U_3Si_2-Al弥散型燃料板微观破坏的数字散斑分析  

Analysis of the failure mechanisms of U_3Si_2-Al dispersion fuel plate using the digital speckle correlation method

作　　者：徐曼琼[1] 徐勇[2] 王哲[1] 金观昌[1] 张之华[3] 

机构地区：[1]清华大学航天航空学院工程力学系,北京100084 [2]清华大学核能与新能源技术研究院,北京100084 [3]中国工程物理研究院核物理与化学研究所,四川621900

出　　处：《清华大学学报（自然科学版）》2007年第2期301-304,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(10376015)

摘　　要：为了对U_3Si_2-Al弥散型复合燃料板破坏的微观机理与演化过程进行深入分析,为其在实际服役失效过程提供一定的参考,采用带加载台的扫描电镜实时观测U_3Si_2-Al弥散型燃料板拉伸与弯曲的变形过程,通过数字散斑相关技术,将不同变形阶段的扫描电镜照片进行相关分析,得到燃料板的位移场分布,进而分析其变形演化过程与微观破坏机理。结果表明,U_3Si_2-Al弥散型复合燃料板的破坏模式主要表现为芯体裂纹的萌生、扩展和失效,芯体与包壳冶金结合性能较好,拉伸及弯曲过程中未出现明显的剪切破坏。The failure of U3Si2-Al fuel plate may be predicted by analyzing the evolution of its microscopic failure mechanisms. Speckle images of U3Si2-Al fuel plates were obtained by in-situ observations with scanning electron microscope （SEM） during tension and flexure tests to analyze the microscopic failure mechanisms. Displacements in the samples were extracted using the digital speckle correlation method （DSCM） during the deformations. The results indicate that the failure mechanisms of U3Si2-Al fuel plates during tension and flexure are crack initiation, propagation, and failure of the fuel layer, without shearing failure between the fuel-cladding sintering interfaces.

关 键 词：工程材料 U3Si2-Al燃料板 数字散斑相关技术 

分 类 号：TB301[一般工业技术—材料科学与工程] O346[理学—固体力学]