摘要
通过三点弯曲试验研究了Z-pin材质、直径和加捻状态对Z-pin增强复合材料层合板弯曲性能的影响。结果表明相较于未增强对照组试件,碳纤维Z-pin增强组试件的弯曲强度、模量分别提升了20.28%与27.55%,且其提升效果要优于聚酰亚胺纤维Z-pin;小直径Z-pin组试件的弯曲强度、模量分别提升了19.96%与29.32%,且其提升效果要优于大直径Z-pin;Z-pin加捻与否对试件弯曲强度、模量的影响甚微,这与其失效形式有关。Z-pin植入试件后能大幅度提高试件的弯曲应变能,试验中相较于对照组试件,Z-pin增强组试件弯曲应变能的提升范围为15.23%~112.23%。其中,大直径Z-pin的提升效果最为显著,提升比率在110%以上。此外,Z-pin的植入会提高试件抵抗变形损伤的阻力,使试件表现出更大的失效位移,但弯曲应变能低的试件不易形成稳定的损伤扩展。
This essay presents knowledge that the effect of material,diameter and twisting state of Z-pin on the flexural performance of Z-pin reinforced composite laminates,which was studied through three-point bending test.The results show that the flexural strength and modulus of the carbon fiber Z-pin group specimens have been in-creased by 20.28%and 27.55%,respectively,compared with the blank groups without Z-pin,and the improve-ment effect is better than that of the polyimide fiber Z-pin group.The flexural strength and modulus of small diame-ter Z-pin group specimens have been increased by 19.96%and 29.32%,respectively,compared with the blank groups without Z-pin,and the boost effect is better than that of the large-diameter Z-pin group.While the twisted state of Z-pin has little effect on the flexural performance,which is related to the mixed failure mode combined pull-out with shear failure.After Z-pin is implanted into the test piece,it significantly improves the flexural strain energy of the test piece.In the test,the flexural strain energy of Z-pin reinforced specimens increased by 15.23%~112.23%compared with the blank groups without Z-pin.Among them,the effect of large diameter Z-pin is the most signifi-cant,and the lifting ratio is more than 110%.In addition,Z-pin implantation can increase the resistance of specimens to deformation damage,and make the specimens show greater failure displacement.But,the specimens with low flexural strain energy are not easy to form stable damage propagation.
作者
严斌
陈巍
马承燕
滕薛蓓
刘维伟
李向前
YAN Bin;CHEN Wei;MA Cheng-yan;TENG Xue-bei;LIU Wei-wei;LI Xiang-qian(School of Mechanical Engineering,Northwestern Polytechnical University,Xi′an 710072,China;AECC Shanghai Commercial Aviation Engine Manufacturing Co.,Ltd.,Shanghai 200241,China)
出处
《复合材料科学与工程》
CAS
北大核心
2021年第3期88-93,共6页
Composites Science and Engineering
基金
中航工业商发改善铺层复材面内性能的Z-pin植入方式研究项目资助(2018MC050079)。
