• Composites Research
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• v.33 no.2
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• pp.44-49
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• 2020

The cure kinetics of carbon fiber-reinforced prepreg for Vacuum Bag Only(VBO) process was studied by differential scanning calorimetry (DSC). The total heat of reaction (ΔH_total = 537.1 J/g) was defined by the dynamic scanning test using prepregs and isothermal scanning tests were performed at 130℃~180℃. The test results of isothermal scanning were observed that the heat of reaction was increased as the temperature elevated. The Kratz model was applied to analyze the cure kinetics of resin based on the test results. To verify the simulation model, the degree of cure from panels using different cure cycles were compared with the measurement. The simulation model showed that the error against the experimental value was less than 3.4%.

• Transactions of the Korean Society of Mechanical Engineers
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• v.13 no.3
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• pp.479-489
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• 1989

The $J_{k}$ integral method for determining mixed mode stress intensity factors separately in the cracked anisotropic plate is developed. Stress intensity factors are indirectly determined from the values of $J_{1}$ and $J_{2}$. The $J_{2}$ integral can be evaluated efficiently from a finite element solution, neglecting the contribution from the portion of the integration contour along the crack faces, by selecting the integration contour in the vicinity of the crack tip. Using functions of a complex variable, the complete relations between $J_{1}$, $J_{2}$ and $K_{I}$ , $K_{II}$ for anisotropic materials are derived conveniently by selecting narrow rectangular contours shrinking to the crack tip. Compared to the existing path independent integral methods, the present method does not involve calculating the auxiliary solution and hence numerical procedures become quite simple. Numerical results to various problems are given and demonstrate the accuracy, stability and versatility of the method.

• Journal of Digital Convergence
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• v.20 no.4
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• pp.597-606
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• 2022

This study attempted to find a new manufacturing method through Basalt fiber and resin infusion method to expand the range of expressions of Contemporary jewelry produced in studios. To this end, the concept of fiber introduction and infusion method was examined through analysis of used cases, and based on this, flat plates and color samples were produced, and then the samples were made to estimate the possibility of direct use in jewelry. As a result, the infusion method process presented certain results that could be used as a production process in the studio, and Basalt fibers were able to express various colors of spray and porselin, especially fiber its painted with porselin, which have high strength and they can be expressed intentionally, it are very valuable as jewelry's material, it is expected to be an opportunity to expand the practical production methods and expressions of Contemporary jewelry.