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- W2024992707 abstract "Abstract A new theory by Khantha, Pope and Vitek (KPV) and Khantha, which attributes sharp brittle-to-ductile transitions (BDT) of the type observed in silicon to a cooperative Kosterlitz-Thouless instability for dislocation generation, is examined critically. Results of simulations relevant to the KPV model show that contrary to the claim made by Khantha et al. , the KPV theory does not predict a strain-rate dependent temperature T c for the sharp transition. Instead, it predicts a strain-rate independent sharp transition, or, in the quasi-brittle regime, a strain-rate dependent gradual transition. The new theory in its present form therefore does not explain the experimentally observed, strain-rate dependent, sharp transitions in silicon. Evidence from experiments and simulations is presented that this transition is essentially due to the non-homogeneous emission of dislocations from the crack tip. Emission starts at certain points along the crack tip, generating a strongly shielding plastic zone, which traverses the whole length of the crack tip at T c before the stress reaches that for brittle fracture. For a given strain-rate T c is therefore controlled by dislocation velocity and a length which depends on the original source distribution. This model, unlike KPV, predicts correctly the strain-rate dependence of the sharp transition, and explains the fact that it is structure sensitive." @default.
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- W2024992707 date "1996-06-01" @default.
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- W2024992707 title "Comment on the brittle-to-ductile transition: A cooperative dislocation generation instability; dislocation dynamics and the strain-rate dependence of the transition temperature" @default.
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- W2024992707 doi "https://doi.org/10.1016/1359-6454(95)00363-0" @default.
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