Simulation of back-pressure multi-directional compression deformation behavior of N36 zirconium alloy
The back-pressure multi-directional compression deformation behaviors of N36 zirconium alloy with different back-pressures and back-pressure distances were studied by finite element simulation method to analyze the effect laws of back-pressure effect on rheologi-cal process and damage behaviors of the metal.The results show that the four deformation areas can be produced by single compression.The difference of metal deformation history causes the uneven accumulation of equivalent strain for specimens after one pass back-pressure multi-directional compression deformation.The application of back-pressure can increase the cumulative strain of the specimens and the volume proportion of large deformation area,improve the insufficient deformation in small deformation area,and increase the deformation uniformity of specimens.At the same time,increasing the back-pressure and decreasing the back-pressure distance can increase the cumu-lative strain,improve the strain uniformity,reduce the thickness of the damaged layer and decrease the volume proportion of the damagd area.When the back-pressure is 100 kN and the back-pressure distance is 5 mm,the cumulative strain of the specimen increases to 4.05,the volume proportion of the large deformation area increases to 0.87,and the thickness of the damaged layer of the specimen and the volume proportion of damaged area are 2.74 mm and 2％,respectively.Compared with the condition without back-pressure,the de-formation uniformity of the specimen is significantly improved,the thickness of the damaged layer is significantly reduced,and the materi-al utilisation rate is fully improved.
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