TY - GEN
T1 - Metal surface fatigue detection using nonlinear ultrasonic
AU - Yan, Hong Juan
AU - Xu, Chun Guang
AU - Lin, Qi
AU - Cai, Hai Chao
PY - 2014
Y1 - 2014
N2 - Based on theory of ultrasonic nondestructive testing on surface fatigue damage of metal components, the wave law of ultrasonic nonlinearity caused by fatigue is studied. When there are lattice defects in metal material, second-order nonlinear coefficient β changes during ultrasonic propagation. According to the point, the system of nonlinear ultrasonic testing is build. The change trends of harmonic amplitudes and ultrasonic coefficients are measured during fatigue bending testing of materials such as 45 steel, 2024 aluminum alloy and 304 stainless steel. The results shows: in elastic phase, the ratios of harmonic and fundamental waves monotonically increase with fatigue life, and in plastic phase, deformations appear and micro-cracks expand into macro-cracks in materials, the ratios firstly decrease and then increase with fatigue life. However the quadratic sums of nonlinear coefficient are approximately linear with the fatigue life. Therefore, when the relationship between the quadratic sums and fatigue life is known, it can be used to characterize fatigue state of metal materials.
AB - Based on theory of ultrasonic nondestructive testing on surface fatigue damage of metal components, the wave law of ultrasonic nonlinearity caused by fatigue is studied. When there are lattice defects in metal material, second-order nonlinear coefficient β changes during ultrasonic propagation. According to the point, the system of nonlinear ultrasonic testing is build. The change trends of harmonic amplitudes and ultrasonic coefficients are measured during fatigue bending testing of materials such as 45 steel, 2024 aluminum alloy and 304 stainless steel. The results shows: in elastic phase, the ratios of harmonic and fundamental waves monotonically increase with fatigue life, and in plastic phase, deformations appear and micro-cracks expand into macro-cracks in materials, the ratios firstly decrease and then increase with fatigue life. However the quadratic sums of nonlinear coefficient are approximately linear with the fatigue life. Therefore, when the relationship between the quadratic sums and fatigue life is known, it can be used to characterize fatigue state of metal materials.
KW - Fatigue damage
KW - Harmonic amplitude
KW - Metal material
KW - Ultrasonic nonlinear coefficient
UR - http://www.scopus.com/inward/record.url?scp=84894568884&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMM.510.156
DO - 10.4028/www.scientific.net/AMM.510.156
M3 - Conference contribution
AN - SCOPUS:84894568884
SN - 9783038350187
T3 - Applied Mechanics and Materials
SP - 156
EP - 162
BT - Materials Engineering for Advanced Technologies (ICMEAT 2013)
T2 - 2013 3rd International Conference on Materials Engineering for Advanced Technologies, ICMEAT 2013
Y2 - 31 December 2013 through 2 January 2014
ER -