Effects of Elastic Couplings in a Compressed Plate Element with Cut-Out

Area of Science:

• Materials Science
• Composite Materials Engineering
• Structural Mechanics

Background:

• Asymmetric composite laminates exhibit complex coupling behaviors.
• Understanding these couplings is crucial for designing advanced composite structures.
• Classical Laminate Theory (CLT) provides a framework for analyzing laminate mechanics.

Purpose of the Study:

• To investigate the elastic couplings in asymmetric carbon fiber-reinforced polymer (CFRP) laminates.
• To analyze the influence of ply orientation on extension-twisting and extension-bending couplings.
• To determine the optimal fiber angles for amplifying elastic coupling effects.

Main Methods:

• Analytical calculations based on Classical Laminate Theory (CLT).
• Utilized MATLAB software to compute matrix components (A, B, D) and coefficients (Dc, Bt).
• Examined the effect of ply orientation and layer angle on elastic coupling parameters.

Main Results:

• Extension-twisting and extension-bending couplings are highly dependent on laminate ply orientation.
• The coefficients Bt and Dc are significantly influenced by the fiber layer angles.
• Fiber laying angles between 45-50° were found to substantially amplify elastic coupling effects.

Conclusions:

• Ply orientation is a critical design parameter for controlling elastic couplings in asymmetric CFRP laminates.
• Specific fiber angles, particularly around 45-50°, can be leveraged to enhance desired coupling behaviors.
• The findings provide valuable insights for tailoring the mechanical response of CFRP composites for specific applications.