Equivalent Method of Joint Interface Based on Persson Contact Theory: Virtual Material Method

Area of Science:

• Mechanical Engineering
• Materials Science
• Computational Mechanics

Background:

• Accurate modeling of metal joint interfaces is crucial for optimizing overall machine dynamic performance.
• The virtual material method offers a precise approach to simulating joint interface behavior.
• Traditional methods often rely on the M-B fractal contact theory.

Purpose of the Study:

• To develop and validate a more accurate equivalent method for metal joint interfaces.
• To compare the effectiveness of Persson contact theory against M-B fractal theory in virtual material modeling.
• To improve the prediction of natural frequencies for joint interfaces.

Main Methods:

• Established an interface contact mechanics model using Persson contact theory.
• Determined the physical properties (elastic modulus, Poisson's ratio, density) of virtual materials.
• Applied virtual material methods based on both Persson and M-B fractal theories to modal simulations.
• Validated simulation results against modal experimental data.

Main Results:

• Virtual material method based on Persson contact theory yielded natural frequencies with <5% error compared to experiments.
• Virtual material method based on M-B fractal contact theory showed <10% error.
• Persson contact theory demonstrated superior accuracy in predicting joint interface natural frequencies.

Conclusions:

• Persson contact theory provides a more accurate equivalent method for metal joint interfaces compared to the M-B fractal contact theory.
• The enhanced virtual material method significantly improves the prediction of dynamic performance for mechanical systems.
• This research offers a validated approach for precise joint interface modeling in engineering applications.