ออกแบบและวิเคราะห์พฤติกรรมการดูดซับพลังงานของตัวลดทอนแรงกระแทกที่ใช้สำหรับเครื่องทดสอบการชนโดยใช้แบบจำลองไฟไนต์เอลิเมนต์ไม่เชิงเส้นแบบชัดแจ้ง

Chaiyanon Sertikun; Akarapon Rattanajun; Kantapat Rukphum; Punawat Busadee; Chartchay Chumchan

Authors

Chaiyanon Sertikun
Akarapon Rattanajun
Kantapat Rukphum
Punawat Busadee
Chartchay Chumchan King Mongkut's University of Technology North Bangkok

Keywords:

Impact Attenuator, Crash Simulation, Finite Element Method, Explicit Dynamics, EN 1789:2020

Abstract

The purpose of this research was to design and analyze the energy absorption behavior of impact attenuator for ambulance crash tester by using an explicit nonlinear finite element model. The impact attenuator structure can be used for the dynamic collision tester for ambulance crashworthiness testing at approximately 30 km/h according to EN 1789:2020 standard. The design was intended to be simple and low in production costs. Hence, the impact attenuator structure was designed to absorb collision from a rigid mass of 1400 kg with the standard crash speed. The geometry was designed by using 15 tubes, and the tubes were arranged in-line longitudinally with a pitch length of 60 mm, which deformation allows axial deformation. The outer diameter of the tubes is 34 mm, the thickness is 1.2 mm, and the total length is 600 mm. The single tube is welded with two different materials by using the tip as 100 mm long aluminum AL5083-O and the rest 500 mm long with steel SS400 (JIS). In the study, an explicit nonlinear finite element model was modeled to analyze the absorption of collision energy as acceleration. The modeling method was validated by comparing the collision acceleration with experimental data, which showed that the result was good tendency. Finally, the result of the collision energy absorption behavior analysis of the impact attenuator structure found that the acceleration was consistent with the acceleration profile according to the testing standard.

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