Delayed Hydride Cracking (DHC) tests are conducted by using CT specimens of Zr-2.5Nb at 250 ℃. The test data is inputed for the FEM model. Two models is made according to the application of the hydride expansion. Hydride stresses and average stresse...
Delayed Hydride Cracking (DHC) tests are conducted by using CT specimens of Zr-2.5Nb at 250 ℃. The test data is inputed for the FEM model. Two models is made according to the application of the hydride expansion. Hydride stresses and average stresses of the plastic zone of two FEM models are calculated and two results are compared. That results say that hydride fracture is due to the hydride expansion and say that hydride fracture is related to the relation between the increment of the hydride expansion stress and the increment of the average stress of the plastic zone on the hydride. Also, that results say that the hydride expansion is most important factor of DHC. Now, Stage Ⅰ and Stage Ⅱ of the unique DHC phenomenon can be explained through an analysis of the increment of the hydride expansion and the plastic constraint force in the plastic zone.