This paper deals with the theoretical prediction of global buckling loads for carbon fiber composite pyramidal truss core sandwich columns. Different from thin plate structures, transverse shear effect can not be negl...This paper deals with the theoretical prediction of global buckling loads for carbon fiber composite pyramidal truss core sandwich columns. Different from thin plate structures, transverse shear effect can not be neglected for sandwich structures. In addition, the attributes of the laminated face sheets are considered in the present paper. A zig-zag displacement approximation is made. Based on the principle of minimum potential en- ergy, equilibrium equations and boundary conditions are derived via the variational method. The critical buck- ling loads under various boundary conditions are presented. In order to validate the reasonableness of the equiv- alent-core method, the strain energies stored in the actual discrete truss members and the equivalent continuous homogenous core layer are calculated respectively and compared, and a good agreement is obtained. The pro- posed analytical method is verified by comparing with the published theoretical predictions and experimental re- suhs.展开更多
基金Sponsored by the National Science Foundation of China(Grant No. 11202059,11222216,11172080)the Major State Basic Research Development Program of China(Grant No. 2011CB610303)+1 种基金the Key Laboratory Opening Funding of Advanced Composites in Special Environment(2011)the Fun-damental Research Funds for the Central Universities(Grant No. HIT. NSRIF. 2010069)
文摘This paper deals with the theoretical prediction of global buckling loads for carbon fiber composite pyramidal truss core sandwich columns. Different from thin plate structures, transverse shear effect can not be neglected for sandwich structures. In addition, the attributes of the laminated face sheets are considered in the present paper. A zig-zag displacement approximation is made. Based on the principle of minimum potential en- ergy, equilibrium equations and boundary conditions are derived via the variational method. The critical buck- ling loads under various boundary conditions are presented. In order to validate the reasonableness of the equiv- alent-core method, the strain energies stored in the actual discrete truss members and the equivalent continuous homogenous core layer are calculated respectively and compared, and a good agreement is obtained. The pro- posed analytical method is verified by comparing with the published theoretical predictions and experimental re- suhs.
