Effects of pressure, boundary conditions, and cutting reliefs on thermo-hydroforming of fiber-reinforced thermoplastic composite helmet based on numerical optimization
Effects of pressure, boundary conditions, and cutting reliefs on thermo-hydroforming of fiber-reinforced thermoplastic composite helmet based on numerical optimization
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基于数值优化的压力、边界条件和切削浮凸对纤维增强热塑性复合材料头盔热液压成型的影响
DOI：
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发表时间：
2021
影响因子：
3.3
通讯作者：
F. Pourboghrat
中科院分区：
文献类型：
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作者：
Hyunchul Ahn;N. Kuuttila;F. Pourboghrat
与叠层成形工艺相比，热液压成形工艺周期短，对材料微观结构影响小，是实现热塑性复合材料大批量生产的一种可行工艺。然而，与叠层技术不同的是，热液压成形会在成形零件上产生起皱。采用ABAQUS/CAE(6.14-1)对热液压成形工艺参数对热塑性头盔起皱的影响进行了数值研究。纤维增强聚合物复合材料的优化性能以前是由作者使用作为用户材料子程序(VUMAT)实现的首选纤维取向模型确定的。为了考虑层合复合材料各层之间的相互作用，采用了粘聚区模型。研究的目的是使用模拟工具来最小化成形头盔中的整体皱纹密度和皱纹高度作为流体压力、边界条件的函数，特别是毛坯形状和毛坯中的凸起切割。
Compared with layup techniques, thermo-hydroforming is shown to be a viable process for mass production of thermoplastic composite structures due to its relatively rapid cycle time and low impact on the microstructure of the material. However, unlike layup technique, thermo-hydroforming can produce wrinkles in the formed part. A research was conducted wherein ABAQUS/CAE (6.14-1) was employed to numerically study the impact of thermo-hydroforming process parameters on the formation of wrinkles in a thermoplastic helmet. The optimized properties of the fiber-reinforced polymer composite was previously determined by the authors using the preferred fiber orientation model implemented as a user material subroutine (VUMAT). To account for the interaction between different layers of the laminated composite, the cohesive zone model was employed. The objective of the study was to use the simulation tool to minimize the overall wrinkle density and wrinkle height in the formed helmet as a function of the fluid pressure, boundary conditions, and especially the blank shape and the relief cuts made in the blank.