短碳纤维增强注塑聚醚醚酮复合材料微观结构与力学性能研究

实验结果表明:短碳纤维增强注塑聚醚醚酮(CF/PEEK)注塑板材中存在"皮-芯"次层微结构,用金相显微镜可以表征CF取向度不同的皮层和芯层的厚度,整板材料的力学性能可以根据皮层及芯层的厚度及其强度按"混合规则"计算。DSC法及热烘箱法研究表明,碳纤维取向结构和PEEK在皮层和芯层中的结晶度差异导致了板材内存在较大的内应力。

MICROSTRUCTURE AND MECHANICAL PROPERTY OF SHORT CARBON FIBER REINFORCED INJECTION- MOULDED PEEK COMPOSITES

Experimental results proved that submicrostructure existed in short carbon fiber rein- forced injection- moulded polyetherether ketone( PEEK) composites.The thickness of skin and core layers could be characterized by the metallographic optical microscope.Mechanical properties of the full plate could be calculated by the rule- of- mixture approach,in which the separately determined ten- sile strength and elastic modulus of the skin and core layers were combined with regard to their rela- tive contribution to the full thickness of the original sample.The great thermo- stress and anisotropic mechanical properties between the skin and core layers resulted from different fiber orientations and PEEK crystallinities.Therefore,correlation of submicrostructure and mechanical properties of skin and core layerswith the processing condition and mould configurationsbecame one of the mostimpor- tantwork for the product design of shortfiber reinforced injection- moulded plastics composites.