NUMERICAL SIMULATIONS OF ENERGY ABSORPTION BEHAVIOR OF THIN-WALLED ELLIPTICAL SECTIONS UNDER THE LATERAL LOADING

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Niknejad Abbas; Esfandiarfar Meysam; Shamiri Alireza

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Seminar Paper

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Seminar: CONFERENCE OF IRANIAN AEROSPACE SOCIETY
Year:2016 | Issue:15

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Title

NUMERICAL SIMULATIONS OF ENERGY ABSORPTION BEHAVIOR OF THIN-WALLED ELLIPTICAL SECTIONS UNDER THE LATERAL LOADING

Author(s)

Niknejad Abbas | Esfandiarfar Meysam | Shamiri Alireza | Issue Writer Certificate

Keywords

ENERGY ABSORPTION

ELLIPTICAL SECTION

THIN

WALLED METAL TUBE

NUMERICAL SIMULATION

LATERAL COMPRESSION

Abstract

IN THE PRESENT ARTICLE, NUMERICAL SIMULATIONS BY THE LS-DYNA SOFTWARE ARE PERFORMED TO INVESTIGATE ENERGY ABSORPTION BEHAVIOR OF METAL TUBES WITH SPECIAL ELLIPTICAL THIN-WALLED CROSS-SECTION UNDER THE LATERAL COMPRESSION LOADING. ELLIPTICAL SECTIONS HAVE TWO LONGITUDINAL ARC GROOVES. THE SPECIMENS ARE POSITIONED BETWEEN TWO SOLID CYLINDRICAL RIGID PINS WHICH ONE OF THEM MOVES IN THE VERTICAL DIRECTION AND THE OTHER ONE IS FIXED BY SIMPLE SUPPORTS AND HAS NO MOVEMENT. THEN, LATERAL COMPRESSION SIMULATION IS CARRIED OUT ON THE SPECIMENS. THE RIGID PINS ARE POSITIONED INTO THE LONGITUDINAL ARC GROOVES OF EACH SPECIMEN AND QUASI-STATIC LATERAL COMPRESSION LOAD IS APPLIED ON THE PINS AND CONSEQUENTLY, ON THE SPECIMEN IN THE DIRECTION OF CENTRAL LINE OF TWO ARC GROOVES. FOR VALIDATING THE NUMERICAL ANALYSES, TWO EXPERIMENTAL SPECIMENS WITH ELLIPTICAL CROSS-SECTION MADE OF COPPER AND BRASS ALLOY WERE PREPARED AND EXPERIMENTALLY TESTED UNDER THE LATERAL LOADING. TWO DESCRIBED FIXTURES WITH RIGID PINS WERE DESIGNED AND MANUFACTURED TO USE IN THE EXPERIMENTAL TESTS. MATERIAL PROPERTIES OF THE EXPERIMENTAL SPECIMENS WERE OBTAINED BASED ON UNIAXIAL TENSION TEST ON DUMBBELL SHAPE SPECIMENS ACCORDING TO THE STANDARD ASTM E8M. THEN, NUMERICAL SIMULATIONS WITH THE SAME CHARACTERISTICS WERE PERFORMED ON TWO PREPARED FINITE ELEMENT MODELS OF ELLIPTICAL SECTION WITH THE SAME MATERIAL AND GEOMETRICAL PROPERTIES AND THE RESULTS WERE COMPARED WITH THE CORRESPONDING EXPERIMENTAL TESTS THAT SHOW ACCURACY AND PRECISION OF THE SIMULATIONS. THEN, BY PREPARING DIFFERENT NUMERICAL MODELS OF ELLIPTICAL SPECIMENS WITH DIFFERENT GEOMETRICAL CHARACTERISTICS, EFFECTS OF SOME PARAMETERS SUCH AS SPECIMEN LENGTH, WALL THICKNESS AND WIDTH OF ELLIPTICAL CROSS-SECTION WERE STUDIED ON THEIR ENERGY ABSORPTION BEHAVIOR. NUMERICAL RESULTS SHOWED THAT ENERGY ABSORPTION CAPACITY BY THE ELLIPTICAL SECTIONS HAS A LINEAR RELATIONSHIP WITH THE SPECIMEN LENGTH. FURTHERMORE, SIMULATIONS DEMONSTRATE THAT ENERGY ABSORPTION CAPABILITY BY THE SPECIMENS IS DEPENDENT ON THE SECOND POWER OF SPECIMEN WALL THICKNESS; AND WHEN WALL THICKNESS ENHANCES, ABSORBED ENERGY AND ABSORBED ENERGY/MASS INCREASE. ALSO, IT IS FOUND THAT WHEN WIDTH OF ELLIPTICAL CROSS-SECTION REDUCES, TOTAL ABSORBED ENERGY ENHANCES. THIS ARTICLE PRESENTS SOME METHODS TO DESIGN AN ELLIPTICAL ENERGY ABSORBER WITH OPTIMUM CONDITION AND WITH LESS WEIGHT FOR NEUTRALIZING SUDDEN IMPACTS ON AEROSPACE STRUCTURES.

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APA: Copy

Niknejad, Abbas, Esfandiarfar, Meysam, & Shamiri, Alireza. (2016). NUMERICAL SIMULATIONS OF ENERGY ABSORPTION BEHAVIOR OF THIN-WALLED ELLIPTICAL SECTIONS UNDER THE LATERAL LOADING. CONFERENCE OF IRANIAN AEROSPACE SOCIETY. SID. https://sid.ir/paper/947954/en

Vancouver: Copy

Niknejad Abbas, Esfandiarfar Meysam, Shamiri Alireza. NUMERICAL SIMULATIONS OF ENERGY ABSORPTION BEHAVIOR OF THIN-WALLED ELLIPTICAL SECTIONS UNDER THE LATERAL LOADING. 2016. Available from: https://sid.ir/paper/947954/en

IEEE: Copy

Abbas Niknejad, Meysam Esfandiarfar, and Alireza Shamiri, “NUMERICAL SIMULATIONS OF ENERGY ABSORPTION BEHAVIOR OF THIN-WALLED ELLIPTICAL SECTIONS UNDER THE LATERAL LOADING,” presented at the CONFERENCE OF IRANIAN AEROSPACE SOCIETY. 2016, [Online]. Available: https://sid.ir/paper/947954/en

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