CRACK RESISTANCE EVALUATION FOR Al+3.5% Mg ALLOYS BY MEASURMENTS OF ULTRASONIC VELOCITIES AND HARDNESS
The crack resistance in fracture mechanics is defined as critical value of stress intensity factor in the plane-strain fracture toughness. A mechanical test is used to assess it under certain conditions. This is a complicated, long and expensive procedure. In practice, it is of interest to determine the crack resistance for construction elements by means non-destructive evaluations (NDE).