New Numerical Method Based on Linear Damage Evolution Law for Predicting Mechanical Properties of TiB₂/6061Al.

Area of Science:

• Materials Science
• Mechanical Engineering
• Composite Materials

Background:

• Titanium diboride (TiB2) particles are used to reinforce 6061 aluminum (Al) metal matrix composites.
• Understanding the mechanical properties of these composites is crucial for their application.

Purpose of the Study:

• To investigate the effect of TiB2 particle content and clustering on the mechanical properties of TiB2/6061Al composites.
• To establish a predictive model for composite behavior.

Main Methods:

• Established 3D representative volume elements (RVEs) of TiB2/6061Al composites based on SEM images.
• Incorporated ductile matrix damage and interface behavior with linear damage evolution.
• Performed RVE tensile experiments using mixed boundary conditions.

Main Results:

• Increased TiB2 content (2.5% to 12.5% by weight) improved elastic modulus, yield strength, and tensile strength by 8%, 10.37%, and 11.55%, respectively.
• Elongation decreased by 10% with increased TiB2 content.
• Higher TiB2 particle clustering (20% to 80%) did not improve load-bearing capacity and reduced elongation by 8%.

Conclusions:

• TiB2 particles enhance load-bearing capacity but reduce ductility in 6061Al composites.
• Particle clustering significantly affects toughness and elongation, with higher clustering leading to reduced elongation.
• Particle spacing is critical for managing stress fields and crack propagation.