A Fatigue Analysis Method for Boom

Abstract

The invention discloses a boom fatigue analysis method, comprising the following steps: establishing a three-dimensional model of the boom, and establishing a network model of the boom; performing motion simulation on the boom, and obtaining discretized data of position and load at each moment; Select several jib motion data to obtain the static stress analysis cloud image and related data; find the area where the jib stress is too large, and synthesize the stress analysis results to obtain the stress curve in this area; The three-dimensional model of the experiment was carried out, and the stress analysis cloud diagram and stress curve were compared and analyzed; combined with the deformation of the boom, the fatigue life cloud diagram and fatigue life data results of the boom were obtained through fatigue analysis; to judge whether the fatigue strength requirements of the boom were qualified, Propose an optimization plan. The present invention adopts the static analysis technology and utilizes a large number of static analysis to replace the dynamic analysis, so as to complete the stress analysis and fatigue analysis of the boom more quickly and effectively.

Description

Technical field [0001] The present invention relates to a stress analysis method, specifically to a boom fatigue analysis method. Background [0002] When the boom is working with the workpiece load movement and the constantly changing stress, when the boom is subjected to this repeated change of the load, even if the stress value has not exceeded the strength limit of the material, the boom may still have the possibility of failure - this is fatigue failure. Fatigue failure is one of the most common causes of structural failure of the boom, so when designing the boom or optimizing the service life of the boom, the fatigue life of the product needs to be calculated through fatigue analysis to ensure its normal working time. [0003] At present, the commonly used method is to obtain the stress analysis cloud map of the arm according to the maximum external force received by the arm model under standard working conditions as the load, and compare it with the stress obtained by the...

AI Technical Summary

Problems solved by technology

[0004] Since the boom keeps moving for a long time during the actual working process, the position and speed of the boom will change at different times, and the stress results under the action of various factors are significantly different from those obtained by only a single load. Therefore, the calculated stress The result deviates from the actual stress peak area and size

If dynamic analysis is performed on the boom, it is difficult to use dynamic analysis with existing software technology, especially for complex parts, it is difficult to obtain accurate stress results, and at the same time, there are constraints and grid models in the calculation. High requirements, and it is difficult to obtain convergent stress analysis results, it takes a lot of time for inspection and calibration, which is not conducive to subsequent fatigue analysis and optimization of boom design

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