Microscopic progressive damage simulation of unidirectional composite based on the elastic–plastic theory

Abstract

Computational mechanics has been carried out to study the microscopic failure mechanisms of unidirectional fiberreinforced polymer composites. A representative volume element of fiber random distribution based on molecules random collision model is established, with two dominant damage mechanisms, matrix plastic deformation and interfacial debonding included in the simulation by the extended Drucker-Prager model and cohesive zone model, respectively. The simulation results clearly reveal the damage process of the composites and the interactions of different damage mechanisms. It can be concluded that the transverse tension fracture initiates as interfacial debonding and evolves as a result of interactions between interfacial debonding and matrix plastic deformation, while the compression failure is dominated by matrix plastic damage. The longitudinal tension and compression are both dominated by fiber breakage, but longitudinal tension initiates as matrix plastic damage and longitudinal compression initiates as fiber microbuckling. Finite element method appropriately simulated the process of progressive damage of the fiber buckling failure, which is consistent with the observed result under scanning electron microscopy.

Research on the shear failure load of composite pretightened tooth connections by the characteristic lengths

“…a n ¼ ÀC n cos n n 4 þ2n 2 þp 2 , E 1 is elasticity modulus along the fiber direction, E 2 is elasticity modulus perpendicular to fiber direction, G is the shear elasticity modulus along the fiber direction, 12 is the Poisson's ratio, h 1 is the tooth depth, H is the composite laminate depth, h ¼ H À 2h 1 .…”

A micromechanics based elasto-plastic damage model for unidirectional composites under off-axis tensile loads

“…J2 flow rule, was applied for matrix elasto-plasticity and a cohesive element method is employed to simulate interface debonding. Examples can be found in the work of Melro et al 20 , Han et al 21 , and Pulungan et al 22 However, such models has to be implemented in a finite element model where no explicit expressions are provided. In addition, the computational cost of a cohesive element method is high as reported 13,23,24 .…”

“…is a bridging matrix for a global two-phase composite, whose expressions are given in Eqs (21)(22)(23)(24)(25)…”

Multiscale Collaborative Optimization of Processing Parameters for Carbon Fiber/Epoxy Laminates Fabricated by High-Speed Automated Fiber Placement

“…and are closely associated with 1 and 2 . Equation (12) shows that processing parameters could cause the internal stress of the composite to change and then lead to the formation of damage. ALLSE and SED are physical quantities which could evaluate intensity and distribution of stress.…”

“…However, the multiscale material damage still remains a compelling challenge until now [6][7][8][9][10]. Although much research has been done on the defects of composites during service life [11][12][13], little work has been done on the evolution mechanism of multiscale defects in AFP process.…”