Comparative study of predictive FE methods for mechanical properties of nuclear composites
Comparative study of predictive FE methods for mechanical properties of nuclear composites
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DOI：
10.1016/j.jnucmat.2008.09.020
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发表时间：
2009
影响因子：
3.1
通讯作者：
Joshim Ali;J. Farooqi;D. Buckthorpe;A. Cheyne;P. Mummery
中科院分区：
文献类型：
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作者：
Joshim Ali;J. Farooqi;D. Buckthorpe;A. Cheyne;P. Mummery
碳纤维增强碳 (C/C) 复合材料是实验聚变反应堆中面对等离子体的组件的候选材料，例如：ITER； JT-60——托卡马克聚变测试设施（JAEA）；以及下一代裂变反应堆的控制棒。因此，确定它们在辐照下的热机械性能对于未来反应堆的安全设计和运行至关重要。与昂贵且耗时的传统实验验证相比，开发能够预测此类材料行为的可靠模型具有巨大优势。这里使用三维有限元 (FE) 方法来预测两种编织 C/C 复合材料的杨氏模量，并进行拉伸测试进行验证。应力分布结果表明，与单位单元方法相比，基于图像的新型有限元网格路径与实验数据更加一致。当精细微观结构细节从 X 射线断层扫描数据转换而来时，基于图像的方法可捕获真实的孔隙率。相比之下，晶胞模型代表了忽略孔隙率的复合结构的理想化。
Carbon fiber reinforced carbon (C/C) composites are candidate materials for plasma facing components in experimental fusion reactors such as: the ITER; the JT-60 – a Tokamak fusion test facility (JAEA); and for control rods in the next generation fission reactors. Therefore, determining their thermo-mechanical properties under irradiation is essential for safe design-cum-operation of future reactors. Development of reliable models which can predict such materials’ behavior is of massive advantage against the conventional experimental verification which is hugely expensive and time-consuming. Three-dimensional finite element (FE) methods are used here for predicting Young’s modulus of two woven C/C composites where tensile tests are performed for validation. Stress distribution results indicate that a novel image-based route for FE meshes compared to a unit cell approach gives stronger agreement with experimental data. The image-based approach captures true porosity as fine microstructural details are converted from X-ray tomographic data. In comparison, the unit cell model represents idealizations of composite architecture that ignores porosities.