Simulation of Cracking Patterns in Sprayed Coating under Equi-biaxial Tension.

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  • 等二軸引張りを受ける溶射皮膜の割れ形態のシミュレーション
  • トウ 2ジク ヒッパリ オ ウケル ヨウシャ ヒマク ノ ワレ ケイタイ ノ シミュレーション

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In order to characterize the "Repeating-division type"and "Island-delamination type"cracking patterns which are often observed in brittle coating on a ductile substrate under increasing biaxial tensile stress, computer simulations of the cracking processes were made for cermet or ceramic coating which was thermally sprayed on the substrate of a low carbon steel.The simulation was carried out by using Monte Carlo method and the analytical equations which express the relation among crack size, tensile stress, strain, thickness and material's constants of coating and substrate.In the simulation, many cracks which have been nucleated randomly on the coating grow to either of the above cracking patterns depending on the relative strength of coating and interface.The simulated cracking patterns agree well with those observed in bulge experiments.

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