Mechanical Simulation of Thermoplastic Composite Fiber Variable-Angle Laminates

Area of Science:

• Materials Science
• Mechanical Engineering
• Composite Materials

Background:

• Variable-stiffness laminates offer tailored mechanical properties by controlling fiber orientation.
• Optimizing fiber placement is crucial for enhancing laminate performance under various loads.
• Understanding the relationship between fiber path parameters and laminate behavior is essential for design.

Purpose of the Study:

• To investigate the influence of the connection point parameter (β) on the static mechanical properties of thermoplastic fiber variable-angle laminates.
• To analyze stress and deformation patterns in variable-stiffness laminates under compressive load.
• To establish a finite element analysis model for variable-stiffness laminates using Bezier curves.

Main Methods:

• Finite element analysis (FEA) model development for variable-stiffness laminates.
• Bezier curve method for defining fiber placement reference paths.
• Parametric study analyzing the effect of the connection point parameter (β) on stress and deformation.

Main Results:

• Maximum stress increases then decreases with β, peaking at β=0.5; minimum stress follows a similar trend, reaching minimum at β=0.3.
• Maximum deformation increases then decreases with β, peaking at β=0.8; minimum deformation decreases then increases, reaching minimum at β=0.6.
• Deformation distribution is symmetrical, decreasing from ends to the middle, with the maximum deformation area changing from rectangular to elliptical.

Conclusions:

• The connection point parameter (β) significantly impacts the static performance of variable-stiffness laminates.
• Optimal β values exist for minimizing stress and deformation, allowing for tailored mechanical properties.
• FEA provides a robust method for predicting and optimizing the behavior of complex composite structures.