earticle

영어

At winter the problem that how to efficiently clear solid ice and snow, which always plagues the staff .The interfacial materials—solid snow-ice— cause the major operational problem related to snow removed performance. The central issue is how to evaluate the yield characteristics when the solid snow-ice was broken and fracture failure. Measurement system of freezing adhesive yield characteristics was established and solid snow-ice freezing adhesive yield characteristics were tested. From the experiment process that simulating snow-ice repeatedly compacted by vehicles on practical road, the total strain ε of solid snow-ice under the effect of cyclic load is the sum of pure elastic strain εe, delayed elastic strain εd and permanent strain εv. The total strain ε was measured by the DH3818 strain gages, according to the strain curve, the strain showed as fluctuated change along with the load applied, the strain value changed as a process of increase-decrease-increase. The rotating orthogonal test was conducted by using the average of single group strain as objective function, thickness of snow layer, snow-ice density and snow-ice firmness are as influencing factors. Through the test result, the major and minor relation of three factors are thickness of snow layer>snow-ice density>snow-ice firmness, and the thickness of snow layer has the interaction with density and firmness. From the analysis, the optimal average strain is 0.128 to 0.14 which can be got by the fellow parameter combination: the range of snow density is 500kg/m3-518kg/m3, the range of thickness of snow layer is 6.9mm-7.5mm, the range of snow firmness is 1826Pa-2040Pa. Through the study, the constitutive model of solid snow-ice can be established, meanwhile, the certain theoretical basis for efficient solid snow-ice clearing has been provided.