![]() The velocity and crack-tip features of fast-moving cracks are discussed in relation to the nonlinear elasticity and viscoelasticity of bulk elastomers. ![]() 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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