Dear Janka,

I suggest you the following papers that match your question.

http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/WoodToughness.pdf

http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/SWFracture.pdf

http://wfs.swst.org/index.php/wfs/article/view/1896

http://link.springer.com/article/10.1007%2FBF00766216

http://download.springer.com/static/pdf/652/art%253A10.1007%252FBF01153088.pdf?originUrl=http%3A%2F%2Flink.springer.com%2Farticle%2F10.1007%2FBF01153088&token2=exp=1457379398~acl=%2Fstatic%2Fpdf%2F652%2Fart%25253A10.1007%25252FBF01153088.pdf%3ForiginUrl%3Dhttp%253A%252F%252Flink.springer.com%252Farticle%252F10.1007%252FBF01153088*~hmac=b973a589b9671460fcaf920a00e307e1c97028cda165bc3d7fe82638d280fdb8

http://link.springer.com/article/10.1007%2Fs10086-002-0467-9

http://download.springer.com/static/pdf/213/art%253A10.1007%252FBF00731031.pdf?originUrl=http%3A%2F%2Flink.springer.com%2Farticle%2F10.1007%2FBF00731031&token2=exp=1457379516~acl=%2Fstatic%2Fpdf%2F213%2Fart%25253A10.1007%25252FBF00731031.pdf%3ForiginUrl%3Dhttp%253A%252F%252Flink.springer.com%252Farticle%252F10.1007%252FBF00731031*~hmac=379c893bee2e36cc33e0133c51f6d76c60052b75dd80a846853605fe4253ad61

http://link.springer.com/article/10.1023%2FA%3A1006703718032

http://www.gruppofrattura.it/ocs/index.php/ICF/ICF6/paper/viewFile/3265/8326

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.549.6246&rep=rep1&type=pdf

http://support.sbcindustry.com/Archive/2008/june/Paper_105.pdf?PHPSESSID=ju29kfh90oviu5o371pv47cgf3

With my best regards

Prof. Bachir ACHOUR

See papers of Stanzl-Tschegg S., Frühmann K., Tan et al., Burgert, etc. in the years 1986 - ca. 2005. If you do not find them let me know. My mail-address: [email protected].

Hello Janka,

you might have a look to the Dissertation of Daniel Keunecke (attached link to this answer). Paper V is dealing with your Topic.

Best regards

Alexander

http://e-collection.library.ethz.ch/eserv/eth:30567/eth-30567-02.pdf