T-PEEL TEARING OF A MODEL BLACK-FILLED NATURAL RUBBER TREAD PLY VULCANIZATE

摘要

T-peel tearing of a model black-filled natural rubber tread ply vulcanizate has been carried out. Tearing alternates between slow ("stick") and fast growth stages ("slip"). "Stick" fracture involves sideways cracking into the loading direction. This blunts the peel front, slows forward tearing, and results in rough fracture surfaces. "Slip" fracture is the sudden forward growth of a crack, leaving relatively smooth fracture surfaces. "Stick-slip" fracture is characteristic of highly reinforced rubbers; it is also seen in edge-cut tensile specimens and trouser tear specimens of black-filled NR.