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RISS 인기검색어
- 검색키워드
- 저자 : Raif Sakin (검색결과 2 건)
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Raif Sakin 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.19 No.6
The aim of this study is to investigate the relationship between Barcol hardness (H) and flexural modulus (E) degradation of composite sheets subjected to flexural fatigue. The resin transfer molding (RTM) method was used to produce 3-mm-thick composite sheets with fiber volume fraction of 44%. The composite sheets were subjected to flexural fatigue tests and Barcol scale hardness measurements. After these tests, the stiffness and hardness degradations were investigated in the composite sheets that failed after around one million cycles (stage III). Flexural modulus degradation values were in the range of 0.41-0.42 with the corresponding measured hardness degradation values in the range of 0.25-0.32 for the all fatigued composite sheets. Thus, a 25% reduction in the initial hardness and a 41% reduction in the initial flexural modulus can be taken as the failure criteria. The results showed that a reasonably well-defined relationship between Barcol hardness and flexural modulus degradation in the distance range.
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Raif Sakin 한국섬유공학회 2021 Fibers and polymers Vol.22 No.2
In this study, a satisfactory number of actual test results were used to optimize the stacking sequence design ofbidirectional glass-woven fabrics in polyester composite laminates. In optimization, parameters such as glass-woven fabricswith five different areal weights, stacking sequence, number of plies (PLY), and off-axis fiber directions (DEG) were taken asinput factors. Values such as tensile strength (UTS) and flexural strength (UFS), mechanical anisotropy factors (AFs), andresin permeability coefficient of stacked glass-fabrics were taken as output responses. In this study, a laboratory-scalevacuum assisted resin transfer molding (VARTM) process was established. Composite laminates with sixteen differentstacking and six different number of plies are produced. Mechanical properties such as tensile and three-point flexure havebeen tested for the composite laminates obtained. In addition, the resin permeability coefficient for each laminate and the AFfor tensile and flexural module depending on fiber direction were calculated during production. Many actual test data wereobtained versus response to seven factors and five variables. Instead of the experimental designs recommended in responsesurface methodology (RSM), 64 actual test data were used as responses of the model. In the optimization with the Minitab,the minimum mechanical AF was desired in return to maximum UTS, UFS, and permeability coefficient. Optimum stackingsequence, PLY, DEG, permeability coefficient, and AFs were determined through using RSM. Consequently, the mostoptimal composite laminate was suggested in real terms in the desirability rate of laminate D=0.6731 with the stackingsequence of [822252]6, six plies, and 0 °/90 ° fiber direction.
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