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Godwin Kwame Ahiale,오용준,Won-Doo Choi,Kwang-Bok Lee,Jae-Gyu Jung,Soo Woo Nam 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.5
This study presents the microstructure and high cycle fatigue performance of lap shear joints of dual phase steel (DP590) welded using gas metal arc welding (GMAW) and plasma arc welding (PAW) processes. High cycle fatigue tests were conducted on single and double lap joints under a load ratio of 0.1 and a frequency of 20 Hz. In order to establish a basis for comparison, both weldments were fabricated to have the same weld depth in the plate thickness. The PAW specimens exhibited a higher fatigue life, a gentle S-N slope, and a higher fatigue limit than the GMAW specimens. The improvement in the fatigue life of the PAW specimens was primarily attributed to the geometry effect that exhibited lower and wider beads resulting in a lower stress concentration at the weld toe where cracks initiate and propagate. Furthermore,the microstructural constituents in the heat-affected zone (HAZ) of the PAW specimens contributed to the improvement. The higher volume fraction of acicular ferrite in the HAZ beneath the weld toe enhanced the PAW specimen’s resistance to fatigue crack growth. The double lap joints displayed a higher fatigue life than the single lap joints without changing the S-N slope.
Image Re-branding in a Fragile State: The Case of Nigeria
Godwin Uyi Ojo,Iro Aghedo 서울대학교행정대학원 2013 Journal of Policy Studies Vol.28 No.2
In today’s globalized world, nations are increasingly concerned about how they are perceived by their publics, often carefully planning and executing policies to maintain a positive identity or shed a negative image. While some countries are able to execute nation branding, others are not. Using the Nigerian experience as a case study, this article shows how the character of a state can undermine its capacity for successful nation branding. We argue that countries are judged not just by what they say but also by what they do, and that inherent contradictions such as sectarian violence, ethnic tension, and corruption underline Nigeria’s underdevelopment and its reputation at home and abroad. We assess this trajectory in the context of state fragility and “prebendalization” politics in a country with a powerful colonial legacy, and suggest a duality of order and disorder involving formal and informal structures of governance that impinge significantly on re-branding efforts.
ASPECTS OF KISWAHILI LANGUAGE IN MOYEZ VASSANJI’S FICTION
Godwin Siundu 한국외국어대학교 아프리카연구소 2020 Asian Journal of African Studies Vol.- No.48
This article problematizes the use of aspects of Kiswahili language in selected works of MG Vassanji, the most canonized East African writer of South Asian ancestry. The article begins by acknowledging two critical points regarding the use of Kiswahili in literatures by South Asian writers in the region: first, the place of the language in the region’s post-independence cultural politics of identities and, second, the practical question of audiences that a language enables or limits. The article suggests that a balance between these considerations explains why, for instance, while some South Asian writers in the region at some point wrote full length works in Kiswahili, this ‘experiment’ would later give way the English language as the predominant language of literary expression. At the same time, although the literary oeuvre of Vassanji and South Asian writers in the region has attracted varying critical responses from the region and beyond, such criticism has tended to focus on ‘bigger’ postcolonial concerns with the politics of racial affirmation and experiences of marginality. But the role of Kiswahili and its cultures in constituting these concerns remain either presumed or overlooked. Yet, the sense of marginality and otherness - with their socio-economic implications - that Vassanji recreates and critics theorise could have been impossible but for the predominant use of Kiswahili language in East Africa’s socio-political discourses. For instance, it was through Kiswahili language and its attendant cultures that post-independence attempts at rallying pan-Africanist based patriotism were inaugurated by the likes of Julius Nyerere and Jomo Kenyatta, the founding presidents of Tanzania and Kenya, respectively. Against this background, the current article interrogates how Vassanji navigates the possibilities and limits of Kiswahili language and the cultures it engenders to interpret South Asian worlds in East Africa.
Low-Cycle Fatigue Behavior of Reduced Activation Ferritic-Martensitic Steel at Elevated Temperatures
Godwin Kwame Ahiale,Won‑Doo Choi,Seungyon Cho,Yi‑Hyun Park,Young‑Bum Chun,Yong‑Jun Oh 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.1
Changes in the low-cycle fatigue (LCF) behavior of reduced activation ferritic-martensitic (RAFM) steel containing trace amount of Zr—namely, Advanced Reduced Activation Alloy (ARAA) were presented in the temperature range of 573 to 873 K. The fatigue lifetime decreased significantly as the temperature increased from 573 to 823 K, but it was rather similar between 823 and 873 K, where the tensile properties deteriorated most rapidly. The decrease in lifetime at elevated temperatures is mainly due to the disappearance of the initial tempered martensitic structure during cycling resulting in rapid cyclic softening and local oxidation at surface slip bands which led to earlier crack initiation. The fatigue lifetime and cyclic softening behavior of ARAA were compared with those of the other conventional RAFM steels.