条,其中一个板条连续,另一个含圆孔,均受到面内拉伸载荷作用。采用的计算软件为MSC.Nastran。计算结果表明,在受拉板条的自由边和孔口附近存在不能忽视的层间应力。两种建模方法有各自的特点,计算结果可以互相印证,而后一种方法更加灵活和有更广泛的适应性。
The finite element modeling techniques have been evaluated for the interlaminar stress analysis of multidirectional composite laminates. In one of the techniques, each ply of a laminate is orthotropic in property and modeled by the 8-node 3D solid elements, with one element across its thickness. Another technique suggests that the laminate be modeled by a combination of 2D plate elements, MPC （rigid） elements and 1D spring elements, named mixed 1D/2D/MPC model. The interlaminar stresses can be figured out through the spring forces. MSC. Nastran software were used for the calculation. As the examples, two rectangular straps of T300/QY8911 laminates subjected to in-plane tension were calculated especially for interlaminar stresses. Both straps have different stacking sequences and one of which contains a central open hole. Results are plotted for the ply interfaces presenting considerable interlaminar stresses near free edges and the hole edge and thereby are likely to delaminate. Both modeling techniques are effective in evaluating interlaminar stresses and the mixed 1D/2D/MPC model is more suitable for the simulation of interlaminar damages.
出处
《机械强度》
EI
CAS
CSCD
北大核心
2006年第2期224-228,共5页
Journal of Mechanical Strength
关键词
复合材料层压板
层间应力
有限元分析
建模方法
Composite laminate
Interlaminar stresses
Finite dement analysis
Modeling
