id	keyword
fis-1840	mode
fis-1840	specimen
fis-1840	fracture
fis-1840	ccnbd
fis-1840	toughness
fis-1840	crack
fis-1840	rock
fis-1840	loading
fis-1840	fig
fis-1840	fracture toughness
fis-1840	chevron