If you work on contact mechanics, or have difficulty get your FEA model converge due to contact, you may find it beneficial reading my patent on "Contact stiffness estimation based on structural frequency response". It forms a first ever rational method to estimate the contact stiffness, and provides a practical technical solution to a real challenge in contact mechanics. For industrial FEA developers or users, please contact me for the right to commercialize or implement it. Thank you!
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