Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/134936
Title: WEIBULL ASSESSMENT OF CLEAVAGE FRACTURE FOR STEELS UNDER MIXED-MODE I AND II LOADING
Authors: ZHANG ZEFENG
Keywords: mixed-mode, ductile-to-brittle transition, cleavage fracture, Weibull stress, cleavage initiation angles, sample size
Issue Date: 12-Aug-2016
Source: ZHANG ZEFENG (2016-08-12). WEIBULL ASSESSMENT OF CLEAVAGE FRACTURE FOR STEELS UNDER MIXED-MODE I AND II LOADING. ScholarBank@NUS Repository.
Abstract: The increasing usage of high-strength steels in structural applications drives the development of quantitative cleavage fracture assessment for critical engineering materials. The observed large scatter in the experimentally measured fracture toughness values creates significant challenges in assessing the brittle structural failure through a conventional, deterministic approach often utilized to assess ductile fracture failure. The Weibull stress model has become widely acknowledged to characterize the statistical scatter of fracture toughness under pure mode I conditions. This study extends the Weibull stress framework into the mixed-mode I and II ductile-to-brittle transition (DBT) fracture. The present work investigates a universally acceptable stress-based failure criterion under the mixed-mode I and II loadings, and incorporates the ductile tearing effect into the extended Weibull stress framework. This study also encompasses an extensive experimental program for the high-strength steel material S550 under four-point bend and shear, mixed-mode I and II conditions.
URI: http://scholarbank.nus.edu.sg/handle/10635/134936
Appears in Collections:Ph.D Theses (Open)

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