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For non composite material, the ideal way to check the change in mass is once the optimization is over is do an OSS smooth on the model and check the mass in HM through Tool-->mass calc and select all the elements.
Composite optimization should be done in three phase using OptiStruct.You can refer to below online tutorial.
OS-T: 3200 Design of a Composite Aircraft Underbelly Fairing
Refer webinar on composite optimization as keyword in Altair University Learning library.
https://altairuniversity.com/learning-library/
For non composite material, the ideal way to check the change in mass is once the optimization is over is do an OSS smooth on the model and check the mass in HM through Tool-->mass calc and select all the elements.