Effects of carbon fiber stacking sequence on torsional stiffness per weight ratio of formula student semi-monocoque chassis structure

Name: Tanic Leunanonchai

Organization : King Mongkut's University of Technology Thonburi. Faculty of Engineering

Name: Kitchanon Ruangjirakit

Organization : King Mongkut's University of Technology Thonburi. Faculty of Engineering

Email : kitchanon.rua@kmutt.ac.th

Name: Surachate Chutima

Organization : King Mongkut's University of Technology Thonburi. Faculty of Engineering

keyword: Formula Student

ThaSH: Carbon fibers

; Torsional Stiffness

ThaSH: Automobiles, Racing

ThaSH: Finite element method

Abstract: In the design of Formula Student chassis structure, torsional stiffness and weight are the main factors which affect vehicle's performance. At present, the most popular type of chassis structure is space frame as it is inexpensive and simple. However, the main drawback of the space frame structure is its low torsional stiffness per weight ratio, which could be improved by replacing the steel tubes with sandwich semi-monocoque chassis structure consisting of carbon composite faces and aluminum honeycomb core. Therefore, this research focuses on the effects of different stacking sequences of carbon fiber composite faces that located on both sides of the 15.8 mm-thick aluminum honeycomb core. The responses of semi-monocoque chassis under torsional load are evaluated by Finite Element Code and 3 stacking sequences of carbon fiber considered herein are [09/Core/09], [F6/Core/F6] and [F/06/F/Core/F/06/F], which F indicates bi-directional fabric and 0 refers to unidirectional fiber. The results suggest that pure bi-directional fabric lay-up [F6/Core/F6] gives the highest torsional stiffness per weight ratio which is higher than the [09/Core/09] and [F/06/F/Core/F/06/F] lay-ups by 144 percent and 46 percent, respectively. Moreover, the torsional stiffness of [F6/Core/F6] lay-up increases from the current space frame structure made from AISI 4130 steel by approximately 5 times.

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

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2017

Modified: 2026-02-02

Issued: 2026-02-02

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application/pdf

BibliograpyCitation : In King Mongkut's University of Technology North Bangkok Faculty of Engineering. The 8th TSME International Conference on Mechanical Engineering 2017 (TSME-ICoME8) (p.109-118) Bangkok : King Mongkut's University of Technology North Bangkok

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