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| dc.contributor.author | Aklilu, Alemneh | |
| dc.date.accessioned | 2022-12-31T08:30:33Z | |
| dc.date.available | 2022-12-31T08:30:33Z | |
| dc.date.issued | 2022-08 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/14823 | |
| dc.description.abstract | Vehicle rollover accidents frequently result in occupant head-roof interaction, which transfers the load to the spinal column and induces severe injuries. This study aims to evaluate the response of lower lumbar spinal intervertebral disc damage and enhance passive safety mechanisms in minibus rollover accidents. After an in-depth studying of the upper body biomechanics of the occupant, a hybrid model that incorporated finite element analysis and lumped parameter model was developed and validated with previous works of literature. A minibus rollover accident scenario is mathematically computed, and the whole configuration analysis is numerically conducted using LSDYNA software. With given criteria of displacement increment 0.582mm, pressure 1.87MPa, and Von-Mise’s stress 1.27MPa is recorded and damage of the intervertebral disc with a roof intrusion 0.455m/s 2 acceleration. In addition to a variety of passive safety features, padding materials are introduced to the roof body components to mitigate intervertebral disc injury. The mechanical properties of the utilized padding materials are numerically validated with other work. CONFOR green pad shows the best performance followed by polyurethane foam, Micro-agglomerated cork, Dax, and IMPAXX. Which dramatically reduced intervertebral disc damage by limiting displacement by 59.27%, 57.2% of pressure drop, and lowering Von-Mise's stress by 66% compared with no padding. Furthermore, this research investigated the bioinspired geometry of the trapezoidal-shaped pad that contributes an intervertebral disc displacement reduction of 4%, reduced stress by 4.6%, and 3.785% pressure is dropped. As a result, the incorporation of padding materials in minibus has yielded promising results in terms of improving the reduction of occupant lower lumbar spinal intervertebral disc impairment. Keywords: Padding materials; passive safety; rollover accident; finite element analysis; bioinspired; biomechanics; hybrid model; LS-DYNA | en_US |
| dc.language.iso | en_US | en_US |
| dc.subject | MECHANICAL AND INDUSTRIAL ENGINEERING | en_US |
| dc.title | A numerical Investigation on human lumber intervertebral disc response to a minibus rollover accident of head to roof interaction and the effect of padding materials with bio-inspired geometries | en_US |
| dc.type | Thesis | en_US |
