I understand that the peak load at that specific deformation is to be taken but how do we get the % in degradation (is it by % decrease from one load to another)? Additionally, do we compare peak loads from say 20mm deformation with peak loads from 30mm deformation or do we compared peak loads from 20mm, 1st cycle with degraded loads from the 2nd cycle of the same 20mm deformation. Attached is a visual of the hysteresis loop to show what i meant. Thanks in advance.

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