Stress analysis and stability analysis on doubly-telescopic prop of hydraulic support

•The stress analysis and stability analysis on doubly-telescopic prop are carried out.•The analysis are conducted with axial load and off-center load.•The analysis result shows that the prop design conforms to the design criteria.•By comparing with EN 1804-2-2001, MT313-1992 has a low design requirement.

Based on mixed structured and unstructured finite element mesh, and using the modern CAE technology, the stress analysis and stability analysis on 360-type doubly-telescopic prop are conducted with axial 1.5 times and 2.0 times rating alignment load, off-center 0.3R 1.1 times rating load, based on full range of stroke. The stability analysis on the prop is conducted using the buckling analysis. The result shows that without regard to the dynamic load, the prop can bear 2.0 times axial pressure and 1.1 times off-center 0.3R pressure, and the stress is loaded evenly and the load transmission is reasonable. Except the guide sleeve I and middle cylinder, the safety factor of other parts are all comparatively high and can be used for optimal design. This type of prop will not become unsteady if used under the regulated conditions under Chinese standard MT313-1992 and European standard EN 1804-2-2001, due to its high critical buckling load coefficient of 2.764. The paper can provide theoretical reference to newly proposed relevant technical standard.