研究了碳布叠层/碳复合材料在四种不同应变率下的压缩性能, 对其在准静态、动态载荷下的压缩破坏机理进行了初步的探讨. 研究结果表明: C/C复合材料的压缩破坏强度具有较强的应变率效应, 与准静态(10-4/s)相比, 复合材料的动态(1.5×102/s)压缩强度可提高70%左右; 复合材料在准静态、动态载荷下力学性能的差异可归结为纤维与基体界面特性的应变率效应以及不同应变率下破坏模式的不同.
To understand the strain rate sensitivity of compressive strength of carbon clothe/carbon (C/C) composites, quasi-static and dynamic compressive experiments were conducted in its x-y plane by means of electric universal test machine and Split Hopkinson Pressure Bar with pulse shapers. The experimental results show that the dynamic compressive fail strength of C/C composites has strong stain rate sensitivity and it increases with strain rate. Compared with the quasi-static compression, the dynamic compressive strength is higher by 70% or so. Meanwhile, the samples are failed by shearing under quasi-static loading, and by crushing under dynamic loading. The different mechanical behaviors from the experimental results indicate that it may be related to the strain rate sensitivity of interfaces characteristic of C/C composites and the change of the failure modes.
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