热塑性纤维铺放构件的层间剪切强度及孔隙率

Interlaminar Shear Strength and Porosity of Thermoplastic Fiber Placement Component

热塑性纤维(AS4/PEEK,熔点温度343℃)铺放采用的是原位固化工艺技术,铺放成型后热塑性纤维铺放构件层间性能直接影响构件的力学性能。本工作根据均匀试验法原理设计并进行铺放试验,得到构件的剪切强度和孔隙率,分析铺放工艺参数对铺放构件的层间剪切强度和孔隙率的影响规律,采用SEM对构件的断面层间进行观测,同时优化热塑性纤维铺放构件的剪切强度和孔隙率。结果表明:在铺放试件性能检测数据的基础上,随着加热温度和铺放压力的升高和增大,层间剪切强度也增大,而随着铺放速度的加快,层间剪切强度反之降低;孔隙率与铺放速度及加热温度呈正相关,随铺放压力的增大而降低。当铺放速度为6.00 mm/s、加热温度为699.35℃、铺放压力为539.94 N时,预测构件层间剪切强度最高为52.15 MPa;当铺放速度为6.00 mm/s、加热温度为630.04℃、铺放压力为530.00 N时,预测构件孔隙率最小为1.98%,最后试验测试得到的结果与预测结果基本一致。本工作的研究结果在我国制造业领域中热塑性纤维的应用方面具有一定的实用价值。

The in-situ curing technology is applied in the thermoplastic fiber(AS4/PEEK,melting point temperature 343℃)placement,so the interlaminar property directly affect the mechanical properties of the thermoplastic composite component after placement.In this paper,accor-ding to the principle of uniform test method,the placement test and interlaminar property test were designed,the data of interlaminar shear strength and porosity were obtained.The cross-sectional laminates were observed by SEM,at the same time,the interlaminar shear strength and porosity of the thermoplastic fiber placement component were optimized.Results showed that,based on the performance test data of the placement test component,it is obtained that as the heating temperature and the placement pressure increase,the interlaminar shear strength increases and as the placement speed increases,the interlaminar shear strength decreases on the contrary;the porosity has a positive correlation with the placement speed and heating temperature,and decreases with the increase of the placement pressure.When the placement speed is 6.00 mm/s,the hot air temperature is 699.35℃and the placement pressure is 539.94 N,the maximum interlaminar shear strength of the component was predicted to be 52.15 MPa;when the placement speed is 6.00 mm/s,the hot air temperature is 630.04℃and the placement pressure is 530.00 N,the minimum porosity of component was predicted to be 1.98%.The final test results are basically consistent with the prediction results,which has a certain practical value for the application level of thermoplastic fiber in the manufacturing field of our country.