摘要
用波形整形器改装后的SHPB装置测试先驱体法制备的二维Cf/SiC复合材料的动态压缩力学性能,得到了在应变率550～2400s-1范围内的动态应力应变曲线。结果表明:使用波形整形器改装SHPB后入射波的形状由矩形变为近三角形;Cf/SiC有明显的应变率效应,其抗压强度随着应变率的增大而增大;根据损伤力学理论,建立了其一维动态本构模型,拟合实验数据确定模型中参数,得到应变率及损伤变量相关的Cf/SiC动态本构关系。
The dynamic compression mechanical properties of2D Cf/SiC composite have been investigated using the Split Hopkinson Pressure Bar （SHPB） improved by pulse shaper, and the dynamic stress-strain curves of Cf/SiC at strain rates from 550 s^- 1 to 2400 s ^- 1 have been obtained. The results indicate that the shape of incident wave changes from rectangle to triangle after using pulse shaper in SHPB testing; Cf/SiC is sensitive to high strain rates, and the dynamic compressive strength of the composite increases with the strain rate increasing. Based on the theory of damage mechanics, a uniaxial dynamic constitutive model is proposed here, and the parameters of this model for the Cf/SiC are obtained by fitting the SHPB test data. It is a strain rate dependent damage modified constitutive relation of Cf/SiC composite.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A01期801-804,共4页
Rare Metal Materials and Engineering
基金
国防重点实验室基金
