The Research On The Vibratory Stress Relief Of Structures’ Residual Stress

For the traditional test method to choose the VSR parameters of high cost and lowefficiency, the VSR parameters are determined by the finite element method. The wholeassembly, and an outer frame, inner frame and the "mirror+inner box" and other parts areused for the research object. the conventional test method for the selection of structuralvibration parameters on aging, as well as residual stress on complex assemblies eliminatemultiple directions the problem of uneven use of X-ray diffraction measurements ofresidual stress distribution in the structure of the actual situation, the use of finite elementsimulation to determine the timeliness parameters, vibration aging treatment, theestablishment of structural components, machine assembly and eliminate stress in thestructure of the optimal minimal structural damage process, and ultimately achieve thepurpose of determining the structure of the optimal parameters of VSR.Firstly, the use of X-ray diffraction structure of the specific circumstances of eachresidual stress distribution were measured and studied. According to the characteristics ofthe selected structure of the material properties and X-ray measurements, using the X-raydiffraction method in the case of the structure of the residual stress were measured.Measured using X-ray machine the size of the residual stress assembly, outside theframework of the inner frame and "mirror+inner box" structure of the selected point.Finite element analysis software ANSYS HYPERMESH and established outside theframework of the inner frame and finite element model "mirror+inner box" structure andconstraint modal analysis. External framework, within the frame and the "mirror+innerbox" structure of harmonic analysis, followed by taking a different excitation frequency andamplitude of the exciting force, calculate the maximum dynamic stress structure and buildthe structure on the basis of maximum dynamic stress simulation results excitationfrequency and amplitude of the exciting force curve. According to the simulation results ofthe mirror and choose "flange+Bracket" structure of the excitation frequency, excitingforce, the excitation point, the anchor and other aging parameters.The statute of limitations on the use of the whole spectrum of harmonic assembly wereresidual stress test stress relief. Due to the complexity of the whole assembly structure,residual stress distribution diversification, traditional VSR stress relief cannot meet demand. Finite element model was established by the whole assembly, to get the natural frequencyof the assembly constraints and mode shapes, select one of the five pairs of key parts of thevibration modes greater impact as the main modes, mixed overlay Shi Zhen, eliminationand homogenizing the residual stress in each direction.Determined in accordance with the finite element method parameter VSR machineparts structure, eliminating the formation of vibration stress test equipment external frame,the inner frame and the "mirror+inner box" structure vibration aging treatment. After themeasurement of residual stress distribution of the test structure, aging analysis results;using orthogonal experiment, outside the framework and the "mirror+inner box" structureas a test object, the aging effect of five different groups of test parameters were analyzed,were VSR optimization of process parameters. To the test results, based on analysis ofdifferent structural test results obtained on the importance of structural materials VSR effectof this conclusion, for further VSR theory provides the basis for analysis.