Experiment device and testing method of uniaxial BREE solution

Abstract

The invention discloses an experiment device and testing method of a uniaxial BREE solution. The experiment device mainly comprises a high temperature creep fatigue testing machine, an upper beam, a lower beam, sample clamps, a first rod sample, a second rod sample, a heating furnace, a high temperature displacement sensor, a temperature controller and a measurement system. The upper beam and the lower beam are fixed to the high temperature creep fatigue testing machine, the two parallel sample clamps are arranged between the upper beam and the lower beam, and the first rod sample and the second rod sample are fixed to the two sample clamps; the first rod sample and the second rod sample are provided with the heating furnace and the high temperature displacement sensor, the temperature controller is connected with the first rod sample and the second rod sample, and the measurement system is connected with the high temperature creep fatigue testing machine. The testing method includes the steps that the high temperature displacement sensor tests displacement deformation of the rod samples, and the relation between plastic stress and the cycle times is obtained, so that the structural stability limit is obtained. The experiment device and testing method can be used for testing and evaluating of the structural stability limit under the condition of uniaxial load and similar working conditions.

Description

technical field [0001] The invention relates to the testing field of uniaxial BREE solutions, in particular to an experimental device and a testing method for uniaxial BREE solutions, and is especially suitable for testing and evaluating stability limits of structures under uniaxial load conditions and similar working conditions. Background technique [0002] Under the combination of mechanical load and alternating thermal load, the component will produce permanent accumulated deformation, this phenomenon is generally called thermal ratchet effect. Thermal ratcheting is one of the common failure modes of components. In recent years, the analysis and design method based on failure mode has been gradually recognized and popularized, and the stability limit design method to limit the ratchet failure is becoming more and more urgent. A long time ago, Bree simplified the thin-walled cylinder into a uniaxial beam model, further explained the deformation mechanism of the thermal r...

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Problems solved by technology

[0007] So far, most of the stability limits of structures under cyclic thermomechanical loads are obtained by numerical simulations, and there is still a lack of effective experimental test research. The classic BREE solution is obtained based on the ideal elastic-plastic theory, so it is conservative and has no Consider the effect of temperature on material properties in practical situations

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