Scholarlink

<p>This study introduces a novel fabrication method for composite laminates via adhesive bonding of discrete thin laminate units, aiming to enhance internal quality while largely preserving their flexural performance. To validate the feasibility of this approach, the influence of bonding surfaces (BS) on flexural behavior was first investigated using laminates with varying numbers of BS (B0, B1, B2, B3) through bending tests and three-dimensional finite element analysis. Results indicated that as the number of BS increased, the flexural load of laminated structures increased accordingly, although flexural strength and modulus showed some reduction (≤ 7.13%). This increase in load is attributed to the increased laminate thickness, while the slight reductions in strength and modulus reflect normalized material properties. Compared to the reference specimen without BS (B0), which failed through tensile, compressive, and delamination damage, specimens with one to three bonding interfaces (B1, B2, and B3, respectively) all exhibited notable debonding failure. In particular, specimen B2, with two bonding surfaces located at 1/4 and 3/4 of the laminate thickness, displayed the most complex failure mode yet demonstrated the most stable yielding and the highest energy absorption before failure (7179.44&#xa0;mJ vs. 7002.27&#xa0;mJ for B0). Based on these findings, the method was further applied to fabricate 64-ply thick laminates, with a thickness of over 8.00&#xa0;mm. Compared to the 64-ply thick laminate without BS (TB0), the thick laminate with two bonding surfaces (TB2) achieved a dramatic reduction in both the number and size of internal voids, decreasing the areal porosity from 9.867% to 4.735%. These results validate that the proposed discrete-unit adhesive bonding method effectively minimizes manufacturing defects, despite causing a modest reduction in flexural strength and modulus. This trade-off, involving a minor compromise in flexural performance for significant improvements in internal quality and manufacturing flexibility, presents a promising strategy for high-quality thick composite laminate fabrication.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A Discrete-Unit Adhesive Bonding Method for Fabrication of Composite Laminates: Effects on Flexural Performance and Internal Quality

  • 期刊论文

  • 发表日期：

    2026年7月2日

查看全文
  • Caixia Jia,
  • Quanyong Tian,
  • Qian Wang,
  • Zhixin Li

摘要

This study introduces a novel fabrication method for composite laminates via adhesive bonding of discrete thin laminate units, aiming to enhance internal quality while largely preserving their flexural performance. To validate the feasibility of this approach, the influence of bonding surfaces (BS) on flexural behavior was first investigated using laminates with varying numbers of BS (B0, B1, B2, B3) through bending tests and three-dimensional finite element analysis. Results indicated that as the number of BS increased, the flexural load of laminated structures increased accordingly, although flexural strength and modulus showed some reduction (≤ 7.13%). This increase in load is attributed to the increased laminate thickness, while the slight reductions in strength and modulus reflect normalized material properties. Compared to the reference specimen without BS (B0), which failed through tensile, compressive, and delamination damage, specimens with one to three bonding interfaces (B1, B2, and B3, respectively) all exhibited notable debonding failure. In particular, specimen B2, with two bonding surfaces located at 1/4 and 3/4 of the laminate thickness, displayed the most complex failure mode yet demonstrated the most stable yielding and the highest energy absorption before failure (7179.44 mJ vs. 7002.27 mJ for B0). Based on these findings, the method was further applied to fabricate 64-ply thick laminates, with a thickness of over 8.00 mm. Compared to the 64-ply thick laminate without BS (TB0), the thick laminate with two bonding surfaces (TB2) achieved a dramatic reduction in both the number and size of internal voids, decreasing the areal porosity from 9.867% to 4.735%. These results validate that the proposed discrete-unit adhesive bonding method effectively minimizes manufacturing defects, despite causing a modest reduction in flexural strength and modulus. This trade-off, involving a minor compromise in flexural performance for significant improvements in internal quality and manufacturing flexibility, presents a promising strategy for high-quality thick composite laminate fabrication.

Graphical Abstract