Fig. 9: Crack initiation and final failure
Right before crack initiation, marked with a , a last high-intensity pulse runs through the hole (here, pulse 28). Final break is marked with the symbol  in the load/displacement curve. At crack onset the heat increase at both sides of the hole is clearly detectable with a maximum temperature difference of \(T=17.1\)K. Also, for final break, the crack tip running through the specimen is well-defined as a local temperature increase. The maximum temperature difference can be measured to be \(T=36.47\)K.