The crack-tip features, including the crack-tip profiles and the local crack-tip strain BookID _ChapID _Proof# 1-9/11/21 fields, are revealed for a quasi-stationary crack and fast-moving cracks ranging from subsonic to super-shear (intersonic) cracks. This article described in summarized form our recent experimental investigations on fast crack growth in elastomers. Understanding the crack growth mechanism is important for toughening elastomers. The characteristics of the crack-tip strain field are also significantly influenced by the SIC-driven hardening: The crack-tip opening displacement increases with increasing λ at λ λ*.Ĭrack growth often leads to catastrophic failure of rubber products. Further stretch beyond λ* (>λs) causes SIC-driven hardening, resulting in a pronounced increase in V. The steady-state crack velocity (V) increases with increasing λ, and V exceeds the shear wave speed of sound at λ > λs. We investigate the Mode-I fast crack growth in the IR sheets as a function of λ in a pure shear geometry. Cis-1,4-Polyisoprene (IR) elastomers harden via strain-induced crystallization (SIC) when the imposed stretch (λ) exceeds the onset value of SIC (λ*).
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