Influence of a Dynamic Consolidation Force on In Situ Consolidation Quality of Thermoplastic Composite Laminate
Influence of a Dynamic Consolidation Force on In Situ Consolidation Quality of Thermoplastic Composite Laminate
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DOI：
10.3390/jcs5030088
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发表时间：
2021-03-01
影响因子：
3.3
通讯作者：
Schwinn, Max
中科院分区：
文献类型：
--
作者：
Denkena, Berend;Schmidt, Carsten;Schwinn, Max
为了实现高质量的热塑性塑料纤维自动铺放原位固结，本研究提出了一种方法。该方法涉及材料预热和亚超声振动处理相结合。因此，本研究探讨频率相依性固结压力对固结质量的影响。在万能试验机上，采用电阻加热代替激光加热，建立了一种简化的热固结条件实验装置。进行了频率高达1 kHz的固结实验。用激光扫描显微镜检查所制造的试样，以评估结合界面和差示扫描量热法，以评估结晶度。此外，振动辅助的标本进行了比较，与静态固结压力的标本。作为实验研究的结果，层间孔隙分数和压实度显示出对较高频率的正相关性。当振动频率增加到1 kHz时，孔隙率从0.60%降低到0.13%，而压实度从8.64%增加到12.49%。差示扫描量热实验表明，振动辅助固结对基体结晶度没有影响。
For achieving high quality of in situ consolidation in thermoplastic Automated Fiber Placement, an approach is presented in this research work. The approach deals with the combination of material pre-heating and sub-ultrasonic vibration treatment. Therefore, this research work investigates the influence of frequency dependent consolidation pressure on the consolidation quality. A simplified experimental setup was developed that uses resistance electrical heating instead of the laser to establish the thermal consolidation condition in a universal testing machine. Consolidation experiments with frequencies up to 1 kHz were conducted. The manufactured specimens are examined using laser scanning microscopy to evaluate the bonding interface and differential scanning calorimetry to evaluate the degree of crystallinity. Additionally, the vibration-assisted specimens were compared to specimens manufactured with static consolidation pressure only. As a result of the experimental study, the interlaminar pore fraction and degree of compaction show a positive dependency to higher frequencies. The porosity decreases from 0.60% to 0.13% while the degree of compaction increases from 8.64% to 12.49% when increasing the vibration frequency up to 1 kHz. The differential scanning calorimetry experiments show that the crystallinity of the matrix is not affected by vibration-assisted consolidation.