Status of geometry effects on structural nuclear composite properties

Windes, Will ; Katoh, Y. ; Snead, L.L. ; Lara-Curzio, E. ; C. Henagar, Jr.

Idaho National Laboratory

关键词: Control Elements;    36 - Materials Science;    Irradiation;    Mechanical Properties C/C;    Geometry;   

DOI  :  10.2172/911781
RP-ID  :  INL/EXT-05-00756
RP-ID  :  DE-AC07-99ID-13727
RP-ID  :  911781

美国|英语

来源: UNT Digital Library

【 摘 要 】

structural ceramic composites being considered for control rod applications within the VHTR design. While standard sized (i.e. 150-mm long or longer) test specimens can be used for baseline non-irradiated thermal creep studies, very small, compact, tensile specimens will be required for the irradiated creep studies. Traditionally, it is standard practice to use small, representative test samples in place of full-size components for an irradiated study. However, a real problem exists for scale-up of composite materials. Unlike monolithic materials, these composites are engineered from two distinct materials using complicated infiltration techniques to provide full density and maximum mechanical properties. The material properties may be significantly affected when the component geometry or size is changed. It must be demonstrated that the smaller test samples used in an irradiated study will adequately represent larger composite tubes used for control rod applications. To accomplish this, two different test programs are being implemented to establish that small, flat test specimens are representative of the mechanical response for large, cylindrical composite tubes: a size effect study and a geometry effect study.