Dual Graded Lattice Structures: Generation Framework and Mechanical Properties Characterization

Area of Science:

• Materials Science
• Mechanical Engineering
• Additive Manufacturing

Background:

• Additive manufacturing (AM) allows for complex part geometries with tailored properties.
• Lattice structures, formed by repeating unit cells, optimize mechanical and thermal performance.
• Functionally graded lattice structures enable domain-specific property optimization.

Purpose of the Study:

• To introduce a dual graded lattice structure (DGLS) generation framework.
• To investigate the impact of dual grading on mechanical properties.
• To demonstrate the framework's efficiency using benchmark parts.

Main Methods:

• Developed a framework for simultaneous grading of unit cell size and relative density/porosity.
• Applied the framework to standard and custom unit cells based on spatial coordinates.
• Tested the framework on benchmark parts with various unit cells and grading equations.

Main Results:

• The DGLS framework efficiently grades lattice structures.
• Dual grading of size and density significantly impacts mechanical properties.
• Compressive strength, elastic modulus, absorbed energy, and fracture behavior are fine-tuned.

Conclusions:

• The DGLS generation framework offers a method for advanced part optimization.
• Simultaneous grading of lattice size and density enhances control over mechanical performance.
• This approach holds potential for optimizing diverse AM applications.