Development of Bi-hexagonal hybrid crash box subjected to axial loading for enhancement of crashworthiness




Bi-hexagonal hybrid crash box, energy absorption, deformation pattern, axial loading


Crash box design had been developed to increase crashwortiness performance. The crash box cross section is one important parameter to increase the energy absorption as crashwortiness performance. In the previous study, hexagonal cross section provide the higher energy absorption than other cross section. One of strategy to increase cross section is using two cross section put together in one component of crash box design. Bi-tubular crash box shows higher energy absorption with easy manufacture opportunity. In other study, hybrid crash box is investigated to reduce crash box mass. In this study, development of bi-hexagonal hybrid crash box subjected to axial loading to enhance crashworthiness were investigated. Analysis of crash box design is developed by using computer simulation with ANSYS Workbench 19.2. The crash box materials used are Aluminum Alloy and carbon-epoxy woven. The material modeling in the crash box is assumed as deformable body while the impactor is a rigid body. The axial loading is modelled by setting impactor impact the crash box with a speed of 7.67 m/s. Fixed support is set on the bottom of crash box. Nine of frontal test models were simulated for the bi-hexagonal hybrid crash box with different layups orientation angle and composite hexagonal tube diameter. Energy absorption and deformation patterns were observed. The results indicated that the highest energy absorption and specific energy absorption is occured on the A60 model with layups orientation angle of [0/60/0/60] and composite hexagonal tube diameter of 41 mm are 3693.8 J and 19.121 kJ/kg. The deformation pattern in the aluminum part is diamond mode, while in the composite part, the deformation pattern produce transverse shearing, lamina bending, brittle fracturing and local buckling mode

Supporting Agency

  • This study was supported by Professor Accelerated Grant from Engineering Faculty, Brawijaya University, Malang, Indonesia. We also thank Design and System Engineering laboratory, Mechanical Engineering Department, Brawijaya University for providing ANSYS Research license.

Author Biographies

Moch Agus Choiron, Brawijaya University

Doctor of Engineering, Professor

Department of Mechanical Engineering

Delia Hani Wakhidah, Brawijaya University

Graduate Student

Department of Mechanical Engineering

Nurchajat, State Polytechnic of Malang

Associate Professor

Department of Mechanical Engineering


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Development of Bi-hexagonal hybrid crash box subjected to axial loading for enhancement of crashworthiness




How to Cite

Choiron, M. A., Wakhidah, D. H., & Nurchajat. (2023). Development of Bi-hexagonal hybrid crash box subjected to axial loading for enhancement of crashworthiness. Eastern-European Journal of Enterprise Technologies, 1(1 (121), 51–57.



Engineering technological systems