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Prabhakar Misra¹, Silvina Gatica¹, Daniel Casimir¹
Structural Longevity, Vol.7, No.3, pp. 135-142, 2012, DOI:10.3970/sl.2012.007.135
Abstract Atomic Force Microscopy of hydrophobic material surfaces in water shows the presence of closely spaced soft domains. The radii of curvature of these features are of the order of 100 nm and their heights above the substrate are in the range 20-30 nm. The consensus interpretation of these features is that they are nanosized gas bubbles formed on the substrate following immersion. A recent study on interfacial wetting at epitaxial graphene, with its combined use of experimental and computational approaches, showed that the macroscopic contact angle of water on epitaxial graphene layers is correlated with… More >

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G.D. Hatzigeorgiou¹, D.E. Beskos²
Structural Longevity, Vol.7, No.3, pp. 143-149, 2012, DOI:10.3970/sl.2012.007.143
Abstract In this paper, a systematic investigation is carried out on the seismic behaviour of plane moment resisting steel frames (MRF) and plane concentrically X-braced steel frames (CBF) to multiple strong ground motions. Such a sequence of earthquakes results in a significant damage accumulation in a structure because any rehabilitation action between any two successive seismic motions cannot be practically materialised due to lack of time. In this work, thirty-six MRF and thirtysix CBF which have been designed for seismic and vertical loads according to European codes are subjected to five real seismic sequences which are More >

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Wei-Chung Wang¹, Yu-An Chiang¹, Yi-Chieh Ho¹, Hung-Tsan Shen¹, Ting-Yu Chang¹, Ya-Hsin Chang¹, Chun-Sheng Tsao¹
Structural Longevity, Vol.7, No.3, pp. 151-160, 2012, DOI:10.3970/sl.2012.007.151
Abstract The rapid development of soft materials in recent years gives revolutionary impact on electronics and biomedical industries. To better control the quality and key technology, mechanical properties of soft materials employed in electronics and biomedical industries must be accurately determined By employing the non-destructive, non-contact and whole-field characteristics of the threedimensional (3D) digital image correlation (DIC) method, epoxy resin used in photoviscoelasticity, mechanical properties of optical films used in backlight modules and artificial meshes used in biomedical applications were investigated in this paper. It was found that satisfactory accuracy and measurement range can be obtained More >

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D.H. Lee¹, W.H. Park¹, W.S. Jung¹
Structural Longevity, Vol.7, No.3, pp. 161-166, 2012, DOI:10.3970/sl.2012.007.161
Abstract To estimate heat release rate (HRR) for a large structure with a fullscale fire test using the oxygen consumption method, a large calorimeter is used to inhale all combustion gas from combustibles. However, it is hard to inhale all combustion gas into the calorimeter completely. In this case, the summation method is effective because it estimates the HRR of the test subject by sum the HRR of small specimens. This study assumed the HRR fire curves of a simple single sheet material, a train seat assembly, and a room-scale train saloon mockup using a compensated More >

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B. Ramesh, T. Senthilvelan
Structural Longevity, Vol.7, No.3, pp. 167-185, 2012, DOI:10.3970/sl.2012.007.167
Abstract Friction factor plays decisive role in the overall integrity of metal forming processes. As the friction during deformation influences the applied load, product shape, surface quality, internal structure, it is of paramount importance to know its influential parameters .In this investigation, the friction factor at unlubricated and Lubricated conditions with SAE 40 oil, Molydenum Disulphide, Graphite as lubricant at different temperatures has been analyzed. Among the lubricant, it is found that molybdenum-disulphide acts as a good lubricant at various temperature. Experiments were conducted to determine the friction factor, subsequently the true stress, true strain curves More >

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J. Milewski¹, Ł. Szabaowski¹, J. Kuta¹
Structural Longevity, Vol.7, No.3, pp. 187-202, 2012, DOI:10.3970/sl.2012.007.187
Abstract The paper presents a control strategy concept of a piston engine fueled by Natural Gas as a DG unit obtained by using an Artificial Neural Network. The control strategy is based on several factors and directs the operation of the unit in the context of changes occurring in the market, while taking into account the operating characteristics of the unit. The control strategy is defined by an objective function: for example, work at maximum profit, maximum service life, etc. The results of simulations of the piston engine as a DG unit at chosen loads are More >

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