V. B. Poroshin, A. N. Ufimtsev

MAKING A PARAMETER MAP FOR THE INELASTIC CYCLIC DEFORMATION OF COILED TUBING PIPES BY MEANS OF A DIGITAL MODEL OF TEST EQUIPMENT

The accelerated resource testing technique is applied to the digital simulation of bench tests of coiled tubing pipes. Finite element models of the stand and a tube specimen are formed in the Ansys Mechanical package. By calculating the kinetics of the stress-strain state of the specimen, inelastic hysteresis loops for a stabilized cycle are obtained for a number of combinations of operating loads, namely internal pressure, pipeline weight, and the size of the guide device. Status maps are constructed therefrom, relating the parameters of inelastic deformation (alternating plastic flow, ratcheting of strain induced by alternating plastic flow) to loads. The use of the status maps makes possible reasonable planning of real experimental research programs to simulate the required form of coiled tubing failure under operating conditions, and this significantly reduces time, labor, and material costs.

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