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Mechanical characterization of Li_2TiO_3 and Li_4SiO_4 pebble beds: Experimental determination of the material properties and of the pebble bed effective values

机译:Li_2TiO_3和Li_4SiO_4卵石床的机械特性:材料性能和卵石床有效值的实验确定

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This paper deals with a research activity performed in the frame of the breeding blankets design for nuclear fusion reactors, connected with the ITER experiment. In fact during the ITER operation, Test Blanket Modules (TBM) will be tested in the equatorial ports in order to determine their performances.rnThe breeding blankets are presently developed for the DEMO reactor. One of the breeding blanket under study, called Helium Cooled Pebble Bed (HCPB), uses a solid breeder and a solid neutron multiplier in form of pebble beds. Lithium metatitanate (Li_2TiO_3) and lithium orthosilicate (Li_4SiO_4) are considered as the best candidate materials for solid breeder. The analysis of the breeding blanket is complex for the geometry as well as for the loading conditions. Advanced computer codes are needed in order to determine the reliability of the different designs. In this context, the mechanical characterization of pebble beds is important in order to simulate their behaviour. The objective of this research activity is to determine the effective properties of the pebble beds in order to develop a complete constitutive model of the granular material. In particular, with a resonant column device the effective shear modulus and the damping ratio have been determined. Moreover compression tests on single spheres have permitted to obtain the mechanical properties of the materials.
机译:本文涉及与国际热核实验堆实验相关的在核聚变反应堆育种毯设计框架内进行的研究活动。实际上,在国际热核实验堆运行期间,将在赤道港口对测试毯模块(TBM)进行测试以确定其性能。rn目前为DEMO反应堆开发了繁殖毯。一项研究中的育种毯被称为氦冷却卵石床(HCPB),它以卵石床的形式使用固体育种师和固体中子倍增器。偏钛酸锂(Li_2TiO_3)和原硅酸锂(Li_4SiO_4)被认为是固体育种者的最佳候选材料。繁殖毯的分析对于几何形状以及装载条件都是复杂的。需要高级计算机代码才能确定不同设计的可靠性。在这种情况下,卵石床的机械表征对于模拟其性能很重要。这项研究活动的目的是确定卵石床的有效特性,以便开发出颗粒材料的完整本构模型。特别地,对于谐振柱装置,已经确定了有效剪切模量和阻尼比。此外,在单个球体上进行压缩测试已获得材料的机械性能。

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