NUMERICAL SIMULATION OF LARGE DEFORMATION OF FLAT-TOPPED CONICAL SHELLS MADE OF TEXTILE

Abstract

THIS PAPER NUMERICALLY ANALYZES THE LARGE DEFORMATION BEHAVIOUR OF A GRID-DOMED TEXTILE COMPOSITE CONSISTING OF °AT-TOPPED CONICAL CELLS UNDER QUASI-STATIC AXIAL COMPRESSION. BASED ON EXPERIMENTAL OBSERVATIONS AND PREVIOUS THEORETICAL ANALYSIS, A PAIR OF SMALL TRANSVERSE FORCES APPLIED AT THE APPROPRIATE OPPOSITE POSITIONS OF THE CONICAL CELL IS INTRODUCED AS THE INITIAL IMPERFECTION TO STIMULATE THE DIAMOND-PATTERN DEFORMATION-MODE OF AN ANISOTROPIC CELL. THE GEOMETRIC CHANGES OF THE CELL AND THE CONTACT CONDITIONS OF THE DISPLACEMENT-CONTROLLED AXIAL COMPRESSION PROCESS ARE TAKEN INTO SIMULATION. THE NUMERICAL RESULTS ARE FOUND IN GOOD AGREEMENT WITH EXPERIMENTAL RESULTS AND THEORETICAL ANALYSIS IN THE DEFORMATION-MODE AND THE LOAD-CARRYING CAPACITY. WITH THE VERI¯ED FE MODEL, THE E®ECTS OF GEOMETRIC PARAMETERS AND OTHER FACTORS ON THE ENERGY ABSORPTION CAPACITY OF CONICAL CELLS ARE EXAMINED, SO SOME LOCAL OPTIMAL PARAMETERS ARE OBTAINED.