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Hello, I just started using OpenSees for my Ph.D thesis. For considered the degradation under cyclic loading, I use PINCHING4 Material. The cyclic degradation is defined by four parameters (for example: $gK1 $gK2 $gK3 $gK4 $gKLim). My question is: what is the difference between K1, K2, K3, K4, Klim?...

Hello, I just started using OpenSees for my Ph.D thesis. For considered the degradation under cyclic loading, I use PINCHING4 Material. The cyclic degradation is defined by four parameters (for example: $gK1 $gK2 $gK3 $gK4 $gKLim). My question is: what is the difference between K1, K2, K3, K4, Klim?...