高温下核石墨的损伤容限

2019/12/02   下载量： 1 次

方案摘要

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应用领域 能源/新能源
检测样本 核能
检测项目
参考标准 暂无

采用LaVision公司DaVis 8.3.0软件平台上加载的数字全场数字图像相关处理软件模块DVC，对高温下核石墨材料内部的形变，应变以及损伤容限进行了实验测量和分析。

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Nuclear-grade graphite is a critically important high-temperature structural material for current and potentially next generation of fission reactors worldwide. It is imperative to understand its damage-tolerant behaviour and to discern the mechanisms of damage evolution under in-service conditions. Here we perform in situ mechanical testing with synchrotron X-ray computed micro-tomography at temperatures between ambient and 1,000 C on a nuclear-grade Gilsocarbon graphite.We find that both the strength and fracture toughness of this graphite are improved at elevated temperature. Whereas this behaviour is consistent with observations of the closure of microcracks formed parallel to the covalent-sp2-bonded graphene layers at higher temperatures, which accommodate the more than tenfold larger thermal expansion perpendicular to these layers, we attribute the elevation in strength and toughness primarily to changes in the residual stress state at 800–1,000 C, specifically to the reduction in significant levels of residual tensile stresses in the graphite that are ‘frozen-in’ following processing.

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北京欧兰科技发展有限公司
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