Zhang Dechao, Zhan Lihua, Ma Bolin, Guo Jinzhan, Jin Wentao, Hu Xin, Yao Shunming, Dai Guangming
Light Alloys Research Institute, Central South University, Changsha 410083, China.
State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University, Changsha 410083, China.
Polymers (Basel). 2024 Sep 4;16(17):2518. doi: 10.3390/polym16172518.
The vibration pretreatment-microwave curing process can achieve high-quality molding under low-pressure conditions and is widely used in the curing of resin-based composites. This study investigated the effects of the vibration pretreatment process parameters on the void content and the fiber weight fraction of T700/TRE231; specifically, their influence on the interlaminar shear strength and impact strength of the composite. Initially, an orthogonal experimental design was employed with interlaminar shear strength as the optimization target, where vibration acceleration was determined as the primary factor and dwell time as the secondary factor. Concurrently, thermogravimetric analysis (TGA) was performed based on process parameters that corresponded to the extremum of interlaminar shear strength, revealing a 2.17% difference in fiber weight fraction among specimens with varying parameters, indicating a minimal effect of fiber weight fraction on mechanical properties. Optical digital microscope (ODM) analysis identified interlaminar large-size voids in specimens treated with vibration energy of 5 g and 15 g, while specimens subjected to a vibration energy of 10 g exhibited numerous small-sized voids within layers, suggesting that vibration acceleration influences void escape pathways. Finally, impact testing revealed the effect of the vibration pretreatment process parameters on the impact strength, implying a positive correlation between interlaminar shear strength and impact strength.
振动预处理 - 微波固化工艺能够在低压条件下实现高质量成型，并且广泛应用于树脂基复合材料的固化。本研究调查了振动预处理工艺参数对T700/TRE231的孔隙率和纤维重量分数的影响；具体而言，是它们对复合材料层间剪切强度和冲击强度的影响。最初，采用正交试验设计，以层间剪切强度作为优化目标，其中将振动加速度确定为主要因素，保压时间确定为次要因素。同时，基于对应于层间剪切强度极值的工艺参数进行了热重分析（TGA），结果显示不同参数的试样之间纤维重量分数存在2.17%的差异，表明纤维重量分数对力学性能的影响极小。光学数字显微镜（ODM）分析在振动能量为5g和15g处理的试样中识别出层间大尺寸孔隙，而振动能量为10g的试样在层内呈现出大量小尺寸孔隙，这表明振动加速度会影响孔隙逸出路径。最后，冲击试验揭示了振动预处理工艺参数对冲击强度的影响，意味着层间剪切强度与冲击强度之间存在正相关关系。
