An Anisotropic Damage-Plasticity Constitutive Model of Continuous Fiber-Reinforced Polymers

Area of Science:

• Materials Science
• Mechanical Engineering
• Computational Mechanics

Background:

• Accurate structural analysis of continuous fiber-reinforced polymers (FRPs) is crucial for engineering.
• Existing models struggle with the nonlinear behavior of FRPs due to damage and plasticity.
• There is a need for efficient and practical constitutive models for FRPs.

Purpose of the Study:

• To develop an innovative anisotropic constitutive model for FRPs.
• To accurately capture both damage evolution and plasticity in FRPs.
• To provide a practical model with easily obtainable parameters from mechanical tests.

Main Methods:

• Utilized the three-dimensional Puck criteria for damage determination.
• Employed continuum damage mechanics and linear stiffness attenuation for damage evolution.
• Integrated a one-parameter plastic model and implemented it in ANSYS using Cauchy stress and consistent tangent stiffness.

Main Results:

• The developed anisotropic constitutive model successfully simulates damage and plasticity in FRPs.
• Numerical simulations showed remarkable correspondence with experimental data from biaxial and open-hole tension tests.
• The model's effectiveness was validated on carbon and glass FRP laminates.

Conclusions:

• The proposed anisotropic constitutive model accurately predicts the behavior of FRPs.
• The model's practical implementation and validation confirm its reliability for engineering applications.
• This work advances the constitutive modeling of composite materials, particularly FRPs.