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    ABSTRACT: Mechanical properties of NiTi shape memory alloy (SMA) were obtained using uniaxial tensile testing and dog-bone specimens. Critical crack tip opening displacement (CTOD) was measured at room temperature on compact tension (CT) specimens using experimental methods of elastic-plastic fracture mechanics (EPFM). To observe the effect of martensitic phase transformation on CTOD, tests were also carried out above martensite deformation temperature (Md). To obtain the displacement and strain fields around the crack tip, under Mode-I loading, digital image correlation (DIC) was used. The extent of transformation zone was calculated using the measured strain field. Finite element analyses were carried out to solve the 2D CT specimen problem under Mode-I loading. Critical CTOD values were calculated for both superelastic and austenitic NiTi for comparison purposes. Size of the transformation zone at the crack tip was also calculated together with crack face opening displacement. The computational and experimental results were compared and discussed. CTOD measurements showed that the phase transformation ahead of the crack tip, improves the fracture behavior of NiTi.
    12/2015; 2:S763-S766. DOI:10.1016/j.matpr.2015.07.394
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    ABSTRACT: The role of awareness in language learning has gained strength with the increasing popularity of cognitive approaches in the field. The Noticing Hypothesis- any form should be noticed in the input and registered consciously to be acquired (Schmidt, 1990, 2001)- contradicts the earlier popular approaches to language acquisition which focus on subconscious processes (Krashen, 1981). The extend that awareness and noticing play a role in language learning is important especially for practitioners to design more effective teaching courses and programs. The implications of related studies will also be determinant of teacher and learner roles in the learning process. Therefore, this paper presents a review of the related studies on ‘noticing’ and discusses the important concepts of the Noticing Hypothesis. With the purpose of detecting and refuting the contradictory arguments in these studies and clarifying the conceptual issues, the paper adopts a critical perspective. Highly polarized view of the involvement of either conscious or unconscious processes in learning is in the centre of discussion in the paper. One of the main conclusions of the study is that such a dismissive tone may impede a more comprehensive perspective on the subject and may lead the practitioners to adopt absolute approaches to language learning.
    Procedia - Social and Behavioral Sciences 08/2015; 199:261-267. DOI:10.1016/j.sbspro.2015.07.515
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    İstanbul, Turkey
  • Head of Institution
    Prof. Gulay Barbarosoglu
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Top publications last week by reads

The American Journal of Human Genetics 08/2007; 81(1):158-64. DOI:10.1086/518770
210 Reads
ELT Journal 04/1993; 47(2):136-143. DOI:10.1093/elt/47.2.136
94 Reads

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