1 Erratum to: Materials and Structures DOI 10.1617/s11527-006-9214-9

Due to an unfortunate turn of events this article is published on the preceding pages with an erroneous version of Equation 14. Please find below the correct Equation 14 that should be regarded by the reader as the final version.

$$ f_{{k1,k}} = 4.0\quad {\text{if}} \ {\ell}_{{ad}} \le 250\;{\text{mm}} $$
(14)