EFFECT OF FABRIC STRUCTURE ON 3D PERMEABILITY IN LCM PROCESS

To the study of resin flow and 3D permeability in thicker fabric preforms during the liquid composite molding(LCM) process,the experimental study of the internal flow behavior and permeability in thicker fabric structure reinforcement had been investigated by using of ultrasound sensor monitor technique testing device.Processes of the LCM are widely used in composites produced by impregnation of a dry preform with liquid resin.In generally,resin flow in the thickness direction can be neglected for thin parts,but the resin flow in the transverse direction is important for thicker parts.For manufacturing large size or high thickness composite parts,the transverse permeability of fibrous composite reinforcements has been evaluated at first.In this work,the experiment was indirectly monitoring the tracking flow front on-line with ultrasound sensors system outside of fabric preforms.The internal permeable properties of glass fiber reinforcement fabrics with different structures were studied.By comparing the flow front and transverse permeability in different fabric structure,woven density fabric and yarn linear density,the result show that structural parameters of fabric preform have different effect on the internal flow behavior and permeability performance.