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- 저자 : Jose I. Rojas-Mendez (검색결과 2 건)
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An experimental and numerical investigation on fatigue of composite and metal aircraft structures
Siddharth Pitta,Jose I. Rojas-Mendez,Francesc Rour,Daniel Crespo,Magd Abdel Wahab 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.1
The static strength and fatigue crack resistance of the aircraft skin structures depend on the materials used and joint type. Most of the commercial aircraft’s skin panel structures are made from aluminium alloy and carbon fibre reinforced epoxy. In this study, the fatigue resistance of four joint configurations (metal/metal, metal/composite, composite/composite and composite/metal) with riveted, adhesive bonded, and hybrid joining techniques are investigated with experiments and finite element analysis. The fatigue tests were tension-tension because of the typical nature of the loads on aircraft skin panels susceptible of experimenting fatigue. Experiment results suggest that the fatigue life of hybrid joints is superior to adhesive bonded joints, and these in turn much better than conventional riveted joints. Thanks to the fact that, for hybrid joints, the adhesive bond provides better load distribution and ensures load-carrying capacity in the event of premature adhesive failure while rivets induce compressive residual stresses in the joint. Results from FE tool ABAQUS analysis for adhesive bonded and hybrid joints agrees with the experiments. From the analysis, the energy release rate for adhesive bonded joints is higher than that of hybrid joints in both opening (mode I) and shear direction (mode II). Most joints show higher energy release rate in mode II. This indicates that the joints experience fatigue crack in the shear direction, which is responsible for crack opening
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Jianyao Li,Fang Liu,Jose I. Rojas-Mendez 서울대학교 교육연구소 2013 Asia Pacific Education Review Vol.14 No.3
Previous research studies identified country image as an important variable in international students’ selection of onshore programs, and it is often perceived that there is little difference between onshore and offshore program selection. Looking at a sample of high school students in China and their selections of offshore programs (from a sample program in Australia, the UK, and the US), this study reveals an insignificant influence of country image. Instead, both higher education country image and the local partner institution image significantly influence the students’ selections. The findings also indicate that the effects of attitude toward behavior, subject norm, and perceived behavioral control appear to be more significant than those of the images in most of the analyses. Implications for international educators and marketers of offshore programs are discussed.
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