Determination of corrugated core sandwich panels elastic constant based on three different experimental methods and effect of structural integrity on flexural properties

• Published in: SN applied sciences 2021-04, Vol.3 (4), p.450, Article 450
• Main Authors: Abedzade Atar, Hamid, Zarrebini, Mohammad, Hasani, Hossein, Rezaeepazhand, Jalil
• Format: Article
• Language: English
• Subjects: Applied and Technical Physics; Bearing strength; Bond strength; Carrying capacity; Chemistry/Food Science; Corrugation; Earth Sciences; Elastic properties; Engineering; Environment; Experimental methods; Fabrics; Geometry; Interdisciplinary: Lightweight Structures: Advanced Manufacturing and Materials for the Built Environment; Knitting; Load carrying capacity; Materials Science; Modulus of elasticity; Needlework; Raw materials; Research Article; Research methodology; Resins; Rigidity; Sandwich panels; Shear strength; Shear tests; Statistical analysis; Stiffness; Structural integrity; Textile composites; Transverse shear; Weft; Yarn
• ISSN: 2523-3963; 2523-3971
• DOI: 10.1007/s42452-021-04424-8

This study deals with the investigation of flexural stiffness and transverse shear rigidity in the direction of corrugation of the integrated and non-integrated corrugated core sandwich panels with the rectangular core. The non-integrated sandwich panels were reinforced with conventional 2-D fabrics in which resin provides the bond between core and skins. The integrated sandwich panels were reinforced with 3-D weft knitted fabrics in which bonding of the core wall to skins was carried out by combined efforts of knitted loop and resin. Using weft knitting technical capabilities, samples of the integrated and non-integrated structures were manufactured with the uppermost degree of resemblance in terms of geometry and mass. Flexural stiffness and transverse shear rigidity of the structures based on the known and unknown facing modulus of ASTM D7250 standard and Nordstrand–Carlsson methods were calculated. The estimated elastic constants based on unknown facing modulus and the Nordstrand–Carlsson methods were found to be highly compatible. However, the unknown facing modulus method is prone to disclose the statistical significant differences between the elastic constants of the structures with fewer tests. Regarding the unknown facing modulus method, it was found that the flexural stiffness and transverse shear rigidity of the non-integrated structure in the direction of corrugation were higher than those of the integrated structure. Results also indicated that the load-carrying capacity in the direction of corrugation was significantly higher in case of the non-integrated rectangular core structure compared with that of the integrated structure.