Evaluation of the behavior of sandwich composite structures reinforced with flax fiber and flexible cores

Name: Kitsana Khodcharad

Organization : Suranaree University of Technology. Mechanical Engineering

Email : khodcharad.k@gmail.com

Name: Kreetiwat Chaiyasin

Organization : Suranaree University of Technology. Mechatronic Engineering

Name: Wipada Boransan

Organization : Suranaree University of Technology. Center of Excellence in Innovation for Sustainable Infrastructure Development

Name: Watcharapong Patangtalo

Organization : Suranaree University of Technology. Mechanical Engineering

Name: Veena Phunpeng

Organization : Suranaree University of Technology. Mechanical Engineering

keyword: Sandwich structures (Engineering)

LCSH: Composite materials

; Flax fibers

LCSH: Reinforced plastics

LCSH: Structural analysis (Engineering)

Abstract: Sandwich composite structures are extensively utilized in diverse sectors due to their lightweight characteristics and superior strength in comparison to alternative materials, as well as their exceptional thermal and electrical insulation features. In order to meet the necessary thickness for structural purposes, it is necessary to have a core material placed between the composite face sheets. The core must efficiently support loads without substantially augmenting the total weight of the construction. The study employed a 2.5 mm thick recycled Lantor Soric core, which was combined with face sheets composed of flax fibers and an epoxy resin matrix (ER570) using the vacuum infusion technique. This technique guarantees a robust bond between the core and face sheets, eradicating any air pockets or empty spaces inside the structure. The objective of the study was to assess the performance of buildings constructed using these materials using a Universal Testing Machine (UTM) and according to ASTM C393/C393-M standards. The key variables evaluated encompassed the most suitable thickness of the core for practical uses, the stress exerted on the face sheets, the ability of the core to resist bending, and the strength of the core in resisting shear forces. The findings demonstrate that a composite sandwich structure, including a core thickness of 7.5 mm, had favorable outcomes in terms of its ability to bear loads (839.8 N), its deflection (8 mm), the stress on its face sheets (131.58 MPa), its flexural modulus (24.6988 GPa), and the shear strength of its core (3 MPa). These findings indicate that a core thickness of 7.5 mm yields optimal performance for this particular composite construction. This thickness not only ensures efficient functionality but also promotes sustainability by utilizing natural materials instead of manufactured alternatives

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

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2024

Modified: 2025-08-18

Issued: 2025-08-18

บทความ/Article

application/pdf

BibliograpyCitation : In Thai Society of Mechanical Engineers (TSME) and Kasetsart University (KU). The 14th TSME International Conference on Mechanical Engineering (TSME-ICoME14 2024) (AMM0030). Chonburi : Kasetsart University Sriracha Campus, 2024

eng

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