Traction–separation law for bridged cracks at immiscible polymers interface

• Published in: Mechanics of materials 2024-07, Vol.194, p.104998, Article 104998
• Main Author: Perelmuter, M.
• Format: Article
• Language: English
• Subjects: Crack bridged zone; Fracture toughness; Immiscible polymers; Integral-differential equations; One- and many-stitch bonds; Traction–separation law
• ISSN: 0167-6636; 1872-7743
• DOI: 10.1016/j.mechmat.2024.104998

A traction–separation law for bonds at cracks bridged zones at immiscible polymers interface is developed. It is assumed that bonds at the crack bridged zone between different polymers are formed by bundles of the polymer molecules–promoter of adhesion. It is taken into account that molecules of the polymer-promoter can form one-stitch and many-stitch bonds between polymers. Nonlinear deformation curves of bonds at the crack bridged zone were obtained on this basis. The model of different materials joint with bridged interface crack is used to simulate immiscible polymers adhesive bonding. The system of singular integral-differential equations is applied for evaluation of bonds traction for the polymers interface bridged crack. The analysis of the bond traction–separation law parameters influence on the numerical iterative solution convergence of the integral-differential equations system has been performed. Evaluations of the polymer joint fracture toughness were performed using the non-local two-parameter criterion for quasi-static growth of bridged cracks. [Display omitted] •Nonlinear bonds deformation law for bridged crack at immiscible polymers interface are developed.•Adhesion promoter form one and many-stitch bonds between polymers at the crack bridged zones.•Bridged interface crack model is used to simulate immiscible polymer–polymer adhesive bonding.•Singular integral-differential equations are used for numerical analysis of the model.•Criterion of bridged cracks growth is applied to analysis of polymers joint fracture toughness.