id	keyword
fis-2518	concrete
fis-2518	crack
fis-2518	notch
fis-2518	doi
fis-2518	curve
fis-2518	propagation
fis-2518	length
fis-2518	fracture
fis-2518	specimens
fis-2518	load
fis-2518	materials
fis-2518	toughness