Study on thermal buckling temperature of a lattice sandwich panel（1st Report, Existence and evaluation of two types of buckling modes）

Abstract

In this study, the critical buckling temperature of a lattice sandwich panel was investigated by using FEM. In particular, the effects of geometric properties, for example a core height h, a core length L, and the number of cells Nc on the buckling temperature, were discussed. It is confirmed that the lattice sandwich panel also has the global and local buckling modes that are common in a latticed members, and a correction factor which includes the effect of the number of cells Nc is presented for estimating the global buckling temperature of the panel. Multiplying the analytical equation of the buckling temperature which was derived from the conventional homogenization method by the correction factor, the buckling temperature can be estimated with a good accuracy. On the other hand, the local buckling temperature can be estimated by considering the buckling behaviour of a small plate surrounded by the cells and supported by four corners.

Keywords

• lattice
• sandwich panels
• thermal buckling
• critical buckling temperature
• global and local buckling
• fem