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Experimentally Study on Mechanical Properties of RTMCs with Wrinkled Fabrics
Thanh Trung Do(도탄쭝),Dong Joo Lee(이동주) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
During the preform loading process of Resin Transfer Molding (RTM), the wrinkled fabric preform can be occurred and affects mechanical properties of the finished products depending on loading types and loading speeds. In this study, different loading speeds of 3, 5, 15 and 50 ㎜/min. were examined under the threepoint bending test. It is found that trend of the bending modulus and strength tends to increase with the loading speed as well as the number of fabric plies in the preform for both normal and wrinkled models. Also, safety of the composite with wrinkling was considered as functions of the ratio of wrinkled length to span length (L<SUB>w</SUB>/L) and the loading speed. It is found that the ‘safe wrinkled length’ of the composite with a high loading speed was shorter than that of the composite with a low loading speed for the same number of fabric plies in the preform. In addition, the simple tensile test with a loading speed of 3 ㎜/min. was compared with the bending results to enhance the understanding of failure mechanisms that are depending not only on preform architectures but also on loading conditions.
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쉬자웨이(Jiawei Xu),도탄쭝(Thanh Trung Do),이동주(Dong Joo Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The carbon nano-tube(CNT)/silicone composite is fabricated by the transfer molding(TM) under different molding conditions such as inlet number, CNT content and solvent percentage. Also, those conditions are compared as a function of specimen thickness. It is found that the alignment of CNT is dependent on the molding design and processing conditions. And, it affects the mechanical and electrical properties of composites. For the case of two-inlet, the weld line is formed when two separate flow fronts are travelled in the opposite directions and meet to create the bond area, which might degrade the tensile strength of composites. Also, bond areas provide the connection of CNT and give low electrical resistivity. In addition, the measured electrical resistivity (volume and surface) with the sample accommodated in the electrode for composites are reported and examined based on the numerical analysis.
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