Sigh

While dragging the excitement of April, don't you want to cool down so that you don't die before the hot summer that becomes hot, hot, and rotten in May?
It is plastic deformation as a collection of sounds that share vulnerability destruction and hysterical resolution, but usually it wants destruction with slight elastic destruction, but with the increase of energy, it is a waveform on the crack
with considerable plastic deformation until normal destruction. Since the destruction is completed in a short period of time when the deformation starts as a sound, it is difficult to stop the destruction on the way, and the indicator that shows the resistance to the vulnerability destruction of sound, one of the most terrible forms of destruction, is called destructive toughness in a broad sense.