Deformation characteristics and formability of a heavy-tow unidirectional non-crimp fabric (UD-NCF) was studied. The fabric response under in-plane shear and biaxial tension loading (experienced during forming operations) was first investigated. Local deformations captured by measuring tensile/compressive strains in the stitching segments traversing the carbon fiber tows was correlated to the fabric three-stage macroscopic response during shear tests. Biaxial tension tests were performed at room and elevated temperatures with different displacement ratios to mimic typical preforming processes. Variations in biaxial displacement ratio revealed the interdependency of the fabric orthogonal tensile deformation modes, while temperature did not influence the response. Next, single layer hemispherical and flat punch draping experiments were performed to monitor defects (wrinkling) and capture strain contours, which correlated with in-plane shear and biaxial tension deformations. The results yield an improved understanding of the complex multiscale deformation modes for the heavy-tow UD-NCF and represent important data sets for constitutive models.

Deformation characteristics and formability of a tricot-stitched carbon fiber unidirectional non-crimp fabric

Carvelli V.;
2021-01-01

Abstract

Deformation characteristics and formability of a heavy-tow unidirectional non-crimp fabric (UD-NCF) was studied. The fabric response under in-plane shear and biaxial tension loading (experienced during forming operations) was first investigated. Local deformations captured by measuring tensile/compressive strains in the stitching segments traversing the carbon fiber tows was correlated to the fabric three-stage macroscopic response during shear tests. Biaxial tension tests were performed at room and elevated temperatures with different displacement ratios to mimic typical preforming processes. Variations in biaxial displacement ratio revealed the interdependency of the fabric orthogonal tensile deformation modes, while temperature did not influence the response. Next, single layer hemispherical and flat punch draping experiments were performed to monitor defects (wrinkling) and capture strain contours, which correlated with in-plane shear and biaxial tension deformations. The results yield an improved understanding of the complex multiscale deformation modes for the heavy-tow UD-NCF and represent important data sets for constitutive models.
2021
Mechanical properties
Microstructural analysis
Non-crimp fabric (NCF)
Preforming
File in questo prodotto:
File Dimensione Formato  
Carvelli_Composites A_2021.pdf

Open Access dal 02/06/2023

Descrizione: Carvelli_Composites A_2021
: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 1.95 MB
Formato Adobe PDF
1.95 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1190513
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 8
social impact