A shear-lag analysis of stress transfer through a cohesive fibre-matrix interface

Zuorong Chen, Wenyi Yan

Research output: Contribution to conferencePaper


A shear-lag model with a cohesive fibre-matrix interface is presented for the analysis of stress transfer between the fibre and the matrix in unidirectional fibre-reinforced composites. The fibre-matrix interface is described by an irreversible bilinear cohesive traction-separation law. The interface is initially perfectly bonded and linear elastic. Beyond the elastic deformation regime during fibre pull-out, interfacial damage initiates and evolves progressively, exhibiting a reduction in the shear strength and a degradation of the shear stiffness. The governing equations for the interfacial shear stress and the axial stress in the fibre are derived. Analytical solutions of stress distribution and evolution are obtained using a shear strength-based debonding criterion. Depending on the parameters of the fibre-matrix-cohesive interface system, the stresses in the cohesive interface damage process zone may obey two different types of governing equations.

Original languageEnglish
Publication statusPublished - 1 Jan 2017
EventInternational Conference on Composite Materials 2017 - Xi'an, China
Duration: 20 Aug 201725 Aug 2017
Conference number: 21st
https://www.iccm-central.org/Proceedings/ICCM21proceedings/ (Proceedings)


ConferenceInternational Conference on Composite Materials 2017
Abbreviated titleICCM 2017
Internet address


  • Cohesive interface
  • Interfacial debonding
  • Shear-lag
  • Stress transfer

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