Using nonlinear ultrasonic test for fatigue damage of LY12 aluminum alloy

作者：Yan Bing Sheng^*; Zhang Shi Xiong

来源：Journal of Aeronautical Materials, 2012, 32(2): 93-98.

DOI：10.3969/j.issn.1005-5053.2012.02.017

• Dislocation densities
• Experimental procedure
• Fatigue cycles
• LY12 aluminum
• LY12 aluminum alloy
• Macro-mechanics
• Metallic material
• Micro and macro
• Microscopic observations
• Non-linearity parameter
• Nonlinear ultrasonic

For the problem of the LY12 aluminum early fatigue damage, a robust experimental procedure was researched. Using this system, the ultrasonic nonlinearity parameters of LY12 aluminum fatigue samples were measured. The experimental results show that there is a significant increase in β linked to aluminum fatigue damage, before the fatigue life of 60%. Meanwhile, dislocation density change of LY12 aluminum fatigue samples is observed using erosion method, and the changes of nonlinearity parameter and dislocation density with fatigue cycles are consistent. Macro-mechanics, nonlinear ultrasonic testing and microscopic observation results show that ultrasonic nonlinearity parameters as the bridge between micro and macro can characterize the early fatigue damage, and predict fatigue life of metallic material.

• 出版日期2012
• 单位河南大学