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| Effects of Automated Fiber Placement Heating Uniformity and Temperature on Mechanical Properties of Composite |
| DENG Linwei1 , PU Yuanzhu1 , ZHANG Shaoqiu2 , YANG Heng2 , HAN Miaoling1 |
| (1. Beijing Spacecrafts, Beijing 100094, China; 2. Shaanxi Pulitong Composite Technology Co., Ltd., Weinan 714000, China) |
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Abstract Automated fiber placement (AFP) is one of the most advanced high-performance aerospace composite manufacturing technology. In order to further study the influence of heating temperature on the properties of composite in AFP technology, a heat transfer model of infrared heating system in AFP process was established. Based on this model, the temperature control method of AFP and the uniformity of temperature distribution in the prepreg layers were analyzed, and the influence of heating temperature on the mechanical properties of composite was studied experimentally. The results show that the heating temperature is the key process parameter affecting the mechanical properties of the composite. When the heating temperature was set at 35℃ , the tensile strength, bending strength and interlaminar shear strength of the composite specimens made in this paper increased by 20.9%, 12.4% and 4.9%, respectively. Pre-curing of prepreg tows due to over-high local temperature of the prepreg caused by uneven heating, and the resin-poor regions caused by resin flow under the combined action of local high pressure and temperature probably is the one of reasons leading to the deterioration of composite properties.
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2021, 
