BUCKLING OF CRACKED CONES SUBJECTED TO AXIAL COMPRESSION

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OLAWALE IFAYEFUNMI
FAIRUZ MARDHIAH MAHIDAN

Abstract

THE INFLUENCE OF CRACK GEOMETRY ON THE BUCKLING LOAD OF AXIALLY COMPRESSED MILD STEEL CONES WAS PRESENTED IN THIS PAPER. THE FOLLOWING GEOMETRICAL PARAMETER WAS USED: BOTTOM RADIUS-TO-TOP RADIUS RATIO, R2/R1=2.0; TOP RADIUS-TO-THICKNESS RATIO, R1/T=25; AXIAL LENGTH-TO-BOTTOM RADIUS RATIO, L/R2=2.24; NOMINAL SHELL THICKNESS, T=1MM; CONE ANGLE, Β=12.6°. THE LOCAL BUCKLING PHENOMENON WAS INVESTIGATED THROUGH A SERIES OF NUMERICAL COMPUTATIONS (50 ≤ R1/T ≤ 2000). NUMERICAL RESULTS SHOW THAT CRACK GEOMETRY (I.E., LENGTH AND ORIENTATION) INFLUENCES THE BUCKLING STRENGTH OF THE CONES DIFFERENTLY. FOR INSTANCE, AS THE CRACK LENGTH INCREASE, THE LOADING CAPACITY OF CONES DROPS; CONES WITH A CIRCUMFERENTIAL CRACK (0°) DISPLAYS THE MOST SEVERE DROP. AS THE CRACK ORIENTATION INCREASES (FROM 0° TO 90°) THE BUCKLING STRENGTH OF THE CRACKED CONES WITH CRACK LENGTH GREATER THAN 1 INCREASES. WHEREAS, FOR CRACKED CONES WITH CRACK LENGTH LESS THAN 1, INCREASING THE CRACK ORIENTATION HAS LITTLE OR NO EFFECT ON THE BUCKLING STRENGTH. HENCE, IT CAN BE SAID THAT CRACK ORIENTATION HAS A SECONDARY EFFECT ON THE BUCKLING OF CRACKED CONICAL SHELLS

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