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RESEARCH ON HCF TESTS AND DAMAGE MODEL OF TC11 ALLOY WELDED JOINTS

机译：TC11合金焊接接头HCF测试及损伤模型研究

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In the paper, the loading controlled fatigue tests of TC11 alloy welded joints had been done, micro characteristic of fatigue fracture surface had been studied by SEM (scan electron microscope) as well. Test results revealed that two types of fatigue source on fracture surface of the welded joints were found, say, surface fatigue source and internal fatigue source. Then S-N curve about two types were obtained respectively. The fatigue life of the welded joints which have surface fatigue source are 35-65% as long as of that have internal fatigue source. Moreover, the fractal dimension of fatigue source rejoin on fracture surface had been calculated, which based on the grayscale distribution of the fracture surface's SEM imagines. The relationship between fractal dimension and fatigue life were surveyed. Finally, a fractal damage model which concern with macro and micro damage was established based on the combination of damage mechanics theory and geometry fractal theory.
机译：本文完成了TC11合金焊接接头的载荷控制疲劳试验，并通过扫描电镜（SEM）研究了疲劳断裂表面的微观特性。测试结果表明，在焊接接头断裂面上发现了两种疲劳源，即表面疲劳源和内部疲劳源。然后分别得到关于两种类型的S-N曲线。具有表面疲劳源的焊接接头的疲劳寿命只要具有内部疲劳源的焊接接头的疲劳寿命为35-65％。此外，还基于断面SEM图像的灰度分布，计算了疲劳源在断面上再结合的分形维数。研究了分形维数与疲劳寿命之间的关系。最后，结合损伤力学理论和几何分形理论，建立了涉及宏观和微观损伤的分形损伤模型。

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