中文摘要：

对国产石墨材料（NG-CT-01）进行了强度实验研究。考虑石墨材料强度的分散性,对石墨材料不同批次和坯料不同部位、不同方向进行了取样。根据国标实测了材料的抗拉、抗压和抗弯强度。由于在对石墨的应力评价中,压缩应力是以当量拉应力出现的,且石墨安全评价所用数据一般通过抗拉强度实验确定,所以着重对实测数据中的抗拉强度进行了在95%置信水平、99%可靠度的性能指标下的最小强度计算。为了对石墨强度进行安全评价,必须知道石墨强度的威布尔分布。因此应用Weibull＋＋7软件采用极大似然法对抗拉强度实验数据进行了两参数威布尔分布的参数拟合,并按照德国高温气冷堆设计规范《KTA-3232反应堆压力容器内的陶瓷堆内构件》的规定修正了威布尔分布参数,为后续高温气冷堆工程验证提供了基础参数。将实验结果和若干国内外规格的石墨数据进行对比,国产石墨的强度参数在其原基础上有所提高,可基本满足工程验证结构和抗震试验的技术要求,目前已经用于大型石墨堆芯结构抗震试验模型的加工制造。

英文摘要：

The strength of domestic graphite（NG-CT-01） is studied by experiments.Considering the dispersion of graphite material strength,samples are cut with different positions,directions,and blocks.The tensile,compressive,and flexural strength of the material are tested according to the national standards.Compressive stress is based on the equivalent tensile stress that appears in the evaluation of the stress on graphite,and the graphite safety evaluation of the data is determined by the tensile strength of the experiment.Therefore,the minimum strength is given based on the calculation of the tensile strength for the measured data.For graphite strength safety evaluation,the graphite strength Weibull distribution must be known.By using the maximum likelihood method,two-parameter Weibull distribution parameters are fitted with the tensile strength of the experimental data by means of the software of Weibull＋＋7.Experimental data are fitted by two-parameter Weibull distribution.The estimated Weibull parameters are modified by following the German HTGR design specifications KTA-3232 HTR Ceramic Pressure Vessels Internals（1992）.It provides the basis parameters for the future validation static and dynamic experiments for HTR-PM projects.After comparing the experimental results,the conclusion could be drawn out that the graphite strength parameters have been improved based on the original data,and the parameters are able to basically meet the technical requirements for the structural and seismic engineering verification tests.