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Published:2007,
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任文伟,殷国富,李聪.锆-4合金低周疲劳断口三维能量特征研究[J].工程科学与技术,2007,39(4):94-97.
Study on Feature of 3D Energy in Zircaloy-4’s Propagation. [J]. Advanced Engineering Sciences 39(4):94-97(2007)
中文摘要: 为了定量描述锆-4合金低周疲劳断口的疲劳特性,利用小波变换,研究了断口能量在三维空间的变化特征以及试样状态和加载方向对合金疲劳寿命的影响。结果表明在裂纹扩展期,沿裂纹扩展方向上,能量曲线都具有明显的阶段性;断口表面的形貌随裂纹扩展过程变化较大,在裂纹扩展的初始阶段断口形貌最粗糙,而在扩展期后期则比较平坦、光滑;在与裂纹扩展过程垂直的方向上,裂纹的能量远比周边基体能量大,表明锆-4合金疲劳裂纹的形貌明显比周边区域陡峭。进一步研究还发现,相同加载方向,渗氢试样的能量曲线位于无氢试样的上方,说明氢能改善Zr-4
Abstract:In order to describe quantitatively the fatigue characteristic of the alloy Zr-4’s low-cycle fatigue fracture (Zircaloy-4)
based on wavelet decomposition technology
the change of fracture energy in 3D space and the effect of sample state and loading direction to fatigue life were studied. The obvious stages of energy curve were discovered along the crack expanding direction in the propagation zone. There were large changes in the 3D appearance of fatigue fracture along the crack expanding direction. The most roughness segment is in the primary stage
and then the 3D appearance of fatigue fracture was becoming smoother. The energy of crack was far larger than that of the ambient body in vertical direction of the crack propagation. It was showed that the 3D appearance of crack is steeper than that of ambient areas. The energy curve of hydrogenation is above the curve of hydrogen free in the same loading direction. Therefore
hydrogen can improve the fatigue characteristic of Zircaloy-4. According to energy curve
low cycle fatigue life of R sample is larger than that of T sample. However
the result of experiment isn’t coincident. It showed that there is a definite localization to differentiate the fracture life only using energy curve.
锆-4合金能量曲线渗氢加载方向
Zircaloy-4energy curvehydrogenationloading direction
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