Experimental Verification and Comparative Analysis of Equivalent Methods on Metal's Fixed Joint Interface

Area of Science:

• Mechanical Engineering
• Structural Dynamics
• Computational Mechanics

Background:

• Accurate modeling of fixed metal joint interfaces is essential for predicting and enhancing structural dynamic characteristics.
• Existing equivalent modeling methods may not fully capture the complex behavior of these interfaces.

Purpose of the Study:

• To evaluate and compare three distinct equivalent modeling methods for fixed metal joint interfaces: virtual material, spring damping, and finite element methods.
• To determine the most accurate method for simulating the dynamic behavior of metal joint interfaces through experimental validation.

Main Methods:

• Developed contact mechanics models for fixed metal joint interfaces.
• Assigned physical properties to 3D models in ANSYS software.
• Performed modal analysis using virtual material, spring damping, and finite element methods.
• Validated simulation results against experimental modal analysis data.

Main Results:

• All three theoretical methods produced modal shapes consistent with experimental results.
• The virtual material method yielded the closest natural frequencies to experimental data, with errors under 10%.
• The spring damping and finite element methods showed higher errors, ranging from 9% to 39%.

Conclusions:

• The virtual material method is identified as a superior equivalent modeling technique for fixed metal joint interfaces.
• This method offers improved accuracy in predicting natural frequencies compared to spring damping and finite element methods.
• Accurate modeling is key to enhancing the dynamic performance of structures with fixed metal joints.