各向同性热解石墨的纳米压痕试验与有限元仿真研究

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The load-displacement curves ofisatropic pyrolytic graphite were obtained through nanoin- dentation experiment.According to the theory of olive and pharr the hardness and the young modulus were calculated to obtain performance of main materials.Then a numerical model for the nanoindentation experiment was set up by finite element method.Through comparing the load-displacement curve fitted by finite element with the actual curve obtained from nanoindentation experiment,relative correlation was achieved.Finally plastic property of isotrapic pyrolytic graphite was got,which prove the feasibility of finite element simulation at the same time.通过对各向同性热解石墨进行了纳米压痕试验，得到了其材料的载荷―位移曲线。并根据Olive和Pharr理论算出了其硬度与弹性模量值，得到了主要的材料性能。在纳米压痕试验的基础上，通过有限元单元法建立了纳米压痕试验的数值模型，通过比较有限元所拟合的载荷一位移曲线和实际纳米压痕试验所得到的曲线，进行相应的修正，最后得到了该材料的塑性性能，也证明了有限元仿真的可行性。