摘要
通过对中心开孔、双边半圆切口和双边V型切口三种结构的静态拉伸测试及有限元模拟分析,比较了不同开孔/切口形式C/C编织复合材料的破坏行为。结果表明:三种开孔/切口形式的C/C试件在拉伸破坏中均表现为较强线性的应力-应变关系,且开孔/切口附近有明显的应力集中;板宽不变时,缺口强度对开孔/切口尺寸不敏感,而对其端部的曲率半径较敏感;孔端部材料不满足线弹性的破坏机制,发生了大规模的应力松弛,其尺寸随开孔/切口曲率半径的增大而增大,而对开孔/切口位置不敏感。
The tensile fracture of the 3D C/C braided composite structures was studied through the static tensile test and finite element simulation analysis. Three modeling structures including circularly holed, double-edge semicircle and double-edge-V-shaped specimens were considered for the investigation. The results show that the three open structures in the tensile failure have a strong linear stress - strain relationship and locality stress concentration. At the fixing width of the C/C specimens, the tensile notched strength is not sensitive to size, but it is sensitive to the radius of the notch-tips. The linear elastic failure mechanism can not be applied to the damaged zone of the material, which suggest that a large-scale stress relaxation should exist. The size of the damaged zone increases when the radius of the notch-tips increases, while the size is insensitive to the location of the openings.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2013年第3期87-92,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(11272105)
高等学校博士学科专项科研基金(20092302110006)
关键词
C/C复合材料
缺口强度
3D编织
拉伸破坏
强度分析
carbon/carbon composites
notched strength
3D braided
tensile fracture
strength analysis
