聚芳醚酮(PAEK)树脂熔体黏度及冲击能量对其复合材料冲击损伤行为的影响  

Effect of melt viscosity and impact energy of poly aryl ether ketone(PAEK)resins on the impact damage behavior of their composites

作　　者：顾洋洋 张金栋 刘刚 刘衍腾 甘建[2] 杨曙光[1] GU Yangyang;ZHANG Jindong;LIU Gang;LIU Yanteng;GAN Jian;YANG Shuguang(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Chengdu Institute of Aircraft Design,Chengdu 610091,China)

机构地区：[1]东华大学材料科学与工程学院,纤维材料改性国家重点实验室,上海201620 [2]成都飞机设计研究所,成都610091

出　　处：《复合材料学报》2023年第10期5641-5653,共13页Acta Materiae Compositae Sinica

基　　金：中央高校基本科研业务费专项资金(2232022 A-12)。

摘　　要：采用两种不同熔体黏度的国产高性能聚芳醚酮树脂(PAEK-L、PAEK-H)及国产T300级碳纤维(SCF35),制备了碳纤维增强聚芳醚酮(SCF35/PAEK)热塑性复合材料,研究了树脂基体黏度及冲击能量对复合材料冲击性能的影响,采用Micro-CT表征了准静态压入试样的内部形貌,研究了复合材料的冲击损伤机制。结果显示流动性较低的PAEK-L树脂基复合材料比流动性较高的PAEK-H树脂基复合材料具有更高的抗冲击性能,SCF35/PAEK-L复合材料体系冲击能量的损耗比SCF35/PAEK-H复合材料体系低~7%,其损伤面积小~90%,在6.67 J/mm的冲击能量下,其冲击后压缩强度达到~307 MPa,比SCF35/PAEK-H复合材料体系冲击后压缩强度(205 MPa)高~50%;SCF35/PAEK-L复合材料中表面凹坑的深度随冲击能量的增加呈增加的趋势,冲击后压缩强度随冲击能量的增加呈降低的趋势,当复合材料的表面凹坑深度达到1.0 mm左右,即达到勉强目视可见冲击损伤(BVID)门槛值时,剩余压缩强度为~268 MPa。准静态压入实验结果显示,SCF35/PAEK-L复合材料受到冲击后表面凹坑主要由树脂基体的塑性变形及纤维屈曲造成,表面凹坑周围的裂纹由压缩应力造成,冲击过程中试样背面的纤维在拉伸应力的作用下发生断裂,试样底层的纤维在剪切力的作用下萌生层间裂纹,随着试样挠曲变形程度的增加,纤维的断裂程度增加且层间裂纹逐渐扩展。Carbon fiber reinforced poly aryl ether ketone(SCF35/PAEK)thermoplastic composites were prepared using two different melt viscosities of domestic high performance poly aryl ether ketone resins(PAEK-L and PAEKH)and domestic T300 grade carbon fibers(SCF35),and the effects of resin matrix viscosity and impact energy and impact energy on the impact properties of the composites were investigated.In addition,the internal morphology of quasi-static indentation specimens was characterized by Micro-CT to study the impact damage mechanism of the composites.The results show that PAEK-L resin matrix composite with lower fluidity has higher impact resistance than PAEK-H resin matrix composite with higher fluidity.The impact energy loss of the SCF35/PAEK-L composite system is~7%lower than that of the SCF35/PAEK-H composite system,its damage area is~90%smaller,and its compression strength after impact reaches~307 MPa at an impact energy of 6.67 J/mm,which is~50%higher than that of SCF35/PAEK-H composite system(205 MPa).The depth of surface dent in SCF35/PAEK-L composites tends to increase with the increase of impact energy,and the compression strength after impact tends to decrease with the increase of impact energy,and the compression strength after impact is~268 MPa when the depth of surface dent of the composites reaches about 1.0 mm,i.e.,when the threshold value of barely visible impact damage(BVID)is reached.In addition,the results of quasi-static indentation tests show that the surface dent of SCF35/PAEK-L composite after impact is mainly caused by plastic deformation of the resin matrix and fiber flexure,the cracks around the surface dent are caused by compressive stress,the fiber on the back side of the specimen is fractured under the action of tensile stress during the impact process,the fiber on the bottom layer of the specimen sprouts interlayer cracks under the action of shear force,with the increase of flexural deformation of the specimen,the degree of fiber fracture increases and the interlayer cracks gradually ex

关 键 词：聚芳醚酮(PAEK) 热塑性复合材料 低速冲击 勉强目视可见冲击损伤(BVID) 冲击后压缩 

分 类 号：TB332[一般工业技术—材料科学与工程]