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J_C-integral fracture parameter analysis and application for double-layer high-temperature components

机译：双层高温构件J_C积分断裂参数分析及应用

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摘要

A J_C-integral fracture parameter for the safety assessment of components with more complex loadings was given in the paper, and it was carried out with 3D finite element method. Moreover, the cyclone separator of catalytic cracking unit, which is a typical double-layer high-temperature component, was taken as the practical application case. From the test results, it can be concluded that the high temperature fracture toughness J_(IC) of cyclone separator has decreased significantly after long service. In this condition, the J_C-integral can provide us warranty to conclude whether the fracture of cyclone separator will occur under normal loading situation. By comparing the Jc-integral value with the experiment test value J_(IC), the probability of fracture is very small under normal service situation unless there are very long cracks (over 100 mm) in the cyclone separator. Hence the Jc-integral can be regarded as an effective fracture parameter for evaluating the safety of double-layer high-temperature components.
机译：给出了J_C积分断裂参数，用于评估载荷较为复杂的零件的安全性，并通过3D有限元方法进行了评估。另外，作为典型的双层高温成分的催化裂化装置的旋风分离器被作为实际应用例。从测试结果可以得出结论，长期使用后，旋风分离器的高温断裂韧性J_（IC）明显降低。在这种情况下，J_C积分可以为我们提供保证，可以得出在正常加载情况下是否会发生旋风分离器破裂的结论。通过将Jc积分值与实验测试值J_（IC）进行比较，在正常使用情况下，除非旋风分离器中存在非常长的裂纹（超过100毫米），否则破裂的可能性很小。因此，Jc积分可以看作是评估双层高温部件安全性的有效断裂参数。

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