Bio-inspired composites with functionally graded platelets exhibit enhanced stiffness

Area of Science:

• Materials Science
• Mechanical Engineering
• Bio-inspired Engineering

Background:

• Unidirectional composites, mimicking natural structures like nacre, feature stiff platelets in a soft matrix, offering excellent mechanical properties.
• Functionally graded composites represent an advancement, with spatially varying properties for enhanced thermo-mechanical performance.

Purpose of the Study:

• To investigate the mechanical properties of bio-inspired unidirectional composites with functionally graded platelets.
• To analytically determine the stiffness of these composites using tension shear chain and complementary energy models.
• To evaluate the impact of geometric parameters and gradation on overall composite properties.

Main Methods:

• Development of analytical models: tension shear chain model and minimization of complementary energy model.
• Parametric study on overlapping length, gradation parameters, and platelet aspect ratio.
• Validation of analytical solutions using finite element analysis.

Main Results:

• Functionally graded platelets can significantly enhance composite stiffness, with potential increases up to [Formula: see text].
• Specific parameter values were identified for optimal stiffness enhancement.
• Analytical models accurately predicted composite behavior, validated by finite element analysis.

Conclusions:

• Bio-inspired composites with functionally graded platelets offer superior stiffness compared to traditional designs.
• These engineered composites are suitable for demanding structural applications in industries like automotive and aerospace.
• The study provides a framework for designing high-performance composites with tailored properties.