On the use of the Combined Loading Compression fixture to estimate the intralaminar compressive fracture toughness of composites

• Tipo: Artigo em Revista Científica Internacional
• Data: 2023

Autores

Dalli, D (Autor) Outra; Danzi, F (Autor) Outra; Campos, PJS (Autor) Outra; Arteiro, A (Autor) FEUP; Camanho, PP (Autor) Outra

Revista

Título: Engineering Fracture Mechanics

Vol. 289

ISSN: 0013-7944

Editora: Elsevier

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 1 Citação

Outras Informações

ID Authenticus: P-00Y-SAM

DOI: 10.1016/j.engfracmech.2023.109444

Abstract (EN): This study reassesses the constraint effect provided by a Combined Loading Compression (CLC) fixture on notched specimens used to measure the compressive intralaminar fracture toughness of composite materials. An experimental campaign is carried out to determine whether a variation in the specimen gauge section length would result in a significant change in the nominal strength of Double Edge Notch CLC specimens. Following the testing of six sets of different specimen geometries for both a uni-directional thermoplastic and a bi-directional woven thermoset com-posite, the effect of the gauge length is analysed using the size-effect method. Results show that nominal notched strength variation is minimal, suggesting that the CLC clamp does not effectively constrain the gripped sections against in-plane deformations. This assessment proves that the correction factor used in the determination of the R-curve needs to be computed considering the entire specimen geometry, including the gripped regions. Furthermore, the results reveal that previous characterisation campaigns conducted using end-loaded Double Edge Notch Compres-sion specimens could have led to a significant underestimation of the steady-state fracture toughness.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11