The Study On The Impact Property Of High-Tensil Steel Chains For Mining Under The Temperature-Corrosion Coupling Effect

The environment of underground colliery is a complex coupled system,where high-tensile steel chains,subjected to corrosion of corrosive medium and impact load,for mining,are used.The research on shock property of chains,under different coupling conditions of temperature and corrosion,hence,is of great significance in theory and practical value in engineering to analyzing mechanism of deterioration of structure properties of chain drive and evaluating the service life of the system,such as scraper conveyers,slicers and so on,in a long running process.Based on the analysis of corrosion environment in underground coal mine and the latest study of etch-pit morphology,the geometric model of chain's etch pit was simplified.The impact performance of chain on different simulated conditions,such as at different temperatures,under different corrosion conditions,and under different coupling conditions of temperature-corrosion,was studied by means of ABAQUS,a kind of finite element analysis software.And the fitting formulas of the parameters of chains during the impact process,temperature and corrosion state—corrosion depth,corrosion area and corrosion density—laying the foundation for the design and optimization of mining ring chain,were established by the aid of the MATLAB curve/surface fitting toolbox.The overall changing trend of the shock parameters of chains,the study shows that,is irrelevant to temperature,corrosion and temperature-corrosion.Without regard for corrosion,it suggests that,there are linear relationships between the maximum steady equivalent stress and the temperature,between the plastic dissipative energy and the temperature,between the internal energy and the temperature during the impact process,and the stress decreases as the temperature increases,and the plastic dissipative energy and the internal energy of chain increase as the temperature increases.In the heavy-load start-up process,it indicates that,at 20 ?,the relationships of the stress/the friction dissipating energy/the internal energy and corrosion depth/radius/density is started with a cubic function.Chain links,whose corrosion position is located in III zone,are more prone to fatigue damage,because,at the same temperature and corrosion,the maximum steady stress of chain in ? zone is apparently higher and the areas of the chain's yield state is obviously greater than in ? and ?.