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4. Version WU WEI

This version was propesed in [5].

$\begin{eqnarray*}\kTb=C_1(\tr\Tb)\Db+C_2\Frac{\tr(\Tb\Db)}{\tr\Tb}\Tb+C_3 \Frac{... ...\tr\Db^2}+C_4\Frac{{\Tb^{\ast}}^2}{\tr\Tb}\sqrt{\tr \Db^2}\quad. \end{eqnarray*}$

with

$\begin{eqnarray*}{\Tb^{\ast}}^2 := \Tb - \frac{1}{3}(\tr \Tb) \Ib \end{eqnarray*}$

The parameters for Karlsruhe sand are:

Density	C₁	C₂	C₃	C₄	reference
loose	-33,3	-308,4	-306,8	321,3	[5]
dense (e₀ = 0,55)	-110,15	-963,73	-877,19	1226,2	[1]
loose (e₀ = 0,76)	-69,23	-670,72	-653,26	690,9	[1]

Wolfgang Fellin
1999-10-01