Multiscale monitoring of interface failure of brittle coating/ductile substrate systems:a non-destructive evaluation method combined digital image correlation with acoustic emission
In this paper,we proposed a non-destructive evaluation method combined digital image correlation (DIC) with acoustic emission (AE) techniques,which was used to in-situ monitor interface failure and internal damage of brittle coating/ductile substrate systems under different size scales by bending tests.Measurements of full/local field strain fields by DIC in the segmented coating clearly show typical heterogeneous failure process and successfully clarify several controversial assumptions introduced in theoretical models.AE results effectively reveal the damage evolution of cracking nucleation,propagation and coating spallation of the ceramic coating by combining wavelet transform with traditional parameter analysis under external loads.The conclusions show that there is a good relationship between digital image correlation and acoustic emission signals with the aid of test time during the coating failure,which can be applied to judge cracking formation and coating delamination,and to obtain the most important critical experimental data.As an example,several crucial mechanical properties of a thermal barrier coating system including fracture strength,fracture toughness and shear strength were determined.
Digital image correlation Acoustic emission Brittle coating/ductile substrate Mechanical properties Thermal barrier coating
Weiguo Mao Duojin Wu Wangbin Yao Meng Zhou Yichun Zhou Chunsheng Lu
Key Laboratory of Low Dimensional Materials and Application Technology,Ministry of Education,Xiangta Department of Mechanical Engineering,Curtin University,Western Australia 6845,Australia
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）