The Stress Analysis And Fatigue Life Prediction On Double Telescopic Column Of Hydraulic Support

Column is one of the main bearing structure in hydraulic support, its strength and fatigue life plays a vital role to safety production in coal mine. For hydraulic support column the to improve the service life of the pillar with its working reliability and important meaning.It is of extremely important meaning to proceed stress analysis and fatigue life prediction of hydraulic support's column. Now, the stress analysis and fatigue life prediction of double-telescopic props are proceeded by relying on experience or theoretical calculation, the result accuracy is poor. The stress analysis and fatigue life prediction proceeded by the computer simulation technology can help to reduce development costs, shorten the development cycle and improve reliability level.The failure forms and failure mechanism of double-telescopic props are analyzed through collecting material and put forward that weld fatigue failure is the main failure forms of column. In accordance with the standards MT313-1992 "technology conditions of hydraulic support column", stress of double-telescopic props with 1.5 times axial load and eccentric loads 1.1 times are tested; The entity model and finite element model are built by using UG modeling software and ANSYS finite element analysis software; In the same conditions of loading, the finite element analysis are done; The reliability of finite element analysis are verified by comparing test results and finite element analysis results.The research is preceeded based on the weld structure of double-telescopic props in this paper. Stress analysis are done from two aspects:test and simulation, and to stress analysis results for load process the fatigue life are predicted by using the method of local stress strain gauge. And the influence of weld structure and stress concentration to double-telescopic props strength is considered.Last, on the basic of s-n curve and load spectrum curve, the fatigue life prediction of double-telescopic props with different weld structure are proceeded by using method of local stress strain gauge through ANSYS/FE-SAFE fatigue module to get of fatigue life and safety coefficient on each part of double-telescopic props and compare the influence to fatigue life of double-telescopic props brought by weld groove type and angle to get fatigue life and safety coefficient on each part of column and compare the influence to fatigue life of column brought by weld groove type and angle.The stress and fatigue life of double-telescopic under different weld structure and working condition are obtained through the simulation and analysis, which can provide theoretical basis for the design and use of double-telescopic props.The method on weld generation in UG environment and the simulation way on welding connection through coupling freedom of nodes in ANSYS are also introduced in this paper,who can provide method and basis for other engineering simulation.