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Simulation prediction of the fiber breakage history in regular and barrier structure screws in injection molding

机译：注射成型中规则屏障结构螺钉中纤维破损史的仿真预测

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>In recent years, the use of long fiber‐reinforced thermoplastics (LFRT) has become one of the most popular materials in lightweight applications. However, the microstructure of the fiber inside the plastic matrix is quite complex, making it hard to fully control the fiber effect in the injection molding process. On the other hand, the screw structure and operation will affect the residual fiber length significantly. However, the mechanism of how the screw influences the fiber breakage is still not yet clear. Thus, in this study, we apply the screw plastication in the injection molding process to investigate the fiber microstructure mechanism. The results show that more severe fiber breakage occurs when the compression force increases abruptly. Generally speaking, the breakage increases from the compression to the metering section. One effective method to reduce the fiber breakage is to increase the channel depths in both the feeding and the metering sections while taking the plastic melt quality into consideration. Moreover, the fiber breakage phenomena for two types of fibers are also investigated. Evidently, carbon fiber is easier to be broken. Its length distribution has a higher peak at the exit of the screw. This discovery is consistent with the experimental results of the current literature studies. POLYM. ENG. SCI., 58:452–459, 2018. ? 2017 Society of Plastics Engineers
机译： >近年来，使用长纤维增强热塑性塑料（LFRT）已成为最受欢迎的一种轻量级应用中的材料。然而，塑料基质内部的纤维的微观结构非常复杂，使得难以充分控制注塑过程中的纤维效应。另一方面，螺杆结构和操作将显着影响残留纤维长度。然而，螺杆如何影响纤维破裂的机制尚不清楚。因此，在本研究中，我们在注射成型过程中应用螺钉唾液以研究纤维微结构机构。结果表明，当压缩力突然增加时，会发生更严重的纤维破裂。一般而言，断裂从压缩到计量部分增加。减少纤维破裂的一种有效方法是在考虑塑料熔体质量的同时增加馈电和计量部分中的沟道深度。此外，还研究了两种类型纤维的纤维破裂现象。显然，碳纤维更容易被打破。其长度分布在螺钉的出口处具有更高的峰值。这一发现与当前文献研究的实验结果一致。聚合物。 eng。 SCI。，58：452-459,2018。？ 2017年塑料工程师协会

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