Two types of tear curves are obtained for various vulcanizates (see Fig. 4 of D 624). For Curve (b), smooth tear the tearing,, Load fluctuates only slightly and the rate of tear propagation is essentially continuous and roughly equal to one-half that. Of jaw separation. Curve (a) is typical of knotty tear consisting of, a series of, peak loads each corresponding to a catastrophic. Tear. This behavior is the result of a strengthening structure or strain energy dissipation process in the immediate tearing. Zone. The mechanism consists of a build-up of stress in the tearing zone with a concurrent strengthening structure, formation. This retards onset of rupture. As stress continues to increase tear strength, is exceeded at some point and a catastrophic. Rupture occurs. Tear propagation after this rupture is quite rapid and the tear continues to advance until the high stress. Gradient is removed; the tear rate then drops to zero. The jaws continue, to separate however and the, process repeats several. Times during a test.
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