Abstract
The contact fracture property and mechanism of electroplated Ni-P coating on stainless steel substrate were investigated using ball indentation testing, through a comprehensive experimental and numerical approach. First, the elastoplastic properties of both coating and substrate were evaluated using micro-indentation tests. Next, ball indentation test with large contact force was performed, such that the brittle coating on ductile substrate suffers from cracks, including ring crack (propagates circumferentially) and radial cracks (propagates radially), owing to the coating bending effect. The fracture nucleation process was investigated using the acoustic emission technique (AET). In addition, finite element method (FEM) with cohesive zone model (CZM) was carried out to compute stress field and simulate crack initiation around the impression during the test. By using the comprehensive experimental/computational framework, the nucleation process (mechanism) of such a complicate crack system was clarified. The present technique and fracture mechanism may be applicable to the analysis of structural integrity of other brittle coatings. © 2012 Elsevier B.V.
| Original language | English |
|---|---|
| Pages (from-to) | 184-192 |
| Number of pages | 8 |
| Journal | Materials Science and Engineering: A |
| Volume | 563 |
| DOIs | |
| Publication status | Published - 2013 |
| Externally published | Yes |
Funding
The work of A.Y. is supported in part of Grant-in-Aid for Young Scientist of (B) (No. 22760077) of the Ministry of Education, Culture, Sports, Science and Technology , Japan, and Research Grant for Science and Technology of SUZUKI Foundation. The work of X.C. is supported by the National Natural Science Foundation of China (11172231), the World Class University program through the National Research Foundation of Korea (R32-2008-000-20042-0), and the National Science Foundation (CMMI-0643726)
Keywords
- Ball indentation
- Contact fracture
- Electroplated Ni-P coating