用于加筋结构的半连续有限元模型

针对飞机损伤结构安全性评定的要求,为减小加筋壁板有限元分析的计算规模,本文提出了一种二维有限元筋条模型———半连续模型。该模型可用来分析三维的飞机加筋壁板结构,分析精度及可信度显著地优于二维平条模型,与三维及准三维模型相当,而分析工作量及复杂性小于后两种模型。半连续模型还可推广用于其他薄壁结构,只要构成结构的各板元之间是正交连接而非斜交连接的。

Semicontinuous Model Used in Finite Element Analysis of Stiffened Structures

According to requirement of the security access to damaged structures of airplanes and in order to reduce calculation amount in analysing 3-D stiffened panels of airplanes with finite element method, the paper puts forward a 2-D finite element model, semicontinuous model, which can be used in analysis of 3-D stiffened structures of airplanes. As the model is used, the analytical accuracy and confidence is notably superior to the flat-plate model, a 2-D model, and is almost equal to the 3-D or quasi 3-D model, and the amount and complex of work is less than the latter two model. The semicontinuous model can be used in other thin wall structures, provided component panels of the structure are jointed perpendicularly ,not obliquely.