含开孔三维编织复合材料的疲劳行为

Fatigue Behavior of 3D Braided Composites Containing an Open-Hole.

作者信息

Liang Shuangqiang, Zhou Qihong, Mei Haiyang, Chen Ge, Ko Frank

机构信息

Department of Mechanical Engineering, Donghua University, Shanghai 200051, China.

Department of Material Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.

出版信息

Polymers (Basel). 2020 Sep 21;12(9):2147. doi: 10.3390/polym12092147.

DOI:10.3390/polym12092147

PMID:32967129

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7569842/

Abstract

The static and dynamic mechanical performances of notched and un-notched 3D braided composites were studied. The effect of longitudinal laid-in yarn was investigated in comparison with low braiding angle composites. The specimens were fatigue tested for up to millions of cycles, and the residual strength of the samples that survived millions of cycles was tested. The cross-section of the 3D braided specimens was observed after fatigue loading. It was found that the static and fatigue properties of low angle 3D braided behaved better than longitudinally reinforced 3D braided composites. For failure behavior, pure braids contain damage better and show less damage area than the braids with longitudinal yarns under fatigue loading. More cracks occurred in the 3D braided specimen with axial yarn cross-section along the longitudinal and transverse direction.

摘要

研究了带缺口和无缺口三维编织复合材料的静态和动态力学性能。与低编织角复合材料相比，研究了纵向嵌入纱线的影响。对试样进行了长达数百万次循环的疲劳试验，并测试了经受数百万次循环后幸存试样的残余强度。在疲劳加载后观察三维编织试样的横截面。结果发现，低角度三维编织复合材料的静态和疲劳性能优于纵向增强三维编织复合材料。对于失效行为，在疲劳载荷作用下，纯编织物比带有纵向纱线的编织物能更好地容纳损伤，且损伤面积更小。在具有轴向纱线横截面的三维编织试样中，沿纵向和横向出现了更多裂纹。