An improved contact model considering the effect of both pressure and friction for wear prediction of blade surface in wet-adhesive soil

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Abstract

To accurately predict wear locations on the rotary tillage blade surfaces operating in wet-adhesive soil, a novel discrete element modeling method of rotary tillage blade is first proposed, and an improved contact model incorporating the wear effects between wet-adhesive soil and blades is developed in this work. Model parameters are calibrated using direct shear and penetration tests, and a discrete element interaction model of the wet-adhesive soil-blade coupled system is established. The proposed model is then employed to investigate the effects of the blade shaft orientation, shaft speed and cutting-edge angle on the wear and tillage performance, evaluated through surface pressure and friction force.

Additionally, the corresponding model verification tests and blade wear tests are conducted. The results show that the relative error of the blade shaft torque between the simulated value and the experimental value is 3.9%, and the simulated results align closely with the actual wear position on the blade surface. Wear is most pronounced on the front cutting edge, particularly under the forward rotation condition. Furthermore, increasing the cutting-edge angle of the blade from 60° to 120° leads to a 106.5% rise in cumulative pressure on the front cutting edge, indicating that the cutting-edge angle is a key factor influencing blade wear.

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