Zhang Dechao, Zhan Lihua, Guan Chenglong, Guo Jinzhan, Ma Bolin, Dai Guangming, Yao Shunming
Light Alloys Research Institute, Central South University, Changsha 410083, China.
College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.
Polymers (Basel). 2023 Jan 6;15(2):296. doi: 10.3390/polym15020296.
Vibration pretreatment microwave curing is a high-quality and efficient composite out-of-autoclave molding process. Focusing on interlaminar shear strength, the effects of pretreatment temperature, pretreatment time and vibration acceleration on the molding performance of composite components were analyzed sequentially using the orthogonal test design method; a scanning electron microscope (SEM) and optical digital microscope (ODM) were used to analyze the void content and fiber-resin bonding state of the specimens under different curing and molding processes. The results show that the influence order of the different vibration process parameters on the molding quality of the components was: vibration acceleration > pretreatment temperature > pretreatment time. Within the parameters analyzed in this study, the optimal vibration pretreatment process parameters were: pretreatment temperature of 90 °C, pretreatment time of 30 min, and vibration acceleration of 10 g. Using these parameters, the interlaminar shear strength of the component was 82.12 MPa and the void content was 0.37%. Compared with the microwave curing process, the void content decreased by 71.8%, and the interlaminar shear strength increased by 31.6%. The microscopic morphology and mechanical properties basically reached the same level as the standard autoclave process, which achieved a high-quality out-of-autoclave curing and molding manufacturing of aerospace composite components.
振动预处理微波固化是一种高质量、高效率的复合材料非热压罐成型工艺。以层间剪切强度为重点，采用正交试验设计方法依次分析了预处理温度、预处理时间和振动加速度对复合材料构件成型性能的影响；利用扫描电子显微镜（SEM）和光学数码显微镜（ODM）分析了不同固化成型工艺下试样的孔隙率和纤维-树脂粘结状态。结果表明，不同振动工艺参数对构件成型质量的影响顺序为：振动加速度＞预处理温度＞预处理时间。在本研究分析的参数范围内，最佳振动预处理工艺参数为：预处理温度90℃、预处理时间30min、振动加速度10g。采用这些参数时，构件的层间剪切强度为82.12MPa，孔隙率为0.37%。与微波固化工艺相比，孔隙率降低了71.8%，层间剪切强度提高了31.6%。微观形貌和力学性能基本达到标准热压罐工艺水平，实现了航空航天复合材料构件的高质量非热压罐固化成型制造。
