Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/34341
Title: Cleavage fracture assessment incorporating strain gradient plasticity
Authors: ZHANG SUFEN
Keywords: cleavage fracture, CMSG plasticity, Weibull stress, material length scale
Issue Date: 20-Dec-2011
Source: ZHANG SUFEN (2011-12-20). Cleavage fracture assessment incorporating strain gradient plasticity. ScholarBank@NUS Repository.
Abstract: This thesis investigates the cleavage fracture of structural steels through the re-calibration of Weibull stress parameters based on the CMSG plasticity theory, and shows that the CMSG plasticity could strongly raise the magnitudes of Weibull stresses compared with those computed from the classical plasticity, while both constitutive models provide the similar Weibull stress parameters (Weibull modulus m and the threshold fracture toughness Kmin). This thesis also quantifies the material length scale of the structural steels by the indentation tests. With the obtained material length scale, this thesis further shows that the CMSG plasticity theory could provides drastically different estimation of the near-tip crack opening displacement, implying the plastic strain gradient hardens the material and limits the plastic deformation near the crack tip.
URI: http://scholarbank.nus.edu.sg/handle/10635/34341
Appears in Collections:Ph.D Theses (Open)

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