Failure-Mode Shift of Metal/Composite L-Joint with Grooved Structure under Compressive Load

Area of Science:

• Materials Science
• Mechanical Engineering
• Composite Materials

Background:

• Bond length and interface morphology significantly impact metal/composite hybrid joint performance.
• L-shaped joints are critical in various structural applications, demanding optimized design for strength and durability.

Purpose of the Study:

• To investigate the effect of varying bonding lengths on the compressive performance of metal/composite L-joints.
• To develop and validate a simulation method for predicting joint behavior under compression.
• To identify the optimal bonding length for enhanced joint properties.

Main Methods:

• Fabrication of seven metal/composite L-joints with different bonding lengths using the Vacuum Assisted Resin Infusion (VARI) process.
• Development of a simulation model employing the stiffness equivalence method, treating the groove structure as a zero-thickness layer.
• Experimental validation of the simulation method by comparing ultimate load, displacement, and failure modes.

Main Results:

• The simulation method accurately predicted the ultimate load, displacement, and failure modes of the metal/composite L-joints.
• Prediction diagrams for failure displacement and mode were generated for various bonding lengths.
• Optimal compressive properties were observed at a bonding length of 100.00 mm.

Conclusions:

• The stiffness equivalence method is a valid approach for simulating metal/composite L-joints with groove structures.
• Bonding length is a critical design parameter influencing the compressive performance of these hybrid joints.
• A bonding length of 100.00 mm is recommended for achieving superior compressive properties in the studied metal/composite L-joints.