Nonlinear finite element buckling analysis of arm stand of dynamic compaction machinery

The arm stand of dynamic compaction machinery is a large space of statically indeterminate truss structure welded by steel pipe. Its stability calculation is always difficult to calculate and design for the arm stand. Use FEA software ANSYS to establish a overall elastic-plastic FEA model of the arm stand of dynamic compaction machinery in working condition. The igenvalue buckling analysis and nonlinear buckling analysis of the arm stand was conducted and the buckling modal and the load-displacement curve of the arm stand was obtained. Nonlinear buckling analysis use arc-length method which is in control of displacement to load the structure of the equilibrium path. The arm stand of dynamic compaction machinery with initial geometric imperfections has been adopted in the analysis. Through the analysis of instability characteristic points´ load-displacement curve, the arm stand of dynamic compaction machinery´s ultimate bearing capacity in working condition is obtained. Model and calculation method used in this paper provide a basis for improved partly of strong tamping machine arm stand.