Effects of Stitching Technique and Lay-Up Configuration on Mechanical Properties of Bamboo Strip Composites

Document Type

Article

Publication Date

1-1-2025

Abstract

Bamboo strip composites were fabricated using vacuum infusion process (VIP), with twodimensional woven fabrics prepared by stitching technique as reinforcements. The effects of stitch spacing and layup configuration (symmetrical and staggered forming) on mechanical properties were investigated. Results showed that at 8 cm stitch spacing, unidirectional composites in the 0° direction exhibited increased tensile, flexural, and impact strengths by 7.6%, 5.6%, and 15.3%, respectively, compared to non-stitched samples. Furthermore, the staggered distribution of stitching threads across layers effectively mitigated stress concentration. However, excessively small stitch spacing causes damages in bamboo strips and resin-rich zones, reducing mechanical properties in the 0° direction. Furthermore, layup configuration significantly influences mechanical performance. Tensile properties improve with increasing concentration of unidirectional fiber layers, and the [90/0/0]s configuration exhibits optimal performance in 0° direction, with tensile strength and modulus reaching 183 MPa and 20.4 GPa, respectively. Flexural properties are governed by surface layer orientation, with the [0/0/90]s configuration showing maximum flexural strength (320.4 MPa) and modulus (17.1 GPa) in 0° direction, along with superior deformation resistance. The [90/0/0]s configuration demonstrates optimal impact strength (91.4 kJ/m²) in 0° direction, attributed to the continuous distribution of 0° bamboo strip that effectively mitigates stress concentration. Various layup configuration effectively affect the mechanical properties of bamboo strip composites. This study provides design basis for the engineering application of bamboo-strip composites through the optimization of both process and structure.

Publication Source (Journal or Book title)

Chinese Journal of Wood Science and Technology

First Page

68

Last Page

77

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