Investigation of the effect of trigger arrangement pattern on energy absorption properties of thin-walled cylindrical tubes

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Investigation of the effect of trigger arrangement pattern on energy absorption properties of thin-walled cylindrical tubes

ارائه دهنده: Provider: Majid Zonnori

اساتید راهنما: Supervisors: Ali Alavi Nia

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Amir Hossein Mahmoodi and Hashem Mazaheri

زمان و تاریخ ارائه: Time and date of presentation: 2024

مکان ارائه: Place of presentation: Place of presentation class 7

چکیده: Abstract: One of the most efficient energy absorption devices are thin-walled tubes. An energy absorber is a structure that reduces the damages and losses of accidents by dissipating the kinetic energy of the colliding bodies into the heat and plastic deformation. In this thesis, the effect of the arrangement of triggers on the energy absorption characteristics of cylindrical thin-walled tubes has been investigated. These triggers are in the form of square, triangle, circle, rhombus and inverted triangle holes. Therefore, parameters such as the number of triggers in each row, the number of rows, the distance between the rows and the distance of the first row from the upper end of the cylinder were considered as continuous quantitative variables; and the type of trigger as a qualitative variable. The characteristics investigated in these structures were specific energy absorption (SEA) and crush force efficiency (CFE). After selecting different patterns of trigger placement and making the samples, the structures were subjected to quasi-static axial loading. Also, in order to investigate the influencing factors on the energy absorption characteristics, simulation with LS-DYNA software carried out. In addition, in order to obtain the optimal amount of the desired factors, Minitab software and the response surface method were used and the optimal structure was determined. The results of this thesis showed that by adding the trigger to the energy absorber, the initial maximum force decreases. Specific energy absorption and crush force efficiency of the optimal sample decreased by 4.4% and increased by 40%, respectively, compared to the simple tube. The specimen with 4 square triggers with a distance from the upper end equal to 9.29 mm had the highest specific energy absorption, which is 81.4% more than the simple tube. The inverted triangle type trigger caused the greatest decrease in initial maximum force compared to other types of triggers; the amount of this decrease was 83.2% compared to the simple tube

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