Study influence of honeycomb foam filled structural parameters on impact responses using reduced order modelling

Name: Kamonchanok Hirunwat

keyword: Expanded polystyrene.

LCSH: Finite element method.

; Honeycomb foam.

LCSH: Honeycomb structures.

; Reduced order models.

LCSH: Electric vehicles -- Batteries.

Abstract: The honeycomb structure filled with Expanded Polystyrene (EPS) foam presents a promising choice for electric vehicle battery enclosure design due to its lightweight and superior energy absorption capability. However, a comprehensive understanding of the mechanical behavior of both the honeycomb and EPS foam under impact load is essential. This study aims to investigate the influence of honeycomb structural parameters and the volume fraction of foam-filled on crashworthiness performance. A combined finite element simulations and machine learning approach was proposed to develop a so called reduced ordered model (ROM). The predictive capability of the ROM was reasonably accurate, with only a small discrepancy when compared with the corresponding finite element simulation result. However, the prediction capabilities of this ROM are limited to EPS foam with a density of 40 kg/m3 and the symmetrical arrangement of foam within the honeycomb structure. The validated ROM was used to predict the initial peak force, mean force, initial peak acceleration, and specific energy absorption (SEA) based on various input values of cell size, foil thickness, and volume fraction of foam for parametric study and optimization. The results indicate that the initial peak force, mean force, and initial peak acceleration increase with increasing cell size, foil thickness, and volume fraction of foam. In cases where the honeycomb has a small cell size or thin foil thickness, the volume fraction of foam has minimal impact on the initial peak force. Additionally, the mean force shows a minor correlation with the cell size and volume fraction of foam when the foil thickness is thin. On the other hand, the SEA decreases with increasing cell size, foil thickness, and volume fraction of foam. The SEA displays a slight correlation with thickness, but it demonstrates a significant dependency on the cell size and volume fraction of foam. Furthermore, the predicted results generated from the ROM were analyzed using the Technique for Order Preference by Similarity to Ideal Solution to propose the optimal configuration of the honeycomb foam-filled structure suitable for use in battery enclosures. Considering the crashworthiness aspect in vehicles, the analysis suggested a cell size of 5 mm, a foil thickness of 0.1 mm, and a volume fraction of foam of 50%. This configuration demonstrated high crush force efficiency, high Specific Energy Absorption (SEA), high strength, and low peak acceleration.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Name: Julaluk Carmai

Role: thesis advisor.

Email : julaluk.c@tggs.kmutnb.ac.th

Name: Anchalee Manonukul

Role: thesis advisor.

Created: 2022

Modified: 2567-09-18

Issued: 2024-09-18

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Mechanical and Automotive Engineering (International Program)

Grantor: King Mongkut's University of Technology North Bangkok

©copyrights King Mongkut's University of Technology North Bangkok

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