Strength property of composite elevator landing doors
                                                          CHEN Dongdong1, MAO Hangyu2, YANG Kaijie1
(1.National Elevator Product Quality Supervision and Inspection Center, Zhejiang Provincial Special Equipment Inspection and Research Institute, Hangzhou 310000, China; 2.Elevator Inspection Office,Hangzhou Special Equipment Inspection and Research Institute，Hangzhou 310003, China)

Abstract: Aiming at the problems of the elevator landing doors strength properties of composite material application, door panels and ribs were designed by antisymmetric orthogonal layer. Their strength properties were studied through the composite material finite element method (FEM) and the TsaiWu strength criterion. Under the landing doors finite element model effective verified by the type tests, uniaxial epoxyglass fiber (E-G) and epoxycarbon fiber (E-C) were used to compare the strength property influence of different landing doors panel thickness and number of ribs in details. The results indicate that the E-G and E-C composite landing doors with antisymmetric orthogonal layering design can meet the requirements. The transverse compression strength of composite E-G and E-C is several times higher than the transverse tensile strength. The inner surface of the landing door panel is subjected to the maximum tensile stress, while the outer region is subjected to the maximum compressive stress. The lateral stress distribution dominates the landing doors strength failure. The strength index value near the inner region panel is the largest. Improvement of material properties, panel thickness and the number of ribs can effectively improve the door strength.

Key words: composite material; elevator landing door; finite element method; TsaiWu strength criterion; antisymmetric orthogonal layering