Is your feature request related to a problem? Please describe.
Make the properties f_u_thick&thin, f_y_thick/thin abstract again
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Is your feature request related to a problem? Please describe.
Make the properties f_u_thick&thin, f_y_thick/thin abstract again
Describe the solution you'd like
A clear and concise description of what you want to happen.
Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.
Additional context
Add any other context or screenshots about the feature request here.