Method for forecasting ultimate bearing capacity of automobile semi-axle

Abstract

The invention relates to the technical field of automobile research, development and manufacturing, and particularly discloses a method for forecasting the ultimate bearing capacity of an automobile semi-axle. According to the method for forecasting the ultimate bearing capacity of the automobile semi-axle, the static torsion test state of an automobile semi-axle sample piece is truly represented by building a material nonlinear and contact nonlinear CAE simulation model of a full-size structure on the basis of the real heat treatment state of the automobile semi-axle, and the prediction accuracy of the ultimate bearing capacity of the automobile semi-axle is improved. The limit bearing torque of the semi-axle is predicted by obtaining the high-precision relation curve of the rotation angle of the semi-axle and the torque load, the method for predicting the limit bearing torque of the semi-axle of the automobile with high speed and high precision is provided, an automobile semi-axle static torsion test is replaced, and the product development cost is reduced; and the adaptability is high, the application range is wide, and the simulation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of automobile R&D and manufacturing, in particular to a method for predicting the ultimate bearing capacity of an automobile half shaft. Background technique [0002] The axle shaft of an automobile is a key part that transmits power from the axle shaft gear of the differential to the driving wheels. Fracture failure of the axle shaft will often cause serious injury. The ultimate load-carrying capacity of an automobile half shaft is the ability to bear the maximum load when the half shaft breaks and fails. As an important basic component and force transmission part of the transmission system, the half shaft of the automobile should not only transmit the normal use torque, but also limit the excessive load of the abnormal use. If the transmission system encounters an excessive impact load, the first The damaged part should be the half shaft instead of other transmission system parts, so as to protect the tra...

AI Technical Summary

Problems solved by technology

On this basis, assuming that the stress or static safety factor has a linear relationship with the applied load, according to the threshold requirement, the ultimate bearing load when the structure breaks is approximately calculated, which has the following problems; ① There are many forms of stress, such as Mises stress , maximum principal stress, etc., and it also has various states such as tension, bending, and torsion; there are also various types of material strength, such as tensile strength, compressive strength, and bending strength, etc., which stress and which material strength are used for the limit The calculation of bearing torque is highly subjective, so that the calculation of ultimate bearing load varies widely, and the accuracy is low, which cannot meet the needs of product development

② Static safety factor evaluation comprehensively considers the impact of structural stress type, stress state and material strength corresponding to different stress states, etc., to a certain extent avoids human subjectivity, but practice shows that the calculated ultimate bearing torque is much lower than the test value , relatively conservative, resulting in excessive semi-axis strength backup coefficient, heavy quality, high cost, etc., seriously affecting product competitiveness

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