Crack propagation behavior in rubber materials |
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Authors: | Thomas Horst G Heinrich |
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Institution: | 1. Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Stra?e 6, D-01069, Dresden, Germany
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Abstract: | Within the linear viscoelastic theory, crack tip fields are calculated at various crack tip velocities. A transition from
rubbery to glassy material behavior in the vicinity of the crack tip can be observed. Shear and bulk behavior is analyzed
separately. Whereas the increase of tearing energy at higher crack tip velocities can be ascribed to the shear behavior, bulk
behavior influences the fracture mechanism. The results support experimental investigations that the instability separating
stable from unstable crack propagation is related to a change in the fracture mechanism. At low crack tip velocities, material
separation is the result of formation, growth, and coalescence of cavities. At high crack tip velocities, cavitation is suppressed
and fracture is driven by a rather brittle mechanism resulting in a decreased amount of energy to propagate the fracture process
zone.
Published in Russian in Vysokomolekulyarnye Soedineniya, Ser. A, 2008, Vol. 50, No. 5, pp. 882–891.
This article was submitted by the authors in English. |
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