Assertion: rubber | /r/CapableOf | become difficult to stretch
Facets:
value: progressively
type: MANNER
Source sentences:
text: For rubber-like materials such as elastomers, the slope of the stress–strain curve increases with stress, meaning that rubbers progressively become more difficult to stretch, while for most metals, the gradient decreases at very high stresses, meaning that they progressively become easier to stretch.