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Effects of weak bond between inclusion boundary and wire matrix on wire breakage in inclusion wire drawing
(2020-01-01)
Norasethasopon, Somchai
This investigation shows how the weak bond between inclusion boundary and wire matrix affected stress distribution, maximum tensile stress, drawing stress and wire breakage in inclusion copper wire drawing by 2D FEM. Necking was found on the copper wire surface at the wire portion which contained the inclusion. The maximum tensile stress and the minimum drawing stress of inclusion copper wire drawing were obtained. It was seen that the inclusion size and the weak bond between inclusion boundary and wire matrix strongly affected tensile stress, drawing stress and wire breakage.
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Quality, equity, inclusion and lifelong learning in pre-service teacher education
(2019-12-01)
Sunthonkanokpong, Wisuit
;
Murphy, Elizabeth
Sustainable Development Goal 4 (SDG 4) focuses on ensuring inclusive and equitable, quality education and lifelong learning opportunities for all. One of the three means of implementation of SDG 4 targets is SDG 4c which calls on countries and donors to significantly increase the supply of qualified teachers in developing and underdeveloped countries. This emphasis on the supply of teachers is in recognition of the fact that the quality of education ultimately depends on teachers. In general, there is widespread agreement that teacher education has an important role to play in the achievement of the SDG 4 targets. However, there has been limited attention in the literature to SDG 4 in a context of teacher education. This paper aims to contribute to the literature on SDG 4 and teacher education. The paper first presents a conceptual framework pertaining to quality, equity, inclusion, and lifelong learning. Next, the framework is applied to the case of Thailand to identify examples of progress the country is making in support of realization of SDG 4 in teacher education. The framework with the four concepts can be applied by researchers to identify examples of progress on SDG 4 in teacher education in other countries and contexts.
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The role of engineering education for innovation in the 21st century
(2019-01-01)
Sunthonkanokpong, Wisuit
;
Murphy, Elizabeth
This conceptual paper first presents a synthesis of the central target and related concepts of five innovation policies from Asia. The paper then identifies how engineering education (EE) can help realise this target. Methods involved online, quantitative, key concept analysis combined with qualitative analysis of units of meaning. Analysis of the policies revealed that the overall target was social and economic prosperity. The prosperity is powered by a capacity for sustainability and inclusivity and by five other sub-categories of capacity as follows: human; relational; research and development; science, technology and innovation and; entrepreneurship and competitive. EE can contribute to social and economic prosperity by helping to build this capacity. Building capacity requires a shift from teaching as telling, to teaching as doing, from transmission of knowledge, to construction of knowledge, from teacher- to learner-centred learning and from didactic teaching to project- and problem-based learning situated in authentic, scientific, social and technological contexts.
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Finite-element simulation of inclusion size effects on copper shaped-wire drawing
(2006-04-25)
Norasethasopon, S.
;
Yoshida, K.
The effects of inclusion size on copper shaped-wire drawing were investigated. For this purpose, an experimental investigation for optimal die half-angle was conducted. Based on experimental data of optimal die half-angle, the deformation and the hydrostatic stress of the copper shaped-wire that contain an inclusion were calculated by two-dimensional finite element analysis. As the FEA results, while the leading edge of the inclusion passed through the die, the necking due to inclusion wire drawing occurred on some parts of the copper wire surface in front of and near the leading edge of the inclusion. The effects of inclusion size on drawing stress, tensile stress in front of inclusion and contact compressive stress while copper shaped-wire drawing were carried out. © 2006 Elsevier B.V. All rights reserved.
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Influence of flaws of wire rod surface, inclusions and voids on wire breaks in superfine wire drawing
(2003-07-01)
Yoshida, Kazunari
;
Norasethasopon, Somchai
;
Shinohara, Tetsuo
;
Ido, Ryuta
By means of the finite element analysis (FEA), this study analyzed wire breaks that occurred in the drawing fine wires containing flaws on the wire surface, inclusion and void. The deformation behavior of an inclusion was examined, in which the inclusion's location is assumed to be on the center axis of the wire, and the cause of wire breaks and their prevention method were clarified. It was found that an inclusion diameter/wire diameter ratio of 0.4 or higher increases the likelihood of wire breaks occurring. When the inclusion is not assumed to be in the center axis of the wire, it was also found that necking and wire breaks appear more frequently. FEA showed that a flaw grows with each processing step, when a small circumferential flaw is placed on the wire rod surface, and eventually becomes a surface defect, which is called a check mark in practice.
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