Loading Rate Influence on Delamination Behavior of Reinforced ENF Specimens by Additively Manufactured Interlayer

• Type: Article in International Scientific Journal
• Date: 2025

Authors

Salamat-Talab, M (Author) Other; Kazemi, H (Author) Other; Akhavan-Safar, A (Author) Other; da Silva, LFM (Author) FEUP

Journal

The Journal is awaiting validation by the Administrative Services.

Title: JOURNAL OF COMPOSITES SCIENCE

Final page: 494

ISSN: 2504-477X

Other information

Authenticus ID: P-01A-1PP

DOI: 10.3390/jcs9090494

Abstract (EN): <jats:p>Laminated composites have distinct mechanical properties that suit various industries. However, varying loading rates during their service life increase their vulnerability to one of their main weaknesses, delamination. Moreover, some interlayers that are used to improve delamination resistance are (often) limited, expensive, and pollute the environment. Therefore, in this study, the performance of additively manufactured organic wood/PLA interlayers was examined in terms of the mode II interlaminar fracture toughness (ILFT) of glass/epoxy composites under 1, 50, and 100 mm/min loading rates, aiming to address these challenges. The experimental findings showed that in non-interleaved specimens, increasing the loading rate improved delamination resistance, primarily because of the distributed shear hackles across the delamination surfaces. However, incorporating 3D-printed interlayers improved ILFT by 76% (at 1 mm/min) and 23% (at 50 mm/min), compared to counterparts without interlayers, driven by synergistic mechanisms, including crack arrest and shear hackle. In contrast, a loading rate of 100 mm/min resulted in a reduction in ILFT of interleaved specimens compared to their counterparts without interlayers due to the inherent brittleness of the interlayers. Also, fractography analyses revealed that shear hackles were the primary fracture feature in all tested conditions. However, in interleaved specimens, an additional mechanism, filament breakage, became evident.</jats:p>

Language: English

Type (Professor's evaluation): Scientific