From nature to engineering: A comprehensive mechanical response analysis of novel bio-inspired CFRP adhesive joints

IF 8.3 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2026-05-01 Epub Date: 2026-02-18 DOI:10.1016/j.tws.2026.114675

Hossein Malekinejad , Ricardo JC. Carbas , Eduardo AS. Marques , Lucas FM. da Silva

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引用次数: 0

Abstract

For effective adhesive joint design, both strength and toughness must be considered. This work investigates bio-inspired carbon fiber reinforced polymer (CFRP) substrates, replicating the natural architecture of the dactyl club, to enhance the mechanical performance of bonded joints. The CFRP substrates were stacked in gradually increasing ply angles to mimic the dactyl club microstructure. Three additional stacking sequences were considered: conventional helicoidal (constant ply angle change), unidirectional (UD), and quasi-isotropic (QI). To evaluate the proposed novel gradual helicoidal concept, composite single-lap joints (SLJs) with all stacking sequences were tested under quasi-static four-point bending. The best-performing configurations (gradual helicoidal and UD) along with QI joints, were subsequently tested under four-point bending fatigue. Cohesive element-based numerical simulations were also employed to predict the influence of stacking sequence on joint strength and toughness. Results showed that maximum load was similar for gradual helicoidal and UD joints and higher than for conventional helicoidal and QI SLJs. The energy absorption capacity of gradual helicoidal joints was significantly improved, with 46% and 115% higher values compared to UD and QI joints, respectively. Under fatigue loading, gradual helicoidal (G-type) single-lap joints exhibited enhanced damage tolerance. At load levels of 43% and 50%, the fatigue tests for the G-type joints were terminated without failure. At these load levels, the G-type joints sustained 140% and 207% more cycles, respectively, than the UD-type joints, which failed. After fatigue loading, the G-type joints retained high residual strength, corresponding to 82% and 70% of their static strength.

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从自然到工程：新型仿生CFRP粘接接头的综合力学响应分析

为了进行有效的粘接设计，必须同时考虑强度和韧性。这项工作研究了仿生碳纤维增强聚合物（CFRP）基板，复制了dactyl俱乐部的自然结构，以提高粘合关节的机械性能。将CFRP基板以逐渐增大的铺层角度堆叠，模拟dactyl棒状结构。另外考虑了三种堆叠顺序：常规螺旋（铺层角度恒定变化）、单向（UD）和准各向同性（QI）。为了评价所提出的渐进式螺旋结构的新概念，在准静态四点弯曲条件下对具有所有堆叠顺序的复合材料单搭接接头进行了测试。随后在四点弯曲疲劳下测试了性能最佳的配置（渐进性螺旋形和UD形）以及QI关节。基于内聚元素的数值模拟预测了堆砌顺序对接头强度和韧性的影响。结果表明，渐进式螺旋关节和UD关节的最大载荷相似，但高于常规螺旋关节和QI关节的最大载荷。渐进式螺旋关节的吸能能力明显提高，比UD和QI关节分别提高46%和115%。在疲劳载荷作用下，渐进式螺旋（g型）单搭接具有较强的损伤容忍度。在43%和50%载荷水平下，g型接头的疲劳试验没有失效。在这些荷载水平下，g型接头比失效的ud型接头分别多承受140%和207%的循环次数。疲劳加载后，g型接头的残余强度较高，分别为其静强度的82%和70%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.