id	keyword
fis-2418	crack
fis-2418	reliability
fis-2418	shape
fis-2418	index
fis-2418	factor
fis-2418	doi
fis-2418	point
fis-2418	fatigue
fis-2418	pipeline
fis-2418	surface
fis-2418	depth
fis-2418	ratio
fis-2418	stress
fis-2418	growth