id	keyword
fis-2901	gradient
fis-2901	strain
fis-2901	tip
fis-2901	plasticity
fis-2901	crack
fis-2901	stress
fis-2901	material
fis-2901	crack tip
fis-2901	dislocations
fis-2901	strain gradient
fis-2901	density
fis-2901	theory