Abstract

The temperature stability of an element of a thin-walled structure under non-stationary local thermal action, given on one side of the contour, is studied. A two-dimensional finite-element model of a quadrangular plate clamped along one side of the contour is constructed. On the opposite side of the plate contour, there is a heat flow with a movable source simulating the motion of the laser beam in the course of the additive formation of the thin-walled element. Numerical solutions of the non-stationary dynamic heat conduction problem are obtained, spatiotemporal temperature dependences are obtained, and solutions are obtained for the quasistatic problem of the loss of stability of the plane form of the balanced condition of the plate at different points of time due to the appearance of local compressive stresses under intensive heating. Dependences of the critical power of the heat flow corresponding to the loss of stability of the plain form of equilibrium are obtained from the thickness of the plate. The given results can be considered subsequently as the first approximation when researching the possibility of technological deformations of thin-walled elements of the structures made on the basis of additive technologies of Laser Melting class.

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