W111003 粒子衝突摩耗進行過程のシミュレーション([W11100](機素潤滑設計部門企画),***ージョン現象とその応用技術の新展開)

概要

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A new type of solid particle impact test, which is called Micro-Slurry-jet Erosion (MSE) test, is proposed recently. MSE test can evaluate the wear properties of thin, single layered or multilayered physical vapor deposited (PVD) coatings. In the MSE test, a slurry containing 1.2m alumina particles was impacted at high velocity about 100m/s perpendicular to thin PVD coatings. But MSE test needs to choose both of the impact velocity and the impact angle from the information about the grain size of alumina particle, or thickness and mechanical properties of hard coating , to obtain the optimum wear rate. The Discrete Element Method (DEM) is a numerical method used to compute the movements of particle in the slurry jet or fracture of brittle specimen consisted of a large number of particles such as grain architecture in the hard coating. This paper explores for the impactive fracture simulation, i.e. the crack initiation and propagation in thin hard coating, caused by the attack of slurry jet using the DEM model. A mathematical model taking into account adhesion, abrasion and impact wear which occur between the alumina particle in slurry and the thin hard coating is derived in order to predict the loss of material on coating. Our DEM simulated predictions are compared to published experimental data.
一般社団法人日本機械学会の論文
2011-09-11