Analysis On Structural Integrity Of Round-link Chain With Flaws

It is widely used in mining equipment that round-link chain transmission with simple,reliable operation, large traction, long operating life and other characteristics. With theincreasing of coal production in recent years, the fracture accident of round-link chain in thescraper conveyor frequently occur, which have become one of the main hidden danger insafety production of coal mine. Therefore, an analysis on high intensity round-link chain withsurface cracks was simulated by using ABAQUS software in this dissertation.Main research contents in this study are as follows. The finite element model of linkchains was respectively established in straight region and corner region. The sub-modelsincluding welding joint position, the top, the shoulder of chain were respectively establishedbased on the positions of the surface cracks. The stress intensity factor KIand J integral alongcrack fronts were adopted by using a global model of chain without flaws and severalsub-model of chain with surface cracks, and the effect of the crack location and crack depthon KIand J integral were analyzed by ABAQUS software in this dissertation.The results of this investigating show that the chain with surface crack tends to be moredangerous with the crack depth increasing when the surface crack located at most position ofchain, but this situation will be changed when the chain with surface crack at top position ofchain. It is the most dangerous when the surface crack locate at the welded joints and the topof chain in straight region, and it is the most dangerous when the surface crack locate at theshoulder of chain in corner region. The results provide a theoretical basis for the structural integrity assessment of round-link chain with surface cracks.