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Table 2 The stiffness fitting function and parameters

From: Modelling and Dynamic Characteristics for a Non-metal Pressurized Reservoir with Variable Volume

Parameters Value
K1(N/mm) f(x)=a1x4+a2x3+a3x2+a4x+a5
a1(N/mm5) 2.401×10−7
a2(N/mm4) 4.105×10−5
a3(N/mm3) − 0.006157
a4(N/mm2) 0.2066
a5(N/mm) − 5.315