Benchmark "rad" : Linear Elasticity in r-z-coordinates (3D - rotational symmetric domain)

Material coefficients:	E	nu
	200000.	0.3
volume force :	f
	(1,0)	(centrifugal)
Boundary conditions:	possibly:	u_r(r=0,z)=0
homogenous Neumann - type:	overall

Typical behavior of estimated relative error:
(Das typische Verhalten des geschaetzten Fehlers) (Legend)

here some RUNs with times / iteration numbers / etc. ohne Dir.-Rb.

Typical behavior of estimated relative error (with add. Dir.-type b.c.'s):
Das typische Verhalten des geschaetzten Fehlers (mit Dir.Rb.): (Legende)

here some RUNs with times / iteration numbers / etc. , (with b.c.: u_r(0,z)=0)