A micro-mechanics perspective to the invariant-based approach to stiffness

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Arteiro, A (Autor) FEUP; Pereira, LF (Autor) Outra; Bessa, MA (Autor) Outra; Furtado, C (Autor) FEUP; Camanho, PP (Autor) FEUP

Revista

Título: Composites Science and Technology

Vol. 176

Páginas: 72-80

ISSN: 0266-3538

Editora: Elsevier

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 12 Citações

Outras Informações

ID Authenticus: P-00Q-F6N

DOI: 10.1016/j.compscitech.2019.04.002

Abstract (EN): To simplify the analysis and characterisation of composite laminates, an invariant-based approach to stiffness that takes the trace of the plane stress stiffness matrix as a material property was recently proposed. In the present work, a study based on micro-mechanical models brings new insight to this invariant-based approach. The Rule of Mixtures and the Halpin-Tsai models are used to establish the relations between the fibre volume fraction, the fibre/matrix stiffness ratios, and the trace-normalised engineering constants of unidirectional laminae and multidirectional laminates. For sufficiently high longitudinal fibre/matrix stiffness ratios and for fibre volume fractions between 50% and 70%, typical of advanced CFRPs, the variation of the trace-normalised longitudinal Young's modulus is within 6% for unidirectional laminae and within 1% for multidirectional laminates, supporting the definition of an invariant-based approach to stiffness based on a Master Ply concept and laminate factors derived thereof, defining clearly a domain of applicability of the invariant theory and confirming the empirical observations of the past.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9