Layer-directional dynamic compressive mechanical properties of two kinds of densifications 2D-C/SiC
Layer-directional dynamic compressive mechanical properties of two kinds of densifications 2D-C/SiC
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发表时间：
2007
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通讯作者：
Cheng Laifei
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作者：
Cheng Laifei
利用SHPB系统对两种致密化2D-C/SiC材料进行了动态压缩力学性能测试。材料是通过控制CVI工艺参数来制备的。2D-C/SiC应用高应变率的关键是SHPB系统中成形器的几何尺寸设计。动态和静态加载实验结果均取得了成功，表明动态压缩应力-应变曲线清晰。两种致密化2D-C/SiC的力学性能在高应变率下均得到强化，即更高的失效强度、更低的失效应变和更大的剪切损伤角。致密化程度越高，失效强度越高、更低的失效应变和更大的剪切损伤角。离散动态实验数据采用Weibull模数描述，高、低致密化分别为8.36和5.27。从SEM上可以看出，高致密化时发现破裂表面。在高应变率下观察到更多破裂纤维。
The tests for dynamic compressive mechanical properties of two kinds of densifications 2D-C/SiC were performed by using the SHPB system.The materials are made by controlling the parameters of CVI technics.The key issue to apply high strain rates to the 2D-C/SiC is to design the geometrical size of the shaper in the SHPB system.The experimental results of both the dynamic and static loading are successful.They show that the dynamic compressive stress-strain curve is distinctly non-linear.The mechanical properties of the two densifications 2D-C/SiC are both strengthened under high strain rates,which are the higher failure strength,the lower failure strain and the larger shearing damage angle.The higher densification leads to the higher failure strength,lower failure strain and larger shearing damage angle.The dispersive dynamic experimental data are described by Weibull modules,which are 8.36 and 5.27 respectively for high and low densifications.From the SEM,a smooth ruptured surface is found for the high densification.More cracked fibers are observed under high strain rates.