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Comparison of structural design and future trends in composite hulls: A regulatory review
Han Zhiqiang,장재원,Souppez Jean-Baptiste R.G.,서형석,오대균 대한조선학회 2023 International Journal of Naval Architecture and Oc Vol.15 No.-
Recently, the International Organization for Standardization (ISO) standards associated with composite hullstructure design, including the method for estimating the mechanical properties of laminates necessary for design, have been revised. This study reviews the revisions concerning materials and analyzes the design trend of composite hull structures by comparing eight related rules, including classification society and domestic rules. The results reveal that the current design trend of hull laminates is to thoroughly consider the impact of several variables, including the weight fraction of reinforcement (glass content; Gc), fabric combination, and fabrication method, on the laminate properties. For illustration, these effects were verified with a typical glass-fiberreinforced plastic vessel based on a case study, the experimental results of extant studies, and current standards. The industry design conditions, normal Gc (0.367) and high Gc (0.600), were selected and applied to two fabric combinations: chopped strand mat and chopped strand–woven roving. The hull laminate design results based on the revised ISO standards (ISO 12215) satisfied the safety and weight requirements for normal Gc in both cases. This may be attributed to the high mechanical properties suggested in the current standards regardless of how they reflect the effects of changes in fabric type, combination, and method on the mechanical properties of the laminates. For high Gc, the combination material case satisfied the safety requirements to a greater extent. and this can also be made lightweight. In contrast, the single material case based on the revised ISO standard may result in safety issues, mainly because the revised ISO standard reflects the adverse effects of design variables such as Gc and fabric blends on the laminate fabrication quality. Further, non-ISO rules should be revised in the future to reflect the effects of each variable in the material design according to the research trends of composite materials.
Effects of fabric combinations on the quality of glass fiber reinforced polymer hull structures
오대균,장재원,Jee Jae-hoon,Kwon Yongwon,Im Sanghyuk,HANZHIQIANG 대한조선학회 2022 International Journal of Naval Architecture and Oc Vol.14 No.1
Conventionally, Chopped Strand Mat (CSM) and Woven Roving Mat (WRM) fabrics are combined to manufacture Glass Fiber Reinforced Polymer (GFRP) laminate structures for small vessels, such as fishing boats and yachts, according to established practical experience and traditional methods rather than the application of elaborate design rules. Combinations of the aforementioned fabrics positively contribute to improve the strength of hull structures. In this study, effects of fabric combination types on the quality of GFRP structures such as hull plates are quantitatively verified through experiments and statistical analysis. The results confirm the following: (1) hull plates fabricated by combining CSM and WRM exhibit enhanced strength in the normal glass fiber weight fraction (Gc) regions with an E-glass fiber content of 30e50%, and (2) the effect of reducing the amount of decrease in the strength is observed in high-Gc regions with an E-glass fiber content of 50% or higher. Furthermore, a combination of these fabrics demonstrated a significant effect in improving the quality of the composite laminates owing to a reduction in void defects in the hull plates.