摘要
为考察2DC/SiC复合材料在外力作用下产生的不可见损伤对其力学性能的影响。通过静压痕实验引入损伤,采用红外热波成像和残余性能测试的方法,表征2DC/SiC复合材料的损伤。结果表明:施加能量为0.75J时,复合材料内部开始产生损伤,施加能量为1.8J(接触力1 700N、压痕深1mm)时,损伤模式发生转变;随着损伤程度的加重,残余压缩强度下降率约为残余拉伸强度下降率的2倍。
In order to examine the mechanical properties of 2D C/SiC composites with invisible damages induced by exter- nal forces, this paper employed thermal imaging testing and residual strength testing to characterize the damage of 2D C/SiC composites induced by quasi-static indentation （QSI）. The results indicated that when the energy applied reached 0.75 J, damage started to occur inside the composites; above 1.8 J （the contact force was above 1 700 N, and the depth reached 1 mm）, the damage mode transformed. With the aggravation of the damage, the decreasing rate of residual compressive strength was nearly 2 times higher than that of the residual tensile strength.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2012年第8期1547-1553,共7页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金青年项目(50902112)
西北工业大学基础研究基金(NPU-FFR-JC201135)~~
关键词
静压痕
施加能量
压痕
损伤阻抗
损伤容限
quasi-static indentation
loaded energy
indentation
damage resistance
damage tolerance
