1. Dept. of Solid Mechanics, KTH Royal Inst. of Technology, Stockholm, SE-10044, Sweden
2. 3SR Lab., Grenoble-Alpes University, Grenoble, F-38041, France
3. Atlas Copco Rock Drills AB, Örebro, SE-70225, Sweden
4. Dept. of Solid Mechanics, KTH Royal Inst. of Technology, Stockholm, SE-10044, Sweden, (Corresponding author), e-mail: pelle@hallf.kth.se
5. LMT Cachan, ENS Cachan, CNRS, University of Paris-Saclay, Cachan Cedex, F-94235, France