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利用数值模拟结合正交试验设计方法,研究不同刀具楔角、耕作深度和土壤-耕具间摩擦因数对切削阻力的影响,及切削过程中土壤裂纹的扩展形态。模拟结果表明:当楔角一定时,随着耕深和摩擦因数的增加,裂纹长度随之增加且趋于平缓;当楔角和耕深不变,摩擦因数不同时,裂纹形态的扩展趋势不同;当楔角为20°,耕深为10cm,摩擦因数为0.45时切削力较小;而当楔角为25°,耕深为20cm,摩擦因数为0.70时切削阻力较大。楔角、耕深及土壤-耕具间摩擦因数都是影响耕作过程切削阻力大小的因素,而且因素间的交互影响不可忽视。不同因素水平下土壤切削过程产生的裂纹形态及切削力大小不同。
The influences of different cutter wedge angles, tillage depth and soil-tillage friction factor on cutting resistance and soil crack propagation during cutting were studied by numerical simulation combined with orthogonal experimental design. The simulation results show that when the wedge angle is constant, the crack length increases and tends to be gentle with the increase of tillage and friction coefficient. When the wedge angle and tillage depth are unchanged, the crack growth trends are different when the friction coefficient is different When the wedge angle is 20 °, the tillage depth is 10 cm and the friction coefficient is 0.45, the cutting force is small. When the wedge angle is 25 °, the tillage depth is 20 cm and the friction coefficient is 0.70, the cutting resistance is larger. The wedge angle, tillage depth and soil-tillage friction factor are all the factors affecting the cutting resistance during tillage, and the interaction between factors can not be neglected. The crack shape and cutting force produced by soil cutting process under different factors are different in size.