连续纤维增强PEEK增材制造力学性能与成型质量优化

Parameter Optimization of Mechanical Properties and Forming Accuracy for Continuous Fiber Reinforced PEEK Additive Manufacturing

针对连续纤维增强聚醚醚酮(PEEK)复合材料增材制造中的界面结合差、制件精度不高等技术瓶颈,基于多热力场耦合作用下的连续纤维增材制造成型工艺,实现了典型样件的3D打印制备。基于正交实验设计,并通过微观形貌表征和力学性能测试,探究了喷头温度、打印速度和分层厚度对打印制件的表面粗糙度和弯曲性能的影响规律,获得连续纤维增强PEEK复合材料增材制造成型优化工艺参数。结果表明,分层厚度对表面粗糙度、弯曲强度和弯曲弹性模量具有显著影响,而打印速度和喷头温度对力学性能和成型精度影响较小。分层厚度越小,打印道间结合质量越好,成型制件表面粗糙度越小,弯曲弹性模量和弯曲强度越高。最优工艺参数为喷头温度390℃、打印速度2 mm/s和分层厚度0.4 mm。经试验验证,最优工艺参数下表面粗糙度达到最小为24.99μm,弯曲弹性模量和弯曲强度分别达到最大为57.05 GPa和355.07 MPa。

Aiming at solving the technical bottleneck of poor interface bonding and low precision in the additive manufacture of continuous fiber reinforced polyetheretherketone(PEEK)composites,the 3D printing preparation of typical samples was realized using the continuous fiber additive manufacturing process under the multiple thermo-mechanical coupling effects.On the basis of orthogonal experimental design,the effects of nozzle temperature,printing speed and delamination thickness on the surface roughness and bending properties of printed parts were explored through the micro morphology characterization and mechanical properties test,and the optimized process parameters of continuous fiber reinforced PEEK composite additive manufacturing were obtained.The results show that the delamination thickness presents a significant effect on the surface roughness,bending strength and bending modulus,while the printing speed and nozzle temperature show little effects on the mechanical properties and forming accuracy.With the decrease of layer thickness,the bonding quality between single printing paths becomes better,the surface roughness is decreased,the bending modulus and bending strength are improved.The optimum process parameters are gained with nozzle temperature of 390℃,printing speed of 2 mm/s and delamination thickness of 0.4 mm.Under the optimal process parameters,the minimum surface roughness is 24.99μm,and the maximum bending modulus and bending strength are 57.05 GPa and 355.07 MPa respectively.