Adhesion test for metallic coatings by shot peening

2015 ◽  
Keyword(s):  
Shot Peening ◽  
Metallic Coatings ◽  
Adhesion Test

scholarly journals Repeated Laser Shock-Wave Adhesion Test for Metallic Coatings: Adhesion Durability and Its Mechanism Studied by Molecular Dynamics Simulation

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 291
Author(s):  
Kohei Kanamori ◽  
Shuto Toriumi ◽  
Yoshikatsu Kimoto ◽  
Akio Yonezu
Keyword(s):  
Shock Wave ◽  
Molecular Dynamics ◽  
Cyclic Loading ◽  
Crack Initiation ◽  
Dynamics Simulation ◽  
Zone Model ◽  
Laser Shock ◽  
Metallic Coatings ◽  
Adhesion Test ◽  
Laser Shock Wave

We evaluated the adhesion of polycrystalline metallic coatings using the laser shock-wave adhesion test (LaSAT). This study used Cu plating on stainless steel as a coating model. The adhesion strength and toughness were successfully estimated using LaSAT and finite element method with cohesive zone model. Next, repeated LaSAT was conducted to apply cyclic loading to evaluate adhesion fatigue life, i.e., the number of loading cycles required for delamination. Furthermore, this study performed molecular dynamics (MD) simulations to elucidate the adhesion mechanism for the Cu/Fe interface. To verify our model, the interfacial fracture toughness was computed using the MD simulation and compared with the results of LaSAT. Next, cyclic loading was applied to the MD model to investigate crack initiation around the interface. We found that dislocations are generated from the internal grain and are accumulated at grain boundaries. This accumulation results in fatigue crack initiation due to stress concentration.

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