Rigid inclusions cavitation near

FIGURE 10.11 Critical applied stress, Oc, for cavitation near rigid inclusions (see Figure 10.10) versus Young s modulus, E, of the elastomer. (From Oberth and Bruenner (1965).)... 

The critical stress predicted by Eq. (14) depends only on the elastic modulus and not at all on the strength of the elastomer. In agreement with this, cavitation stresses in bonded rubber blocks under tension (Figs. 8 and 9) [35], and near rigid inclusions, at points where a triaxial tension is set up (Figs. 

FIGURE 10.10 Cavitation near a rigid inclusion (schematic). 

Cavitation near small rigid inclusions is more difficult to induce (Gent and Park, 1984), probably because the volume of rubber subjected to a critical triaxial tension is too small to contain relatively large precursor voids. And larger stresses are necessary to expand small voids less than about 0.5 p,m in diameter. 

---