Linear translaminar fracture characterization of additive manufactured continuous carbon fiber reinforced thermoplastic

Author(s)

Lamin, Weiller M. ^[1] ; Bussamra, Flavio L. S. ^[1] ; Ferreira, Rafael T. L. ^[1] ; Sales, Rita C. M. ^[2] ; Baldo, Jr., Jose E. ^[3]

Affiliation

^[1] Inst Tecnol Aeronaut, Dept Aeronaut Engn, Praca Marechal do Ar Eduardo Gomes 50, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[2] Fac Tecnol Sao Jose dos Campos Prof Jessen Vidal, Aeronaut Struct Lab, Sao Jose Dos Campos, SP - Brazil

^[3] Inst Pesquisas Tecnol, Lightweight Struct Lab, Sao Jose Dos Campos, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS; JUN 2021.
• Web of Science Citations: 0

Abstract

This work presents the experimental determination of fracture mechanics parameters of composite specimens manufactured by fused filament fabrication (FFF) with continuous carbon fiber reinforced thermoplastic filaments, based on Linear Elastic Fracture Mechanics (LEFM). The critical mode I translaminar fracture toughness (K-Ic) and the critical energy release rate (G(Ic)) are found for unidirectional and cross-ply laminates. The specimens were submitted to quasi-static tensile testing. Digital Image Correlation (DIC) is used to find the stress field. The stress fields around the crack tip are compared to linear elastic finite element simulations. The results demonstrate the magnitude of fracture toughness is in the same range as for polymers and some metals, depending on lay-up configuration. Besides, fractographic analyses show some typical features as river lines, fiber impression, fiber pulls-out and porosity aspects. (AU)

• FAPESP's process: 15/00159-5 - Hierarchical design of composite materials for production by tridimensional printing
• Grantee: Rafael Thiago Luiz Ferreira
• Support Opportunities: Regular Research Grants