: In this study, aspect ratio and major axis of fiber bundle cross-section of braiding yarns, and gap between braiding yarns obtained from cross-sectional observation were approximated as a function of distance between braiding yarns. And the prediction method of interrelationship between internal structures for designing braided composites was proposed. In addition, the prediction method were utilized to predict thickness of layered braided fabrics considering nesting of each layers for designing stiffness of braided composite structure.
The purpose of this study is to clarif シ effects of fabrication condition on fiber orientation state and mechanical properties of braided CFRP pipcs . Two types of braided CFRP pipes, cylinder pipes and reCtangular pipes were fabricated . And the braided CFRP pipes with longitUdinal fibers and those without longitudinal fibers were also fabricated by changing braiding angle . Four − point bending test was performed for each specimen . The bending modulus ofboth of cylinder pipes and rectangular pipes was increased with a decrease in the braiding angle. The bending st1 ℃ ngth of cylinder pipes was inoreased with a decrease in the braiding angle , but that ofrectangular pipes with longitudinal 且bers was decreased with a decrease in the braiding angle . By measuring the strains and observe the cross section of the sp imens , the f( ) 110Wing factors tO decrease the bending strength were clarified , The factors were stress con 。entration caused by localized deformation and Performance decline offiber strength caused by the crimps ofthe middle − end −fiber .
The braided fabrics are one of the typical textiles and have been expected to be an excellent performs for the reinforcements of composite materials. Fig.1 shows schematic drawing of a braided fabric. Braided fabrics are composed of Braided Yarns (BY) oriented diagonally and Middle End Yarns (MEY) inserted into the fabric in longitudinal direction. In previous study, it was clarified that the internal structures for the braided fabric were decided with 4 parameters; area and cross-sectional shape of braiding yarns, the braiding angle and distance between braiding yarns. And it have been suggested that internal structural parameters for braided fabric reinforced composites with thermo-setting resin are possible to be predicted. However in the case of braided composites with thermoplastic resin, impregnation mechanism of thermoplastic resin with solid state is completely different from that of thermosetting resin with liquid state. In order to predict internal structures of braided composites with thermoplastic resin, it is necessary to investigate the impregnation process or mechanism of thermoplastic resin in to fiber bundles apply enough heat on thermoplastic resin to be liquid state for good impregnation especially in the case of intermediate material such as comingled yarn, and etc. The purpose of this study is to predict the relationship between dimensional and internal structural parameters for braided fabric reinforced thermoplastic composite. The braided fabric was fabricated with intermediate material such as commingled yarns. During molding with heat and pressure, effect of molding time on the mechanism of impregnation and internal structural parameters were investigated.
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