Evaluation of Ultrasonic Nonlinear Characteristics in Artificially Aged Al6061-T6

Kim, Jongbeom; Lee, Kyoung-Jun; Jhang, Kyung-Young; Kim, Chung Seok

doi:10.7779/jksnt.2014.34.3.220

Cited by 6 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…are accompanied by obvious nonlinear behavior [5]. In the application of nonlinear theory, scholars have mostly adopted the second-order classic nonlinear coefficient to study the nonlinear phenomenon of sound waves [6,7], which has been supposed to be valid for testing material properties such as degradation, including fatigue [8][9][10], creep [11], thermal aging [12,13] and micro-cracks [14][15][16]. Meanwhile, the second-order nonlinear technology has also been used to evaluate the early damage of the coating.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Damage Process of a Coating by Using Nonlinear Ultrasonic Method

Zhou

et al. 2021

Coatings

View full text Add to dashboard Cite

During the service or external loading of the surface coating, the damage accumulation may develop in the coating or at the interface between the substrate and the coating, but it is difficult to measure directly in the early stage, so the acoustic nonlinear parameters are used as the early damage index of the coating. In this paper, the nonlinear wave motion equation is solved by the perturbation method and the new relationship between the relative ratio of second-order parameter and third-order parameter was derived. The nonlinear ultrasonic testing system is used to detect received signals during tensile testing of for the specimen with Al2O3 coatings. It is found that when the stress is less than 260 MPa, the appearance of the coating has no obvious change, but the nonlinear coefficients measured by the experiment increase with the increase of the tensile stress. By comparing the curves of nonlinear coefficients and stress respectively, the fluctuation of curves the second-order nonlinear coefficient A2 and the relative nonlinear coefficient β′ to stress is relatively small, and close to the linear relationship with the tensile stress, which indicates that the two parameters of the specimen with Al2O3 coatings are more sensitive to the bonding conditions, and can be used as an evaluation method to track the coating damage.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of Damage Process of a Coating by Using Nonlinear Ultrasonic Method

Zhou

et al. 2021

Coatings

View full text Add to dashboard Cite

show abstract

“…Until now, many researchers have focused on the second-order nonlinear parameter b, which has been considered to be effective for inspecting material properties such as degradation, including fatigue [12][13][14][15][16][17], creep [18], thermal aging [19,20] [21][22][23][24][25]. In recent years, however, the third-order nonlinear parameter c, is also becoming a significant indicator in evaluating material degradations.…”

Section: Introductionmentioning

confidence: 99%