Optimal Design Of Thermoplastic Continuous Fiber Body Parts Based On Mixed Layup

Continuous carbon fiber-reinforced composite materials(CCFRPs)have many advantages such as high specific strength,high rigidity,and good chemical stability.The molded products can even be used as structural parts,but the complex structure of CCFRPs is difficult to form and the cost of carbon fiber materials High,limits the application of CCFRPs in a wider range.This article aims to solve the difficult molding problem by optimizing the molding conditions,and reduce its cost and improve the economy through a reasonable process.In this paper,the experimental square box was prepared using the PA6 carbon fiber single item belt and PA6 glass fiber unidirectional belt produced by the domestic Nanjing Wolaite New Material Co.,Ltd.Because the square box has chamfering and multi-chamfer transition areas,there is a certain depth of drawing.A typical assessment.For the external surface quality of the square box,firstly through the square box molding experiment,it was found that the mold surface temperature is the biggest factor affecting the surface quality,thereby optimizing the process parameters of the square box molding,and solving the current continuous fiber reinforced thermoplastic composite products molding difficulty The problem is that the square box is thoroughly formed,the surface of the square box is smooth,without wrinkles and other surface quality problems;through the relatively low ignition point of PA6(550 ?),the resin is burned off by the muffle furnace combustion method,and the carbon fiber wire is retained to observe each layer of carbon fiber The continuity of the wire shows that the fiber wire will not be damaged during the forming process of the square box.Through the selection and combination of four lay angles of 0°,90° and ±45° for carbon fiber square box and glass fiber square box,a series of experiments were designed to explore the layup under the principle of uniformity and symmetry of lay angle The effect of angle and layering sequence on the pressure-bearing properties of box-shaped products.The results obtained through the static load crushing experiment using a universal stretching machine showed that the peak pressure of 5 different carbon fiber lay square boxes was 67KN-72 KN,and the peak force of 3 different glass fiber lay square boxes was 48 KN-51.KN confirmed that under the principle of uniformity and symmetry of the lay angle,the lay order of the lay angle does not significantly affect the static load performance of the box-shapedcomposite product.In view of the high cost of carbon fiber composite products,the research idea of ??glass fiber layup mixed carbon fiber layup was explored,and the type ? mixed layup method in which the glass fiber layup was all laid on the upper part of the square box had the best performance.In terms of load bearing capacity,the carbon fiber square box is about 68 KN,and the type III mixed layup method square box is also about 68 KN,and there is no major fracture in the failure mode.In terms of dynamic load energy absorption,the type III mixed layup method is The box is basically similar to the carbon fiber square box,all around 64 J.The optimal mixed-layer square box does not weaken the mechanical properties of the square box,meets the requirements of the square box's service performance,and saves half the amount of carbon fiber layup,ensuring the economics of composite products..