[11] [11] Deng Zongbai，Zhao Jinsen，Jiang Lan.Research on the equivalent me-chanical parameters for the honeycomb core based on the Y element[J].Advanced Materials Research，2012，594-597:672—676.

[13] [13] Xue M D，Lu Q H，Zhuang R Q，et al.Stress and strength analysis by FEM of fibre reinforced plastic pipe tees subjected to internal pressure[J].International Journal of Pressure Vessels and Piping，1996，67(1):11—15.

[14] [14] Soden P D，Kaddour A S，Hinton M J.Recommendations for designers and researchers resulting from the world-wide failureexercise[M].Elsevier Ltd，2004.

[16] [16] Kwang B S，et al.An experimental study of low-velocity impact responses of sandwich panels for Korean low floor bus[J].Compos Struct，2008，84(3):228.