Zhiwu Han, Junqiu Zhang, Chao Ge, You Lv, Jialian Jiang, Luquan Ren Key Laboratory of Bionic Engineering (Jilin University), Ministry of Education, P.R.China
Material failure is usually caused by corrosion, wear and mechanical damage. According to previous researches, erosion wear holds about 8% of regular wear in industrial production. In the present work, a new approach which adopted the idea of coupling bionics to improve erosion resistance of machine parts was presented, and the desert scorpion ( Leiurus quinquestriatus ) was taken as the research object. The anti-erosion characteristic rules and mechanism of desert scorpion's surface under the dynamics effect of gas/solid mixed media were researched, especially the comprehensive influence mechanism of surface morphology, microstructure, creature flexibility and many other factors were studied. Simulation by ANSYS/LS-DYNA finite element software was applied to predict the relative erosion severity, and experiment optimum design theory was employed to design experiment scheme. Silica sand of particle size 105~830 μm was used as the erodent. Samples with the coupled bionic configurations of groove and flexibility were produced. The erosion tests were carried out to validate the simulation results obtained. It is shown that the predicted results are in agreement with those obtained from the experiments. Regression equation between erosion rate and experiment factors of coupling of flexibility and surface morphology were obtained. And contrast tests were carried out at the best and worst test points of erosion resistance for three samples of groove, smooth and flexibility, smooth. Contrast tests showed that the erosion resistance trend occurred in such order with the best erosion resistance as coupling sample, the second was smooth and flexibility, the third was groove, the fourth was smooth, and the increasing rate of erosion resistance in sequence of 32.8%, 28.86%, 16.03% in the best test point. But in the poorest point, the erosion resistance trend occurred in such order with the best erosion resistance as coupling sample, the second was groove, the third was smooth and flexibility, the fourth was smooth, and the increasing rate of erosion resistance in sequence of 35.74%, 25.53%, 5.59%, respectively. The morphologies of eroded surface were examined by the Scanning Electron Microscope (SEM), and the possible wear mechanism was discussed.
Erosion, Coupling bionics, ANSYS/LS-DYNA, Experiment optimum design
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