攻角对聚醚醚酮/泡沫镍双连续复合材料料浆冲蚀行为的影响

The Influence of Impact Angle on Erosion Behavior of PEEK/Ni Foam Co-continuous Composite

聚醚醚酮(PEEK)/泡沫镍双连续复合材料是一种新型复合材料,它是由比强度高的PEEK树脂(基体相)和韧性较高的泡沫镍(增强相)牢固结合而成,具有两相相互连通、拓扑连续和各向同性等特点.使用孔径为100 PPI(每英寸孔隙数目)的泡沫镍与PEEK树脂混合,采用热压成型技术制备了PEEK/泡沫镍双连续复合材料(PEEK-Ni).利用喷射式腐蚀冲蚀试验设备研究了纯PEEK树脂、金属镍和PEEK-Ni在5个攻角下(30°、45°、60°、75°和90°)的料浆冲蚀行为.使用ANSYS Fluent有限元仿真软件对不同攻角下料浆的冲蚀过程进行建模和仿真,并设置了边界条件.试验和仿真的结果均表明:随着攻角增加,冲蚀损伤形貌由月牙形损伤区域变为U型损伤区域,并最终发展成为围绕驻点的环形损伤区域,试验和仿真能相互吻合.由于泡沫镍具有遮挡效应和协同效应,PEEK-Ni比纯PEEK具有更低的冲蚀损伤量,且对攻角不敏感.

Polyether-ether-ether-ketone(PEEK)/Nickel co-continuous composites("PEEK-Ni"for short)is a type of new structure composites.This material is composed of PEEK polymer with high specific strength(matrix phase)and nickel foam with high toughness(reinforcement phase),which has the characteristics of two-phase interconnection,topological continuity and isotropy.Hot pressing technology was used to obtain the PEEK-Ni by infiltrated the melt PEEK polymer into the nickel foam of 100 PPI(pores per inch).The slurry erosion behavior of pure PEEK resin,pure nickel and PEEK-Ni at 5 different impact angles(30°,45°,60°,75°and 90°)was investigated by slurry jet erosion test apparatus.The slurry erosion process with different impact angles was modeled and simulated by using ANSYS Fluent finite element simulation software,and the boundary conditions were set.The results showed that,with the increase of impact angle,the damage area changed from crescent-shaped to U-shaped,and finally it develop into the annular damage area around the stagnation point.The simulation results agreed well with the slurry erosion experiment.Due to the shielding effect and synergistic effect of nickel foam,PEEK-Ni has exhibited lower erosion damage than pure PEEK,and the slurry erosion damage of PEEK-Ni was not sensitive to the impact angle.